Merge remote-tracking branch 'origin/feat/directory-picker-quiet-navigation' into feat/dir-selector-adaptive-default

# Conflicts:
#	.agents/notes/implemented/architecture/2026-07-28-directory-picker-capability-seam.i18n.yaml

.agents/notes/implemented/architecture/2026-07-10-single-file-executable-sdk-runtime-distribution.i18n.yaml

@@ -1,6 +1,6 @@
 # Bilingual-pair consistency record (docs/i18n/README.md): the git blob hash of each
 # side as of the last confirmed-consistent state. Both languages carry equal authority;
 # after editing either side, bring the other along and re-record with:
-#   pnpm run verify-translation-pairing --write
-2026-07-10-single-file-executable-sdk-runtime-distribution.md: 39cfb2999dea7767a18702ad7d160c9e88d7bf20
-2026-07-10-single-file-executable-sdk-runtime-distribution.zh.md: e1a21c40647e1418d4afd02c0bc6b44ef0d4a8cf
+#   pnpm run verify-translation-pairing --write .agents/notes/implemented/architecture/2026-07-10-single-file-executable-sdk-runtime-distribution.md
+2026-07-10-single-file-executable-sdk-runtime-distribution.md: f749d6a72b4c32a189a9f848595076457819d9b9
+2026-07-10-single-file-executable-sdk-runtime-distribution.zh.md: 2b511573bc68e5378279cec8d22ce960af0966e9

.agents/notes/implemented/architecture/2026-07-10-single-file-executable-sdk-runtime-distribution.md

@@ -40,15 +40,15 @@ The deploy root is [`python/sdk-runtime/package.json`](../../../../python/sdk-ru
 
 ### Build pipeline and artifacts
 
-[`scripts/build-exe-for-python-sdk.ts`](../../../../scripts/build-exe-for-python-sdk.ts): runtime closure verification → `pnpm run build` → (after clearing) `pnpm --filter dsh-jsonrpc-agent-pkg deploy --legacy --prod --config.node-linker=hoisted --config.auto-install-peers=false --config.link-workspace-packages=true` **directly into** `python/sdk-runtime/src/deepseek_harness_runtime/runtime/node/` → inject the pkg configuration (`bin` points at `node_modules/@deepseek-ai/dsh-jsonrpc-demo/lib/bin.js` inside the closure, `assets` is a full glob — dynamic import is invisible to pkg's static analysis, so everything must be packed in explicitly) → one `pkg --sea` per target → the executables `dsh-jsonrpc-agent-pkg-<platform>-<arch>` land in `dist-exe/` and are copied back into the runtime directory. CI treats them as intermediate test inputs and retains their platform wheels. All four deploy flags are grounded in measurement: `--legacy` is the mandatory path with inject-workspace-packages off; hoisted yields a zero-symlink file tree (most stable for the pkg VFS, physically guaranteeing a single cordis instance); disabling automatic peer installation keeps unpublished package names from triggering registry resolution; link-workspace-packages points the closure at workspace/vendor sources.
+[`scripts/build-exe-for-python-sdk.ts`](../../../../scripts/build-exe-for-python-sdk.ts): runtime closure verification → `pnpm run build` → (after clearing) `pnpm --filter dsh-jsonrpc-agent-pkg deploy --legacy --prod --config.node-linker=hoisted --config.auto-install-peers=false --config.link-workspace-packages=true` **directly into** `python/sdk-runtime/src/deepseek_harness_runtime/runtime/node/` → inject the pkg configuration (`bin` points at `node_modules/@deepseek-ai/dsh-jsonrpc-demo/lib/bin.js` inside the closure, `assets` is a full glob — dynamic import is invisible to pkg's static analysis, so everything must be packed in explicitly) → stage the target `node-pty` addon → one `pkg --sea` per target → the executables `dsh-jsonrpc-agent-pkg-<platform>-<arch>` land in `dist-exe/` and are copied back into the runtime directory. Linux installs build `pty.node` from source, so the builder copies it from the root install into the staged closure because legacy deploy omits that side-effect directory; macOS uses its target prebuild and emits the required `-spawn-helper` beside the executable. CI treats these products as intermediate test inputs and retains their platform wheels. All four deploy flags are grounded in measurement: `--legacy` is the mandatory path with inject-workspace-packages off; hoisted yields a zero-symlink file tree (most stable for the pkg VFS, physically guaranteeing a single cordis instance); disabling automatic peer installation keeps unpublished package names from triggering registry resolution; link-workspace-packages points the closure at workspace/vendor sources.
 
 CI: [`.github/workflows/build-exe-for-python-sdk.yml`](../../../../.github/workflows/build-exe-for-python-sdk.yml), triggered explicitly only — `workflow_dispatch`, or the `build-exe` label on a pull request; native builds on the three platforms linux-x64 / linux-arm64 (`ubuntu-24.04-arm`) / macos-arm64, with `~/.pkg-cache` cached; macOS ad-hoc signing is handled by pkg. Each leg drives a mock SSE model through the SDK with the default config and a custom `cordis.yml`, drives the exe directly over NDJSON JSON-RPC, verifies the JSONL and final response, and installs release-shaped wheels into a clean venv without `runtime_bin`; Linux additionally inspects GLIBC requirements and runs in a manylinux 2.28 container. A full three-target run retains four artifacts, each containing one release file: the platform-independent SDK wheel and three native runtime wheels; a subset dispatch retains the SDK wheel and selected runtime wheels. Bare executables and source bundles remain intermediate test inputs. [`.gitlab-ci.yml`](../../../../.gitlab-ci.yml) accepts only `python-vX.Y.Z` tag pipelines whose version matches the root `package.json`, builds one SDK wheel and three native runtime wheels, then a single serialized job checks and publishes all four to the project PyPI registry. Windows is a non-goal.
 
 ### Python SDK distribution: two carriers, exe for production, node for development
 
-The Python SDK lives at [`python/`](../../../../python/README.md): `python/sdk` (the client) + `python/sdk-runtime` (the runtime carrier package). The runtime package's data directory holds three kinds of content: the checked-in default `runtime/cordis.yml`, the build-injected platform exe, and the build-injected `runtime/node/` closure tree. `resolve_bundled_launch_args()` automatic resolution **finds the exe only**; the node carrier is enabled only by an explicit `DSH_RUNTIME_MODE=node` (running `runtime/node/node_modules/@deepseek-ai/dsh-jsonrpc-demo/lib/bin.js`, requiring a system node ≥22.19), positioned as the development-verification channel for members of this repo, and does not enter wheel distributions.
+The Python SDK lives at [`python/`](../../../../python/README.md): `python/sdk` (the client) + `python/sdk-runtime` (the runtime carrier package). The runtime package's data directory holds the checked-in default `runtime/cordis.yml`, the build-injected platform exe and optional helper, and the build-injected `runtime/node/` closure tree. `resolve_bundled_launch_args()` automatic resolution **finds the exe only**; the node carrier is enabled only by an explicit `DSH_RUNTIME_MODE=node` (running `runtime/node/node_modules/@deepseek-ai/dsh-jsonrpc-demo/lib/bin.js`, requiring a system node ≥22.19), positioned as the development-verification channel for members of this repo, and does not enter wheel distributions.
 
-[`scripts/build-python-release.py`](../../../../scripts/build-python-release.py) reads the authoritative stable `X.Y.Z` from the repository root `package.json` and stages both packages at that version, with the SDK depending exactly on `deepseek-harness-runtime-bin==X.Y.Z`. An optional `python-vX.Y.Z` release tag is a consistency assertion and is rejected when it differs from the repository version; the source `pyproject.toml` development sentinel never determines a release version. The SDK is a `py3-none-any` wheel; the wheel-only runtime package contains exactly one exe and uses one of `py3-none-manylinux_2_28_x86_64`, `py3-none-manylinux_2_28_aarch64`, or `py3-none-macosx_11_0_arm64`. Its Hatch hook rejects sdists, universal tags, mixed executable payloads, and unsupported platforms.
+[`scripts/build-python-release.py`](../../../../scripts/build-python-release.py) reads the authoritative stable `X.Y.Z` from the repository root `package.json` and stages both packages at that version, with the SDK depending exactly on `deepseek-harness-runtime-bin==X.Y.Z`. An optional `python-vX.Y.Z` release tag is a consistency assertion and is rejected when it differs from the repository version; the source `pyproject.toml` development sentinel never determines a release version. The SDK is a `py3-none-any` wheel; each wheel-only runtime package contains one exe, and the macOS wheel also contains its architecture-matched helper. Runtime wheels use one of `py3-none-manylinux_2_28_x86_64`, `py3-none-manylinux_2_28_aarch64`, or `py3-none-macosx_11_0_arm64`; the Hatch hook rejects sdists, universal tags, mixed-platform payloads, missing or extra helpers, and unsupported platforms.
 
 The exe's "must be explicitly configured" hard semantic is unchanged; the zero-config experience is restored by the wrapper: when the caller gave no `cordis`, named no explicit runtime, and the environment has no `DSH_CORDIS_CONFIG`, the client explicitly injects the checked-in default `cordis.yml` (agent-core + preloaded llm-deepseek + JSONL persistence + bash-local + the `dsh-jsonrpc` serving entry, with `!!js` environment-variable fallbacks) via `DSH_CORDIS_CONFIG`.
 
@@ -62,7 +62,7 @@ The exe's "must be explicitly configured" hard semantic is unchanged; the zero-c
 
 ## Testing
 
-The verification surface has three tiers. Mechanism tier: the measured conclusions for the `--sea` chain are embedded in the Decision sections (ESM dynamic import inside the VFS, single cordis instance, fail-loud config chain, `node:sqlite`, macOS ad-hoc signing runs). SDK tier: the complete keyless pytest suite covers the client protocol against a fake runtime peer, subprocess cleanup, absolute cwd propagation, dual-carrier launch, and carrier resolution; root CI runs it on Python 3.10. End-to-end tier: every platform build completes a turn against a mock endpoint through the default SDK path, a custom config, and the direct binary protocol, with final text and JSONL checked. The custom config additionally drives `run_code` and a zero-agent `workflow` through their real worker files inside the packaged VFS. The same build leg runs a committed executable-specific snapshot through the Python SDK: a keyless scripted model mounts a Cordis plugin that registers a tool, invokes that tool from `run_code`, runs a direct spawn subagent and a workflow that starts a second spawn child, then unmounts the plugin. The comparison normalizes the SDK result and notification stream plus the parent and two child JSONL logs. This harness stays separate from ACP's `pnpm run test:snapshot` because the protocols and build artifacts differ. The platform wheel is then installed in a clean venv and run without `runtime_bin`.
+The verification surface has three tiers. Mechanism tier: the measured conclusions for the `--sea` chain are embedded in the Decision sections (ESM dynamic import inside the VFS, single cordis instance, fail-loud config chain, `node:sqlite`, macOS ad-hoc signing runs). SDK tier: the complete keyless pytest suite covers the client protocol against a fake runtime peer, subprocess cleanup, absolute cwd propagation, dual-carrier launch, and carrier resolution; root CI runs it on Python 3.10. End-to-end tier: every platform build completes a turn against a mock endpoint through the default SDK path, a custom config, and the direct binary protocol, with final text and JSONL checked. The custom config additionally drives `run_code` and a zero-agent `workflow` through their real worker files inside the packaged VFS. The same build leg runs a committed executable-specific snapshot through the Python SDK: a keyless scripted model mounts a Cordis plugin that registers a tool, invokes that tool from `run_code`, runs a direct spawn subagent and a workflow that starts a second spawn child, then unmounts the plugin. The fixture explicitly disables its unused bundled Bash and local skill discovery so its tool set does not depend on repository-external state, and the comparison normalizes opaque message IDs in the SDK result and notification stream plus the parent and two child JSONL logs. This harness stays separate from ACP's `pnpm run test:snapshot` because the protocols and build artifacts differ. The platform wheel is then installed in a clean venv and run without `runtime_bin`.
 
 Manual-driving caveat: the bin treats stdin EOF as "the client is gone" and disposes immediately, so a short-lived pipe aborts an in-flight turn — pipe-driven runs must keep stdin open until the turn ends.
 

.agents/notes/implemented/architecture/2026-07-10-single-file-executable-sdk-runtime-distribution.zh.md

@@ -40,15 +40,15 @@ exe 的 VFS 内是**构建产物形态的真实包树**（各包的 `lib/` + 真
 
 ### 构建管线与产物
 
-[`scripts/build-exe-for-python-sdk.ts`](../../../../scripts/build-exe-for-python-sdk.ts)：运行时闭包校验 → `pnpm run build` →（清空后）`pnpm --filter dsh-jsonrpc-agent-pkg deploy --legacy --prod --config.node-linker=hoisted --config.auto-install-peers=false --config.link-workspace-packages=true` **直接写入** `python/sdk-runtime/src/deepseek_harness_runtime/runtime/node/` → 注入 pkg 配置（`bin` 指向闭包内的 `node_modules/@deepseek-ai/dsh-jsonrpc-demo/lib/bin.js`；`assets` 使用全量 glob，因为动态 `import()` 对 pkg 静态分析不可见，必须显式打入全部内容）→ 每个构建目标调用一次 `pkg --sea` → 可执行文件 `dsh-jsonrpc-agent-pkg-<platform>-<arch>` 写入 `dist-exe/`，并拷回运行时目录。CI 将这些文件作为测试中间输入，只保留对应平台的 wheel 包。四个部署标志都有实测依据：未启用 `inject-workspace-packages` 时必须使用 `--legacy`；`hoisted` 产出无符号链接的文件树（对 pkg VFS 最稳定，并从物理上保证只有一个 Cordis 实例）；关闭对等依赖自动安装可避免未发布包名触发注册表解析；`link-workspace-packages` 让闭包指向工作区/vendor 源码。
+[`scripts/build-exe-for-python-sdk.ts`](../../../../scripts/build-exe-for-python-sdk.ts)：运行时闭包校验 → `pnpm run build` →（清空后）`pnpm --filter dsh-jsonrpc-agent-pkg deploy --legacy --prod --config.node-linker=hoisted --config.auto-install-peers=false --config.link-workspace-packages=true` **直接写入** `python/sdk-runtime/src/deepseek_harness_runtime/runtime/node/` → 注入 pkg 配置（`bin` 指向闭包内的 `node_modules/@deepseek-ai/dsh-jsonrpc-demo/lib/bin.js`；`assets` 使用全量 glob，因为动态 `import()` 对 pkg 静态分析不可见，必须显式打入全部内容）→ 暂存目标平台的 `node-pty` addon → 每个构建目标调用一次 `pkg --sea` → 可执行文件 `dsh-jsonrpc-agent-pkg-<platform>-<arch>` 写入 `dist-exe/`，并拷回运行时目录。Linux 安装会从源码构建 `pty.node`，而 `--legacy` 部署会省略该副作用目录，因此构建器会把它从根安装目录复制到暂存闭包；macOS 使用对应目标的预构建产物，并在可执行文件旁生成所需的 `-spawn-helper`。CI 将这些产物作为测试中间输入，只保留对应平台的 wheel 包。四个部署标志都有实测依据：未启用 `inject-workspace-packages` 时必须使用 `--legacy`；`hoisted` 产出无符号链接的文件树（对 pkg VFS 最稳定，并从物理上保证只有一个 Cordis 实例）；关闭对等依赖自动安装可避免未发布包名触发注册表解析；`link-workspace-packages` 让闭包指向工作区/vendor 源码。
 
 CI 使用 [`.github/workflows/build-exe-for-python-sdk.yml`](../../../../.github/workflows/build-exe-for-python-sdk.yml)，且只允许显式触发：手动派发 `workflow_dispatch`，或给 PR 添加 `build-exe` 标签。linux-x64、linux-arm64（`ubuntu-24.04-arm`）和 macos-arm64 三个平台分别进行原生构建，并缓存 `~/.pkg-cache`；macOS 的 ad-hoc 签名由 pkg 处理。每个平台都使用模拟 SSE 模型，分别通过默认配置和自定义 `cordis.yml` 驱动 SDK，再通过 NDJSON JSON-RPC 直接驱动 exe，校验 JSONL 与最终响应；最后把发布形态的 wheel 包安装到干净的 venv 中，并在不传 `runtime_bin` 的情况下运行。Linux 还会检查 GLIBC 依赖，并在 manylinux 2.28 容器中运行。完整构建三个目标时保留 4 个产物，每个产物只含一个发布文件：平台无关的 SDK wheel 包与 3 个原生运行时 wheel 包；手动选择部分目标时保留 SDK wheel 与所选运行时 wheel。裸 exe 与源码包只作为测试中间输入。[`.gitlab-ci.yml`](../../../../.gitlab-ci.yml) 只接受版本与根目录 `package.json` 匹配的 `python-vX.Y.Z` 标签流水线，构建一个 SDK wheel 包和 3 个原生运行时 wheel 包，再由单个串行任务校验并将这 4 个文件发布到项目的 PyPI 注册表。Windows 不在目标范围内。
 
 ### Python SDK 分发：双载体，exe 用于生产，`node` 用于开发
 
-Python SDK 位于 [`python/`](../../../../python/README.md)：`python/sdk` 是客户端，`python/sdk-runtime` 是运行时载体包。运行时包的数据目录包含三类内容：检入的默认 `runtime/cordis.yml`、构建注入的平台 exe，以及构建注入的 `runtime/node/` 闭包树。`resolve_bundled_launch_args()` 的自动解析**只查找 exe**；`node` 载体仅在显式设置 `DSH_RUNTIME_MODE=node` 时启用（运行 `runtime/node/node_modules/@deepseek-ai/dsh-jsonrpc-demo/lib/bin.js`，需要系统 Node ≥22.19），定位为本仓库成员的开发验证通道，不随 wheel 包分发。
+Python SDK 位于 [`python/`](../../../../python/README.md)：`python/sdk` 是客户端，`python/sdk-runtime` 是运行时载体包。运行时包的数据目录包含检入的默认 `runtime/cordis.yml`、构建注入的平台 exe 与可选 helper，以及构建注入的 `runtime/node/` 闭包树。`resolve_bundled_launch_args()` 的自动解析**只查找 exe**；`node` 载体仅在显式设置 `DSH_RUNTIME_MODE=node` 时启用（运行 `runtime/node/node_modules/@deepseek-ai/dsh-jsonrpc-demo/lib/bin.js`，需要系统 Node ≥22.19），定位为本仓库成员的开发验证通道，不随 wheel 包分发。
 
-[`scripts/build-python-release.py`](../../../../scripts/build-python-release.py) 从仓库根目录的 `package.json` 读取权威的稳定版本 `X.Y.Z`，以该版本暂存两个包，并让 SDK 精确依赖 `deepseek-harness-runtime-bin==X.Y.Z`。可选的 `python-vX.Y.Z` 发布标签只是一项一致性断言，与仓库版本不同时会被拒绝；源码 `pyproject.toml` 中的开发占位版本从不决定发布版本。SDK 是 `py3-none-any` wheel 包；只提供 wheel 包的运行时包恰好包含一个 exe，标签为 `py3-none-manylinux_2_28_x86_64`、`py3-none-manylinux_2_28_aarch64` 或 `py3-none-macosx_11_0_arm64`。其 Hatch 钩子拒绝 sdist、通用标签、混合可执行载荷以及不支持的平台。
+[`scripts/build-python-release.py`](../../../../scripts/build-python-release.py) 从仓库根目录的 `package.json` 读取权威的稳定版本 `X.Y.Z`，以该版本暂存两个包，并让 SDK 精确依赖 `deepseek-harness-runtime-bin==X.Y.Z`。可选的 `python-vX.Y.Z` 发布标签只是一项一致性断言，与仓库版本不同时会被拒绝；源码 `pyproject.toml` 中的开发占位版本从不决定发布版本。SDK 是 `py3-none-any` wheel 包；每个只提供 wheel 包的运行时包都包含一个 exe，macOS wheel 包还包含与其架构匹配的 helper。运行时 wheel 包使用 `py3-none-manylinux_2_28_x86_64`、`py3-none-manylinux_2_28_aarch64` 或 `py3-none-macosx_11_0_arm64` 三种标签之一；Hatch 钩子拒绝 sdist、通用标签、混合平台载荷、helper 缺失或多余，以及不支持的平台。
 
 exe“必须显式配置”的硬语义不变；零配置体验由包装层恢复：调用方没有提供 `cordis`、没有显式指定运行时，且环境中没有 `DSH_CORDIS_CONFIG` 时，客户端将检入的默认 `cordis.yml`（`agent-core` + 预载的 `llm-deepseek` + JSONL 持久化 + `bash-local` + `dsh-jsonrpc` 对外服务条目，并通过 `!!js` 使用环境变量兜底）显式注入 `DSH_CORDIS_CONFIG`。
 
@@ -62,7 +62,7 @@ exe 内支持 `dsh-workflow-workerthread` 与 `dsh-code-runtime-worker`。两个
 
 ## 测试
 
-验证面分三层。机制层：`--sea` 链路的实测结论内嵌在“决策”各节（VFS 内 ESM 动态 `import()`、单一 Cordis 实例、明确报错的配置链路、`node:sqlite`、macOS ad-hoc 签名可运行）。SDK 层：完整的无密钥 pytest 套件以假运行时对端覆盖客户端协议、子进程清理、绝对 `cwd` 传递、双载体启动与载体解析；根 CI 在 Python 3.10 上运行全部用例。端到端层：每个平台构建都通过默认 SDK 路径、自定义配置和直接二进制协议，对模拟端点完成一个轮次，并校验最终文本与 JSONL。自定义配置还会通过打包进 VFS 的真实工作线程文件执行 `run_code` 和不启动 agent 的 `workflow`。同一构建任务还会经 Python SDK 运行一组检入的 exe 专用快照：无密钥脚本化模型挂载一个会注册工具的 Cordis 插件，从 `run_code` 调用该工具，运行一个由 spawn 提供方直接启动的 subagent（子 agent）和一个会通过 spawn 启动第二个子 agent 的工作流，随后卸载该插件。比较时会规范化 SDK 结果与通知流，以及父会话和两个子会话的 JSONL 日志。该 harness 与 ACP 的 `pnpm run test:snapshot` 保持独立，因为二者的协议和构建产物不同。随后把平台 wheel 包安装进干净的 venv，并在不传 `runtime_bin` 的情况下运行。
+验证面分三层。机制层：`--sea` 链路的实测结论内嵌在“决策”各节（VFS 内 ESM 动态 `import()`、单一 Cordis 实例、明确报错的配置链路、`node:sqlite`、macOS ad-hoc 签名可运行）。SDK 层：完整的无密钥 pytest 套件以假运行时对端覆盖客户端协议、子进程清理、绝对 `cwd` 传递、双载体启动与载体解析；根 CI 在 Python 3.10 上运行全部用例。端到端层：每个平台构建都通过默认 SDK 路径、自定义配置和直接二进制协议，对模拟端点完成一个轮次，并校验最终文本与 JSONL。自定义配置还会通过打包进 VFS 的真实工作线程文件执行 `run_code` 和不启动 agent 的 `workflow`。同一构建任务还会经 Python SDK 运行一组检入的 exe 专用快照：无密钥脚本化模型挂载一个会注册工具的 Cordis 插件，从 `run_code` 调用该工具，运行一个由 spawn 提供方直接启动的 subagent（子 agent）和一个会通过 spawn 启动第二个子 agent 的工作流，随后卸载该插件。该 fixture（测试前置数据）会显式禁用组合包中未使用的 Bash 和本地 skill（技能）发现，使其工具集不依赖仓库外部状态；比较时会规范化以下各处的不透明消息 ID：SDK 结果与通知流，以及父会话和两个子会话的 JSONL 日志。该 harness 与 ACP 的 `pnpm run test:snapshot` 保持独立，因为二者的协议和构建产物不同。随后把平台 wheel 包安装进干净的 venv，并在不传 `runtime_bin` 的情况下运行。
 
 手工驱动注意：`bin` 将 stdin EOF 视为“客户端已离开”并立即 dispose，短命管道会中止进行中的轮次——管道驱动必须保持 stdin 打开，直到轮次结束。
 

.agents/notes/implemented/architecture/2026-07-28-directory-picker-capability-seam.i18n.yaml

@@ -2,5 +2,5 @@
 # side as of the last confirmed-consistent state. Both languages carry equal authority;
 # after editing either side, bring the other along and re-record with:
 #   pnpm run verify-translation-pairing --write .agents/notes/implemented/architecture/2026-07-28-directory-picker-capability-seam.md
-2026-07-28-directory-picker-capability-seam.md: c44717d46445a992e563497ed011930a6044a1bb
-2026-07-28-directory-picker-capability-seam.zh.md: 42fedf64ba97fed032c4847b68ce321ae32dc463
+2026-07-28-directory-picker-capability-seam.md: 495062f910785e1bb2f421dbb25c01c399d45567
+2026-07-28-directory-picker-capability-seam.zh.md: 62fc87212ab627ea8819dab55e3a769b4a5afc42

.agents/notes/implemented/architecture/2026-07-28-directory-picker-capability-seam.md

@@ -18,7 +18,9 @@ Placement and policy rulings folded into this decision:
 
 - **Not the `ctx.fs` seam.** `packages/fs/` is the model/session-facing storage stack (policy events, sandbox-swappable backends). Riding it would couple GUI browsing to the model's confinement backend — swapping `fs-sandbox` for the model must never change GUI behavior — and OS facts (home anchoring, hidden conventions) are not storage primitives. The picker seam stays presentation-free and model-free; `packages/host/` is its consumer-domain home.
 - **Dependency survey (hand-roll vs adopt).** Node's stdlib *is* the maintained cross-platform OS layer (`readdir(withFileTypes)`, `homedir`, path semantics); surveyed alternatives fail the dependency bar — file-manager packages (`node-file-manager`, `files-and-folders`, Syncfusion's provider) are whole HTTP apps (fit), drive-letter helpers (`drivelist` native addon, `windows-drive-letters` ~7y stale) fail health/proportionality. The browse backend is a thin adapter over stdlib.
-- **Hidden entries: return-and-flag.** The host stamps `hidden` (POSIX dot convention) and returns everything; the client filters. Display policy stays client-side, and the planned show-hidden toggle becomes a client-only change. Windows' `FILE_ATTRIBUTE_HIDDEN` is not exposed by dirents — documented limitation until a native probe pays for itself.
+- **Hidden entries: return-and-flag.** The host stamps `hidden` (POSIX dot convention) and returns everything; the client filters. Display policy stays client-side, and the show-hidden toggle shipped as exactly that client-only change: a fixed-label footer toggle whose state lives in the pressed presentation (`aria-pressed` + check glyph), a dot-led path-draft prefix reveals the hidden entries it names, and the current selection is exempt from both the hidden and the prefix filter (it anchors the two-pane view). Windows' `FILE_ATTRIBUTE_HIDDEN` is not exposed by dirents — documented limitation until a native probe pays for itself.
+- **Path-editor cancel scope: the dialog card.** The browse client's path editor cancels on Escape and on focus leaving the card, both observed at a card-scope wrapper rather than the input — after Tab parks focus on a filtered row the input is off the event path, yet Escape must collapse the editor (not the dialog) and a later focus departure must still cancel. Non-cancel exemptions: window/tab focus loss, in-card focus moves, and pointer paths (rows and the toggle suppress focus steal on mousedown while editing). Separators for seeding and draft-tail filtering are inferred from `listing.home`; the wire-field alternative below records the deferred authoritative form. Combobox semantics between the editor and the list it filters (`aria-expanded`/`aria-controls`/active-descendant, result announcements) are likewise deferred — today they read to assistive tech as separate widgets.
+- **Navigation lands selection-anchored, quiet, and bounded.** Away from the display root (the same collapse the crumb header renders, so crumbs and pane shape never disagree), the landing is two-pane: the target's actual parent-level entry re-selected (platform case folding on Windows), its children on the right, so a crumb jump reads as stepping back one pane rather than collapsing to a single column. Target and parent legs land as **one frame** when the parent leg settles within the 200ms wait bound — the stale view keeps rendering until then, so navigation swaps the panes without an intermediate single-pane flash — and past the bound the target commits alone at once (an Enter-submitted navigation is never held hostage by a stalled parent) with the late parent leg upgrading the landing in place. The parent leg runs under the landing's supersession scope and is aborted on the wire by any newer intent (Escape inside the landing window therefore withdraws the whole navigation); a failed parent leg, or a truncated parent window lacking the target, leaves the single-pane landing — the upgrade must never orphan the selection it exists to anchor. The loading indicator follows the same quiet rule: it floats over the content's bottom-right corner (never a layout-shifting row; the truncated/error rows own the bottom left and keep rendering through a scan) and only once a scan outlives a 300ms silence window, so a local listing swaps with nothing shown at all. Row picks are deliberately exempt from the one-frame rule: a pick's immediate pane split is its selected-state feedback (aria-current, crumbs following), while a navigation has nothing to acknowledge the click but the swap itself. Both timing constants are calibrated for local enumeration; a remote deployment (one RPC per level, commonly 100–400ms) would sit inside the silence window with no pressed state on the crumbs — revisit the window or add pressed feedback when a remote consumer lands.
 - **Symlinks: follow for enterability.** `stat` probes symlinks (broken/cyclic → skipped); crumbs keep the logical path the operator navigated, and `workspace.create` already canonicalizes via realpath at adoption.
 - **Listing levels are bounded, and streamed.** One `list` call returns at most `maxEntries` rows (config, default 1000 — GitHub's web-UI directory-listing bound). The level streams via `opendir` into a name-sorted window of `maxEntries + 1` candidates, so memory stays O(maxEntries) and enterability probing touches only windowed candidates; the wire `DirectoryListing` carries a required `truncated` flag so the client states incompleteness instead of silently missing tail entries. A windowed broken symlink is not backfilled from beyond the window — the eviction already marks the level truncated. Window insertion is binary with an O(1) full-window tail rejection (an oversized level must not pay a window scan per dirent), and `list(path, signal)` threads the carrier's request signal so a scan of a stalled network directory cannot outlive a disconnected caller — every await in the scan (open, each read, each symlink probe) races the signal, an aborted exit abandons rather than awaits the close (Node queues close behind in-flight reads), and abandoned settlements are swallowed so cleanup can never surface as an unhandled rejection. An unbounded level is a memory/responsiveness hole for large or adversarial directories.
 - **Whole-filesystem scope, no roots config.** `workspace.create` accepts arbitrary paths and the API serves bash-driving methods, so a browse root would be UX scoping, not a boundary; configurability without a consumer fails the evidence bar. Deferred until a deployment needs it.
@@ -30,6 +32,9 @@ Placement and policy rulings folded into this decision:
 - **One uniform seam method set (`pick(): path`).** Rejected: an in-app browser cannot be served behind a single host-side call — the browsing loop lives in the client and needs primitives on the wire; the native chooser cannot implement primitives. The interaction difference is irreducible, hence the discriminant.
 - **Direct stdlib calls inside apiproxy (no seam).** Rejected: keeps the gateway the only swap point (source edits), loses fixture/test backends, and contradicts the plugin doctrine that motivated the work.
 - **Adopting a file-manager/drive-enumeration dependency.** Rejected per the survey above; recorded here as the dependency policy requires.
+- **A flip-label show-hidden toggle ("Hide hidden files").** Rejected: a flipping action label is ambiguous between state and action and doubles the negative; the fixed label with a pressed presentation states both at once.
+- **Pure relatedTarget blur cancellation (no mousedown suppression).** Rejected: Safari does not focus buttons on pointer down, so a click's focusout carries a null `relatedTarget` and would cancel the editor before the click lands; editing-scoped mousedown suppression plus the card-anchored relatedTarget guard covers pointer and keyboard paths together.
+- **A wire `separator` field on `DirectoryListing` (host stamps `path.sep`).** Deferred, not rejected: it is the authoritative form — a POSIX home directory containing a backslash defeats the `listing.home` heuristic — but it touches the seam type and every backend; the browse client's `separatorOf` carries a TODO pointing at this alternative until a wire change is next scheduled.
 
 ## Consequences
 

.agents/notes/implemented/architecture/2026-07-28-directory-picker-capability-seam.zh.md

@@ -18,7 +18,9 @@ web GUI 的"打开本地文件夹"流程被焊死在一种交互上：`host.pick
 
 - **不用 `ctx.fs` seam。** `packages/fs/` 是面向模型／会话的存储栈（policy 事件、sandbox 可换后端）。骑上去会把 GUI 浏览耦合进模型的限制后端——为模型换 `fs-sandbox` 绝不能改变 GUI 行为——而 OS 事实（home 锚定、隐藏约定）也不是存储原语。picker seam 保持无展示、无模型；`packages/host/` 是它消费方域的家。
 - **依赖调研（手写 vs 引入）。** Node 标准库本身就是维护中的跨平台 OS 层（`readdir(withFileTypes)`、`homedir`、路径语义）；调研过的替代品都过不了依赖门槛——文件管理器包（`node-file-manager`、`files-and-folders`、Syncfusion 的 provider）是整套 HTTP 应用（契合度不过），盘符工具（原生插件 `drivelist`、约七年未更的 `windows-drive-letters`）健康度／比例失当。browse 后端是标准库上的薄适配。
-- **隐藏条目：返回并打标。** 宿主标注 `hidden`（POSIX 点前缀约定）并返回全部条目；客户端过滤。展示策略留在客户端，计划中的"显示隐藏"开关变成纯客户端改动。Windows 的 `FILE_ATTRIBUTE_HIDDEN` 不被 dirent 暴露——记为限制，直到原生探测值回其成本。
+- **隐藏条目：返回并打标。** 宿主标注 `hidden`（POSIX 点前缀约定）并返回全部条目；客户端过滤。展示策略留在客户端，"显示隐藏"开关正是作为这一纯客户端改动落地：标签固定的 footer 开关，其状态由按下态呈现承载（`aria-pressed` + 勾选符号）；以点开头的路径草稿前缀会显出它所指名的隐藏条目；当前选中项则不受隐藏与前缀两种过滤影响（它锚定着双栏视图）。Windows 的 `FILE_ATTRIBUTE_HIDDEN` 不被 dirent 暴露——记为限制，直到原生探测值回其成本。
+- **路径编辑器的取消范围：对话框卡片。** browse 客户端的路径编辑器在按 Escape 与焦点离开卡片时取消，两者都在卡片范围的包装层而非输入框上监听——Tab 把焦点停到某个过滤命中的行之后，输入框已不在事件路径上，但 Escape 仍须收起编辑器（而非对话框），其后的焦点离开也仍须取消。不取消的豁免：窗口／标签页失焦、卡片内焦点移动，以及指针路径（编辑期间行与开关在 mousedown 时抑制焦点夺取）。预填与草稿末段过滤所用的分隔符从 `listing.home` 推断；下文的线上字段替代方案记录了被延期的权威形态。编辑器与其过滤的列表之间的 combobox 语义（`aria-expanded`／`aria-controls`／active-descendant、结果播报）同样被延期——目前二者在辅助技术看来是彼此独立的控件。
+- **导航以选中项为锚、安静且有界地落地。** 在展示根之外（与 crumb 头部渲染的是同一塌缩，因此 crumb 与分栏形态永不相左），落地即双栏：重新选中目标在父层级中的实际条目（Windows 上按平台惯例折叠大小写），右侧展示其子项，因此 crumb 跳转读作后退一栏，而不是塌缩成单列。父层级这一程在 200ms 等待上限内落定时，目标与父层级两程以**同一帧**落地——在此之前陈旧视图持续渲染，导航换栏时因此没有中间的单栏闪现——超出该上限则目标即刻单独提交（Enter 提交的导航绝不会被滞塞的父层级扣作人质），迟到的父层级这一程再就地升级这次落地。父层级这一程在落地的 supersession 范围下运行，任何较新的意图都会在线上将其中止（因此在落地窗口内按 Escape 即撤回整次导航）；父层级这一程失败，或被截断的父窗口缺少目标时，都保留单栏落地——升级的存在正是为了锚定选中项，绝不能反而让它悬空。加载指示器遵循同一安静规则：它浮于内容右下角（绝不是会挪动布局的一行；截断／错误行占据左下角，并在扫描期间持续渲染），且仅在扫描超出 300ms 静默窗口后才出现，因此本地列举切换时什么也不显示。行选取被刻意豁免于同一帧规则：选取后立即分栏本身就是其选中态反馈（aria-current、crumb 跟随），而导航除了换栏本身没有任何东西可确认这次点击。两个时序常量都按本地列举校准；远程部署（每层级一次 RPC，通常 100–400ms）会落在静默窗口之内、crumb 上却没有按下态——待远程消费方落地时，重新审视该窗口或补上按下反馈。
 - **符号链接：为可进入性而跟随。** 用 `stat` 探测符号链接（断链／循环→跳过）；面包屑保留操作者导航的逻辑路径，`workspace.create` 在接纳时本就做 realpath 规范化。
 - **列举层级有上限，且流式处理。** 单次 `list` 至多返回 `maxEntries` 行（配置项，默认 1000——GitHub 网页端目录列举的同一上限）。层级经 `opendir` 流入一个按名排序、容量 `maxEntries + 1` 的候选窗口，内存保持 O(maxEntries)，可进入性探测只触及窗口内候选；线上 `DirectoryListing` 携带必填的 `truncated` 标志，让客户端明示不完整而不是静默缺尾。窗口内的断链符号链接不从窗口外回填——发生过驱逐本身已把层级标记为截断。窗口插入为二分查找、满窗尾部单次比较即拒绝（超大层级不能为每个 dirent 付出一次全窗扫描），且 `list(path, signal)` 透传载体的请求信号，滞塞网络目录的扫描不会在调用方断连后继续存活——扫描中的每个 await（打开、每次读取、每次符号链接探测）都与信号赛跑，中止路径放弃而非等待 close（Node 会把 close 排在在飞读取之后），被放弃的 settlement 全部吞掉，清理不会以未处理拒绝的形式冒出。无上限的层级对超大或恶意构造的目录就是内存／响应性漏洞。
 - **全盘可浏览，不做 roots 配置。** `workspace.create` 接受任意路径且 API 本就提供驱动 bash 的方法，浏览根只会是 UX 范围而非边界；没有消费方的可配置性过不了证据门槛。等到有部署需要再做。
@@ -30,6 +32,9 @@ web GUI 的"打开本地文件夹"流程被焊死在一种交互上：`host.pick
 - **统一方法集的 seam（`pick(): path`）。** 否决：应用内浏览器无法藏在一次宿主侧调用后面——浏览循环在客户端，需要协议上的原语；而对话框实现不了原语。交互差异不可约，故用判别标签。
 - **apiproxy 里直接调标准库（不建 seam）。** 否决：换装点仍是改网关源码，失去 fixture／测试后端，与促成这项工作的插件教义相悖。
 - **引入文件管理器／盘符枚举依赖。** 按上文调研否决；依赖政策要求记录于此。
+- **动作标签随状态翻转的"显示隐藏"开关（"隐藏隐藏文件"）。** 否决：会翻转的动作标签在状态与动作之间有歧义，还把否定叠了两层；固定标签加按下态呈现一次说清两者。
+- **纯 relatedTarget 失焦取消（不做 mousedown 抑制）。** 否决：Safari 在指针按下时不给按钮聚焦，点击触发的 focusout 因而携带空 `relatedTarget`，会在点击落地前就取消编辑器；编辑期作用的 mousedown 抑制加上锚定卡片的 relatedTarget 守卫才能同时覆盖指针与键盘路径。
+- **在 `DirectoryListing` 上增设线上 `separator` 字段（宿主标注 `path.sep`）。** 延期而非否决：它才是权威形态——含反斜杠的 POSIX 家目录会击穿 `listing.home` 启发式——但它触及 seam 类型与每个后端；browse 客户端的 `separatorOf` 挂着指向本方案的 TODO，直到下次安排线上变更。
 
 ## 后果
 

.agents/notes/implemented/bug-fix/2026-07-28-themed-scrollbars-and-reserved-gutter.i18n.yaml

@@ -2,5 +2,5 @@
 # side as of the last confirmed-consistent state. Both languages carry equal authority;
 # after editing either side, bring the other along and re-record with:
 #   pnpm run verify-translation-pairing --write .agents/notes/implemented/bug-fix/2026-07-28-themed-scrollbars-and-reserved-gutter.md
-2026-07-28-themed-scrollbars-and-reserved-gutter.md: 38228c868bb00210118e8110feb722fb81d0d56c
-2026-07-28-themed-scrollbars-and-reserved-gutter.zh.md: 9fafe1faa9303b5e2e23a1b3064904f71494026d
+2026-07-28-themed-scrollbars-and-reserved-gutter.md: b45f70b126d083916c756afb88a8b646a4e9bb85
+2026-07-28-themed-scrollbars-and-reserved-gutter.zh.md: 8afa36429ce7e6e061b014d63dcb20e5a642a84c

.agents/notes/implemented/bug-fix/2026-07-28-themed-scrollbars-and-reserved-gutter.md

@@ -20,13 +20,13 @@ The rules sit on `body`, not `html`. `design-platform.css` declares the `--dsw-a
 
 The two renderings are mutually exclusive, and the exclusion is enforced rather than assumed. A non-`auto` `scrollbar-width` or `scrollbar-color` makes Chromium and Safari discard every `::-webkit-scrollbar*` rule for that element, `::-webkit-scrollbar-thumb:hover` included. Declaring both unconditionally therefore leaves the hover token rendering nowhere at all: the engines that implement the hover pseudo-element are exactly the ones the standard properties silence, and Firefox has no hover pseudo-element to fall back on. The standard properties consequently sit inside `@supports not selector(::-webkit-scrollbar)`, which is true only where the pseudo-element is unimplemented, so Firefox takes the standard path and WebKit-based engines take the pseudo-element path. The WebKit rules are not gated in turn: an engine without those pseudo-elements drops them as unknown selectors, so a gate would only restate what selector matching already does. An engine too old for the `selector()` function makes the condition invalid, which evaluates false and selects the pseudo-element path — the correct side for the pre-16.4 Safari that is the realistic case for that reading.
 
-Both paths read one indirection pair, `--dsh-scrollbar-thumb` and `--dsh-scrollbar-thumb-hover`, bound on `body` to the l1 (base-surface) tokens. **This is the rebinding contract, and it is the part the CSS alone does not state**: an elevated surface sets `--dsh-scrollbar-thumb: var(--dsw-alias-scrollbar-bg-l2)` and `--dsh-scrollbar-thumb-hover: var(--dsw-alias-scrollbar-hover-l2)` on its own container, and that one rebind reaches the standard properties and the WebKit pseudo-elements together. The pair is rebound as a pair; rebinding the resting thumb alone leaves the hover state on the base-surface token. Eight surfaces rebind today: the command popup, the slash menu, the model-select panel, the settings panel, the shared `ui-primitives` menu card, the composer input card, the question composer card, and the todo panel. Most declare it on the elevated card rather than on the scrolling descendant, because the elevation is a property of the surface and custom properties inherit down to whichever child actually scrolls.
+Both paths read one indirection pair, `--dsh-scrollbar-thumb` and `--dsh-scrollbar-thumb-hover`, bound on `body` to the l1 (base-surface) tokens. **This is the rebinding contract, and it is the part the CSS alone does not state**: an elevated surface sets `--dsh-scrollbar-thumb: var(--dsw-alias-scrollbar-bg-l2)` and `--dsh-scrollbar-thumb-hover: var(--dsw-alias-scrollbar-hover-l2)` on its own container, and that one rebind reaches the standard properties and the WebKit pseudo-elements together. The pair is rebound as a pair; rebinding the resting thumb alone leaves the hover state on the base-surface token. The mechanically discoverable subset is owned by `packages/client/ui-theme/tests/scrollbar-styles.spec.ts`: any sheet that both scrolls and paints an elevated surface must rebind, so this note no longer maintains a complete surface inventory. Most declare the pair on the elevated card rather than on the scrolling descendant, because elevation belongs to the surface and custom properties inherit to whichever child actually scrolls.
 
-The last four were missed in the first implementation and found in review, which is why the rebinding contract is now checked mechanically rather than by inspection: a sheet that scrolls somewhere and paints an elevated surface somewhere must rebind.
+Four surfaces — `Menu`, `InputBar`, `QuestionComposer`, and `TodoPanel` — were missed in the first implementation and found in review, which is why the per-sheet rebinding contract is checked mechanically rather than by inspection.
 
 The elevated set is resolved from the palette's own dark elevation ladder — the surface tokens whose dark value lands on `bg-layer-2` or `bg-layer-3`, which is the step the l1/l2 split encodes. Deriving it instead from the sheets that already rebind was the first attempt and is unsound: such a set can only confirm what someone already remembered, and a surface nobody has rebound yet — exactly the case the check exists for — defines itself as unelevated. `--dsw-specific-tip` proved it, resolving to the menu surface's rung while the todo panel scrolled on it unrebound and the derived check stayed green.
 
-Scope is by token family, not by geometry: only `--dsw-alias-bg-*` and `--dsw-specific-*` name a surface. `--dsw-alias-button-*`, `--dsw-alias-interactive-*`, and `--dsw-alias-markdown-*` reach the same rungs while naming a control or an inline span that no scroll container renders its bar against. Shape cannot make that call, since a floating button legitimately carries a radius, a shadow, and a fixed size. The check is per sheet rather than per rule because the card and the descendant that scrolls are separate rules, and CSS text does not express which contains which.
+Scope is by token family, not by geometry: only `--dsw-alias-bg-*` and `--dsw-specific-*` name a surface. `--dsw-alias-button-*`, `--dsw-alias-interactive-*`, and `--dsw-alias-markdown-*` reach the same rungs while naming a control or an inline span that no scroll container renders its bar against. Shape cannot make that call, since a floating button legitimately carries a radius, a shadow, and a fixed size. The check is per sheet rather than per rule because the card and the descendant that scrolls are separate rules. That approximation cannot detect a scrolling component embedded in an elevated card painted by another package's stylesheet, as `DirectoryBrowser` inside `Modal` demonstrated; cross-sheet composition remains a review and assembled-UI responsibility.
 
 The track and the corner stay transparent, so the thumb reads against whatever surface scrolls under it; only the thumb and its hover state carry a token color.
 

.agents/notes/implemented/bug-fix/2026-07-28-themed-scrollbars-and-reserved-gutter.zh.md

@@ -20,13 +20,13 @@ Status: implemented
 
 两种渲染互斥，而这种互斥是被强制的，不是假定的。`scrollbar-width` 或 `scrollbar-color` 只要取非 `auto` 值，Chromium 与 Safari 就会丢弃该元素上的全部 `::-webkit-scrollbar*` 规则，`::-webkit-scrollbar-thumb:hover` 也在其中。因此无条件地同时声明会让 hover token 在任何地方都得不到渲染：实现了 hover 伪元素的引擎，恰恰就是被标准属性静音的那些，而 Firefox 没有 hover 伪元素可作退路。于是标准属性写在 `@supports not selector(::-webkit-scrollbar)` 之内，该条件只在伪元素未被实现处为真，因此 Firefox 走标准属性路径，WebKit 系引擎走伪元素路径。WebKit 规则不再反向加门禁：不实现这些伪元素的引擎会把它们当作未知选择器丢弃，因此加门禁只是重述选择器匹配本身已经做的事。对于旧到不支持 `selector()` 函数的引擎，该条件无效，从而求值为假并选中伪元素路径——对于这条判断下现实存在的 16.4 之前的 Safari，这正是正确的一侧。
 
-两条路径都读取同一组间接变量 `--dsh-scrollbar-thumb` 与 `--dsh-scrollbar-thumb-hover`，它们在 `body` 上绑定到 l1（基础表面）token。**这就是重新绑定契约，也是单看 CSS 无法得知的部分**：抬升表面在自己的容器上设置 `--dsh-scrollbar-thumb: var(--dsw-alias-scrollbar-bg-l2)` 与 `--dsh-scrollbar-thumb-hover: var(--dsw-alias-scrollbar-hover-l2)`，这一次重新绑定同时作用于标准属性和 WebKit 伪元素。这组变量必须成对重新绑定；只改静止态滑块会让 hover 状态仍留在基础表面的 token 上。目前有八处抬升表面做了重新绑定：命令浮层、斜杠菜单、模型选择面板、设置面板、`ui-primitives` 共用菜单卡片、输入条卡片、提问组件卡片与待办面板。多数把声明写在抬升卡片上而非滚动的后代元素上，因为抬升层级是这个表面的属性，而自定义属性会继承到真正滚动的那个子元素。
+两条路径都读取同一组间接变量 `--dsh-scrollbar-thumb` 与 `--dsh-scrollbar-thumb-hover`，它们在 `body` 上绑定到 l1（基础表面）token。**这就是重新绑定契约，也是单看 CSS 无法得知的部分**：抬升表面在自己的容器上设置 `--dsh-scrollbar-thumb: var(--dsw-alias-scrollbar-bg-l2)` 与 `--dsh-scrollbar-thumb-hover: var(--dsw-alias-scrollbar-hover-l2)`，这一次重新绑定同时作用于标准属性和 WebKit 伪元素。这组变量必须成对重新绑定；只改静止态滑块会让 hover 状态仍留在基础表面的 token 上。可由机械检查发现的子集归 `packages/client/ui-theme/tests/scrollbar-styles.spec.ts` 所有：任何既滚动又绘制抬升表面的样式表都必须重新绑定，因此本 note 不再维护完整的表面清单。多数把这组变量声明在抬升卡片上而非滚动的后代元素上，因为抬升层级属于这个表面，而自定义属性会继承到真正滚动的那个子元素。
 
-后四处在最初的实现里被漏掉、由评审发现，因此重新绑定契约现在由机械检查把关，而不再依赖人工审阅：一张样式表只要在某处滚动、又在某处绘制抬升表面，就必须重新绑定。
+`Menu`、`InputBar`、`QuestionComposer` 与 `TodoPanel` 这四个表面在最初的实现里被漏掉、由评审发现，因此逐样式表的重新绑定契约由机械检查而非人工审阅把关。
 
 抬升表面集合是从调色板自身的暗色抬升阶梯解析出来的——暗色取值落在 `bg-layer-2` 或 `bg-layer-3` 上的那些表面 token，而这一档正是 l1/l2 之分所编码的层级差。最初的做法是从已经做了重新绑定的样式表反向推导，那是不成立的：这样得到的集合只能确认别人已经记得的部分，而尚无人重新绑定的表面——恰恰就是这项检查存在的理由——会把自己定义成「非抬升」。`--dsw-specific-tip` 证明了这一点：它解析到与菜单表面相同的那一档，待办面板在它上面滚动却没有重新绑定，而推导式的检查依然是绿的。
 
-判定范围依据 token 家族而非几何形状：只有 `--dsw-alias-bg-*` 与 `--dsw-specific-*` 表述的是表面。`--dsw-alias-button-*`、`--dsw-alias-interactive-*` 与 `--dsw-alias-markdown-*` 会落到相同档位，但它们表述的是控件或行内片段，没有任何滚动容器会把滚动条画在它们之上。形状无法做这个判断，因为悬浮按钮本来就会带圆角、阴影和固定尺寸。这项检查以样式表为粒度而非以规则为粒度，因为卡片与真正滚动的后代元素是两条不同的规则，而 CSS 文本无法表达谁包含谁。
+判定范围依据 token 家族而非几何形状：只有 `--dsw-alias-bg-*` 与 `--dsw-specific-*` 表述的是表面。`--dsw-alias-button-*`、`--dsw-alias-interactive-*` 与 `--dsw-alias-markdown-*` 会落到相同档位，但它们表述的是控件或行内片段，没有任何滚动容器会把滚动条画在它们之上。形状无法做这个判断，因为悬浮按钮本来就会带圆角、阴影和固定尺寸。这项检查以样式表为粒度而非以规则为粒度，因为卡片与真正滚动的后代元素是两条不同的规则。这种近似检查无法检测嵌在由另一个包的样式表绘制的抬升卡片中的滚动组件，`Modal` 内的 `DirectoryBrowser` 就证明了这一点；跨样式表的组合仍需在评审和组装后 UI 层面把关。
 
 轨道与两条滚动条相交的角落保持透明，因此滑块是以其下滚动的任何表面为背景被看到；只有滑块及其 hover 状态带 token 颜色。
 

.agents/notes/implemented/feature/2026-07-29-persistent-bash-str-replace-editor.i18n.yaml

@@ -0,0 +1,6 @@
+# Bilingual-pair consistency record (docs/i18n/README.md): the git blob hash of each
+# side as of the last confirmed-consistent state. Both languages carry equal authority;
+# after editing either side, bring the other along and re-record with:
+#   pnpm run verify-translation-pairing --write .agents/notes/implemented/feature/2026-07-29-persistent-bash-str-replace-editor.md
+2026-07-29-persistent-bash-str-replace-editor.md: a97af750bdd80ddf38dc2d126e70c245ed035f35
+2026-07-29-persistent-bash-str-replace-editor.zh.md: 0c2ab26693d90c91d5c41a128ebb77a3c6cc2e7f

.agents/notes/implemented/feature/2026-07-29-persistent-bash-str-replace-editor.md

@@ -0,0 +1,33 @@
+# Agent Note: Persistent Bash and string-replacement editor tools
+
+Status: implemented
+
+English | [中文](2026-07-29-persistent-bash-str-replace-editor.zh.md)
+
+## Problem
+
+Some deployments need a one-call Bash schema whose shell state survives across model turns, while others need a Claude-style `str_replace_editor` independent of their terminal choice. Bundling the two tools or naming them after one benchmark would prevent reuse and blur configuration ownership.
+
+## Decision
+
+`@deepseek-ai/dsh-tool-bash-persistent` consumes `ctx.pty` and registers one `bash(command)` tool. It lazily creates one interactive shell per exact Agent and serializes that owner's calls. Cwd, exported variables, activated environments, functions, and background jobs persist. Random private markers delimit command output. Retained scrollback is paged backward to recover the command's original prefix; a dropped prefix is reported explicitly. A nonzero wrapped command appends `[exit code: N]`; a shell that dies before reporting that status instead appends `[shell exited: code N]`, `[shell killed by signal: SIG]`, or `[shell exited]` when the backend supplies neither. `maxOutputChars` bounds retained command output, while fixed diagnostics can extend the returned string. Timeout or cancellation closes the shell before another call can reuse uncertain state, and model-visible timeout/exit results disclose that reset. Cancellation always resets and discards the result, even when a complete status marker is already observable, so state changes the model never saw cannot survive. The configurable description defaults to persistence facts only, so network and package-mirror claims remain deployment-owned.
+
+`@deepseek-ai/dsh-tool-str-replace-editor` independently consumes `ctx.fs` and registers `str_replace_editor` with `view`, `create`, `str_replace`, and `insert`. It provides numbered text views, filtered two-level directory listings, unique literal replacement, canonical insertion boundaries, and bounded output. Paths are absolute; file views preserve content tabs so copied text remains valid literal replacement input; mutations preserve tabs outside the requested edit; and the public schema and failures use only `old_str`. The plugin can compose with persistent Bash, one-shot Bash, sandboxed Bash, or no shell.
+
+`dsh-system-prompt` accepts `includeHarnessIdentity: false`, while `dsh-agent-spine-demo` forwards that setting and accepts `toolBash: false`. A deployment can therefore own an exact persona and replace the spine's native Bash without duplicate prompt or tool registrations. Existing defaults remain unchanged.
+
+Both plugins are included in the Python runtime closure. The persistent Bash closure also includes the PTY service/local backend and the sandbox services required by that backend. Because `node-pty` executes a native `spawn-helper` on macOS, each packaged macOS runtime executable ships with a `-spawn-helper` sibling; Linux uses `forkpty` directly. A pinned `node-pty` patch checks `DSH_NODE_PTY_SPAWN_HELPER` first, so it remains a true override for a current external consumer that supplies a non-sibling helper. When the override is unset, the patch resolves the packaged executable sibling if present and otherwise preserves upstream lookup in ordinary Node runs. The macOS builders fail before publication when the helper is absent or not executable.
+
+## Alternatives considered
+
+**One combined compatibility plugin.** Rejected because neither tool requires the other and the combined name would tie reusable capabilities to one benchmark.
+
+**Reuse one-shot Bash.** Rejected because `bash -c` cannot preserve cwd or environment state across calls.
+
+**Expose terminal management tools.** Rejected because open/send/read/close is a different model action space from one persistent `bash` call.
+
+**Modify native read/write/edit.** Rejected because it would distort their general-purpose contracts instead of adding an independently composable editor.
+
+## Consequences
+
+Profiles can reproduce an external agent by configuring persona and descriptions while the underlying packages remain general. Persistent Bash requires an owning Agent and real PTY backend. Shell exit, timeout, or cancellation loses state. The editor delegates security and mutation policy to the mounted filesystem stack. Runtime-wheel consumers still need no Node installation; Linux wheels contain one executable, while macOS wheels also contain its private native helper.

.agents/notes/implemented/feature/2026-07-29-persistent-bash-str-replace-editor.zh.md

@@ -0,0 +1,33 @@
+# Agent Note：持久 Bash 与字符串替换编辑器工具
+
+状态：已实现
+
+[English](2026-07-29-persistent-bash-str-replace-editor.md) | 中文
+
+## 问题
+
+部分部署需要只调用一次的 Bash schema，同时要求 shell 状态跨模型轮次保留；另一些部署需要与终端选择无关的 Claude 风格 `str_replace_editor`。把两个工具绑在一起或按某个基准命名，会阻碍复用并模糊配置归属。
+
+## 决策
+
+`@deepseek-ai/dsh-tool-bash-persistent` 消费 `ctx.pty` 并注册一个 `bash(command)` 工具。它为每个精确 Agent 惰性创建一个交互式 shell，并串行化该所有者的调用。Cwd、导出的变量、已激活环境、函数和后台任务会保留。随机私有标记划分命令输出；保留的 scrollback 会向前分页，以恢复命令真正的输出前缀，若前缀已被丢弃则明确告知。经封装的命令以非零状态结束时，会追加 `[exit code: N]`；若 shell 在报告该状态前终止，则改为追加 `[shell exited: code N]`、`[shell killed by signal: SIG]`，或在后端既未提供退出码也未提供信号时追加 `[shell exited]`。`maxOutputChars` 限制保留的命令输出，而固定诊断可能使返回字符串更长。超时或取消会先关闭 shell，避免下一次调用复用状态不确定的会话，模型可见的超时／退出结果也会说明该重置。取消始终会重置 shell 并丢弃结果，即使已经能观察到完整状态标记也是如此，从而不会让模型未曾看到的状态变更得以保留。可配置描述默认只声明持久性事实，因此网络和软件包镜像等声明仍归部署所有。
+
+`@deepseek-ai/dsh-tool-str-replace-editor` 独立消费 `ctx.fs`，注册包含 `view`、`create`、`str_replace` 与 `insert` 的 `str_replace_editor`。它提供带行号文本查看、过滤后的两层目录列表、唯一字面量替换、规范插入边界和有界输出。路径必须为绝对路径；文件查看会保留内容中的制表符，因此复制的文本仍可作为有效的字面量替换输入；变更会保留请求编辑范围之外的制表符；公开 schema 与错误则只使用 `old_str`。它可以与持久 Bash、一次性 Bash、沙箱 Bash 或无 shell 组合。
+
+`dsh-system-prompt` 接受 `includeHarnessIdentity: false`；`dsh-agent-spine-demo` 会转发该设置，并接受 `toolBash: false`。因此部署可以拥有精确 persona，并替换 spine 的原生 Bash，而不会重复注册提示词或工具。既有默认值不变。
+
+两个插件都进入 Python runtime 闭包。持久 Bash 的闭包还包含 PTY 服务／本地后端，以及该后端要求的沙箱服务。由于 `node-pty` 在 macOS 上会执行原生 `spawn-helper`，每个打包后的 macOS 运行时可执行文件都会携带一个 `-spawn-helper` 伴随文件；Linux 直接使用 `forkpty`。固定版本的 `node-pty` 补丁会先检查 `DSH_NODE_PTY_SPAWN_HELPER`，因此对当前提供非伴随 helper 的外部消费方而言，该变量仍是真正的覆盖项。未设置该覆盖时，补丁会在打包可执行文件的伴随文件存在时解析它，否则在普通 Node 运行中保留上游查找方式。若 helper 缺失或不可执行，macOS 构建器会在发布前失败。
+
+## 考虑过的替代方案
+
+**单一组合兼容插件。** 被拒绝，因为两个工具互不依赖，组合命名还会把可复用能力绑定到某个基准。
+
+**复用一次性 Bash。** 被拒绝，因为 `bash -c` 无法跨调用保留 cwd 或环境状态。
+
+**暴露终端管理工具。** 被拒绝，因为 open/send/read/close 与单个持久 `bash` 调用是不同的模型动作空间。
+
+**修改原生 read/write/edit。** 被拒绝，因为这会扭曲其通用契约，而不是增加一个可独立组合的编辑器。
+
+## 后果
+
+Profile 可以通过配置 persona 和描述复现外部 Agent，而底层包保持通用。持久 Bash 需要拥有它的 Agent 与真实 PTY 后端；shell 退出、超时或取消会丢失状态。编辑器把安全与变更策略委托给挂载的文件系统栈。运行时 wheel 包的消费方仍无需安装 Node；Linux wheel 包包含一个可执行文件，macOS wheel 包还包含其私有原生 helper。

apps/web/tests/snapshots/workspace-management/directory-browser.expected.md

@@ -5,6 +5,37 @@
     - img
     - button "browse-golden"
   - button "Edit path"
+  - list:
+    - listitem:
+      - button "adopted":
+        - img
+        - text: adopted
+        - img
+    - listitem:
+      - button "alpha-ws":
+        - img
+        - text: alpha-ws
+        - img
+    - listitem:
+      - button "beta-ws":
+        - img
+        - text: beta-ws
+        - img
+    - listitem:
+      - button "browse-golden":
+        - img
+        - text: browse-golden
+        - img
+    - listitem:
+      - button "same-name":
+        - img
+        - text: same-name
+        - img
+    - listitem:
+      - button "workspace":
+        - img
+        - text: workspace
+        - img
   - list:
     - listitem:
       - button "alpha":
@@ -19,5 +50,6 @@
   - button "New folder":
     - img
     - text: New folder
+  - button "Show hidden files"
   - button "Cancel"
   - button "Open"

docs/config-catalog.md

@@ -116,9 +116,9 @@ Source: [`packages/core/agent-loop/src/index.ts:155`](../packages/core/agent-loo
 /**
  * Bundle config: each field forwarded verbatim to the child that owns it —
  * `agents` to the agent loop (an app that pre-creates no agents, like the ACP
- * bridge, simply omits it), `persona` and `toolOrder` to the system-prompt
- * plugin (the deployment's persona section and the explicit model-facing tool
- * order), the `tools` object to the tool registry (its presentation `mode`),
+ * bridge, simply omits it), `includeHarnessIdentity`, `persona`, and `toolOrder`
+ * to the system-prompt plugin (the fixed opener, deployment persona, and explicit
+ * model-facing tool order), the `tools` object to the tool registry (its presentation `mode`),
  * `dshHome` to bash environment and local skill discovery, `sessionTitle` to
  * the fallback title service, `skills` to the
  * skill registry/local provider/tool consumer, `workspaceContext` to the
@@ -131,13 +131,16 @@ Source: [`packages/core/agent-loop/src/index.ts:155`](../packages/core/agent-loo
  * workspace context instead requires an explicit byte budget or `false` because
  * it changes model-visible input. Producer opt-in stays producer-local:
  * `toolBash` configures bash only; independently composed producers keep their
- * own config.
+ * own config. Set `toolBash: false` when another plugin owns the model-facing
+ * `bash` name.
  */
 export interface Config {
   /** The agent-loop `agents` list (see dsh-agent-loop's `Config`). */
   agents?: AgentLoopConfig['agents']
   /** Agent-loop concurrency cap; `1` is serial. */
   maxParallelToolCalls?: AgentLoopConfig['maxParallelToolCalls']
+  /** Whether the system prompt includes the fixed Harness identity (default true). */
+  includeHarnessIdentity?: SystemPromptConfig['includeHarnessIdentity']
   /** The deployment persona (see dsh-system-prompt's `Config`). */
   persona?: SystemPromptConfig['persona']
   /** The explicit model-facing tool order (see dsh-system-prompt's `Config`). */
@@ -150,10 +153,14 @@ export interface Config {
   sessionTitle?: SessionTitleConfig
   /** Workspace-context loader controls with an explicit byte budget; set `false` for hermetic prompts. */
   workspaceContext: workspaceContext.Config | false
-  /** Skill registry, local provider, and model-facing consumer config. */
+  /**
+   * Skill registry, local provider, and model-facing consumer config.
+   * Skills use `enabled` because one nested config controls a provider stack;
+   * single model-tool plugins use `Config | false` to disable that one consumer.
+   */
   skills?: SkillConfig
-  /** Model-facing bash tool config, including this producer's background opt-in. */
-  toolBash?: toolBash.Config
+  /** Model-facing bash tool config, or false when another plugin owns `bash`. */
+  toolBash?: toolBash.Config | false
   /** Generic background-task controls; set false to keep the task service without model-facing task tools. */
   toolTasks?: toolTasks.Config | false
   /** Global enablement and package-name filters for invariant companions. */
@@ -185,7 +192,7 @@ export interface GoalConfig {
 
 Depends on: [`AgentLoopConfig`](#deepseek-aidsh-agent-loop) · [`GoalDomainConfig`](#deepseek-aidsh-goal) · [`InvariantConfig`](#deepseek-aidsh-invariants) · [`SessionTitleConfig`](#deepseek-aidsh-session-title) · [`SkillLocal`](../packages/skill/skill-local/src/index.ts) · [`SkillRegistryConfig`](#deepseek-aidsh-skill) · [`SystemPromptConfig`](#deepseek-aidsh-system-prompt) · [`toolBash`](../packages/bash/tool-bash/src/index.ts) · [`toolGoal`](../packages/goal/tool-goal/src/index.ts) · [`ToolsConfig`](#deepseek-aidsh-tools) · [`toolSkill`](../packages/skill/tool-skill/src/index.ts) · [`toolTasks`](../packages/tasks/tool-tasks/src/index.ts) · [`workspaceContext`](../packages/context/workspace-context/src/index.ts)
 
-Source: [`packages/examples/agent-spine-demo/src/index.ts:88`](../packages/examples/agent-spine-demo/src/index.ts)
+Source: [`packages/examples/agent-spine-demo/src/index.ts:89`](../packages/examples/agent-spine-demo/src/index.ts)
 
 ## `@deepseek-ai/dsh-bash-local`
 
@@ -1521,6 +1528,8 @@ Source: [`packages/subagent/subagent-spawn/src/index.ts:20`](../packages/subagen
 ```ts config-catalog
 /** Plugin config: the deployment-authored fragment of the system prompt (see {@link Config.persona} for its contract). */
 export interface Config {
+  /** Include the fixed DeepSeek Harness identity before the deployment persona (default true). */
+  includeHarnessIdentity?: boolean
   /**
    * Deployment-wide order-0 persona template. A scoped section named
    * `deployment:persona` shadows it; `{{variable}}` references are strict.
@@ -1592,6 +1601,26 @@ export interface Config {
 
 Source: [`packages/bash/tool-bash/src/index.ts:41`](../packages/bash/tool-bash/src/index.ts)
 
+## `@deepseek-ai/dsh-tool-bash-persistent`
+
+Requires: `tools` · `pty`
+
+```ts config-catalog
+/** Configuration for the persistent Bash tool. */
+export interface Config {
+  /** PTY backend used for each owner-isolated persistent shell (default `shell`). */
+  backendType?: string
+  /** Wall-clock limit for one command (default 300000). */
+  timeoutMs?: number
+  /** Maximum returned command-output characters before clipping (default 16000). */
+  maxOutputChars?: number
+  /** Model-facing tool description; deployments may describe their environment. */
+  description?: string
+}
+```
+
+Source: [`packages/pty/tool-bash-persistent/src/index.ts:405`](../packages/pty/tool-bash-persistent/src/index.ts)
+
 ## `@deepseek-ai/dsh-tool-cordis`
 
 Requires: `tools`
@@ -1750,6 +1779,22 @@ export interface Config {
 
 Source: [`packages/skill/tool-skill/src/index.ts:30`](../packages/skill/tool-skill/src/index.ts)
 
+## `@deepseek-ai/dsh-tool-str-replace-editor`
+
+Requires: `tools` · `fs`
+
+```ts config-catalog
+/** Configuration for the string-replacement editor tool. */
+export interface Config {
+  /** Maximum returned view characters before clipping (default 16000). */
+  maxOutputChars?: number
+  /** Model-facing tool description. */
+  description?: string
+}
+```
+
+Source: [`packages/fs/tool-str-replace-editor/src/index.ts:496`](../packages/fs/tool-str-replace-editor/src/index.ts)
+
 ## `@deepseek-ai/dsh-tool-subagent`
 
 Requires: `tools` · `subagents`

docs/cordis-catalog/services.md

@@ -1901,7 +1901,7 @@ async assemble(context: AssembleContext = {}): Promise<PromptAssembly>
 
 Types: [AssembleContext](../core-data-structures/system-prompt.md) · [PromptSection](../core-data-structures/system-prompt.md) · [ToolProviderResult](../core-data-structures/system-prompt.md)
 
-Source: [`packages/core/system-prompt/src/index.ts:246`](../../packages/core/system-prompt/src/index.ts)
+Source: [`packages/core/system-prompt/src/index.ts:248`](../../packages/core/system-prompt/src/index.ts)
 
 ## `ctx.tasks` — `TaskService` (abstract seam)
 

docs/event-producer-consumer.md

@@ -27,9 +27,9 @@ This matrix shows which packages dispatch each harness-owned event and which pac
 | `approval/request` | `waterfall` | [`packages/ui/user-approval/src/index.ts:30`](../packages/ui/user-approval/src/index.ts) | [`user-approval`](../packages/ui/user-approval) (`waterfall`) | [`acp`](../packages/acp/acp), `apiproxy` |
 | `commands/change` | `emit` | [`packages/ui/commands/src/index.ts:154`](../packages/ui/commands/src/index.ts) | [`commands`](../packages/ui/commands) (`events.dispatch`) | `apiproxy`, [`tui`](../packages/ui/tui) |
 | `domain/changed` | `emit` | [`packages/storage/storage-domain/src/events.ts:46`](../packages/storage/storage-domain/src/events.ts) | [`storage-domain`](../packages/storage/storage-domain) (`emit`) | `apiproxy`, [`storage-domain`](../packages/storage/storage-domain), [`workspace`](../packages/workspace/workspace) |
-| `fs/edit-intent` | `waterfall` | [`packages/fs/fs/src/index.ts:62`](../packages/fs/fs/src/index.ts) | [`tool-fs`](../packages/fs/tool-fs) (`waterfall`) | [`fs-policy`](../packages/fs/fs-policy) |
-| `fs/observed` | `emit` | [`packages/fs/fs/src/index.ts:71`](../packages/fs/fs/src/index.ts) | [`tool-fs`](../packages/fs/tool-fs) (`emit`) | [`fs-policy`](../packages/fs/fs-policy), [`skill-local`](../packages/skill/skill-local) |
-| `fs/write-intent` | `waterfall` | [`packages/fs/fs/src/index.ts:54`](../packages/fs/fs/src/index.ts) | [`tool-fs`](../packages/fs/tool-fs) (`waterfall`) | [`fs-policy`](../packages/fs/fs-policy) |
+| `fs/edit-intent` | `waterfall` | [`packages/fs/fs/src/index.ts:62`](../packages/fs/fs/src/index.ts) | [`tool-fs`](../packages/fs/tool-fs) (`waterfall`), [`tool-str-replace-editor`](../packages/fs/tool-str-replace-editor) (`waterfall`) | [`fs-policy`](../packages/fs/fs-policy) |
+| `fs/observed` | `emit` | [`packages/fs/fs/src/index.ts:71`](../packages/fs/fs/src/index.ts) | [`tool-fs`](../packages/fs/tool-fs) (`emit`), [`tool-str-replace-editor`](../packages/fs/tool-str-replace-editor) (`emit`) | [`fs-policy`](../packages/fs/fs-policy), [`skill-local`](../packages/skill/skill-local) |
+| `fs/write-intent` | `waterfall` | [`packages/fs/fs/src/index.ts:54`](../packages/fs/fs/src/index.ts) | [`tool-fs`](../packages/fs/tool-fs) (`waterfall`), [`tool-str-replace-editor`](../packages/fs/tool-str-replace-editor) (`waterfall`) | [`fs-policy`](../packages/fs/fs-policy) |
 | `goal/changed` | `emit` | [`packages/goal/goal/src/domain.ts:135`](../packages/goal/goal/src/domain.ts) | [`goal`](../packages/goal/goal) (`emit`) | [`goal-session`](../packages/goal/goal-session) |
 | `llm/stream` | `waterfall` | [`packages/llm/llm/src/index.ts:58`](../packages/llm/llm/src/index.ts) | [`llm`](../packages/llm/llm) (`waterfall`) | [`agent-loop`](../packages/core/agent-loop), [`llm`](../packages/llm/llm), [`llm-replay`](../packages/support/llm-replay), [`session-checkpoint-policy`](../packages/session-persistence/session-checkpoint-policy), [`session-title`](../packages/session-title/session-title) |
 | `session/created` | `emit` | [`packages/core/session/src/index.ts:71`](../packages/core/session/src/index.ts) | [`session`](../packages/core/session) (`events.dispatch`) | `apiproxy`, [`compact`](../packages/compact/compact), [`goal`](../packages/goal/goal), [`hook-protocol`](../packages/hooks/hook-protocol), [`jsonrpc`](../packages/ui/jsonrpc), [`llm-retry`](../packages/llm/llm-retry), [`plan-mode`](../packages/plan/plan-mode), [`session`](../packages/core/session), [`session-persistence`](../packages/session-persistence/session-persistence), [`session-telemetry`](../packages/telemetry/session-telemetry), [`tools`](../packages/core/tools), [`user-approval`](../packages/ui/user-approval) |

docs/module-graph.md

@@ -48,6 +48,7 @@ flowchart TD
     pkg_fs_sandbox["fs-sandbox"]
     pkg_tool_fs["tool-fs"]
     pkg_tool_fs_search["tool-fs-search"]
+    pkg_tool_str_replace_editor["tool-str-replace-editor"]
   end
   subgraph group_skill["packages/skill"]
     pkg_skill["skill"]
@@ -205,6 +206,7 @@ flowchart TD
   subgraph group_pty["packages/pty"]
     pkg_pty["pty"]
     pkg_pty_local["pty-local"]
+    pkg_tool_bash_persistent["tool-bash-persistent"]
     pkg_tool_pty["tool-pty"]
   end
   subgraph group_sandbox["packages/sandbox"]
@@ -692,6 +694,11 @@ flowchart TD
   pkg_tool_fs_search --> pkg_spill
   pkg_tool_fs_search --> pkg_system_prompt
   pkg_tool_fs_search --> pkg_tools
+  pkg_tool_str_replace_editor --> pkg_fs
+  pkg_tool_str_replace_editor --> pkg_invariants
+  pkg_tool_str_replace_editor --> pkg_sandbox
+  pkg_tool_str_replace_editor --> pkg_sandbox_policy
+  pkg_tool_str_replace_editor --> pkg_tools
   pkg_tool_skill --> pkg_agent
   pkg_tool_skill --> pkg_invariants
   pkg_tool_skill --> pkg_llm
@@ -812,6 +819,11 @@ flowchart TD
   pkg_mcp_client --> pkg_llm
   pkg_mcp_client --> pkg_subprocess
   pkg_mcp_client --> pkg_tools
+  pkg_tool_bash_persistent --> pkg_agent
+  pkg_tool_bash_persistent --> pkg_invariants
+  pkg_tool_bash_persistent --> pkg_pty
+  pkg_tool_bash_persistent --> pkg_timeout
+  pkg_tool_bash_persistent --> pkg_tools
   pkg_tool_pty --> pkg_agent
   pkg_tool_pty --> pkg_invariants
   pkg_tool_pty --> pkg_llm
@@ -1119,6 +1131,7 @@ flowchart TD
 | [`tool-bash`](../packages/bash/tool-bash) | `bash` | [`agent`](../packages/core/agent), [`bash`](../packages/bash/bash), [`invariants`](../packages/support/invariants), [`llm`](../packages/llm/llm), [`paths`](../packages/util/paths), [`sandbox`](../packages/sandbox/sandbox), [`sandbox-policy`](../packages/sandbox/sandbox-policy), [`session-persistence`](../packages/session-persistence/session-persistence), [`system-prompt`](../packages/core/system-prompt), [`tasks`](../packages/tasks/tasks), [`tools`](../packages/core/tools), [`user-approval`](../packages/ui/user-approval) |
 | [`tool-fs`](../packages/fs/tool-fs) | `fs` | [`fs`](../packages/fs/fs), [`invariants`](../packages/support/invariants), [`llm`](../packages/llm/llm), [`sandbox`](../packages/sandbox/sandbox), [`sandbox-policy`](../packages/sandbox/sandbox-policy), [`session`](../packages/core/session), [`system-prompt`](../packages/core/system-prompt), [`tools`](../packages/core/tools), [`user-approval`](../packages/ui/user-approval) |
 | [`tool-fs-search`](../packages/fs/tool-fs-search) | `fs` | [`bash`](../packages/bash/bash), [`invariants`](../packages/support/invariants), [`llm`](../packages/llm/llm), [`retention`](../packages/util/retention), [`session`](../packages/core/session), [`spill`](../packages/spill/spill), [`system-prompt`](../packages/core/system-prompt), [`tools`](../packages/core/tools) |
+| [`tool-str-replace-editor`](../packages/fs/tool-str-replace-editor) | `fs` | [`fs`](../packages/fs/fs), [`invariants`](../packages/support/invariants), [`sandbox`](../packages/sandbox/sandbox), [`sandbox-policy`](../packages/sandbox/sandbox-policy), [`tools`](../packages/core/tools) |
 | [`tool-skill`](../packages/skill/tool-skill) | `skill` | [`agent`](../packages/core/agent), [`invariants`](../packages/support/invariants), [`llm`](../packages/llm/llm), [`skill`](../packages/skill/skill), [`tools`](../packages/core/tools) |
 | [`subagent`](../packages/subagent/subagent) | `subagent` | [`agent`](../packages/core/agent), [`brand`](../packages/util/brand), [`invariants`](../packages/support/invariants), [`llm`](../packages/llm/llm), [`scope`](../packages/core/scope), [`session`](../packages/core/session), [`tools`](../packages/core/tools) |
 | [`tool-web`](../packages/web/tool-web) | `web` | [`invariants`](../packages/support/invariants), [`llm`](../packages/llm/llm), [`system-prompt`](../packages/core/system-prompt), [`tools`](../packages/core/tools), [`web`](../packages/web/web) |
@@ -1141,6 +1154,7 @@ flowchart TD
 | [`repeat-tool-guard`](../packages/guard/repeat-tool-guard) | `guard` | [`agent`](../packages/core/agent), [`invariants`](../packages/support/invariants), [`tools`](../packages/core/tools) |
 | [`tool-lsp`](../packages/lsp/tool-lsp) | `lsp` | [`invariants`](../packages/support/invariants), [`llm`](../packages/llm/llm), [`lsp`](../packages/lsp/lsp), [`system-prompt`](../packages/core/system-prompt), [`timeout`](../packages/util/timeout), [`tools`](../packages/core/tools) |
 | [`mcp-client`](../packages/mcp/mcp-client) | `mcp` | [`invariants`](../packages/support/invariants), [`llm`](../packages/llm/llm), [`subprocess`](../packages/subprocess/subprocess), [`tools`](../packages/core/tools) |
+| [`tool-bash-persistent`](../packages/pty/tool-bash-persistent) | `pty` | [`agent`](../packages/core/agent), [`invariants`](../packages/support/invariants), [`pty`](../packages/pty/pty), [`timeout`](../packages/util/timeout), [`tools`](../packages/core/tools) |
 | [`tool-pty`](../packages/pty/tool-pty) | `pty` | [`agent`](../packages/core/agent), [`invariants`](../packages/support/invariants), [`llm`](../packages/llm/llm), [`pty`](../packages/pty/pty), [`retention`](../packages/util/retention), [`system-prompt`](../packages/core/system-prompt), [`tasks`](../packages/tasks/tasks), [`tools`](../packages/core/tools) |
 | [`tool-tasks`](../packages/tasks/tool-tasks) | `tasks` | [`agent`](../packages/core/agent), [`invariants`](../packages/support/invariants), [`llm`](../packages/llm/llm), [`retention`](../packages/util/retention), [`system-prompt`](../packages/core/system-prompt), [`tasks`](../packages/tasks/tasks), [`tools`](../packages/core/tools) |
 | [`tool-workflow`](../packages/workflow/tool-workflow) | `workflow` | [`agent`](../packages/core/agent), [`invariants`](../packages/support/invariants), [`llm`](../packages/llm/llm), [`system-prompt`](../packages/core/system-prompt), [`tools`](../packages/core/tools), [`workflow`](../packages/workflow/workflow) |

docs/tool-catalog.md

@@ -20,6 +20,8 @@ This table connects model-visible tool names to the plugin package and service s
 | `@deepseek-ai/dsh-plan-mode` | `exit_plan_mode` | `ctx.tools`, `ctx.systemPrompt`, `ctx.userInteraction (execution time, opportunistic)` | `tool/call`, `plan/mode inactive on an approved review`, `tool/result` | - | exit_plan_mode stays in the model-facing schema while planning is inactive so transitions add no tool-catalog churn on top of the plan-policy change. Its execute path rejects calls outside plan mode; in plan mode it presents the plan over the user-interaction seam (approve / keep planning with feedback), and approval logs plan mode inactive at the step boundary. |
 | `@deepseek-ai/dsh-tool-bash` | `bash` | `ctx.tools`, `ctx.bash`, `ctx.tasks at call time for run_in_background` | `tool/call`, `tool/result` | - | The bash tool is the model-facing consumer of the bash executor seam. A `run_in_background` run registers with the generic `ctx.tasks` runtime and is collected/stopped through the `task_*` tools from `@deepseek-ai/dsh-tool-tasks`; the `enableRunInBackground` config (default true) removes the parameter entirely when disabled. |
 | `@deepseek-ai/dsh-tool-cordis` | `cordis_inspect`, `cordis_mount`, `cordis_unmount` | `ctx.tools` | `tool/call`, `tool/result`, `process-local temporary Plugin lifecycle` | - | Ships in examples/cordis-agent only (a deliberate opt-in — temporary Plugin code reaches the real runtime, see .agents/notes/implemented/feature/2026-07-08-self-referential-cordis-toolset.md). Plugins created by cordis_mount may register ADDITIONAL model-visible tools until unmounted or DSH restarts; a full changed request header logs those tool-set changes. |
+| `@deepseek-ai/dsh-tool-bash-persistent` | `bash` | `ctx.tools`, `ctx.pty`, `an owning Agent at execution time` | `tool/call`, `PTY shell state`, `tool/result` | - | One owner-isolated persistent bash tool; deployment composition supplies the PTY backend and may override the model-facing environment description. |
+| `@deepseek-ai/dsh-tool-str-replace-editor` | `str_replace_editor` | `ctx.tools`, `ctx.fs` | `tool/call`, `fs/observed after successful file operations`, `tool/result` | - | Standalone view/create/unique literal replace/line insert tool over the filesystem seam; it composes with any shell or terminal surface. |
 | `@deepseek-ai/dsh-tool-fs` | `edit`, `read`, `write` | `ctx.tools`, `ctx.fs`, `ctx.systemPrompt` | `tool/call`, `fs/write-intent or fs/edit-intent for mutations`, `fs/observed after successful file operations`, `tool/result` | - | The read-before-write/edit policy is added by `@deepseek-ai/dsh-fs-policy` (an `fs/*` event-gate plugin, no schema change); a deployment that loads these tools is expected to also load it. The tool schemas above are identical with or without the policy plugin. |
 | `@deepseek-ai/dsh-tool-fs-search` | `glob`, `grep` | `ctx.tools`, `ctx.bash`, `ctx.systemPrompt` | `tool/call`, `tool/result` | - | glob and grep are conditional bash-backed discovery tools: they register only when ctx.bash can find `rg`, then run fixed ripgrep commands through ctx.bash as ordinary foreground calls (never background tasks). Capped results save the complete formatted list through the optional ctx.spillStore backend; returned locators are follow-up-readable/searchable when the backend exposes local paths in co-located deployments. |
 | `@deepseek-ai/dsh-tool-pty` | `terminal_close`, `terminal_list`, `terminal_open`, `terminal_read`, `terminal_send`, `terminal_signal` | `ctx.tools`, `ctx.pty`, `ctx.systemPrompt`, `ctx.tasks at call time for run_in_background` | `tool/call`, `tool/result` | - | The six terminal tools are opt-in and complement one-shot bash/filesystem tools. `terminal_send(run_in_background: true)` registers with `ctx.tasks`; TUI, named key sequences, BEL, resize, auto-start, and cross-agent sharing are absent from the schema. |
@@ -279,6 +281,99 @@ Source: [`packages/cordis/tool-cordis/src/index.ts`](../packages/cordis/tool-cor
 
 Ships in examples/cordis-agent only (a deliberate opt-in — temporary Plugin code reaches the real runtime, see .agents/notes/implemented/feature/2026-07-08-self-referential-cordis-toolset.md). Plugins created by cordis_mount may register ADDITIONAL model-visible tools until unmounted or DSH restarts; a full changed request header logs those tool-set changes.
 
+## `@deepseek-ai/dsh-tool-bash-persistent`
+
+### `bash`
+
+Run commands in a persistent bash shell. State, including the current directory and exported environment variables, persists across calls for this agent.
+
+```json
+{
+  "type": "object",
+  "properties": {
+    "command": {
+      "type": "string",
+      "description": "The bash command to run. Relative path is preferred in the command."
+    }
+  },
+  "required": [
+    "command"
+  ]
+}
+```
+
+Source: [`packages/pty/tool-bash-persistent/src/index.ts`](../packages/pty/tool-bash-persistent/src/index.ts)
+
+One owner-isolated persistent bash tool; deployment composition supplies the PTY backend and may override the model-facing environment description.
+
+## `@deepseek-ai/dsh-tool-str-replace-editor`
+
+### `str_replace_editor`
+
+Custom editing tool for viewing, creating and editing files
+* State is persistent across command calls and discussions with the user
+* If `path` is a file, `view` displays the result of applying `cat -n`. If `path` is a directory, `view` lists non-hidden files and directories up to 2 levels deep
+* The `create` command cannot be used if the specified `path` already exists as a file
+* If a `command` generates a long output, it will be truncated and marked with `<response clipped>`
+
+Notes for using the `str_replace` command:
+* The `old_str` parameter should match EXACTLY one or more consecutive lines from the original file. Be mindful of whitespaces!
+* If the `old_str` parameter is not unique in the file, the replacement will not be performed. Make sure to include enough context in `old_str` to make it unique
+* The `new_str` parameter should contain the edited lines that should replace the `old_str`
+
+```json
+{
+  "type": "object",
+  "properties": {
+    "command": {
+      "type": "string",
+      "description": "The commands to run. Allowed options are: `view`, `create`, `str_replace`, `insert`.",
+      "enum": [
+        "view",
+        "create",
+        "str_replace",
+        "insert"
+      ]
+    },
+    "path": {
+      "type": "string",
+      "description": "Absolute path to file or directory, e.g. `/repo/file.py` or `/repo`."
+    },
+    "file_text": {
+      "type": "string",
+      "description": "Required parameter of `create` command, with the content of the file to be created."
+    },
+    "insert_line": {
+      "type": "integer",
+      "description": "Required parameter of `insert` command. The `new_str` will be inserted AFTER the line `insert_line` of `path`."
+    },
+    "new_str": {
+      "type": "string",
+      "description": "Optional parameter of `str_replace` command containing the new string (if not given, no string will be added). Required parameter of `insert` command containing the string to insert."
+    },
+    "old_str": {
+      "type": "string",
+      "description": "Required parameter of `str_replace` command containing the string in `path` to replace."
+    },
+    "view_range": {
+      "type": "array",
+      "description": "Optional parameter of `view` command when `path` points to a file. If none is given, the full file is shown. If provided, the file will be shown in the indicated line number range, e.g. [11, 12] will show lines 11 and 12. Indexing at 1 to start. Setting `[start_line, -1]` shows all lines from `start_line` to the end of the file.",
+      "items": {
+        "type": "integer"
+      }
+    }
+  },
+  "required": [
+    "command",
+    "path"
+  ]
+}
+```
+
+Source: [`packages/fs/tool-str-replace-editor/src/index.ts`](../packages/fs/tool-str-replace-editor/src/index.ts)
+
+Standalone view/create/unique literal replace/line insert tool over the filesystem seam; it composes with any shell or terminal surface.
+
 ## `@deepseek-ai/dsh-tool-fs`
 
 ### `edit`

examples/jsonrpc-agent/README.i18n.yaml

@@ -2,5 +2,5 @@
 # side as of the last confirmed-consistent state. Both languages carry equal authority;
 # after editing either side, bring the other along and re-record with:
 #   pnpm run verify-translation-pairing --write examples/jsonrpc-agent/README.md
-README.md: 6ee4e9d824315bde76b7a534679f018df9a6d3e8
-README.zh.md: 43290fc3659750724679a370be5b33ffdca2a5cb
+README.md: 5e7b7d79415a4af0b0d16c61b0a4590dce57e545
+README.zh.md: 00450838e7d10ae9e95624b5f89992dd747d5440

examples/jsonrpc-agent/README.md

@@ -25,3 +25,16 @@ The surrounding runtime also loads JSONL session persistence and automatic conte
 | `DSH_SYSTEM_PROMPT` | Deployment-provided coding persona |
 
 Pass the config path through the Python SDK's `cordis` option or `DSH_CORDIS_CONFIG`. The bundled executable already carries every plugin named by this file; the target machine does not need Node.js.
+
+## Persistent tools variant
+
+[`persistent-tools.cordis.yml`](persistent-tools.cordis.yml) is a minimal runnable variant whose model-facing surface is exactly:
+
+- owner-scoped persistent `bash`
+- `str_replace_editor` with `view`, `create`, `str_replace`, and `insert`
+
+It composes the real local PTY, filesystem intent policy, and session sandbox policy. The keyless SDK snapshot drives the shipped JSON-RPC runtime through both tools, proves that shell cwd/environment survive across calls, and pins the notification stream, turn result, and persisted JSONL:
+
+```bash
+pnpm exec vitest run --config vitest.snapshot.config.ts -t persistent-tools
+```

examples/jsonrpc-agent/README.zh.md

@@ -25,3 +25,16 @@
 | `DSH_SYSTEM_PROMPT` | 由部署提供的编码人格 |
 
 通过 Python SDK 的 `cordis` 选项或 `DSH_CORDIS_CONFIG` 传入配置路径。内置可执行文件已携带此文件中指定的每个插件；目标机器无需 Node.js。
+
+## 持久工具变体
+
+[`persistent-tools.cordis.yml`](persistent-tools.cordis.yml) 是一个最小可运行变体，面向模型的能力严格只有：
+
+- agent 独占、状态持久的 `bash`
+- 提供 `view`、`create`、`str_replace` 与 `insert` 的 `str_replace_editor`
+
+它组合真实本地 PTY、文件系统 intent 策略与 session 沙箱策略。无密钥 SDK 快照会通过正式 JSON-RPC runtime 驱动这两个工具，验证 shell 的 cwd 与环境变量能跨调用保留，并锁定通知流、轮次结果与已持久化的 JSONL：
+
+```bash
+pnpm exec vitest run --config vitest.snapshot.config.ts -t persistent-tools
+```

examples/jsonrpc-agent/persistent-tools.cordis.yml

@@ -0,0 +1,58 @@
+# Minimal unattended composition for the persistent Bash and string-replace
+# editor. It is runnable through the JSON-RPC example runtime and intentionally
+# keeps the model-facing surface to exactly these two tools.
+
+- id: jsonrpc
+  name: '@deepseek-ai/dsh-jsonrpc'
+
+- id: llm-deepseek
+  name: '@deepseek-ai/dsh-llm-deepseek'
+  config:
+    apiKey: !!js process.env.DEEPSEEK_API_KEY
+    baseURL: !!js process.env.DEEPSEEK_BASE_URL
+
+- id: sandbox
+  name: '@deepseek-ai/dsh-sandbox-local'
+
+- id: sandbox-policy
+  name: '@deepseek-ai/dsh-sandbox-policy'
+  config:
+    mode: danger-full-access
+    workspaceRoot: !!js process.env.DSH_CWD ?? process.cwd()
+
+- id: pty
+  name: '@deepseek-ai/dsh-pty'
+
+- id: pty-local
+  name: '@deepseek-ai/dsh-pty-local'
+
+- id: fs-sandbox
+  name: '@deepseek-ai/dsh-fs-sandbox'
+  config:
+    cwd: !!js process.env.DSH_CWD ?? process.cwd()
+
+- id: fs-policy
+  name: '@deepseek-ai/dsh-fs-policy'
+
+- id: agent-spine
+  name: '@deepseek-ai/dsh-agent-spine-demo'
+  config:
+    includeHarnessIdentity: false
+    persona: 'You are a helpful software engineer assistant.'
+    workspaceContext: false
+    skills:
+      enabled: false
+    toolBash: false
+    toolTasks: false
+
+- id: persistent-bash
+  name: '@deepseek-ai/dsh-tool-bash-persistent'
+
+- id: str-replace-editor
+  name: '@deepseek-ai/dsh-tool-str-replace-editor'
+
+- id: sessions
+  name: '@deepseek-ai/dsh-session-persistence-jsonl'
+  config:
+    root: !!js process.env.DSH_SESSION_ROOT ?? './.sessions'
+    compression: none

examples/jsonrpc-agent/persistent-tools.snapshot.cordis.yml

@@ -0,0 +1,19 @@
+# Keyless replay keeps the persistent-tool composition intact and replaces
+# only its live DeepSeek adapter with the fixture-backed provider.
+- id: base
+  name: '@cordisjs/plugin-include'
+  config:
+    path: ./persistent-tools.cordis.yml
+    patches:
+      - id: llm-deepseek
+        name: '@deepseek-ai/dsh-llm-deepseek'
+        disabled: true
+      - insert:
+          - id: llm-replay
+            name: '@deepseek-ai/dsh-llm-replay'
+            config:
+              providers:
+                - id: deepseek
+                  name: DeepSeek
+                  models:
+                    - id: deepseek-v4-flash

examples/jsonrpc-agent/tests/sdk.snapshot.ts

@@ -11,7 +11,7 @@
 
 import { mkdir, mkdtemp, readFile, readdir, rm, writeFile } from 'node:fs/promises'
 import { tmpdir } from 'node:os'
-import { delimiter, join } from 'node:path'
+import { basename, delimiter, join } from 'node:path'
 import { fileURLToPath } from 'node:url'
 import { describe, expect, it } from 'vitest'
 import {
@@ -31,6 +31,8 @@ const testsDir = dirOf(import.meta.url)
 const snapshotsDir = join(testsDir, 'snapshots')
 const liveConfig = join(testsDir, '..', 'cordis.yml')
 const replayConfig = join(testsDir, '..', 'cordis.snapshot.yml')
+const persistentToolsLiveConfig = join(testsDir, '..', 'persistent-tools.cordis.yml')
+const persistentToolsReplayConfig = join(testsDir, '..', 'persistent-tools.snapshot.cordis.yml')
 const runtimeBin = fileURLToPath(new URL('../../../packages/examples/jsonrpc-demo/src/bin.ts', import.meta.url))
 const repoTsconfig = fileURLToPath(new URL('../../../tsconfig.json', import.meta.url))
 
@@ -51,6 +53,12 @@ interface SdkScenario {
   sessionId: string
   /** How many child sessions the turn persists (subagent scenarios). */
   children: number
+  /** Optional scenario-specific live and replay compositions. */
+  configs?: { live: string; replay: string }
+  /** Cwd-relative files whose final contents are part of the scenario contract. */
+  expectedFiles?: Readonly<Record<string, string>>
+  /** Assembled model-facing tool names and required argument keys. */
+  expectedTools?: Readonly<Record<string, readonly string[]>>
 }
 
 const SCENARIOS: SdkScenario[] = [
@@ -72,6 +80,15 @@ const SCENARIOS: SdkScenario[] = [
     sessionId: 'sdk-snapshot-subagent',
     children: 1,
   },
+  {
+    name: 'persistent-tools',
+    prompt: 'Prove that bash state persists. Then create {{cwd}}/note.txt with a tab-indented line, view it, replace that literal tab-indented line, and make the persistent shell exit with code 9.',
+    sessionId: 'persistent-tools-snapshot',
+    children: 0,
+    configs: { live: persistentToolsLiveConfig, replay: persistentToolsReplayConfig },
+    expectedFiles: { 'note.txt': 'target:\n\tnew\n' },
+    expectedTools: { bash: ['command'], str_replace_editor: ['command', 'path'] },
+  },
 ]
 
 interface PersistedLog {
@@ -80,6 +97,10 @@ interface PersistedLog {
   readonly header: Record<string, unknown>
 }
 
+interface MissingFile {
+  readonly missing: true
+}
+
 async function jsonlFiles(dir: string): Promise<string[]> {
   const entries = await readdir(dir, { recursive: true })
   return entries.filter(entry => entry.endsWith('.jsonl')).map(entry => join(dir, entry)).sort()
@@ -94,6 +115,20 @@ async function persistedLogs(sessionsRoot: string): Promise<PersistedLog[]> {
   }))
 }
 
+interface LoggedRequestHeader {
+  type?: string
+  data?: { header?: { tools?: Array<{ name: string; parameters: { required?: string[] } }> } }
+}
+
+function assembledToolRequirements(log: PersistedLog): Record<string, string[]> {
+  const event = log.content.trimEnd().split('\n')
+    .map(line => JSON.parse(line) as LoggedRequestHeader)
+    .find(candidate => candidate.type === 'request/header')
+  const tools = event?.data?.header?.tools
+  if (tools === undefined) throw new Error('session log has no request/header tools')
+  return Object.fromEntries(tools.map(tool => [tool.name, tool.parameters.required ?? []]))
+}
+
 function contextOf(logs: readonly { content: string; header: Record<string, unknown> }[], cwd: string): NormalizeContext {
   return {
     sessionIds: logs.flatMap(log => typeof log.header.id === 'string' ? [log.header.id] : []),
@@ -109,6 +144,25 @@ function contextOfContents(contents: readonly string[]): NormalizeContext {
   }
 }
 
+async function hydrateReplayFixtures(scenario: SdkScenario, cwd: string): Promise<string[]> {
+  const root = join(cwd, '.replay-fixtures')
+  await mkdir(root, { recursive: true })
+  return Promise.all(fixtureFiles(scenario).map(async (source) => {
+    const destination = join(root, basename(source))
+    await writeFile(destination, (await readFile(source, 'utf8')).replaceAll('{{cwd}}', cwd))
+    return destination
+  }))
+}
+
+async function readExpectedFile(path: string): Promise<string | MissingFile> {
+  try {
+    return await readFile(path, 'utf8')
+  } catch (error: unknown) {
+    if (error instanceof Error && (error as NodeJS.ErrnoException).code === 'ENOENT') return { missing: true }
+    throw error
+  }
+}
+
 /**
  * Normalize the SDK-visible notification stream: embedded `session.event`
  * envelopes get the session-log treatment (times zeroed, headers tokenized),
@@ -147,30 +201,30 @@ async function runScenario(scenario: SdkScenario): Promise<{
   result: TurnResult
   notifications: HarnessNotification[]
   logs: PersistedLog[]
+  observedFiles: Record<string, string | MissingFile>
   cwd: string
 }> {
   const cwd = await mkdtemp(join(tmpdir(), `sdk-snapshot-${scenario.name}-`))
   const sessionsRoot = join(cwd, '.sessions')
-  const scenarioDir = join(snapshotsDir, scenario.name)
+  const replayFixtures = recording ? [] : await hydrateReplayFixtures(scenario, cwd)
   const launch = resolveExampleLaunch({
     srcBin: runtimeBin,
     configArgs: [],
     tsconfigPath: repoTsconfig,
   })
-  const childFixtures = Array.from(
-    { length: scenario.children },
-    (_, index) => join(scenarioDir, `session.${index + 1}.jsonl`),
-  )
+  const [parentFixture, ...childFixtures] = replayFixtures
   const env: Record<string, string> = {
     ...Object.fromEntries(Object.entries(process.env).filter(([, value]) => value !== undefined)) as Record<string, string>,
     ...Object.fromEntries(Object.entries(launch.env).filter(([, value]) => value !== undefined)) as Record<string, string>,
-    DSH_CORDIS_CONFIG: recording ? liveConfig : replayConfig,
+    DSH_CORDIS_CONFIG: recording
+      ? scenario.configs?.live ?? liveConfig
+      : scenario.configs?.replay ?? replayConfig,
     DSH_SESSION_ROOT: sessionsRoot,
     DSH_CWD: cwd,
     DSH_SNAPSHOT: mode,
     NODE_OPTIONS: [process.env.NODE_OPTIONS, '--disable-warning=ExperimentalWarning'].filter(Boolean).join(' '),
-    ...recording ? {} : {
-      DSH_SNAPSHOT_FILE: join(scenarioDir, 'session.jsonl'),
+    ...parentFixture === undefined ? {} : {
+      DSH_SNAPSHOT_FILE: parentFixture,
       ...childFixtures.length > 0 ? { DSH_SNAPSHOT_CHILD_FILES: childFixtures.join(delimiter) } : {},
     },
   }
@@ -189,13 +243,19 @@ async function runScenario(scenario: SdkScenario): Promise<{
   })
   try {
     const notifications: HarnessNotification[] = []
-    const result = await harness.run(scenario.prompt, {
+    const result = await harness.run(scenario.prompt.replaceAll('{{cwd}}', cwd), {
       sessionId: scenario.sessionId,
       onNotification: (notification) => { notifications.push(notification) },
     })
     await harness.close()
     const logs = await persistedLogs(sessionsRoot)
-    return { result, notifications, logs, cwd }
+    const observedFiles = Object.fromEntries(await Promise.all(
+      Object.keys(scenario.expectedFiles ?? {}).map(async (path): Promise<[string, string | MissingFile]> => [
+        path,
+        await readExpectedFile(join(cwd, path)),
+      ]),
+    ))
+    return { result, notifications, logs, observedFiles, cwd }
   } finally {
     await harness.close()
     await rm(cwd, { recursive: true, force: true })
@@ -227,7 +287,7 @@ describe('TypeScript SDK snapshots over the jsonrpc runtime', () => {
       const notificationsExpectedPath = join(scenarioDir, 'notifications.expected.jsonl')
       const resultExpectedPath = join(scenarioDir, 'result.expected.json')
 
-      const { result, notifications, logs, cwd } = await runScenario(scenario)
+      const { result, notifications, logs, observedFiles, cwd } = await runScenario(scenario)
       const ordered = orderLogs(logs, scenario)
       const actualContext = contextOf(ordered, cwd)
 
@@ -293,6 +353,12 @@ describe('TypeScript SDK snapshots over the jsonrpc runtime', () => {
       // Wire-shape invariants that must hold in every mode.
       expect(result.status).toBe('ok')
       expect(notifications.at(-1)?.method).toBe('session.finished')
+      expect(observedFiles).toEqual(scenario.expectedFiles ?? {})
+      if (scenario.expectedTools !== undefined) {
+        const parent = ordered[0]
+        if (parent === undefined) throw new Error(`${scenario.name} has no parent session log`)
+        expect(assembledToolRequirements(parent)).toEqual(scenario.expectedTools)
+      }
       if (scenario.children > 0) {
         expect(notifications.some(n => n.method === 'subagent.started')).toBe(true)
         expect(notifications.some(n => n.method === 'subagent.finished')).toBe(true)

examples/jsonrpc-agent/tests/snapshots/persistent-tools/notifications.expected.jsonl

@@ -0,0 +1,74 @@
+{"method":"session.event","params":{"sessionId":"{{sessionId}}","event":{"type":"turn/start","seq":0,"time":0,"data":{"turn":1,"trigger":{"kind":"message","source":{"kind":"user"}}}}}}
+{"method":"session.event","params":{"sessionId":"{{sessionId}}","event":{"type":"user/message","seq":1,"time":0,"data":{"content":[{"type":"text","text":"Prove that bash state persists. Then create {{cwd}}/note.txt with a tab-indented line, view it, replace that literal tab-indented line, and make the persistent shell exit with code 9."}],"source":{"kind":"user"},"role":"user","id":"{{sessionId}}"},"surfaceOp":"append"}}}
+{"method":"session.event","params":{"sessionId":"{{sessionId}}","event":{"type":"session/title","seq":2,"time":0,"data":{"title":"Prove that bash state persists.","messageSeqs":[1],"source":{"kind":"fallback"}}}}}
+{"method":"session.event","params":{"sessionId":"{{sessionId}}","event":{"type":"step/start","seq":3,"time":0,"data":{"turn":1,"step":1}}}}
+{"method":"session.event","params":{"sessionId":"{{sessionId}}","event":{"type":"request/header","seq":4,"time":0,"data":{"header":{"config":{"provider":"deepseek","model":"deepseek-v4-flash"},"system":"{{system}}","tools":"{{tools}}"},"reason":"initial"}}}}
+{"method":"session.event","params":{"sessionId":"{{sessionId}}","event":{"type":"assistant/chunk","seq":5,"time":0,"data":{"turn":1,"step":1,"chunk":{"type":"block-start","index":0,"blockType":"tool-call"}}}}}
+{"method":"session.event","params":{"sessionId":"{{sessionId}}","event":{"type":"assistant/chunk","seq":6,"time":0,"data":{"turn":1,"step":1,"chunk":{"type":"tool-call-delta","index":0,"id":"bash-1","name":"bash","argumentsDelta":"{\"command\":\"cd /tmp && export DSH_EXAMPLE_COUNT=1 && printf \\\"COUNT=%s CWD=%s\\\\n\\\" \\\"$DSH_EXAMPLE_COUNT\\\" \\\"$PWD\\\"\"}"}}}}}
+{"method":"session.event","params":{"sessionId":"{{sessionId}}","event":{"type":"assistant/chunk","seq":7,"time":0,"data":{"turn":1,"step":1,"chunk":{"type":"block-end","index":0,"block":{"type":"tool-call","id":"bash-1","name":"bash","arguments":"{\"command\":\"cd /tmp && export DSH_EXAMPLE_COUNT=1 && printf \\\"COUNT=%s CWD=%s\\\\n\\\" \\\"$DSH_EXAMPLE_COUNT\\\" \\\"$PWD\\\"\"}"}}}}}}
+{"method":"session.event","params":{"sessionId":"{{sessionId}}","event":{"type":"assistant/chunk","seq":8,"time":0,"data":{"turn":1,"step":1,"chunk":{"type":"usage","usage":{"inputTokens":3,"outputTokens":3}}}}}}
+{"method":"session.event","params":{"sessionId":"{{sessionId}}","event":{"type":"assistant/chunk","seq":9,"time":0,"data":{"turn":1,"step":1,"chunk":{"type":"finish","reason":{"kind":"tool-calls"}}}}}}
+{"method":"session.event","params":{"sessionId":"{{sessionId}}","event":{"type":"assistant/message","seq":10,"time":0,"data":{"turn":1,"step":1,"message":{"role":"assistant","content":[{"type":"tool-call","id":"bash-1","name":"bash","arguments":"{\"command\":\"cd /tmp && export DSH_EXAMPLE_COUNT=1 && printf \\\"COUNT=%s CWD=%s\\\\n\\\" \\\"$DSH_EXAMPLE_COUNT\\\" \\\"$PWD\\\"\"}"}],"source":{"kind":"model","provider":"deepseek","model":"deepseek-v4-flash"},"id":"{{sessionId}}"},"usage":{"inputTokens":3,"outputTokens":3}},"sourceEventSeqs":[5,6,7,8,9],"surfaceOp":"append"}}}
+{"method":"session.event","params":{"sessionId":"{{sessionId}}","event":{"type":"tool/call","seq":11,"time":0,"data":{"turn":1,"step":1,"callId":"bash-1","name":"bash","arguments":"{\"command\":\"cd /tmp && export DSH_EXAMPLE_COUNT=1 && printf \\\"COUNT=%s CWD=%s\\\\n\\\" \\\"$DSH_EXAMPLE_COUNT\\\" \\\"$PWD\\\"\"}"}}}}
+{"method":"session.event","params":{"sessionId":"{{sessionId}}","event":{"type":"tool/result","seq":12,"time":0,"data":{"turn":1,"step":1,"message":{"source":{"kind":"tool","callId":"bash-1"},"content":[{"type":"tool-result","toolCallId":"bash-1","content":[{"type":"text","text":"COUNT=1 CWD=/tmp"}],"isError":false}],"role":"user","id":"{{sessionId}}"}},"sourceEventSeqs":[11],"surfaceOp":"append"}}}
+{"method":"session.event","params":{"sessionId":"{{sessionId}}","event":{"type":"step/end","seq":13,"time":0,"data":{"turn":1,"step":1}}}}
+{"method":"session.event","params":{"sessionId":"{{sessionId}}","event":{"type":"step/start","seq":14,"time":0,"data":{"turn":1,"step":2}}}}
+{"method":"session.event","params":{"sessionId":"{{sessionId}}","event":{"type":"assistant/chunk","seq":15,"time":0,"data":{"turn":1,"step":2,"chunk":{"type":"block-start","index":0,"blockType":"tool-call"}}}}}
+{"method":"session.event","params":{"sessionId":"{{sessionId}}","event":{"type":"assistant/chunk","seq":16,"time":0,"data":{"turn":1,"step":2,"chunk":{"type":"tool-call-delta","index":0,"id":"bash-2","name":"bash","argumentsDelta":"{\"command\":\"DSH_EXAMPLE_COUNT=$((DSH_EXAMPLE_COUNT + 1)); printf \\\"COUNT=%s CWD=%s\\\\n\\\" \\\"$DSH_EXAMPLE_COUNT\\\" \\\"$PWD\\\"\"}"}}}}}
+{"method":"session.event","params":{"sessionId":"{{sessionId}}","event":{"type":"assistant/chunk","seq":17,"time":0,"data":{"turn":1,"step":2,"chunk":{"type":"block-end","index":0,"block":{"type":"tool-call","id":"bash-2","name":"bash","arguments":"{\"command\":\"DSH_EXAMPLE_COUNT=$((DSH_EXAMPLE_COUNT + 1)); printf \\\"COUNT=%s CWD=%s\\\\n\\\" \\\"$DSH_EXAMPLE_COUNT\\\" \\\"$PWD\\\"\"}"}}}}}}
+{"method":"session.event","params":{"sessionId":"{{sessionId}}","event":{"type":"assistant/chunk","seq":18,"time":0,"data":{"turn":1,"step":2,"chunk":{"type":"usage","usage":{"inputTokens":3,"outputTokens":3}}}}}}
+{"method":"session.event","params":{"sessionId":"{{sessionId}}","event":{"type":"assistant/chunk","seq":19,"time":0,"data":{"turn":1,"step":2,"chunk":{"type":"finish","reason":{"kind":"tool-calls"}}}}}}
+{"method":"session.event","params":{"sessionId":"{{sessionId}}","event":{"type":"assistant/message","seq":20,"time":0,"data":{"turn":1,"step":2,"message":{"role":"assistant","content":[{"type":"tool-call","id":"bash-2","name":"bash","arguments":"{\"command\":\"DSH_EXAMPLE_COUNT=$((DSH_EXAMPLE_COUNT + 1)); printf \\\"COUNT=%s CWD=%s\\\\n\\\" \\\"$DSH_EXAMPLE_COUNT\\\" \\\"$PWD\\\"\"}"}],"source":{"kind":"model","provider":"deepseek","model":"deepseek-v4-flash"},"id":"{{sessionId}}"},"usage":{"inputTokens":3,"outputTokens":3}},"sourceEventSeqs":[15,16,17,18,19],"surfaceOp":"append"}}}
+{"method":"session.event","params":{"sessionId":"{{sessionId}}","event":{"type":"tool/call","seq":21,"time":0,"data":{"turn":1,"step":2,"callId":"bash-2","name":"bash","arguments":"{\"command\":\"DSH_EXAMPLE_COUNT=$((DSH_EXAMPLE_COUNT + 1)); printf \\\"COUNT=%s CWD=%s\\\\n\\\" \\\"$DSH_EXAMPLE_COUNT\\\" \\\"$PWD\\\"\"}"}}}}
+{"method":"session.event","params":{"sessionId":"{{sessionId}}","event":{"type":"tool/result","seq":22,"time":0,"data":{"turn":1,"step":2,"message":{"source":{"kind":"tool","callId":"bash-2"},"content":[{"type":"tool-result","toolCallId":"bash-2","content":[{"type":"text","text":"COUNT=2 CWD=/tmp"}],"isError":false}],"role":"user","id":"{{sessionId}}"}},"sourceEventSeqs":[21],"surfaceOp":"append"}}}
+{"method":"session.event","params":{"sessionId":"{{sessionId}}","event":{"type":"step/end","seq":23,"time":0,"data":{"turn":1,"step":2}}}}
+{"method":"session.event","params":{"sessionId":"{{sessionId}}","event":{"type":"step/start","seq":24,"time":0,"data":{"turn":1,"step":3}}}}
+{"method":"session.event","params":{"sessionId":"{{sessionId}}","event":{"type":"assistant/chunk","seq":25,"time":0,"data":{"turn":1,"step":3,"chunk":{"type":"block-start","index":0,"blockType":"tool-call"}}}}}
+{"method":"session.event","params":{"sessionId":"{{sessionId}}","event":{"type":"assistant/chunk","seq":26,"time":0,"data":{"turn":1,"step":3,"chunk":{"type":"tool-call-delta","index":0,"id":"editor-create","name":"str_replace_editor","argumentsDelta":"{\"command\":\"create\",\"path\":\"{{cwd}}/note.txt\",\"file_text\":\"target:\\n\\told\\n\"}"}}}}}
+{"method":"session.event","params":{"sessionId":"{{sessionId}}","event":{"type":"assistant/chunk","seq":27,"time":0,"data":{"turn":1,"step":3,"chunk":{"type":"block-end","index":0,"block":{"type":"tool-call","id":"editor-create","name":"str_replace_editor","arguments":"{\"command\":\"create\",\"path\":\"{{cwd}}/note.txt\",\"file_text\":\"target:\\n\\told\\n\"}"}}}}}}
+{"method":"session.event","params":{"sessionId":"{{sessionId}}","event":{"type":"assistant/chunk","seq":28,"time":0,"data":{"turn":1,"step":3,"chunk":{"type":"usage","usage":{"inputTokens":3,"outputTokens":3}}}}}}
+{"method":"session.event","params":{"sessionId":"{{sessionId}}","event":{"type":"assistant/chunk","seq":29,"time":0,"data":{"turn":1,"step":3,"chunk":{"type":"finish","reason":{"kind":"tool-calls"}}}}}}
+{"method":"session.event","params":{"sessionId":"{{sessionId}}","event":{"type":"assistant/message","seq":30,"time":0,"data":{"turn":1,"step":3,"message":{"role":"assistant","content":[{"type":"tool-call","id":"editor-create","name":"str_replace_editor","arguments":"{\"command\":\"create\",\"path\":\"{{cwd}}/note.txt\",\"file_text\":\"target:\\n\\told\\n\"}"}],"source":{"kind":"model","provider":"deepseek","model":"deepseek-v4-flash"},"id":"{{sessionId}}"},"usage":{"inputTokens":3,"outputTokens":3}},"sourceEventSeqs":[25,26,27,28,29],"surfaceOp":"append"}}}
+{"method":"session.event","params":{"sessionId":"{{sessionId}}","event":{"type":"tool/call","seq":31,"time":0,"data":{"turn":1,"step":3,"callId":"editor-create","name":"str_replace_editor","arguments":"{\"command\":\"create\",\"path\":\"{{cwd}}/note.txt\",\"file_text\":\"target:\\n\\told\\n\"}"}}}}
+{"method":"session.event","params":{"sessionId":"{{sessionId}}","event":{"type":"tool/result","seq":32,"time":0,"data":{"turn":1,"step":3,"message":{"source":{"kind":"tool","callId":"editor-create"},"content":[{"type":"tool-result","toolCallId":"editor-create","content":[{"type":"text","text":"New file created successfully at: {{cwd}}/note.txt"}],"isError":false}],"role":"user","id":"{{sessionId}}"}},"sourceEventSeqs":[31],"surfaceOp":"append"}}}
+{"method":"session.event","params":{"sessionId":"{{sessionId}}","event":{"type":"step/end","seq":33,"time":0,"data":{"turn":1,"step":3}}}}
+{"method":"session.event","params":{"sessionId":"{{sessionId}}","event":{"type":"step/start","seq":34,"time":0,"data":{"turn":1,"step":4}}}}
+{"method":"session.event","params":{"sessionId":"{{sessionId}}","event":{"type":"assistant/chunk","seq":35,"time":0,"data":{"turn":1,"step":4,"chunk":{"type":"block-start","index":0,"blockType":"tool-call"}}}}}
+{"method":"session.event","params":{"sessionId":"{{sessionId}}","event":{"type":"assistant/chunk","seq":36,"time":0,"data":{"turn":1,"step":4,"chunk":{"type":"tool-call-delta","index":0,"id":"editor-view","name":"str_replace_editor","argumentsDelta":"{\"command\":\"view\",\"path\":\"{{cwd}}/note.txt\"}"}}}}}
+{"method":"session.event","params":{"sessionId":"{{sessionId}}","event":{"type":"assistant/chunk","seq":37,"time":0,"data":{"turn":1,"step":4,"chunk":{"type":"block-end","index":0,"block":{"type":"tool-call","id":"editor-view","name":"str_replace_editor","arguments":"{\"command\":\"view\",\"path\":\"{{cwd}}/note.txt\"}"}}}}}}
+{"method":"session.event","params":{"sessionId":"{{sessionId}}","event":{"type":"assistant/chunk","seq":38,"time":0,"data":{"turn":1,"step":4,"chunk":{"type":"usage","usage":{"inputTokens":3,"outputTokens":3}}}}}}
+{"method":"session.event","params":{"sessionId":"{{sessionId}}","event":{"type":"assistant/chunk","seq":39,"time":0,"data":{"turn":1,"step":4,"chunk":{"type":"finish","reason":{"kind":"tool-calls"}}}}}}
+{"method":"session.event","params":{"sessionId":"{{sessionId}}","event":{"type":"assistant/message","seq":40,"time":0,"data":{"turn":1,"step":4,"message":{"role":"assistant","content":[{"type":"tool-call","id":"editor-view","name":"str_replace_editor","arguments":"{\"command\":\"view\",\"path\":\"{{cwd}}/note.txt\"}"}],"source":{"kind":"model","provider":"deepseek","model":"deepseek-v4-flash"},"id":"{{sessionId}}"},"usage":{"inputTokens":3,"outputTokens":3}},"sourceEventSeqs":[35,36,37,38,39],"surfaceOp":"append"}}}
+{"method":"session.event","params":{"sessionId":"{{sessionId}}","event":{"type":"tool/call","seq":41,"time":0,"data":{"turn":1,"step":4,"callId":"editor-view","name":"str_replace_editor","arguments":"{\"command\":\"view\",\"path\":\"{{cwd}}/note.txt\"}"}}}}
+{"method":"session.event","params":{"sessionId":"{{sessionId}}","event":{"type":"tool/result","seq":42,"time":0,"data":{"turn":1,"step":4,"message":{"source":{"kind":"tool","callId":"editor-view"},"content":[{"type":"tool-result","toolCallId":"editor-view","content":[{"type":"text","text":"Here's the content of {{cwd}}/note.txt with line numbers (which has a total of 3 lines):\n     1  target:\n     2  \told\n     3  \n"}],"isError":false}],"role":"user","id":"{{sessionId}}"}},"sourceEventSeqs":[41],"surfaceOp":"append"}}}
+{"method":"session.event","params":{"sessionId":"{{sessionId}}","event":{"type":"step/end","seq":43,"time":0,"data":{"turn":1,"step":4}}}}
+{"method":"session.event","params":{"sessionId":"{{sessionId}}","event":{"type":"step/start","seq":44,"time":0,"data":{"turn":1,"step":5}}}}
+{"method":"session.event","params":{"sessionId":"{{sessionId}}","event":{"type":"assistant/chunk","seq":45,"time":0,"data":{"turn":1,"step":5,"chunk":{"type":"block-start","index":0,"blockType":"tool-call"}}}}}
+{"method":"session.event","params":{"sessionId":"{{sessionId}}","event":{"type":"assistant/chunk","seq":46,"time":0,"data":{"turn":1,"step":5,"chunk":{"type":"tool-call-delta","index":0,"id":"editor-replace","name":"str_replace_editor","argumentsDelta":"{\"command\":\"str_replace\",\"path\":\"{{cwd}}/note.txt\",\"old_str\":\"\\told\",\"new_str\":\"\\tnew\"}"}}}}}
+{"method":"session.event","params":{"sessionId":"{{sessionId}}","event":{"type":"assistant/chunk","seq":47,"time":0,"data":{"turn":1,"step":5,"chunk":{"type":"block-end","index":0,"block":{"type":"tool-call","id":"editor-replace","name":"str_replace_editor","arguments":"{\"command\":\"str_replace\",\"path\":\"{{cwd}}/note.txt\",\"old_str\":\"\\told\",\"new_str\":\"\\tnew\"}"}}}}}}
+{"method":"session.event","params":{"sessionId":"{{sessionId}}","event":{"type":"assistant/chunk","seq":48,"time":0,"data":{"turn":1,"step":5,"chunk":{"type":"usage","usage":{"inputTokens":3,"outputTokens":3}}}}}}
+{"method":"session.event","params":{"sessionId":"{{sessionId}}","event":{"type":"assistant/chunk","seq":49,"time":0,"data":{"turn":1,"step":5,"chunk":{"type":"finish","reason":{"kind":"tool-calls"}}}}}}
+{"method":"session.event","params":{"sessionId":"{{sessionId}}","event":{"type":"assistant/message","seq":50,"time":0,"data":{"turn":1,"step":5,"message":{"role":"assistant","content":[{"type":"tool-call","id":"editor-replace","name":"str_replace_editor","arguments":"{\"command\":\"str_replace\",\"path\":\"{{cwd}}/note.txt\",\"old_str\":\"\\told\",\"new_str\":\"\\tnew\"}"}],"source":{"kind":"model","provider":"deepseek","model":"deepseek-v4-flash"},"id":"{{sessionId}}"},"usage":{"inputTokens":3,"outputTokens":3}},"sourceEventSeqs":[45,46,47,48,49],"surfaceOp":"append"}}}
+{"method":"session.event","params":{"sessionId":"{{sessionId}}","event":{"type":"tool/call","seq":51,"time":0,"data":{"turn":1,"step":5,"callId":"editor-replace","name":"str_replace_editor","arguments":"{\"command\":\"str_replace\",\"path\":\"{{cwd}}/note.txt\",\"old_str\":\"\\told\",\"new_str\":\"\\tnew\"}"}}}}
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+{"method":"session.event","params":{"sessionId":"{{sessionId}}","event":{"type":"step/end","seq":71,"time":0,"data":{"turn":1,"step":7}}}}
+{"method":"session.event","params":{"sessionId":"{{sessionId}}","event":{"type":"turn/end","seq":72,"time":0,"data":{"turn":1,"reason":{"kind":"completed"}}}}}
+{"method":"session.finished","params":{"sessionId":"{{sessionId}}","status":"ok","reason":{"kind":"completed"}}}

examples/jsonrpc-agent/tests/snapshots/persistent-tools/result.expected.json

@@ -0,0 +1 @@
+{"status":"ok","reason":{"kind":"completed"},"finalResponse":"PERSISTENT_TOOLS_OK"}

examples/jsonrpc-agent/tests/snapshots/persistent-tools/session.jsonl

@@ -0,0 +1,74 @@
+{"type":"session","version":0,"id":"persistent-tools-snapshot","createdAt":1785331618309,"cwd":"{{cwd}}","delegationDepth":0}
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+{"type":"user/message","seq":1,"time":1785331618311,"data":{"content":[{"type":"text","text":"Prove that bash state persists. Then create {{cwd}}/note.txt with a tab-indented line, view it, replace that literal tab-indented line, and make the persistent shell exit with code 9."}],"source":{"kind":"user"},"role":"user","id":"d0534fe8-a74b-4fcf-913f-d78e36f486bb"},"surfaceOp":"append"}
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examples/package.json

@@ -56,6 +56,7 @@
     "@deepseek-ai/dsh-timeout-policy": "workspace:*",
     "@deepseek-ai/dsh-token-meter": "workspace:*",
     "@deepseek-ai/dsh-tool-ask-user": "workspace:*",
+    "@deepseek-ai/dsh-tool-bash-persistent": "workspace:*",
     "@deepseek-ai/dsh-tool-cordis": "workspace:*",
     "@deepseek-ai/dsh-tool-fs": "workspace:*",
     "@deepseek-ai/dsh-tool-fs-search": "workspace:*",
@@ -64,6 +65,7 @@
     "@deepseek-ai/dsh-tool-pty": "workspace:*",
     "@deepseek-ai/dsh-tool-ralph": "workspace:*",
     "@deepseek-ai/dsh-tool-session-query": "workspace:*",
+    "@deepseek-ai/dsh-tool-str-replace-editor": "workspace:*",
     "@deepseek-ai/dsh-tool-subagent": "workspace:*",
     "@deepseek-ai/dsh-tool-todo": "workspace:*",
     "@deepseek-ai/dsh-tool-web": "workspace:*",

packages/core/system-prompt/README.i18n.yaml

@@ -2,5 +2,5 @@
 # side as of the last confirmed-consistent state. Both languages carry equal authority;
 # after editing either side, bring the other along and re-record with:
 #   pnpm run verify-translation-pairing --write packages/core/system-prompt/README.md
-README.md: 79badba0b84b27c01f25e9c31b5df78c556411ea
-README.zh.md: fb3ed08bc9ea546033acac3b577980f500ce243d
+README.md: 23bc0e8177ad2a778df9522e254bfd5e03a9871f
+README.zh.md: 1fd4febc1c15acda19e7abfca94079b9585c1972

packages/core/system-prompt/README.md

@@ -8,6 +8,7 @@ System prompt assembly registry. Plugins contribute ordered sections, tool schem
 
 | Key | Default | Meaning |
 |---|---|---|
+| `includeHarnessIdentity` | `true` | Include the fixed `You are an AI agent powered by the DeepSeek Harness SDK.` order-−100 opener. Set false only when a compatibility deployment owns the complete system prompt. |
 | `persona` | `''` | The global deployment-persona default: the ONE config-authored prompt fragment, rendered as the order-0 `deployment:persona` section unless an agent-scoped contribution shadows it. A template — complete `{{…}}` groups are interpreted strictly against the registered variables (the shipped loop registers `{{model}}`/`{{cwd}}`), with no escape syntax for literal braces yet. Empty ⇒ the section is dropped at render. |
 | `toolOrder` | — | Explicit model-facing tool order, as a list of `ToolSchema.name`s with one `'<unlisted-tools>'` rest entry (`TOOL_ORDER_REST`): listed tools take their listed position, unlisted tools land at the rest entry in lexicographic name order. Absent ⇒ plain lexicographic name order. Applied to the collected tools BEFORE the `system-prompt/assemble` waterfall — like the sections' `order` sort, it canonicalizes what the registry contributed (registration order is a plugin-load artifact), and a waterfall listener that mutates the list owns the determinism of what it emits. Misconfiguration fails loud: a list without exactly one rest entry, or with duplicates, throws at load; a listed name with no registered tool rejects every `assemble()`; a tool provider returning the reserved rest-entry name also rejects. Under the shipped loop the turn fails before any model request. Why a central list and not per-plugin weights: [Explicit model-facing tool order](../../../.agents/notes/implemented/feature/2026-07-06-explicit-tool-order.md). |
 
@@ -48,7 +49,7 @@ Design rationale: [the prompt-variables Agent Note](../../../.agents/notes/imple
 
 #### What the model sees
 
-Every assembly starts with the harness identity below, then the configured persona and ordered plugin sections after strict variable interpolation. Empty sections disappear; scoped sections and variables can shadow globals for one agent. The final `system-prompt/assemble` waterfall result is authoritative, so an expert listener's changes determine the delivered prompt and tool schemas.
+By default every assembly starts with the harness identity below, then the configured persona and ordered plugin sections after strict variable interpolation. `includeHarnessIdentity: false` omits only that fixed opener for a deployment that owns the complete compatibility persona. Empty sections disappear; scoped sections and variables can shadow globals for one agent. The final `system-prompt/assemble` waterfall result is authoritative, so an expert listener's changes determine the delivered prompt and tool schemas.
 
 ##### Harness identity
 
@@ -58,7 +59,7 @@ You are an AI agent powered by the DeepSeek Harness SDK.
 
 #### Token effect
 
-Identity is a fixed per-request cost. Persona and plugin text are repeated per request and scale with their rendered content.
+Identity is a fixed per-request cost when enabled. Persona and plugin text are repeated per request and scale with their rendered content.
 
 #### KV Cache effect
 

packages/core/system-prompt/README.zh.md

@@ -8,6 +8,7 @@
 
 | 键 | 默认值 | 含义 |
 |---|---|---|
+| `includeHarnessIdentity` | `true` | 是否包含固定的 `You are an AI agent powered by the DeepSeek Harness SDK.`、顺序为 −100 的开场白。仅当兼容部署拥有完整系统提示词时设为 false。 |
 | `persona` | `''` | 全局部署 persona 默认值：唯一由配置创作的提示词片段，渲染为顺序为 0 的 `deployment:persona` 段，除非 agent 作用域的贡献将其遮蔽。它是模板，完整的 `{{…}}` 组会严格按已注册变量解释（随附循环注册 `{{model}}`/`{{cwd}}`），目前没有表达字面量花括号的转义语法。为空 ⇒ 渲染时删除该段。 |
 | `toolOrder` | 无 | 显式的面向模型工具顺序：一个 `ToolSchema.name` 列表，包含一个 `'<unlisted-tools>'` 其余项（`TOOL_ORDER_REST`）。已列工具占据列出的位置；未列工具按名称字典序落在其余项位置。缺席 ⇒ 直接按名称字典序排列。在 `system-prompt/assemble` waterfall（瀑布式事件）之前应用于已收集工具；与段的 `order` 排序一样，它会规范化注册表贡献的内容（注册顺序是插件加载产物），而修改列表的 waterfall 监听器拥有其输出的确定性。配置错误会明确失败：列表没有恰好一个其余项或存在重复项，会在加载时抛出；已列名称没有对应已注册工具，会使每次 `assemble()` 被拒绝；工具提供方返回保留的其余项名称也会被拒绝。在随附循环下，轮次会在任何模型请求前失败。为何采用中心列表而非每插件权重，见[显式面向模型工具顺序](../../../.agents/notes/implemented/feature/2026-07-06-explicit-tool-order.md)。 |
 
@@ -48,7 +49,7 @@
 
 #### 模型看到的内容
 
-每次组装都从下方 harness 身份开始，然后在严格变量插值后追加已配置 persona 与有序插件段。空段会消失；带作用域的段和变量可以为一个 agent 遮蔽全局项。最终 `system-prompt/assemble` waterfall 结果是权威来源，因此专家监听器的变更决定交付的提示词与工具 schema。
+默认情况下，每次组装都从下方 harness 身份开始，然后在严格变量插值后追加已配置 persona 与有序插件段。`includeHarnessIdentity: false` 仅为拥有完整兼容 persona 的部署省略这个固定开场白。空段会消失；带作用域的段和变量可以为一个 agent 遮蔽全局项。最终 `system-prompt/assemble` waterfall 结果是权威来源，因此专家监听器的变更决定交付的提示词与工具 schema。
 
 ##### Harness 身份
 
@@ -58,7 +59,7 @@ You are an AI agent powered by the DeepSeek Harness SDK.
 
 #### Token 影响
 
-身份是每次请求的固定成本。Persona 与插件文本在每次请求中重复，成本随渲染内容增长。
+启用时，身份是每次请求的固定成本。Persona 与插件文本在每次请求中重复，成本随渲染内容增长。
 
 #### KV Cache 影响
 

packages/core/system-prompt/src/index.ts

@@ -145,6 +145,8 @@ function compareToolNames(a: ToolSchema, b: ToolSchema): number {
 
 /** Plugin config: the deployment-authored fragment of the system prompt (see {@link Config.persona} for its contract). */
 export interface Config {
+  /** Include the fixed DeepSeek Harness identity before the deployment persona (default true). */
+  includeHarnessIdentity?: boolean
   /**
    * Deployment-wide order-0 persona template. A scoped section named
    * `deployment:persona` shadows it; `{{variable}}` references are strict.
@@ -245,6 +247,7 @@ class PromptLayer implements ScopeLayer {
 /** Registry service for the prompt inputs assembled before each model step. */
 export class SystemPrompt extends Service {
   static Config: z<Config> = z.object({
+    includeHarnessIdentity: z.boolean().default(true),
     persona: z.string().default(''),
     // Preserve omission because an explicit empty order lacks the rest marker.
     toolOrder: z.array(z.string()).default(undefined as unknown as string[]),
@@ -260,11 +263,13 @@ export class SystemPrompt extends Service {
     super(ctx, 'systemPrompt')
     this.toolOrder = validateToolOrder(config.toolOrder)
     // Keep harness-owned openers independent of the selected loop plugin.
-    this.section({
-      name: 'harness:identity',
-      order: -100,
-      text: 'You are an AI agent powered by the DeepSeek Harness SDK.',
-    })
+    if (config.includeHarnessIdentity ?? true) {
+      this.section({
+        name: 'harness:identity',
+        order: -100,
+        text: 'You are an AI agent powered by the DeepSeek Harness SDK.',
+      })
+    }
     this.section({
       name: 'deployment:persona',
       order: 0,

packages/core/system-prompt/tests/system-prompt.spec.ts

@@ -37,6 +37,18 @@ describe('SystemPrompt', () => {
       expect(renderPrompt(await ctx.systemPrompt.assemble())).toBe(IDENTITY)
     })
 
+    it('can omit the harness identity for a deployment that owns the complete persona', async () => {
+      const ctx = new Context()
+      await ctx.plugin(SystemPrompt, {
+        includeHarnessIdentity: false,
+        persona: 'You are a helpful software engineer assistant.',
+      })
+
+      const assembly = await ctx.systemPrompt.assemble()
+      expect(assembly.sections.map(section => section.name)).toEqual(['deployment:persona'])
+      expect(renderPrompt(assembly)).toBe('You are a helpful software engineer assistant.')
+    })
+
     it('tolerates a schema-bypassing direct construction (persona omitted)', async () => {
       // ctx.plugin validates + defaults the config first; a direct construction
       // skips the schema, so the ctor's `?? ''` narrowing is what fires.

packages/core/tools/tests/gen-tool-catalog.spec.ts

@@ -23,7 +23,7 @@ describe('gen-tool-catalog collectToolCatalog', () => {
   it('boots every shipped tool package and harvests its model-facing schemas', async () => {
     const catalog = await collectToolCatalog()
     const names = catalog.flatMap(entry => entry.schemas.map(s => s.name)).sort()
-    expect(names).toEqual(['ask_user_question', 'bash', 'cordis_inspect', 'cordis_mount', 'cordis_unmount', 'create_goal', 'edit', 'exit_plan_mode', 'get_goal', 'glob', 'grep', 'lsp', 'ralph', 'read', 'run_code', 'session_event_read', 'session_event_search', 'session_event_trace', 'session_search', 'session_trace', 'skill', 'subagent', 'task_kill', 'task_list', 'task_output', 'terminal_close', 'terminal_list', 'terminal_open', 'terminal_read', 'terminal_send', 'terminal_signal', 'todo_write', 'update_goal', 'web_fetch', 'web_search', 'workflow', 'write'])
+    expect(names).toEqual(['ask_user_question', 'bash', 'bash', 'cordis_inspect', 'cordis_mount', 'cordis_unmount', 'create_goal', 'edit', 'exit_plan_mode', 'get_goal', 'glob', 'grep', 'lsp', 'ralph', 'read', 'run_code', 'session_event_read', 'session_event_search', 'session_event_trace', 'session_search', 'session_trace', 'skill', 'str_replace_editor', 'subagent', 'task_kill', 'task_list', 'task_output', 'terminal_close', 'terminal_list', 'terminal_open', 'terminal_read', 'terminal_send', 'terminal_signal', 'todo_write', 'update_goal', 'web_fetch', 'web_search', 'workflow', 'write'])
     // Every tool carries a JSON-Schema `parameters` object (what the model sees).
     for (const entry of catalog) {
       for (const schema of entry.schemas) {

packages/examples/agent-spine-demo/README.i18n.yaml

@@ -2,5 +2,5 @@
 # side as of the last confirmed-consistent state. Both languages carry equal authority;
 # after editing either side, bring the other along and re-record with:
 #   pnpm run verify-translation-pairing --write packages/examples/agent-spine-demo/README.md
-README.md: 359e7153be2f480ba3fea4b06782acdc9f89ebb9
-README.zh.md: acd8c06940b03e90e368314cd725846a2b92b656
+README.md: 6bbd99217bcdce0e8a0e8fd22a8d39d0c64224b9
+README.zh.md: 4a7e7a1b7eced9317f94eeddf2442ded9a3e0e13

packages/examples/agent-spine-demo/src/index.ts

@@ -68,9 +68,9 @@ export interface GoalConfig {
 /**
  * Bundle config: each field forwarded verbatim to the child that owns it —
  * `agents` to the agent loop (an app that pre-creates no agents, like the ACP
- * bridge, simply omits it), `persona` and `toolOrder` to the system-prompt
- * plugin (the deployment's persona section and the explicit model-facing tool
- * order), the `tools` object to the tool registry (its presentation `mode`),
+ * bridge, simply omits it), `includeHarnessIdentity`, `persona`, and `toolOrder`
+ * to the system-prompt plugin (the fixed opener, deployment persona, and explicit
+ * model-facing tool order), the `tools` object to the tool registry (its presentation `mode`),
  * `dshHome` to bash environment and local skill discovery, `sessionTitle` to
  * the fallback title service, `skills` to the
  * skill registry/local provider/tool consumer, `workspaceContext` to the
@@ -83,13 +83,16 @@ export interface GoalConfig {
  * workspace context instead requires an explicit byte budget or `false` because
  * it changes model-visible input. Producer opt-in stays producer-local:
  * `toolBash` configures bash only; independently composed producers keep their
- * own config.
+ * own config. Set `toolBash: false` when another plugin owns the model-facing
+ * `bash` name.
  */
 export interface Config {
   /** The agent-loop `agents` list (see dsh-agent-loop's `Config`). */
   agents?: AgentLoopConfig['agents']
   /** Agent-loop concurrency cap; `1` is serial. */
   maxParallelToolCalls?: AgentLoopConfig['maxParallelToolCalls']
+  /** Whether the system prompt includes the fixed Harness identity (default true). */
+  includeHarnessIdentity?: SystemPromptConfig['includeHarnessIdentity']
   /** The deployment persona (see dsh-system-prompt's `Config`). */
   persona?: SystemPromptConfig['persona']
   /** The explicit model-facing tool order (see dsh-system-prompt's `Config`). */
@@ -102,10 +105,14 @@ export interface Config {
   sessionTitle?: SessionTitleConfig
   /** Workspace-context loader controls with an explicit byte budget; set `false` for hermetic prompts. */
   workspaceContext: workspaceContext.Config | false
-  /** Skill registry, local provider, and model-facing consumer config. */
+  /**
+   * Skill registry, local provider, and model-facing consumer config.
+   * Skills use `enabled` because one nested config controls a provider stack;
+   * single model-tool plugins use `Config | false` to disable that one consumer.
+   */
   skills?: SkillConfig
-  /** Model-facing bash tool config, including this producer's background opt-in. */
-  toolBash?: toolBash.Config
+  /** Model-facing bash tool config, or false when another plugin owns `bash`. */
+  toolBash?: toolBash.Config | false
   /** Generic background-task controls; set false to keep the task service without model-facing task tools. */
   toolTasks?: toolTasks.Config | false
   /** Global enablement and package-name filters for invariant companions. */
@@ -127,7 +134,8 @@ export const SessionTitleConfigSchema: z<SessionTitleConfig> = SessionTitleServi
   .default(EXAMPLE_SESSION_TITLE_CONFIG)
 
 /** The bash-tool config schema exported for app packages that forward `toolBash`. */
-export const ToolBashConfigSchema: z<toolBash.Config> = toolBash.Config
+export const ToolBashConfigSchema: z<toolBash.Config | false> =
+  z.union([z.const(false), toolBash.Config])
 
 /** The task-control-tool config schema exported for app packages that forward `toolTasks`. */
 export const ToolTasksConfigSchema: z<toolTasks.Config> = toolTasks.Config
@@ -163,6 +171,7 @@ export const Config = z.intersect([
 export function pickSpineConfig(config: Omit<Config, 'agents'>): Omit<Config, 'agents'> {
   return {
     ...config.maxParallelToolCalls !== undefined ? { maxParallelToolCalls: config.maxParallelToolCalls } : {},
+    ...config.includeHarnessIdentity !== undefined ? { includeHarnessIdentity: config.includeHarnessIdentity } : {},
     ...config.persona !== undefined ? { persona: config.persona } : {},
     ...config.toolOrder !== undefined ? { toolOrder: config.toolOrder } : {},
     ...config.tools !== undefined ? { tools: config.tools } : {},
@@ -201,6 +210,7 @@ export function apply(ctx: Context, config: Config): void {
   ctx.plugin(SessionTitleService, config.sessionTitle ?? EXAMPLE_SESSION_TITLE_CONFIG)
   // Owner schemas resolve defaults; forward toolOrder only when explicitly set.
   ctx.plugin(SystemPrompt, {
+    includeHarnessIdentity: config.includeHarnessIdentity ?? true,
     persona: config.persona ?? '',
     ...config.toolOrder !== undefined ? { toolOrder: config.toolOrder } : {},
   })
@@ -223,7 +233,9 @@ export function apply(ctx: Context, config: Config): void {
   ctx.plugin(agentInvariant)
   ctx.plugin(scopeInvariant)
   ctx.plugin(agentLoopInvariant)
-  ctx.plugin(toolBash, Object.assign({}, config.toolBash, { dshHome }))
+  if (config.toolBash !== false) {
+    ctx.plugin(toolBash, Object.assign({}, config.toolBash, { dshHome }))
+  }
   if (config.workspaceContext !== false) {
     ctx.plugin(workspaceContext, config.workspaceContext)
   }

packages/examples/agent-spine-demo/tests/agent-core.spec.ts

@@ -4,7 +4,7 @@ import { join } from 'node:path'
 import { tmpdir } from 'node:os'
 import { Context } from 'cordis'
 import Loader from '@cordisjs/plugin-loader'
-import { TOOL_ORDER_REST } from '@deepseek-ai/dsh-system-prompt'
+import { renderPrompt, TOOL_ORDER_REST } from '@deepseek-ai/dsh-system-prompt'
 import * as agentCore from '../src/index.ts'
 import { agentEvents, type Agent } from '@deepseek-ai/dsh-agent'
 import { SessionId } from '@deepseek-ai/dsh-session'
@@ -654,9 +654,27 @@ describe('dsh-agent-spine-demo bundle', () => {
     await ctx.fiber.dispose()
   })
 
+  it('can omit the bundled bash tool and Harness identity for a compatibility deployment', async () => {
+    const ctx = await mount({
+      includeHarnessIdentity: false,
+      persona: 'You are a helpful software engineer assistant.',
+      workspaceContext: false,
+      skills: { enabled: false },
+      toolBash: false,
+      toolTasks: false,
+    }, true)
+
+    expect(ctx.tools.schemas()).toEqual([])
+    expect(renderPrompt(await ctx.systemPrompt.assemble()))
+      .toBe('You are a helpful software engineer assistant.')
+
+    await ctx.fiber.dispose()
+  })
+
   it('picks shared spine config without leaking front-door fields', () => {
     const appConfig = {
       model: 'front-door-only',
+      includeHarnessIdentity: false,
       persona: 'You are merged.',
       toolOrder: ['zulu'],
       tools: { mode: 'native' as const },
@@ -670,6 +688,7 @@ describe('dsh-agent-spine-demo bundle', () => {
     }
 
     expect(agentCore.pickSpineConfig(appConfig)).toEqual({
+      includeHarnessIdentity: appConfig.includeHarnessIdentity,
       persona: appConfig.persona,
       toolOrder: appConfig.toolOrder,
       tools: appConfig.tools,

packages/fs/README.i18n.yaml

@@ -2,5 +2,5 @@
 # side as of the last confirmed-consistent state. Both languages carry equal authority;
 # after editing either side, bring the other along and re-record with:
 #   pnpm run verify-translation-pairing --write packages/fs/README.md
-README.md: 4d954455ea920be4882530bcfe90b48a364c29b5
-README.zh.md: ed154cbbaf7c7f45c42c17799957254fee918153
+README.md: b5e0ac9d1c0c550eb372b8a66fc6358711fddc07
+README.zh.md: ee64a617aa0d9549bcaf00b20821a6d59c6673c8

packages/fs/README.md

@@ -12,6 +12,7 @@ The filesystem stack: a provider seam (text IO + atomic mutation with an optiona
 | `fs-policy/` | Policy gate plugin: observed-state + read-before-edit + version-guarded write/edit, via the `fs/*` event gate | (no service — `fs/*` listeners) |
 | `tool-fs/` | Model-facing `read`/`write`/`edit` tools AND the executor (reads via `ctx.fs`, owns read windowing, dispatches `fs/*`); preserves filesystem semantics for session-cwd-relative paths and advertises sandbox escalation fields when the mounted `ctx.fs` confines | (registers on `ctx.tools`) |
 | `tool-fs-search/` | Model-facing `glob`/`grep` discovery tools when `rg` is available on the bash executor `PATH`, backed by fixed ripgrep commands through `ctx.bash`, NOT by `ctx.fs` provider methods | (registers on `ctx.tools`) |
+| `tool-str-replace-editor/` | Model-facing `str_replace_editor` with view/create/unique literal replace/line insert operations over `ctx.fs` | (registers on `ctx.tools`) |
 
 The interface lives at `fs/fs/`. A sandboxed, remote, or project-scoped filesystem backend can replace `fs-local` without touching the seam, the policy gate, or the model-facing tool schemas — `fs-sandbox` is the first such replacement (an in-process path fence over the shared sandbox mode; see [the cross-family fs sandbox Agent Note](../../.agents/notes/implemented/feature/2026-07-14-cross-family-fs-sandbox.md)). The policy (`fs-policy/`) is a plugin that participates only through the `fs/*` event gate, not a service the tool injects — so dropping it gracefully loses the policy and leaves the unconstrained bare provider rather than breaking the tool. A deployment that loads `tool-fs/` is expected to also load it. The mode fence and the read-before-edit gate are orthogonal and compose. Discovery (`tool-fs-search/`) deliberately does NOT extend the provider seam: search is a process-backed `rg` workflow on the bash executor, so filesystem backends stay free of a universal search contract; its tools register only when that executor can find `rg`, and its results are follow-up-readable when the bash workdir and the `read` root are the same workspace (the co-located deployment its README documents).
 

packages/fs/README.zh.md

@@ -12,6 +12,7 @@
 | `fs-policy/` | 策略门禁插件：通过 `fs/*` 事件门禁提供已观察状态、编辑前读取和版本防护的写入/编辑 | （无服务，仅有 `fs/*` 监听器） |
 | `tool-fs/` | 面向模型的 `read`/`write`/`edit` 工具以及执行器（通过 `ctx.fs` 读取，拥有读取窗口逻辑，分派 `fs/*`）；为会话 cwd 相对路径保留文件系统语义，并在已挂载的 `ctx.fs` 实施约束时声明沙箱升权字段 | （注册到 `ctx.tools`） |
 | `tool-fs-search/` | 面向模型的 `glob`/`grep` 发现工具；当 `rg` 位于 bash 执行器 `PATH` 上时注册，通过 `ctx.bash` 运行固定 ripgrep 命令，而不是使用 `ctx.fs` 提供方方法 | （注册到 `ctx.tools`） |
+| `tool-str-replace-editor/` | 基于 `ctx.fs` 提供查看／创建／唯一字面量替换／按行插入的模型可见 `str_replace_editor` | （注册到 `ctx.tools`） |
 
 接口位于 `fs/fs/`。沙箱化、远程或限定项目作用域的文件系统后端可以替换 `fs-local`，而无需更改 seam、策略门禁或面向模型的工具 schema；`fs-sandbox` 是第一个这样的替代实现（基于共享沙箱模式的进程内路径围栏；见[跨能力族 fs 沙箱 Agent Note（agent 决策记录）](../../.agents/notes/implemented/feature/2026-07-14-cross-family-fs-sandbox.md)）。策略（`fs-policy/`）是一个只通过 `fs/*` 事件门禁参与的插件，不是工具注入的服务；因此移除它只会使策略失效，留下不受约束的裸提供方，而不会破坏工具。加载 `tool-fs/` 的部署也应加载该插件。模式围栏与编辑前读取门禁彼此正交，可以组合。发现（`tool-fs-search/`）有意不扩展提供方 seam：搜索是在 bash 执行器上运行 `rg`、基于进程的工作流，因此文件系统后端无需承担通用搜索契约；只有当执行器能找到 `rg` 时，其工具才会注册。如果 bash 工作目录与 `read` 根目录是同一工作区，其结果便可供后续读取，这也是其 README 所述的共置部署。
 

packages/fs/tool-str-replace-editor/README.i18n.yaml

@@ -0,0 +1,6 @@
+# Bilingual-pair consistency record (docs/i18n/README.md): the git blob hash of each
+# side as of the last confirmed-consistent state. Both languages carry equal authority;
+# after editing either side, bring the other along and re-record with:
+#   pnpm run verify-translation-pairing --write packages/fs/tool-str-replace-editor/README.md
+README.md: 97e9e0ab9ade7c7241c1aac3e2489e055d01ff8f
+README.zh.md: 48358eb3c9d81ddad6a83c4ff3ef0cf6542096b1

packages/fs/tool-str-replace-editor/README.md

@@ -0,0 +1,52 @@
+# @deepseek-ai/dsh-tool-str-replace-editor
+
+English | [中文](README.zh.md)
+
+Standalone model-facing `str_replace_editor` over `ctx.fs`. It can be composed with persistent Bash, one-shot Bash, sandboxed Bash, or another terminal surface.
+
+## Config
+
+| Key | Default | Meaning |
+|---|---:|---|
+| `maxOutputChars` | `16000` | Prefix characters retained for file and directory views. |
+| `description` | Editor command guide | Model-facing tool description. |
+
+## Tool
+
+The schema provides `view`, `create`, `str_replace`, and `insert` over absolute paths. File views use one-based line numbers and preserve content tabs, so displayed text remains valid literal replacement input; directory views omit hidden, dependency, and Python-cache entries and descend two levels. Replacement requires one unique literal match and reports errors only in the public `old_str` vocabulary. Insert follows the selected zero-based insertion boundary without adding an implicit trailing newline. Mutations preserve tabs outside the requested edit.
+
+## Model Experience
+
+### Tool schema
+
+#### What the model sees
+
+The generated [`str_replace_editor` schema](../../../docs/tool-catalog.md#deepseek-aidsh-tool-str-replace-editor), including the configured `description`. The plugin contributes no standalone system-prompt section.
+
+#### Token effect
+
+Fixed schema cost while `str_replace_editor` is visible.
+
+#### KV Cache effect
+
+Prefix-stable while the configured description and schema remain unchanged.
+
+### Tool results
+
+#### What the model sees
+
+Views return numbered text or a shallow directory listing. Calls expose file locations, and create/replace calls expose diff cards to presentation surfaces. Mutations return concise confirmations. Long views keep their prefix and append a clipping notice.
+
+#### Token effect
+
+Data-dependent and bounded by `maxOutputChars` plus the fixed clipping notice.
+
+#### KV Cache effect
+
+Append-only tool results follow the reusable request prefix.
+
+## Known Limitations and Deferred Work
+
+- Operations target UTF-8 text; binary files are unsupported.
+- `str_replace` intentionally rejects zero or multiple matches and has no `replace_all` argument.
+- Every mutation goes through `fs/write-intent` or `fs/edit-intent`, resolves the current session sandbox policy, and delegates enforcement to the mounted filesystem and policy plugins.

packages/fs/tool-str-replace-editor/README.zh.md

@@ -0,0 +1,52 @@
+# @deepseek-ai/dsh-tool-str-replace-editor
+
+[English](README.md) | 中文
+
+基于 `ctx.fs` 的独立模型可见 `str_replace_editor`。它可与持久 Bash、一次性 Bash、沙箱 Bash 或其他终端表面组合。
+
+## 配置
+
+| 键 | 默认值 | 含义 |
+|---|---:|---|
+| `maxOutputChars` | `16000` | 文件和目录查看结果保留的前缀字符数。 |
+| `description` | 编辑器命令指南 | 面向模型的工具描述。 |
+
+## 工具
+
+Schema 提供针对绝对路径的 `view`、`create`、`str_replace` 与 `insert`。文件查看使用从一开始的行号，并保留内容中的制表符，因此显示的文本仍可作为有效的字面量替换输入；目录查看忽略隐藏、依赖与 Python 缓存条目并下探两层。替换要求字面量唯一匹配，错误只使用公开的 `old_str` 词汇。插入遵循所选的零基插入边界，不会隐式补尾换行。修改操作会保留请求编辑范围之外的制表符。
+
+## 模型体验
+
+### 工具 schema
+
+#### 模型所见
+
+生成的 [`str_replace_editor` schema](../../../docs/tool-catalog.md#deepseek-aidsh-tool-str-replace-editor)，其中包含配置的 `description`。本插件不贡献独立系统提示词段。
+
+#### Token 影响
+
+`str_replace_editor` 可见时产生固定的 schema 成本。
+
+#### KV Cache 影响
+
+配置的描述与 schema 不变时前缀稳定。
+
+### 工具结果
+
+#### 模型所见
+
+查看操作返回带行号文本或浅层目录列表。调用会向展示层提供文件位置，创建/替换还会提供 diff 卡片。修改操作返回简洁确认。长查看结果保留前缀并追加截断提示。
+
+#### Token 影响
+
+随数据变化，并受 `maxOutputChars` 与固定截断提示约束。
+
+#### KV Cache 影响
+
+工具结果以追加方式位于可复用请求前缀之后。
+
+## 已知限制与延后工作
+
+- 操作面向 UTF-8 文本，不支持二进制文件。
+- `str_replace` 刻意拒绝零匹配或多匹配，且没有 `replace_all` 参数。
+- 每个修改操作都会经过 `fs/write-intent` 或 `fs/edit-intent`，解析当前 session 的沙箱策略，并交由挂载的文件系统与策略插件执行。

packages/fs/tool-str-replace-editor/package.json

@@ -0,0 +1,54 @@
+{
+  "name": "@deepseek-ai/dsh-tool-str-replace-editor",
+  "description": "Model-facing view, create, literal replace, and line insert tool over the Harness filesystem service",
+  "version": "0.0.1",
+  "private": true,
+  "type": "module",
+  "main": "lib/index.js",
+  "types": "lib/types/index.d.ts",
+  "exports": {
+    ".": {
+      "types": "./lib/types/index.d.ts",
+      "default": "./lib/index.js"
+    },
+    "./invariant": {
+      "types": "./lib/types/invariant.d.ts",
+      "default": "./lib/invariant.js"
+    },
+    "./package.json": "./package.json"
+  },
+  "files": [
+    "lib/index.js",
+    "lib/invariant.js",
+    "lib/types/**/*.d.ts",
+    "lib/types/**/*.d.ts.map",
+    "src"
+  ],
+  "license": "BSD-3-Clause",
+  "peerDependencies": {
+    "@deepseek-ai/dsh-fs": "^0.0.1",
+    "@deepseek-ai/dsh-invariants": "^0.0.1",
+    "@deepseek-ai/dsh-sandbox": "^0.0.1",
+    "@deepseek-ai/dsh-sandbox-policy": "^0.0.1",
+    "@deepseek-ai/dsh-tools": "^0.0.1",
+    "cordis": "^4.0.0-rc.7"
+  },
+  "dependencies": {
+    "schemastery": "^3.18.0"
+  },
+  "devDependencies": {
+    "@deepseek-ai/dsh-agent": "workspace:^",
+    "@deepseek-ai/dsh-fs": "workspace:^",
+    "@deepseek-ai/dsh-fs-local": "workspace:^",
+    "@deepseek-ai/dsh-fs-policy": "workspace:^",
+    "@deepseek-ai/dsh-fs-sandbox": "workspace:^",
+    "@deepseek-ai/dsh-invariants": "workspace:^",
+    "@deepseek-ai/dsh-llm": "workspace:^",
+    "@deepseek-ai/dsh-sandbox": "workspace:^",
+    "@deepseek-ai/dsh-sandbox-policy": "workspace:^",
+    "@deepseek-ai/dsh-session": "workspace:^",
+    "@deepseek-ai/dsh-system-prompt": "workspace:^",
+    "@deepseek-ai/dsh-tools": "workspace:^",
+    "cordis": "^4.0.0-rc.7"
+  }
+}

packages/fs/tool-str-replace-editor/src/index.ts

@@ -0,0 +1,522 @@
+/**
+ * Model-facing `str_replace_editor` over the Harness filesystem seam.
+ * @module @deepseek-ai/dsh-tool-str-replace-editor
+ */
+
+import { isAbsolute } from 'node:path'
+import type { Context } from 'cordis'
+import z from 'schemastery'
+import { FsError } from '@deepseek-ai/dsh-fs'
+import type { FsInfo, FsTarget, FsWriteIntent } from '@deepseek-ai/dsh-fs'
+import { sandboxDenialMarker } from '@deepseek-ai/dsh-sandbox'
+import type { SandboxExecutionPolicy } from '@deepseek-ai/dsh-sandbox'
+import type { SandboxPolicyService } from '@deepseek-ai/dsh-sandbox-policy'
+import { defineTool } from '@deepseek-ai/dsh-tools'
+import type { ToolCallView, ToolRunContext } from '@deepseek-ai/dsh-tools'
+
+const TRUNCATED_MESSAGE = '<response clipped><NOTE>To save on context only part of this file has been shown to you. You should retry this tool after you have searched inside the file with `grep -n` in order to find the line numbers of what you are looking for.</NOTE>'
+
+const DEFAULT_DESCRIPTION = `
+Custom editing tool for viewing, creating and editing files
+* State is persistent across command calls and discussions with the user
+* If \`path\` is a file, \`view\` displays the result of applying \`cat -n\`. If \`path\` is a directory, \`view\` lists non-hidden files and directories up to 2 levels deep
+* The \`create\` command cannot be used if the specified \`path\` already exists as a file
+* If a \`command\` generates a long output, it will be truncated and marked with \`<response clipped>\`
+
+Notes for using the \`str_replace\` command:
+* The \`old_str\` parameter should match EXACTLY one or more consecutive lines from the original file. Be mindful of whitespaces!
+* If the \`old_str\` parameter is not unique in the file, the replacement will not be performed. Make sure to include enough context in \`old_str\` to make it unique
+* The \`new_str\` parameter should contain the edited lines that should replace the \`old_str\`
+`.trim()
+
+function maybeTruncate(content: string, maxOutputChars: number): string {
+  return content.length <= maxOutputChars
+    ? content
+    : content.slice(0, maxOutputChars) + TRUNCATED_MESSAGE
+}
+
+function codepointCompare(left: string, right: string): number {
+  return left < right ? -1 : left > right ? 1 : 0
+}
+
+function matchOffsets(content: string, search: string): number[] {
+  const offsets: number[] = []
+  let offset = 0
+  while (true) {
+    const match = content.indexOf(search, offset)
+    if (match < 0) return offsets
+    offsets.push(match)
+    offset = match + search.length
+  }
+}
+
+function lineNumbersAt(content: string, offsets: readonly number[]): number[] {
+  let line = 1
+  let cursor = 0
+  return offsets.map((offset) => {
+    while (cursor < offset) {
+      if (content[cursor] === '\n') line += 1
+      cursor += 1
+    }
+    return line
+  })
+}
+
+class MutationPolicy {
+  private readonly policy: SandboxPolicyService | undefined
+
+  constructor(ctx: Context) {
+    this.policy = ctx.fs.sandboxMode === undefined ? undefined : ctx.get('sandboxPolicy')
+    if (ctx.fs.sandboxMode !== undefined && this.policy === undefined) {
+      throw new Error('tool-str-replace-editor: the mounted filesystem confines but ctx.sandboxPolicy is missing')
+    }
+  }
+
+  resolve(exec: ToolRunContext): SandboxExecutionPolicy | undefined {
+    return this.policy?.resolve({
+      ...exec.agent === undefined ? {} : { session: exec.agent.session },
+    })
+  }
+
+  mapError(error: unknown, policy: SandboxExecutionPolicy | undefined): unknown {
+    if (!(error instanceof FsError) || error.code !== 'FS_SANDBOX_DENIED') return error
+    const mode = (policy as SandboxExecutionPolicy).mode
+    return new FsError(sandboxDenialMarker(mode), 'FS_SANDBOX_DENIED', { cause: error })
+  }
+}
+
+async function resolveTarget(
+  ctx: Context,
+  path: string,
+  signal: AbortSignal,
+): Promise<FsTarget> {
+  if (path.trim().length === 0) throw new Error('path must be a non-empty string')
+  if (!isAbsolute(path)) {
+    throw new Error(`The path ${path} is not an absolute path, it should start with \`/\`. Maybe you meant /${path}?`)
+  }
+  return ctx.fs.resolve(path, { signal })
+}
+
+async function statExisting(
+  ctx: Context,
+  target: FsTarget,
+  command: 'view' | 'str_replace' | 'insert',
+  exec: ToolRunContext,
+): Promise<FsInfo> {
+  const info = await ctx.fs.stat(target, exec.signal)
+  if (info === undefined) {
+    throw new FsError(
+      `The path ${target.displayPath} does not exist. Please provide a valid path.`,
+      'FS_NOT_FOUND',
+    )
+  }
+  if (info.type === 'directory' && command !== 'view') {
+    throw new FsError(
+      `The path ${target.displayPath} is a directory and only the \`view\` command can be used on directories`,
+      'FS_NOT_REGULAR_FILE',
+    )
+  }
+  return info
+}
+
+function requiredForCommand(
+  value: string | undefined,
+  parameter: string,
+  command: string,
+  allowEmpty = true,
+): string {
+  if (value === undefined) throw new Error(`Parameter \`${parameter}\` is required for command: ${command}`)
+  if (!allowEmpty && value.length === 0) {
+    throw new Error(`Parameter \`${parameter}\` is empty for command: ${command}`)
+  }
+  return value
+}
+
+function formatFileView(
+  path: string,
+  content: string,
+  maxOutputChars: number,
+  viewRange?: number[],
+): string {
+  const allLines = content.split('\n')
+  let lines = allLines
+  let initialLine = 1
+  let finalLine: number | undefined
+  let prompt = `Here's the content of ${path} with line numbers (which has a total of ${allLines.length} lines)`
+  if (viewRange !== undefined) {
+    const [requestedInitialLine, requestedFinalLine] = viewRange
+    if (
+      viewRange.length !== 2
+      || requestedInitialLine === undefined
+      || requestedFinalLine === undefined
+      || !viewRange.every(Number.isInteger)
+    ) {
+      throw new Error('Invalid `view_range`. It should be a list of two integers.')
+    }
+    initialLine = requestedInitialLine
+    finalLine = requestedFinalLine
+    if (initialLine < 1 || initialLine > allLines.length) {
+      throw new Error(
+        `Invalid \`view_range\`: [${viewRange.join(', ')}]. Its first element \`${initialLine}\` should be within the range of lines of the file: [1, ${allLines.length}]`,
+      )
+    }
+    if (finalLine > allLines.length) {
+      throw new Error(
+        `Invalid \`view_range\`: [${viewRange.join(', ')}]. Its second element \`${finalLine}\` should be smaller than the number of lines in the file: \`${allLines.length}\``,
+      )
+    }
+    if (finalLine !== -1 && finalLine < initialLine) {
+      throw new Error(
+        `Invalid \`view_range\`: [${viewRange.join(', ')}]. Its second element \`${finalLine}\` should be larger or equal than its first \`${initialLine}\``,
+      )
+    }
+    lines = finalLine === -1
+      ? allLines.slice(initialLine - 1)
+      : allLines.slice(initialLine - 1, finalLine)
+    prompt += ` with view_range=[${initialLine}, ${finalLine}]`
+  }
+  const numbered = lines
+    .map((line, index) => `${String(initialLine + index).padStart(6, ' ')}  ${line}`)
+    .join('\n')
+  return maybeTruncate(`${prompt}:\n${numbered}\n`, maxOutputChars)
+}
+
+async function listDirectory(
+  ctx: Context,
+  target: FsTarget,
+  maxOutputChars: number,
+  exec: ToolRunContext,
+): Promise<string> {
+  async function visit(dir: FsTarget, depth: number): Promise<string[]> {
+    const entries = await ctx.fs.listDir(dir, exec.signal)
+    const rows: string[] = []
+    for (const entry of entries.filter(candidate =>
+      !candidate.name.startsWith('.')
+      && candidate.name !== 'node_modules'
+      && candidate.name !== '__pycache__')) {
+      const type = entry.type === 'directory' ? 'd' : entry.type === 'file' ? 'f' : '?'
+      rows.push(`${type}\t${entry.target.displayPath}`)
+      if (entry.type === 'directory' && depth < 2) {
+        rows.push(...await visit(entry.target, depth + 1))
+      }
+    }
+    return rows
+  }
+  const rows = [`d\t${target.displayPath}`, ...await visit(target, 1)]
+  rows.sort((left, right) => {
+    const leftPath = left.slice(left.indexOf('\t') + 1)
+    const rightPath = right.slice(right.indexOf('\t') + 1)
+    return codepointCompare(leftPath, rightPath)
+  })
+  const listing = maybeTruncate(rows.join('\n') + '\n', maxOutputChars)
+  return `Here're the files and directories up to 2 levels deep in ${target.displayPath}, excluding hidden items, node_modules, and Python cache directories:\n${listing}\n`
+}
+
+async function viewPath(
+  ctx: Context,
+  path: string,
+  viewRange: number[] | undefined,
+  maxOutputChars: number,
+  exec: ToolRunContext,
+): Promise<string> {
+  const target = await resolveTarget(ctx, path, exec.signal)
+  const info = await statExisting(ctx, target, 'view', exec)
+  if (info.type === 'directory') {
+    if (viewRange !== undefined) {
+      throw new Error('The `view_range` parameter is not allowed when `path` points to a directory.')
+    }
+    return listDirectory(ctx, target, maxOutputChars, exec)
+  }
+  if (info.type !== 'file') {
+    throw new FsError(`cannot view "${target.displayPath}": not a regular file or directory`, 'FS_NOT_REGULAR_FILE')
+  }
+  const content = await ctx.fs.readText(target, exec.signal)
+  ctx.emit('fs/observed', target, info.version, exec)
+  return formatFileView(target.displayPath, content, maxOutputChars, viewRange)
+}
+
+async function createFile(
+  ctx: Context,
+  policy: MutationPolicy,
+  path: string,
+  fileText: string | undefined,
+  exec: ToolRunContext,
+): Promise<string> {
+  const content = requiredForCommand(fileText, 'file_text', 'create')
+  const sandboxPolicy = policy.resolve(exec)
+  const target = await resolveTarget(ctx, path, exec.signal)
+  if (await ctx.fs.stat(target, exec.signal) !== undefined) {
+    throw new Error(`File already exists at: ${target.displayPath}. Cannot overwrite files using command \`create\`.`)
+  }
+  const intent = await ctx.waterfall(
+    'fs/write-intent',
+    target,
+    exec,
+    () => ({ kind: 'createIfAbsent' } as const),
+  )
+  let outcome
+  try {
+    outcome = await ctx.fs.writeText(
+      target,
+      content,
+      intent,
+      exec.signal,
+      sandboxPolicy,
+    )
+  } catch (error: unknown) {
+    throw policy.mapError(error, sandboxPolicy)
+  }
+  ctx.emit('fs/observed', target, outcome.version, exec)
+  return `New file created successfully at: ${target.displayPath}`
+}
+
+async function replaceInFile(
+  ctx: Context,
+  policy: MutationPolicy,
+  path: string,
+  oldStr: string | undefined,
+  newStr: string | undefined,
+  exec: ToolRunContext,
+): Promise<string> {
+  const sandboxPolicy = policy.resolve(exec)
+  const target = await resolveTarget(ctx, path, exec.signal)
+  const intent = await ctx.waterfall('fs/edit-intent', target, exec, () => undefined)
+  const oldValue = requiredForCommand(oldStr, 'old_str', 'str_replace', false)
+  const newValue = newStr ?? ''
+  const info = await statExisting(ctx, target, 'str_replace', exec)
+  if (info.type !== 'file') {
+    throw new FsError(`cannot edit "${target.displayPath}": not a regular file`, 'FS_NOT_REGULAR_FILE')
+  }
+  const before = await ctx.fs.readText(target, exec.signal)
+  const offsets = matchOffsets(before, oldValue)
+  const offset = offsets[0]
+  if (offset === undefined) {
+    throw new FsError(
+      `No replacement was performed, old_str \`${oldValue}\` did not appear verbatim in ${target.displayPath}.`,
+      'FS_EDIT_NOT_FOUND',
+    )
+  }
+  if (offsets.length > 1) {
+    const lines = lineNumbersAt(before, offsets)
+    throw new FsError(
+      `No replacement was performed. Multiple occurrences of old_str \`${oldValue}\` in lines [${lines.join(', ')}]. Please ensure it is unique`,
+      'FS_AMBIGUOUS_EDIT',
+    )
+  }
+  let outcome
+  try {
+    outcome = await ctx.fs.writeText(
+      target,
+      before.slice(0, offset) + newValue + before.slice(offset + oldValue.length),
+      intent === undefined
+        ? { kind: 'replaceIfVersion', version: info.version }
+        : { kind: 'replaceIfVersion', version: intent.version },
+      exec.signal,
+      sandboxPolicy,
+    )
+  } catch (error: unknown) {
+    throw policy.mapError(error, sandboxPolicy)
+  }
+  ctx.emit('fs/observed', target, outcome.version, exec)
+  return `The file ${target.displayPath} has been edited successfully.`
+}
+
+async function insertInFile(
+  ctx: Context,
+  policy: MutationPolicy,
+  path: string,
+  insertLine: number | undefined,
+  newStr: string | undefined,
+  exec: ToolRunContext,
+): Promise<string> {
+  if (insertLine === undefined) throw new Error('Parameter `insert_line` is required for command: insert')
+  const value = requiredForCommand(newStr, 'new_str', 'insert')
+  const sandboxPolicy = policy.resolve(exec)
+  const target = await resolveTarget(ctx, path, exec.signal)
+  const intent = await ctx.waterfall('fs/edit-intent', target, exec, () => undefined)
+  const info = await statExisting(ctx, target, 'insert', exec)
+  if (info.type !== 'file') {
+    throw new FsError(`cannot insert into "${target.displayPath}": not a regular file`, 'FS_NOT_REGULAR_FILE')
+  }
+  const before = await ctx.fs.readText(target, exec.signal)
+  const lines = before.split('\n')
+  if (!Number.isInteger(insertLine) || insertLine < 0 || insertLine > lines.length) {
+    throw new Error(
+      `Invalid \`insert_line\` parameter: ${insertLine}. It should be within the range of lines of the file: [0, ${lines.length}]`,
+    )
+  }
+  const after = [
+    ...lines.slice(0, insertLine),
+    ...value.split('\n'),
+    ...lines.slice(insertLine),
+  ].join('\n')
+  const expected: FsWriteIntent = intent === undefined
+    ? { kind: 'replaceIfVersion', version: info.version }
+    : { kind: 'replaceIfVersion', version: intent.version }
+  let outcome
+  try {
+    outcome = await ctx.fs.writeText(target, after, expected, exec.signal, sandboxPolicy)
+  } catch (error: unknown) {
+    throw policy.mapError(error, sandboxPolicy)
+  }
+  ctx.emit('fs/observed', target, outcome.version, exec)
+  return `The file ${target.displayPath} has been edited successfully.`
+}
+
+interface ResolvedConfig {
+  maxOutputChars: number
+  description: string
+}
+
+function presentEditorCall(args: {
+  command: 'view' | 'create' | 'str_replace' | 'insert'
+  path: string
+  file_text?: string
+  insert_line?: number
+  new_str?: string
+  old_str?: string
+}): ToolCallView {
+  switch (args.command) {
+    case 'view':
+      return {
+        card: 'generic',
+        title: `view ${args.path}`,
+        kind: 'read',
+        locations: [{ path: args.path }],
+      }
+    case 'create':
+      return {
+        card: 'diff',
+        title: `create ${args.path}`,
+        diffs: [{ path: args.path, oldText: null, newText: args.file_text ?? '' }],
+        locations: [{ path: args.path }],
+      }
+    case 'str_replace':
+      return {
+        card: 'diff',
+        title: `str_replace ${args.path}`,
+        diffs: [{
+          path: args.path,
+          oldText: args.old_str ?? null,
+          newText: args.new_str ?? '',
+        }],
+        locations: [{ path: args.path }],
+      }
+    case 'insert':
+      return {
+        card: 'generic',
+        title: `insert ${args.path}`,
+        kind: 'edit',
+        locations: [{
+          path: args.path,
+          ...args.insert_line === undefined ? {} : { line: Math.max(1, args.insert_line + 1) },
+        }],
+      }
+  }
+}
+
+/** Register the model-facing `str_replace_editor` tool. */
+function registerStrReplaceEditor(ctx: Context, config: ResolvedConfig): void {
+  const policy = new MutationPolicy(ctx)
+  ctx.tools.register(defineTool({
+    name: 'str_replace_editor',
+    description: config.description,
+    parameters: {
+      command: {
+        type: 'string',
+        required: true,
+        enum: ['view', 'create', 'str_replace', 'insert'],
+        description: 'The commands to run. Allowed options are: `view`, `create`, `str_replace`, `insert`.',
+      },
+      path: {
+        type: 'string',
+        required: true,
+        description: 'Absolute path to file or directory, e.g. `/repo/file.py` or `/repo`.',
+      },
+      file_text: {
+        type: 'string',
+        description: 'Required parameter of `create` command, with the content of the file to be created.',
+      },
+      insert_line: {
+        type: 'integer',
+        description: 'Required parameter of `insert` command. The `new_str` will be inserted AFTER the line `insert_line` of `path`.',
+      },
+      new_str: {
+        type: 'string',
+        description: 'Optional parameter of `str_replace` command containing the new string (if not given, no string will be added). Required parameter of `insert` command containing the string to insert.',
+      },
+      old_str: {
+        type: 'string',
+        description: 'Required parameter of `str_replace` command containing the string in `path` to replace.',
+      },
+      view_range: {
+        type: 'array',
+        items: { type: 'integer' },
+        description: 'Optional parameter of `view` command when `path` points to a file. If none is given, the full file is shown. If provided, the file will be shown in the indicated line number range, e.g. [11, 12] will show lines 11 and 12. Indexing at 1 to start. Setting `[start_line, -1]` shows all lines from `start_line` to the end of the file.',
+      },
+    },
+    output: {
+      schema: { type: 'string' },
+      render: (_args, value) => [{ type: 'text', text: value }],
+    },
+    async execute(args, exec) {
+      switch (args.command) {
+        case 'view':
+          return viewPath(ctx, args.path, args.view_range, config.maxOutputChars, exec)
+        case 'create':
+          return createFile(ctx, policy, args.path, args.file_text, exec)
+        case 'str_replace':
+          return replaceInFile(
+            ctx,
+            policy,
+            args.path,
+            args.old_str,
+            args.new_str,
+            exec,
+          )
+        case 'insert':
+          return insertInFile(
+            ctx,
+            policy,
+            args.path,
+            args.insert_line,
+            args.new_str,
+            exec,
+          )
+      }
+    },
+    presentCall: presentEditorCall,
+  }))
+}
+
+export const name = 'tool-str-replace-editor'
+export const inject = ['tools', 'fs']
+
+/** Configuration for the string-replacement editor tool. */
+export interface Config {
+  /** Maximum returned view characters before clipping (default 16000). */
+  maxOutputChars?: number
+  /** Model-facing tool description. */
+  description?: string
+}
+
+/** Runtime configuration schema for the string-replacement editor tool. */
+export const Config: z<Config> = z.object({
+  maxOutputChars: z.number().default(16_000),
+  description: z.string().default(DEFAULT_DESCRIPTION),
+})
+
+/** Register one `str_replace_editor` tool over `ctx.fs`. */
+export function apply(ctx: Context, config: Config): void {
+  const resolved: ResolvedConfig = {
+    maxOutputChars: config.maxOutputChars ?? 16_000,
+    description: config.description ?? DEFAULT_DESCRIPTION,
+  }
+  if (!Number.isSafeInteger(resolved.maxOutputChars) || resolved.maxOutputChars <= 0) {
+    throw new Error('tool-str-replace-editor: maxOutputChars must be a positive safe integer')
+  }
+  if (resolved.description.trim().length === 0) {
+    throw new Error('tool-str-replace-editor: description must be non-empty')
+  }
+  registerStrReplaceEditor(ctx, resolved)
+}

packages/fs/tool-str-replace-editor/src/invariant.ts

@@ -0,0 +1,30 @@
+/**
+ * Package-owned invariant companion for `@deepseek-ai/dsh-tool-str-replace-editor`.
+ * @module @deepseek-ai/dsh-tool-str-replace-editor/invariant
+ */
+
+/* jscpd:ignore-start */
+import type { Context } from 'cordis'
+import type { InvariantInstaller } from '@deepseek-ai/dsh-invariants'
+
+const PACKAGE_NAME = '@deepseek-ai/dsh-tool-str-replace-editor'
+
+/** Cordis companion plugin name. */
+export const name = 'tool-str-replace-editor-invariant'
+/** Service required before the companion can reserve package ownership. */
+export const inject = ['invariants']
+
+/**
+ * No runtime invariant: the tool adapter owns no independent durable state;
+ * filesystem mutation relations stay with the provider and policy plugins.
+ */
+const install: InvariantInstaller = () => {}
+
+/**
+ * Register this package's invariant companion.
+ * @param ctx - Cordis context carrying the invariant service.
+ * @returns the installed registration's disposer after setup succeeds.
+ */
+export const apply = (ctx: Context): Promise<() => void> =>
+  Promise.resolve(ctx.invariants.register(PACKAGE_NAME, install))
+/* jscpd:ignore-end */

packages/fs/tool-str-replace-editor/tests/tools.spec.ts

@@ -0,0 +1,547 @@
+import { mkdtemp, mkdir, readFile, rm, writeFile } from 'node:fs/promises'
+import { tmpdir } from 'node:os'
+import { join } from 'node:path'
+import { afterEach, describe, expect, it } from 'vitest'
+import { Context } from 'cordis'
+import { FsVersion } from '@deepseek-ai/dsh-fs'
+import { CallId } from '@deepseek-ai/dsh-llm'
+import { Session, SessionId } from '@deepseek-ai/dsh-session'
+import AgentRegistry from '@deepseek-ai/dsh-agent'
+import type { Agent } from '@deepseek-ai/dsh-agent'
+import LocalFileSystem from '@deepseek-ai/dsh-fs-local'
+import * as FsPolicy from '@deepseek-ai/dsh-fs-policy'
+import SandboxedFileSystem from '@deepseek-ai/dsh-fs-sandbox'
+import SandboxPolicy from '@deepseek-ai/dsh-sandbox-policy'
+import SystemPrompt from '@deepseek-ai/dsh-system-prompt'
+import ToolRegistry from '@deepseek-ai/dsh-tools'
+import * as ToolStrReplaceEditor from '@deepseek-ai/dsh-tool-str-replace-editor'
+
+const contexts: Context[] = []
+const roots: string[] = []
+let callNumber = 0
+
+afterEach(async () => {
+  for (const ctx of contexts.splice(0)) await ctx.fiber.dispose()
+  for (const root of roots.splice(0)) await rm(root, { recursive: true, force: true })
+})
+
+function agent(ctx: Context, cwd: string): Agent {
+  const id = SessionId(`str-replace-editor-owner-${callNumber}`)
+  const scope = ctx.plugin(() => {})
+  const value: Agent = {
+    id,
+    options: {},
+    session: new Session(id, [], { version: 0, id, createdAt: 0, cwd }),
+    status: 'idle',
+    acceptsNextStep: false,
+    ctx: scope.ctx,
+    followup: () => {},
+    steer: () => {},
+    inject: () => {},
+    send: () => {},
+    updateInbox: () => 'not-found',
+    cancel() {},
+    whenIdle: () => Promise.resolve(),
+  }
+  ctx.agents.register(value)
+  return value
+}
+
+function text(result: { content: { type: string; text?: string }[] }): string {
+  return result.content.filter(block => block.type === 'text').map(block => block.text).join('')
+}
+
+function call(ctx: Context, owner: Agent | undefined, args: unknown) {
+  return ctx.tools.execute({
+    signal: new AbortController().signal,
+    callId: CallId(`str-replace-editor-${++callNumber}`),
+    name: 'str_replace_editor',
+    arguments: args,
+    ...owner === undefined ? {} : { agent: owner },
+  })
+}
+
+async function setup(
+  config: ToolStrReplaceEditor.Config = {},
+  options: { fsPolicy?: boolean; sandboxMode?: 'read-only' | 'workspace-write' | 'danger-full-access' } = {},
+) {
+  const root = await mkdtemp(join(tmpdir(), 'dsh-tool-str-replace-editor-'))
+  roots.push(root)
+  const ctx = new Context()
+  contexts.push(ctx)
+  await ctx.plugin(SystemPrompt)
+  await ctx.plugin(ToolRegistry)
+  await ctx.plugin(AgentRegistry)
+  if (options.sandboxMode === undefined) {
+    await ctx.plugin(LocalFileSystem, { cwd: root })
+  } else {
+    await ctx.plugin(SandboxPolicy, { mode: options.sandboxMode, workspaceRoot: root })
+    await ctx.plugin(SandboxedFileSystem, { cwd: root })
+  }
+  if (options.fsPolicy === true) await ctx.plugin(FsPolicy)
+  const fiber = await ctx.plugin(ToolStrReplaceEditor, config)
+  return { ctx, root, fiber, owner: agent(ctx, root) }
+}
+
+describe('tool-str-replace-editor', () => {
+  it('registers the standalone schema and configurable description', async () => {
+    const { ctx, fiber } = await setup({ description: 'custom editor description' })
+    const schema = ctx.tools.schemas()[0]
+    expect(ctx.tools.schemas().map(item => item.name)).toEqual(['str_replace_editor'])
+    expect(schema?.description).toBe('custom editor description')
+    const properties = (schema?.parameters as {
+      properties: Record<string, { type?: string; items?: { type?: string } }>
+    }).properties
+    expect(properties).not.toHaveProperty('replace_all')
+    expect(properties.insert_line?.type).toBe('integer')
+    expect(properties.view_range?.items?.type).toBe('integer')
+    expect(ctx.tools.get('str_replace_editor')?.presentCall?.({
+      command: 'view',
+      path: '/workspace/a.txt',
+    })).toMatchObject({
+      card: 'generic',
+      kind: 'read',
+      locations: [{ path: '/workspace/a.txt' }],
+    })
+    expect(ctx.tools.get('str_replace_editor')?.presentCall?.({
+      command: 'create',
+      path: '/workspace/a.txt',
+      file_text: 'hello',
+    })).toMatchObject({
+      card: 'diff',
+      diffs: [{ path: '/workspace/a.txt', oldText: null, newText: 'hello' }],
+    })
+    expect(ctx.tools.get('str_replace_editor')?.presentCall?.({
+      command: 'str_replace',
+      path: '/workspace/a.txt',
+      old_str: 'old',
+      new_str: 'new',
+    })).toMatchObject({
+      card: 'diff',
+      diffs: [{ path: '/workspace/a.txt', oldText: 'old', newText: 'new' }],
+    })
+    expect(ctx.tools.get('str_replace_editor')?.presentCall?.({
+      command: 'insert',
+      path: '/workspace/a.txt',
+      insert_line: 0,
+      new_str: 'x',
+    })).toMatchObject({
+      card: 'generic',
+      kind: 'edit',
+      locations: [{ path: '/workspace/a.txt', line: 1 }],
+    })
+    expect(ctx.tools.get('str_replace_editor')?.presentCall?.({
+      command: 'create',
+      path: '/workspace/empty.txt',
+    })).toMatchObject({
+      diffs: [{ path: '/workspace/empty.txt', oldText: null, newText: '' }],
+    })
+    expect(ctx.tools.get('str_replace_editor')?.presentCall?.({
+      command: 'str_replace',
+      path: '/workspace/a.txt',
+    })).toMatchObject({
+      diffs: [{ path: '/workspace/a.txt', oldText: null, newText: '' }],
+    })
+    expect(ctx.tools.get('str_replace_editor')?.presentCall?.({
+      command: 'insert',
+      path: '/workspace/a.txt',
+    })).toMatchObject({
+      locations: [{ path: '/workspace/a.txt' }],
+    })
+
+    await fiber.dispose()
+    expect(ctx.tools.schemas()).toEqual([])
+    expect(ctx.tools.get('str_replace_editor')).toBeUndefined()
+  })
+
+  it('creates, views, replaces, and inserts with the canonical model-facing output', async () => {
+    const { ctx, root, owner } = await setup()
+    const sample = join(root, 'sample.txt')
+    expect(text(await call(ctx, owner, {
+      command: 'create',
+      path: sample,
+      file_text: 'one\ntwo\nthree\n',
+    }))).toBe(`New file created successfully at: ${sample}`)
+
+    expect(text(await call(ctx, owner, {
+      command: 'view',
+      path: sample,
+      view_range: [2, -1],
+    }))).toBe([
+      `Here's the content of ${sample} with line numbers (which has a total of 4 lines) with view_range=[2, -1]:`,
+      '     2  two',
+      '     3  three',
+      '     4  ',
+      '',
+    ].join('\n'))
+
+    expect(text(await call(ctx, owner, {
+      command: 'str_replace',
+      path: sample,
+      old_str: 'two',
+      new_str: 'TWO',
+    }))).toBe(`The file ${sample} has been edited successfully.`)
+    expect(text(await call(ctx, owner, {
+      command: 'str_replace',
+      path: sample,
+      old_str: 'TWO',
+    }))).toBe(`The file ${sample} has been edited successfully.`)
+    expect(text(await call(ctx, owner, {
+      command: 'insert',
+      path: sample,
+      insert_line: 1,
+      new_str: 'between',
+    }))).toBe(`The file ${sample} has been edited successfully.`)
+    expect(await readFile(sample, 'utf8')).toBe('one\nbetween\n\nthree\n')
+  })
+
+  it('writes replacement text literally', async () => {
+    const { ctx, root, owner } = await setup()
+    const sample = join(root, 'literal.txt')
+    const replacement = "$&|$`|$'|$$"
+    await writeFile(sample, 'before OLD after')
+
+    expect((await call(ctx, owner, {
+      command: 'str_replace',
+      path: sample,
+      old_str: 'OLD',
+      new_str: replacement,
+    })).isError).toBe(false)
+    expect(await readFile(sample, 'utf8')).toBe(`before ${replacement} after`)
+  })
+
+  it('lists visible entries to depth two and clips at the configured view limit', async () => {
+    const { ctx, root, owner } = await setup({ maxOutputChars: 10_000 })
+    await mkdir(join(root, 'dir', 'nested', 'third'), { recursive: true })
+    await mkdir(join(root, 'dir', 'node_modules', 'pkg'), { recursive: true })
+    await mkdir(join(root, 'dir', 'node_modules_old'), { recursive: true })
+    await mkdir(join(root, 'dir', '__pycache__'), { recursive: true })
+    await mkdir(join(root, 'dir', '__pycache__backup'), { recursive: true })
+    await writeFile(join(root, 'dir', 'visible.txt'), 'ok')
+    await writeFile(join(root, 'dir', '.hidden'), 'hidden')
+    await writeFile(join(root, 'dir', 'nested', 'child.txt'), 'child')
+    await writeFile(join(root, 'dir', 'nested', 'third', 'too-deep.txt'), 'deep')
+    await writeFile(join(root, 'dir', 'node_modules', 'pkg', 'index.js'), 'hidden dependency')
+    await writeFile(join(root, 'dir', 'node_modules_old', 'kept.js'), 'visible source')
+    await writeFile(join(root, 'dir', '__pycache__', 'module.pyc'), 'cache')
+    await writeFile(join(root, 'dir', '__pycache__backup', 'kept.py'), 'visible source')
+    const listDir = ctx.fs.listDir.bind(ctx.fs)
+    const otherTarget = await ctx.fs.resolve(join(root, 'dir', 'other'))
+    ctx.fs.listDir = async (target, signal) => {
+      const entries = await listDir(target, signal)
+      return target.displayPath === join(root, 'dir')
+        ? [
+          { name: 'same-target', type: 'other', target: otherTarget },
+          { name: 'other', type: 'other', target: otherTarget },
+          ...entries.toReversed(),
+        ]
+        : entries
+    }
+
+    const listing = text(await call(ctx, owner, { command: 'view', path: join(root, 'dir') }))
+    expect(listing).not.toContain('.hidden')
+    expect(listing).not.toContain('too-deep.txt')
+    expect(listing).not.toContain('index.js')
+    expect(listing).not.toContain('module.pyc')
+    expect(listing).toContain('node_modules_old/kept.js')
+    expect(listing).toContain('__pycache__backup/kept.py')
+
+    const clipped = await setup({ maxOutputChars: 10 })
+    await writeFile(join(clipped.root, 'large.txt'), 'x'.repeat(100))
+    expect(text(await call(clipped.ctx, clipped.owner, {
+      command: 'view',
+      path: join(clipped.root, 'large.txt'),
+    })))
+      .toContain('<response clipped>')
+  })
+
+  it('matches canonical empty-line, range, and end-insert behavior', async () => {
+    const { ctx, root, owner } = await setup()
+    const empty = join(root, 'empty.txt')
+    const newline = join(root, 'newline.txt')
+    const plain = join(root, 'plain.txt')
+    await writeFile(empty, '')
+    await writeFile(newline, '\n')
+    await writeFile(plain, 'one\ntwo')
+
+    expect(text(await call(ctx, owner, { command: 'view', path: empty })))
+      .toContain('(which has a total of 1 lines):\n     1  \n')
+    expect(text(await call(ctx, owner, { command: 'view', path: newline })))
+      .toContain('(which has a total of 2 lines):\n     1  \n     2  \n')
+    expect(text(await call(ctx, owner, {
+      command: 'view',
+      path: plain,
+      view_range: [1, 2],
+    }))).toContain('     2  two')
+    expect(text(await call(ctx, undefined, {
+      command: 'view',
+      path: plain,
+    }))).toContain('     1  one')
+    expect((await call(ctx, undefined, {
+      command: 'create',
+      path: join(root, 'ownerless.txt'),
+      file_text: 'ownerless',
+    })).isError).toBe(false)
+
+    await call(ctx, owner, {
+      command: 'insert',
+      path: plain,
+      insert_line: 2,
+      new_str: 'three',
+    })
+    expect(await readFile(plain, 'utf8')).toBe('one\ntwo\nthree')
+
+    await writeFile(newline, 'one\n')
+    await call(ctx, owner, {
+      command: 'insert',
+      path: newline,
+      insert_line: 2,
+      new_str: 'three',
+    })
+    expect(await readFile(newline, 'utf8')).toBe('one\n\nthree')
+  })
+
+  it('uses old_str-only replacement failures and rejects relative paths', async () => {
+    const { ctx, root, owner } = await setup()
+    const ambiguous = join(root, 'ambiguous.txt')
+    await writeFile(ambiguous, 'same\nother\nsame')
+
+    const missing = await call(ctx, owner, {
+      command: 'str_replace',
+      path: ambiguous,
+      old_str: 'absent',
+      new_str: 'x',
+    })
+    expect(missing.isError).toBe(true)
+    expect(text(missing)).toContain(`old_str \`absent\` did not appear verbatim in ${ambiguous}`)
+    expect(text(missing)).not.toContain('old_string')
+
+    const repeated = await call(ctx, owner, {
+      command: 'str_replace',
+      path: ambiguous,
+      old_str: 'same',
+      new_str: 'x',
+    })
+    expect(repeated.isError).toBe(true)
+    expect(text(repeated)).toContain('Multiple occurrences of old_str `same` in lines [1, 3]')
+    expect(text(repeated)).not.toContain('replace_all')
+
+    await writeFile(ambiguous, 'alpha\nbeta\nmiddle\nalpha\nbeta')
+    const repeatedMultiline = await call(ctx, owner, {
+      command: 'str_replace',
+      path: ambiguous,
+      old_str: 'alpha\nbeta',
+      new_str: 'x',
+    })
+    expect(text(repeatedMultiline))
+      .toContain('Multiple occurrences of old_str `alpha\nbeta` in lines [1, 4]')
+
+    const mixedEol = join(root, 'mixed-eol.txt')
+    await writeFile(mixedEol, 'alpha\r\nbeta\nmiddle\nalpha\nbeta')
+    expect((await call(ctx, owner, {
+      command: 'str_replace',
+      path: mixedEol,
+      old_str: 'alpha\r\nbeta',
+      new_str: 'replaced',
+    })).isError).toBe(false)
+    expect(await readFile(mixedEol, 'utf8')).toBe('replaced\nmiddle\nalpha\nbeta')
+
+    const relative = await call(ctx, owner, { command: 'view', path: 'ambiguous.txt' })
+    expect(relative.isError).toBe(true)
+    expect(text(relative)).toContain('is not an absolute path')
+    expect(await readFile(ambiguous, 'utf8')).toBe('alpha\nbeta\nmiddle\nalpha\nbeta')
+  })
+
+  it('reports invalid commands or arguments without mutating files', async () => {
+    const { ctx, root, owner } = await setup()
+    const ambiguous = join(root, 'ambiguous.txt')
+    const empty = join(root, 'empty.txt')
+    const trailingNewline = join(root, 'trailing-newline.txt')
+    const threeLines = join(root, 'three-lines.txt')
+    const directory = join(root, 'directory')
+    await writeFile(ambiguous, 'same same')
+    await writeFile(empty, '')
+    await writeFile(trailingNewline, 'one\n')
+    await writeFile(threeLines, 'one\ntwo\nthree')
+    await mkdir(directory)
+
+    const cases = [
+      { command: 'view', path: '' },
+      { command: 'view', path: join(root, 'missing.txt') },
+      { command: 'view', path: ambiguous, view_range: [1] },
+      { command: 'view', path: ambiguous, view_range: [0, 1] },
+      { command: 'view', path: ambiguous, view_range: [1.5, 2] },
+      { command: 'view', path: threeLines, view_range: [1, 99] },
+      { command: 'view', path: threeLines, view_range: [2, 1] },
+      { command: 'view', path: directory, view_range: [1, 1] },
+      { command: 'create', path: join(root, 'new.txt') },
+      { command: 'create', path: ambiguous, file_text: 'overwrite' },
+      { command: 'str_replace', path: ambiguous, new_str: 'x' },
+      { command: 'str_replace', path: ambiguous, old_str: '', new_str: 'x' },
+      { command: 'insert', path: ambiguous, new_str: 'x' },
+      { command: 'insert', path: ambiguous, insert_line: -1, new_str: 'x' },
+      { command: 'insert', path: ambiguous, insert_line: 1.5, new_str: 'x' },
+      { command: 'insert', path: ambiguous, insert_line: 99, new_str: 'x' },
+      { command: 'insert', path: empty, insert_line: 2, new_str: 'x' },
+      { command: 'insert', path: directory, insert_line: 0, new_str: 'x' },
+    ]
+    for (const args of cases) {
+      expect((await call(ctx, owner, args)).isError).toBe(true)
+    }
+    expect(await readFile(ambiguous, 'utf8')).toBe('same same')
+
+    ctx.fs.stat = async () => ({ version: FsVersion('special'), type: 'other' })
+    const special = await call(ctx, owner, { command: 'view', path: join(root, 'special') })
+    expect(special.isError).toBe(true)
+    expect(special.error).toMatchObject({ info: { code: 'FS_NOT_REGULAR_FILE' } })
+    expect((await call(ctx, owner, {
+      command: 'str_replace',
+      path: join(root, 'special'),
+      old_str: 'x',
+      new_str: 'y',
+    })).error).toMatchObject({ info: { code: 'FS_NOT_REGULAR_FILE' } })
+    expect((await call(ctx, owner, {
+      command: 'insert',
+      path: join(root, 'special'),
+      insert_line: 0,
+      new_str: 'x',
+    })).error).toMatchObject({ info: { code: 'FS_NOT_REGULAR_FILE' } })
+  })
+
+  it('delegates read-before-edit decisions to fs-policy', async () => {
+    const { ctx, root, owner } = await setup({}, { fsPolicy: true })
+    const existing = join(root, 'existing.txt')
+    const created = join(root, 'created.txt')
+    await writeFile(existing, 'before')
+
+    const blindEdit = await call(ctx, owner, {
+      command: 'str_replace',
+      path: existing,
+      old_str: 'before',
+      new_str: 'after',
+    })
+    expect(blindEdit.error).toMatchObject({ info: { code: 'FS_NOT_OBSERVED' } })
+    expect(await readFile(existing, 'utf8')).toBe('before')
+
+    await call(ctx, owner, { command: 'view', path: existing })
+    expect((await call(ctx, owner, {
+      command: 'str_replace',
+      path: existing,
+      old_str: 'before',
+      new_str: 'after',
+    })).isError).toBe(false)
+    expect(await readFile(existing, 'utf8')).toBe('after')
+
+    expect((await call(ctx, owner, {
+      command: 'insert',
+      path: existing,
+      insert_line: 1,
+      new_str: 'tail',
+    })).isError).toBe(false)
+    expect(await readFile(existing, 'utf8')).toBe('after\ntail')
+
+    expect((await call(ctx, owner, {
+      command: 'create',
+      path: created,
+      file_text: 'new',
+    })).isError).toBe(false)
+    expect(await readFile(created, 'utf8')).toBe('new')
+  })
+
+  it('passes the session sandbox policy to every mutation', async () => {
+    const { ctx, root, owner } = await setup({}, { sandboxMode: 'read-only' })
+    const path = join(root, 'blocked.txt')
+    const result = await call(ctx, owner, {
+      command: 'create',
+      path,
+      file_text: 'blocked',
+    })
+    expect(result.error).toMatchObject({ info: { code: 'FS_SANDBOX_DENIED' } })
+    expect(text(result)).toContain('[sandbox: file access denied under read-only mode]')
+
+    const ownerless = await call(ctx, undefined, {
+      command: 'create',
+      path: join(root, 'ownerless-blocked.txt'),
+      file_text: 'blocked',
+    })
+    expect(ownerless.error).toMatchObject({ info: { code: 'FS_SANDBOX_DENIED' } })
+  })
+
+  it('preserves tabs outside the edited region', async () => {
+    const { ctx, root, owner } = await setup()
+    const path = join(root, 'Makefile')
+    await writeFile(path, 'target:\n\told\nremove\n')
+    expect(text(await call(ctx, owner, { command: 'view', path })))
+      .toContain('     2  \told')
+    await call(ctx, owner, {
+      command: 'str_replace',
+      path,
+      old_str: '\told',
+      new_str: '\tnew',
+    })
+    await call(ctx, owner, {
+      command: 'str_replace',
+      path,
+      old_str: 'remove\n',
+    })
+    await call(ctx, owner, {
+      command: 'insert',
+      path,
+      insert_line: 1,
+      new_str: '\tkept',
+    })
+    expect(await readFile(path, 'utf8')).toBe('target:\n\tkept\n\tnew\n')
+  })
+
+  it('reports missing sandbox-policy composition during plugin startup', async () => {
+    const root = await mkdtemp(join(tmpdir(), 'dsh-tool-str-replace-editor-missing-policy-'))
+    roots.push(root)
+    const ctx = new Context()
+    contexts.push(ctx)
+    await ctx.plugin(SystemPrompt)
+    await ctx.plugin(ToolRegistry)
+    await ctx.plugin(AgentRegistry)
+    await ctx.plugin(LocalFileSystem, { cwd: root })
+    Object.defineProperty(ctx.fs, 'sandboxMode', { value: 'read-only' })
+
+    await expect(ctx.plugin(ToolStrReplaceEditor))
+      .rejects.toThrow('the mounted filesystem confines but ctx.sandboxPolicy is missing')
+  })
+
+  it('maps unexpected backend write failures for replace and insert', async () => {
+    const { ctx, root, owner } = await setup()
+    const path = join(root, 'backend-error.txt')
+    await writeFile(path, 'old\n')
+    const failWrite = async (): Promise<never> => {
+      throw new Error('backend write failed')
+    }
+    ctx.fs.writeText = failWrite
+
+    const replace = await call(ctx, owner, {
+      command: 'str_replace',
+      path,
+      old_str: 'old',
+      new_str: 'new',
+    })
+    expect(replace.isError).toBe(true)
+    expect(text(replace)).toContain('backend write failed')
+
+    const insert = await call(ctx, owner, {
+      command: 'insert',
+      path,
+      insert_line: 1,
+      new_str: 'new',
+    })
+    expect(insert.isError).toBe(true)
+    expect(text(insert)).toContain('backend write failed')
+  })
+
+  it('rejects invalid plugin config', () => {
+    expect(() => {
+      ToolStrReplaceEditor.apply(new Context(), { maxOutputChars: 0 })
+    }).toThrow('maxOutputChars must be a positive safe integer')
+    expect(() => {
+      ToolStrReplaceEditor.apply(new Context(), { description: ' ' })
+    }).toThrow('description must be non-empty')
+  })
+})

packages/fs/tool-str-replace-editor/tsconfig.json

@@ -0,0 +1,16 @@
+{
+  "extends": "../../../tsconfig.base.json",
+  "compilerOptions": {
+    "rootDir": "src",
+    "outDir": "lib/types"
+  },
+  "include": ["src"],
+  "references": [
+    { "path": "../../../vendor/cordis" },
+    { "path": "../../core/tools" },
+    { "path": "../fs" },
+    { "path": "../../sandbox/sandbox" },
+    { "path": "../../sandbox/sandbox-policy" },
+    { "path": "../../support/invariants" }
+  ]
+}

packages/host/directory-picker-browse/README.i18n.yaml

@@ -2,5 +2,5 @@
 # side as of the last confirmed-consistent state. Both languages carry equal authority;
 # after editing either side, bring the other along and re-record with:
 #   pnpm run verify-translation-pairing --write packages/host/directory-picker-browse/README.md
-README.md: 318380405214d5f25ad77e348c4e134a8981ffb3
-README.zh.md: 2f88f64cc2974b8535e34eb9798f512ea109b754
+README.md: 52b5fe7e89f915be3b50324628e9d5c48f1ef94c
+README.zh.md: 742da39470083887a71ddba4a7c8012f0ce0ea1f

packages/host/directory-picker-browse/README.md

@@ -6,7 +6,7 @@ The **in-app browsing backend** of the [directory-picker seam](../directory-pick
 
 Behavior facts: listings return **directories only**, name-sorted, with symlinks-to-directories followed (broken/cyclic links skipped — the probe `stat` failing means "not enterable") and a host-owned `hidden` flag (POSIX dot convention) left for the client to act on; `crumbs` is the root-to-target ancestor chain, the root crumb labeled by its full path (`/`, `C:\`); an absent `list` path means the host account's home directory. `createDirectory` is non-recursive (a missing parent is a real failure, not a level to invent) and validates the name as a single non-blank segment even when called directly, mirroring the wire schema's fence. Both primitives reject an explicit path that is not fully qualified — relative forms, and on Windows the rooted drive-less forms (`\foo`, `/foo`) and incomplete UNC prefixes (`\\`, `\\server`) that `isAbsolute` accepts — with `directory-unreadable`/`directory-create-failed`, instead of letting `resolve` rebase it under the host process cwd or current drive. One `list` call returns at most `maxEntries` rows (config, default 1000 — the bound GitHub's web UI applies to directory listings), and the level streams through a bounded window so memory stays O(maxEntries) no matter how many children the directory holds: a cut level keeps the name-sorted head, counts hidden rows against the bound, probes only windowed candidates, and reports `truncated: true` so the client can say the level is incomplete (a windowed broken symlink is not backfilled from beyond the window — the eviction already marks the level truncated); window insertion is binary with an O(1) full-window tail rejection, and `list` threads the caller's `AbortSignal` so a disconnect or timeout stops the scan instead of letting it outlive the caller. Failures throw the seam's typed `DirectoryPickerError`. Policy rationale: [the directory-picker capability seam Agent Note](../../../.agents/notes/implemented/architecture/2026-07-28-directory-picker-capability-seam.md).
 
-**Dual-face package**: the browser half (`./client`) fills [ui-workspace's](../../client/ui-workspace/README.md) two directory-flow holes with the in-app **Select Workspace Directory** dialog (figma `Harness` 813-23126 family — Miller two-column view, breadcrumb with a click-to-edit path zone, nested New-folder dialog), driving `host.listDirectory`/`host.createDirectory` and registering its own locale namespace (`directory-browser`, zh default / en). One cordis.yml row therefore composes both sides of the browse interaction; the client carries no capability-kind branching, and mounting a second flow package fails at load (the holes are `single` kind).
+**Dual-face package**: the browser half (`./client`) fills [ui-workspace's](../../client/ui-workspace/README.md) two directory-flow holes with the in-app **Select Workspace Directory** dialog (figma `Harness` 813-23126 family — Miller two-column view whose navigations land selection-anchored and quiet: the previous view keeps rendering while a crumb jump or a submitted path is scanned (a "Loading…" pill floats over it only once the scan outlives a 300ms silence window, never shifting the columns), then target and parent legs land as one two-pane frame with the target re-selected as its actual parent-level entry — so stepping back never collapses and no intermediate frame flashes (a parent leg outliving its 200ms wait bound lands the target alone and upgrades in place; a failed or truncated parent leg keeps the single-pane landing; the display root keeps the single wide level); breadcrumb with a click-to-edit path zone whose editor seeds a trailing separator, prefix-filters the listed level from the draft's final segment while typing (case-insensitively, over the listed — possibly truncated — rows only; Enter still navigates by the exact text), and cancels on Escape or when focus leaves the dialog card (window/tab switches and in-card focus moves keep the draft); a fixed-label show-hidden footer toggle over the host's `hidden` flags, with a dot-led typed prefix revealing its matches and the current selection exempt from both filters; nested New-folder dialog), driving `host.listDirectory`/`host.createDirectory` and registering its own locale namespace (`directory-browser`, zh default / en). One cordis.yml row therefore composes both sides of the browse interaction; the client carries no capability-kind branching, and mounting a second flow package fails at load (the holes are `single` kind).
 
 ## Model Experience
 

packages/host/directory-picker-browse/README.zh.md

@@ -6,7 +6,7 @@
 
 行为事实：列举**只返回目录**、按名称排序，指向目录的符号链接会被跟随（断链／循环链接被跳过——探测 `stat` 失败即"不可进入"），并携带宿主判定的 `hidden` 标志（POSIX 点前缀约定），展示决策留给客户端；`crumbs` 是从根到目标的祖先链，根 crumb 以完整路径标注（`/`、`C:\`）；`list` 不带路径即列举宿主账户的家目录。`createDirectory` 不递归（父目录缺失是真实失败，不是要补造的层级），且即便被直接调用也把名称校验为单个非空段，与协议 schema 的栅栏一致。两个原语都拒绝非完全限定的显式路径——相对形态，以及 Windows 上 `isAbsolute` 会放行的无盘符有根形态（`\foo`、`/foo`）与不完整的 UNC 前缀（`\\`、`\\server`）——报 `directory-unreadable`／`directory-create-failed`，而不是任由 `resolve` 把它重定位到宿主进程 cwd 或当前盘符之下。单次 `list` 至多返回 `maxEntries` 行（配置项，默认 1000——GitHub 网页端对目录列举采用的同一上限），且层级以流式方式经过一个有界窗口，无论目录有多少子项内存都保持 O(maxEntries)：被截断的层级保留按名排序的头部、隐藏行计入上限、只探测窗口内候选，并报告 `truncated: true`，供客户端提示层级不完整（窗口内的断链符号链接不会从窗口外回填——发生过驱逐本身已把层级标记为截断）；窗口插入为二分查找、满窗尾部单次比较即拒绝，且 `list` 透传调用方的 `AbortSignal`，断连或超时会停止扫描而不是让它在调用方离开后继续。失败抛出 seam 的类型化 `DirectoryPickerError`。策略依据：[目录选择能力 seam Agent Note](../../../.agents/notes/implemented/architecture/2026-07-28-directory-picker-capability-seam.md)。
 
-**双面包**：browser half（`./client`）以应用内 **选择工作区目录** 对话框（figma `Harness` 813-23126 家族——Miller 双列视图、带点击即编辑路径区的面包屑、嵌套新建文件夹对话框）填入 [ui-workspace](../../client/ui-workspace/README.md) 的两个目录流洞，驱动 `host.listDirectory`／`host.createDirectory`，并注册自己的 locale 命名空间（`directory-browser`，zh 默认／en）。因此一行 cordis.yml 同时组合浏览交互的两侧；client 侧不含任何能力 kind 分支，挂载第二个流程包会在加载期失败（洞为 `single` kind）。
+**双面包**：browser half（`./client`）以应用内 **选择工作区目录** 对话框（figma `Harness` 813-23126 家族——Miller 双列视图，其导航以选中项为锚、安静落地：扫描 crumb 跳转或提交的路径期间，先前视图持续渲染（"Loading…" 胶囊仅在扫描超出 300ms 静默窗口后才浮于其上，绝不挪动各列），随后目标与父层级两程以单个双栏帧落地，目标被重新选中为其在父层级中的实际条目——因此后退绝不塌缩，也没有中间帧闪现（父层级这一程超出其 200ms 等待上限时，目标单独落地，随后就地升级；父层级这一程失败或被截断时保持单栏落地；展示根保持单个宽层级）；带点击即编辑路径区的面包屑，其编辑器预填尾随分隔符、输入时以草稿末段对所列层级做前缀过滤（不区分大小写，且仅作用于已列出、可能被截断的行；Enter 仍按确切文本导航）、按 Escape 或焦点离开对话框卡片即取消（窗口／标签页切换与卡片内焦点移动保留草稿）；基于宿主 `hidden` 标志、标签固定的"显示隐藏"footer 开关，键入以点开头的前缀会显出其匹配项，且当前选中项不受这两种过滤影响；嵌套新建文件夹对话框）填入 [ui-workspace](../../client/ui-workspace/README.md) 的两个目录流洞，驱动 `host.listDirectory`／`host.createDirectory`，并注册自己的 locale 命名空间（`directory-browser`，zh 默认／en）。因此一行 cordis.yml 同时组合浏览交互的两侧；client 侧不含任何能力 kind 分支，挂载第二个流程包会在加载期失败（洞为 `single` kind）。
 
 ## 模型体验
 

packages/host/directory-picker-browse/src/client/DirectoryBrowser.module.css

@@ -1,6 +1,7 @@
 /* Directory-browser dialog (figma 813-23126 family). The shared Modal renders
  * headless here — mask, card, Escape only — and this module owns the figma
- * frame: 600×420 card (viewport-clamped), header (title + crumbs, l3 separator),
+ * frame: 680×500 card (viewport-clamped; upsized from the figma 600×420),
+ * header (title + crumbs, l3 separator),
  * the one-or-two-column Miller content, and the bordered footer. */
 
 /* Doubled class beats Modal's own .dialog regardless of stylesheet order. */
@@ -8,19 +9,32 @@
  * columns scroll, so shrinking the height keeps Open/Cancel reachable
  * instead of clipping them below a fixed overlay. */
 .dialog.dialog {
-  width: min(600px, 100%);
-  height: min(420px, calc(100dvh - 32px));
+  width: min(680px, 100%);
+  height: min(500px, calc(100dvh - 32px));
   padding: 0;
   gap: 0;
+  /* The Modal card is an l2 surface and the columns below scroll on it:
+   * rebind the scrollbar indirection to the elevation pair here, on the
+   * surface, so it inherits down to whichever descendant scrolls (the
+   * rebinding contract in ui-theme styles/scrollbar.css). */
+  --dsh-scrollbar-thumb: var(--dsw-alias-scrollbar-bg-l2);
+  --dsh-scrollbar-thumb-hover: var(--dsw-alias-scrollbar-hover-l2);
 }
 
-/* Header block: pl24 pr14 pt22 pb12, 8px between title row and crumb row. */
+/* Card-scope wrapper hosting the path editor's Escape and focus-leave
+ * observers; display:contents keeps header/content/footer as direct flex
+ * children of the Modal card. */
+.editorScope {
+  display: contents;
+}
+
+/* Header block: pl24 pr14 pt16 pb8, 8px between title row and crumb row. */
 .header {
   display: flex;
   flex-direction: column;
   gap: 8px;
   flex: none;
-  padding: 22px 14px 12px 24px;
+  padding: 16px 14px 8px 24px;
   border-bottom: 1px solid var(--dsw-alias-border-l3);
 }
 
@@ -54,8 +68,12 @@
   align-items: stretch;
   flex: 1 1 0;
   min-height: 0;
-  gap: 20px;
+  /* 12px of row gap on each side of the divider; the left side reads wider
+   * by the column's trailing 8px scrollbar clearance, which is deliberate —
+   * the thumb needs that room, the right pane's rows do not. */
+  gap: 12px;
   overflow-x: auto;
+  scrollbar-width: none;
 }
 
 .crumbTrail {
@@ -126,28 +144,36 @@
   color: var(--dsw-alias-label-primary);
 }
 
-/* Miller content: pt16 px24; columns are 256 wide (or full width solo) with
- * the hairline divider centered between them; each column scrolls alone. */
+/* Miller content: symmetric 16px vertical padding so the divider clears the
+ * header and footer rules evenly; each column scrolls alone (column widths
+ * live at .column). */
 .content {
   display: flex;
   flex-direction: column;
   flex: 1 1 0;
   min-height: 0;
-  padding: 16px 24px 0;
+  /* Anchors the floating loading pill (.loadingFloat). */
+  position: relative;
+  /* Right inset is slimmer than the left: the trailing column's own 8px
+   * scrollbar clearance makes up the optical difference. */
+  padding: 16px 16px 16px 24px;
 }
 
+/* Columns split the row evenly around the divider (a solo column takes the
+ * whole row); 256px is the floor below which the row scrolls (scrollbar
+ * hidden, the effect pins the child pane into view) instead of squeezing
+ * the panes. */
 .column {
   display: flex;
   flex-direction: column;
   gap: 2px;
-  width: 256px;
-  flex: none;
-  overflow-y: auto;
-}
-
-.columnWide {
-  width: 100%;
   flex: 1 1 0;
+  min-width: 256px;
+  overflow-y: auto;
+  /* The themed scrollbar occupies the column's edge (styled scrollbars are
+   * classic, gutter-taking ones); the extra clearance keeps the row pills
+   * clear of the thumb. */
+  padding-right: 8px;
 }
 
 .divider {
@@ -216,6 +242,10 @@
 .status,
 .error {
   padding: 4px;
+  /* The loading pill occupies the opposite corner while a stale status stays
+   * visible. Reserve its widest localized footprint so wrapped text cannot
+   * run underneath it on a narrow card. */
+  padding-right: 120px;
   font-size: 12px;
   line-height: 18px;
 }
@@ -228,8 +258,25 @@
   color: var(--dsw-alias-state-error-primary);
 }
 
-/* Footer: l3 separator on top, pt12 px24, New-folder pinned left; the fixed
- * card leaves the figma 28px below the 36px buttons. */
+/* The slow-scan indicator floats over the content's bottom-RIGHT corner on
+ * the card background instead of occupying a row: a scan must never shift
+ * the columns' height, and the stale view keeps rendering beneath it (it
+ * only appears at all once a scan outlives SLOW_SCAN_DELAY_MS). Right,
+ * not left: the truncated/error status rows flow at the bottom LEFT and
+ * stay on screen through a scan, with their reserved right padding keeping
+ * both legible even on a narrow card. After .status in the cascade — the
+ * element carries both classes and this padding must win the
+ * same-specificity race. */
+.loadingFloat {
+  position: absolute;
+  right: 16px;
+  bottom: 8px;
+  padding: 2px 8px;
+  background: var(--dsw-alias-bg-layer-2);
+}
+
+/* Footer: l3 separator on top, symmetric padding so the row sits vertically
+ * centered in the bar; New-folder and the show-hidden toggle pin left. */
 .footerBar {
   display: flex;
   align-items: center;
@@ -238,10 +285,42 @@
   flex-wrap: wrap;
   gap: 8px;
   flex: none;
-  padding: 12px 24px 28px;
+  padding: 16px 24px;
   border-top: 1px solid var(--dsw-alias-border-l3);
 }
 
+/* Show-hidden toggle: a subtle fixed-label text button left of the gap;
+ * the pressed state seats a check glyph after the label (Menu's selected
+ * vocabulary; trailing so the label never shifts) instead of flipping the
+ * wording. */
+.showHiddenToggle {
+  display: inline-flex;
+  align-items: center;
+  gap: 4px;
+  border: none;
+  background: transparent;
+  padding: 0;
+  font-size: 13px;
+  line-height: 20px;
+  font-weight: 500;
+  color: var(--dsw-alias-label-secondary);
+  cursor: pointer;
+  white-space: nowrap;
+}
+
+.showHiddenToggle:hover {
+  color: var(--dsw-alias-label-primary);
+}
+
+.showHiddenToggle:disabled {
+  color: var(--dsw-alias-label-caption);
+  cursor: default;
+}
+
+.showHiddenToggleActive {
+  color: var(--dsw-alias-label-primary);
+}
+
 .footerGap {
   flex: 1 1 0;
 }

packages/host/directory-picker-browse/src/client/DirectoryBrowser.tsx

@@ -1,22 +1,32 @@
 /**
  * The in-app workspace-directory browser (figma Harness 813-23126 family): a
- * 600×420 dialog (clamped to short/narrow viewports — the Miller row scrolls
+ * 680×500 dialog (clamped to short/narrow viewports — the Miller row scrolls
  * sideways, the columns scroll down) whose header carries the title, the selection-path
  * breadcrumb, and a click-to-edit path zone; below it a Miller view — one
- * full-width level until a row is selected, then two 256px columns (level |
- * selected folder's children) around a hairline divider. Selecting in the
+ * full-width level until a row is selected, then two columns splitting the
+ * row evenly (256px floor; level | selected folder's children) around a
+ * hairline divider. Navigations land selection-anchored and quiet: the
+ * previous view keeps rendering while a crumb jump or a submitted path is
+ * scanned, then target and parent legs land as one two-pane frame (a slow
+ * parent leg falls back to landing the target alone and upgrading in
+ * place), so stepping back keeps two panes away from the display root and
+ * navigation never flashes an intermediate frame. Selecting in the
  * right column shifts the view one level deeper. "New folder" opens a nested
  * create dialog targeting the selected folder (or the level itself) and
  * selects the created folder. Open adopts the selected folder, falling back
  * to the listed level. Pure consumer of the injected browse calls — the
  * owning flow decides what "Open" means and owns the workspace-creation
- * error surface. Hidden entries are host-flagged and filtered here (a
- * show-hidden toggle is deferred work, client-side only).
+ * error surface. Hidden entries are host-flagged and hidden by default; the
+ * footer's fixed-label "Show hidden files" toggle (aria-pressed, check when
+ * on) reveals them (client-side only). The path editor opens seeded with a
+ * trailing separator, and while the draft's directory part names a listed
+ * level, its final segment prefix-filters that level's rows (a dot-led
+ * prefix also reveals the hidden entries it names).
  */
 import { useCallback, useEffect, useRef, useState } from 'react'
 import clsx from 'clsx'
 import {
-  Button, IconChevronRightOutline14, IconFolderClose16, IconFolderOpen16, IconPlusOutline16, Modal,
+  Button, IconCheckOutline16, IconChevronRightOutline14, IconFolderClose16, IconFolderOpen16, IconPlusOutline16, Modal,
 } from '@deepseek-ai/dsh-client-ui-primitives'
 import type { DirectoryEntry, DirectoryListing } from '@deepseek-ai/dsh-client-runtime/client'
 import { DirectoryBrowseError } from '@deepseek-ai/dsh-client-runtime/client'
@@ -47,6 +57,24 @@ function failureText(error: unknown): string {
   return error instanceof Error ? error.message : String(error)
 }
 
+/**
+ * How long a scan may stay visually silent before the floating "Loading…"
+ * pill appears. The stale view keeps rendering while a scan is in flight, so
+ * a listing that settles inside this window swaps the panes with no
+ * intermediate frame at all; only a genuinely slow host (a network mount, a
+ * cold disk) surfaces the indicator.
+ */
+const SLOW_SCAN_DELAY_MS = 300
+
+/**
+ * How long a navigation landing waits for its parent leg before committing
+ * the target alone. Inside the window both legs land as ONE two-pane frame —
+ * no single-pane flash between them; past it the target commits single-pane
+ * at once (an Enter-submitted navigation is never held hostage by a stalled
+ * parent) and the late parent leg upgrades the landing in place.
+ */
+const PARENT_LEG_WAIT_MS = 200
+
 /**
  * Breadcrumb rows for display: inside the home subtree the chain starts at a
  * localized Home crumb; outside it the full ancestry shows, the root labeled
@@ -59,17 +87,59 @@ function displayCrumbs(listing: DirectoryListing, homeLabel: string): DirectoryE
   return [{ name: homeLabel, path: listing.home, hidden: false }, ...tail]
 }
 
+/**
+ * The listing's platform separator, inferred from the home path the host
+ * stamped — never from typed text or entry paths, where a backslash is a
+ * legal POSIX name character. Still a heuristic at the last step: a POSIX
+ * home directory whose own name contains a backslash would misread.
+ * TODO: replace with a host-stamped `separator` field on the wire
+ * DirectoryListing so the platform fact travels verbatim (the trade-off is
+ * recorded in the directory-picker capability seam Agent Note).
+ */
+function separatorOf(listing: DirectoryListing): '\\' | '/' {
+  return listing.home.includes('\\') ? '\\' : '/'
+}
+
+/**
+ * The path draft's final segment, when its directory part is exactly the
+ * level `listing` lists — the segment the level prefix-filters on while the
+ * user types. Any other draft (no separator yet, or naming some other
+ * directory) leaves the level unfiltered. The directory part compares
+ * exactly (it is the host's own path text, reached by seeding or erasing);
+ * only the name filter downstream is case-insensitive.
+ */
+function draftPrefixFor(listing: DirectoryListing, draft: string | null): string | null {
+  if (draft === null) return null
+  const sep = separatorOf(listing)
+  const cut = draft.lastIndexOf(sep)
+  if (cut === -1) return null
+  const level = listing.path.endsWith(sep) ? listing.path : `${listing.path}${sep}`
+  return draft.slice(0, cut + 1) === level ? draft.slice(cut + 1) : null
+}
+
 /** One column of folder rows (the Miller view renders one or two of these). */
-function LevelColumn({ entries, selectedPath, busy, onPick, wide }: {
+function LevelColumn({ entries, selectedPath, busy, onPick, showHidden, filterPrefix, pathEditing }: {
   entries: readonly DirectoryEntry[]
   selectedPath: string | null
   busy: boolean
   onPick: (entry: DirectoryEntry) => void
-  wide: boolean
+  showHidden: boolean
+  filterPrefix: string | null
+  pathEditing: boolean
 }) {
+  const visible = entries.filter((entry) => {
+    // The selection is exempt from both filters: it anchors the two-pane
+    // view (crumbs and the child pane point at it), so neither the hidden
+    // filter after a dot-reveal pick nor a prefix miss may orphan it.
+    if (entry.path === selectedPath) return true
+    if (filterPrefix !== null && !entry.name.toLowerCase().startsWith(filterPrefix.toLowerCase())) return false
+    // A dot-led prefix names hidden entries explicitly, so matching ones
+    // surface even while the toggle keeps the rest hidden.
+    return showHidden || !entry.hidden || filterPrefix?.startsWith('.') === true
+  })
   return (
-    <div className={clsx(css.column, wide && css.columnWide)} role="list">
-      {entries.filter(entry => !entry.hidden).map((entry) => {
+    <div className={css.column} role="list">
+      {visible.map((entry) => {
         const selected = entry.path === selectedPath
         return (
           // The wrapper carries the list semantics; the row keeps its NATIVE
@@ -80,6 +150,15 @@ function LevelColumn({ entries, selectedPath, busy, onPick, wide }: {
               aria-current={selected || undefined}
               className={clsx(css.row, selected && css.rowSelected)}
               disabled={busy}
+              // While the path editor is open, keep focus in it: a focus
+              // steal on mousedown would blur the editor and (in engines
+              // where the blur lands before our guards) drop this click.
+              // Outside editing, rows keep native focus behavior.
+              onMouseDown={pathEditing ? (event) => { event.preventDefault() } : undefined}
+              // Editing-time focus parking happens after commit (the
+              // DirectoryBrowser refocus effect): a right-pane pick replaces
+              // this very column, so focusing the clicked node here would
+              // still fall to body.
               onClick={() => { onPick(entry) }}
             >
               {selected
@@ -107,9 +186,19 @@ export function DirectoryBrowser({ open, listDirectory, createDirectory, onOpen,
   const [selected, setSelected] = useState<DirectoryEntry | null>(null)
   const [child, setChild] = useState<DirectoryListing | null>(null)
   const [loading, setLoading] = useState(false)
+  // Derived from `loading` and `scanWindow` by the slow-scan effect below:
+  // true only once the current listing call has been in flight for
+  // SLOW_SCAN_DELAY_MS, so fast listings never render the indicator at all.
+  const [slowScan, setSlowScan] = useState(false)
+  // Every listing call owns a fresh silence window. `loading` may stay true
+  // across a superseding row pick or across a navigation's target and parent
+  // legs, so its boolean edge cannot identify the start of each scan.
+  const [scanWindow, setScanWindow] = useState(0)
   const [error, setError] = useState<string | null>(null)
   // Path-edit state: null = breadcrumb mode; a string = the draft being typed.
   const [pathDraft, setPathDraft] = useState<string | null>(null)
+  // Show-hidden toggle state (pure client-side filter, reset on each open).
+  const [showHidden, setShowHidden] = useState(false)
   // Create-folder state: null = closed; a string = the nested dialog's draft.
   const [folderDraft, setFolderDraft] = useState<string | null>(null)
   const [creatingFolder, setCreatingFolder] = useState(false)
@@ -148,36 +237,128 @@ export function DirectoryBrowser({ open, listDirectory, createDirectory, onOpen,
     return ++requestSeq.current
   }, [])
 
+  /** Hide any prior indicator and start a fresh silence window for one listing call. */
+  const restartSlowScanWindow = useCallback((): void => {
+    setSlowScan(false)
+    setScanWindow(value => value + 1)
+  }, [])
+
   /** Launch one listing under a fresh controller so a later supersession can abort it. */
   const launchListing = useCallback((path: string | undefined): { seq: number; scan: Promise<DirectoryListing> } => {
     const seq = supersede()
     const controller = new AbortController()
     scanController.current = controller
+    restartSlowScanWindow()
     return { seq, scan: listDirectory(path, controller.signal) }
-  }, [supersede, listDirectory])
+  }, [supersede, restartSlowScanWindow, listDirectory])
 
-  /** Replace the whole view with one freshly listed level (no selection). */
+  /**
+   * Launch a follow-up listing under the CURRENT supersession seq: a newer
+   * intent aborts it like the leg it continues, and it supersedes nothing.
+   */
+  const continueScan = useCallback((path: string): Promise<DirectoryListing> => {
+    const controller = new AbortController()
+    scanController.current = controller
+    restartSlowScanWindow()
+    return listDirectory(path, controller.signal)
+  }, [restartSlowScanWindow, listDirectory])
+
+  /**
+   * Replace the whole view with a freshly navigated level. Away from the
+   * display root — the same collapse the crumb header renders, so crumbs and
+   * pane shape never disagree — the landing is two-pane: the target's ACTUAL
+   * parent-level entry re-selected (left pane = parent, right pane = the
+   * target), so a crumb jump reads as stepping back one pane. Both legs land
+   * as one frame when the parent leg settles within
+   * {@link PARENT_LEG_WAIT_MS}; past that bound (or at the display root) the
+   * target commits alone — single wide level, the editor closes, loading
+   * ends — and a late parent leg still upgrades the landing in place. A
+   * failed parent leg, or a truncated parent window that lacks the target,
+   * leaves the single-pane landing — the upgrade must never orphan the
+   * selection it exists to anchor. Until whichever commit comes first, the
+   * previous view keeps rendering: navigation swaps the panes, it never
+   * blanks them.
+   */
   const navigate = useCallback((path?: string) => {
     const { seq, scan } = launchListing(path)
     setLoading(true)
     setError(null)
-    scan.then((next) => {
+    scan.then((target) => {
       if (seq !== requestSeq.current) return
-      setParent(next)
-      setSelected(null)
-      setChild(null)
-      setLoading(false)
-      setPathDraft(null)
+      // The single-pane landing; `landed` makes it first-commit-only, while
+      // the two-pane commit below may still upgrade an already-landed view.
+      let landed = false
+      const landSingle = (): void => {
+        if (landed || seq !== requestSeq.current) return
+        landed = true
+        setParent(target)
+        setSelected(null)
+        setChild(null)
+        setLoading(false)
+        setPathDraft(null)
+      }
+      // Arity is label-independent: only the collapsed chain's depth decides.
+      if (displayCrumbs(target, '').length < 2) { landSingle(); return }
+      const parentCrumb = target.crumbs.at(-2)
+      /* v8 ignore next -- narrowing: a two-deep display chain implies a parent crumb (root-to-target inclusive). */
+      if (parentCrumb === undefined) { landSingle(); return }
+      continueScan(parentCrumb.path).then((parentLevel) => {
+        if (seq !== requestSeq.current) return
+        // Windows resolves a typed path preserving its case; anchor on the
+        // parent level's actual entry so selection comparisons hold.
+        const sep = separatorOf(parentLevel)
+        const fold = (value: string): string => (sep === '\\' ? value.toLowerCase() : value)
+        const match = parentLevel.entries.find(entry => fold(entry.path) === fold(target.path))
+        if (match === undefined) { landSingle(); return }
+        landed = true
+        setParent(parentLevel)
+        setSelected(match)
+        setChild(target)
+        // Idempotent on a late upgrade of a timed-out landing: reopening the
+        // editor or starting a newer scan supersedes this seq, so reaching
+        // here means the draft is closed and the loading flag is this
+        // navigation's own.
+        setLoading(false)
+        setPathDraft(null)
+      }, () => {
+        // The parent-leg failure (its abort included) never surfaces: the
+        // target listed fine, and nobody asked to see the parent level.
+        landSingle()
+      })
+      window.setTimeout(landSingle, PARENT_LEG_WAIT_MS)
     }, (reason: unknown) => {
       if (seq !== requestSeq.current) return
       setLoading(false)
       setError(failureText(reason))
     })
-  }, [launchListing])
+  }, [launchListing, continueScan])
 
-  /** Select a row of the listed level and preview its children on the right. */
+  // Editor-close focus parking (consumed by the refocus effect below the
+  // miller-row ref): a pick parks on the selection's row, Enter and an
+  // input-focused Escape park on the crumb edit zone that replaces the
+  // input. Pointer-out cancels never set (or clear) these — yanking focus
+  // back from wherever the user clicked would be worse than the fall.
+  const refocusPick = useRef(false)
+  const refocusEditZone = useRef(false)
+  const pathInputRef = useRef<HTMLInputElement | null>(null)
+  const editZoneRef = useRef<HTMLButtonElement | null>(null)
+
+  /**
+   * Select a row of the listed level and preview its children on the right.
+   * Deliberately NOT one-frame like navigate(): a pick's first duty is the
+   * immediate selected state on the clicked row, and the pane split IS that
+   * feedback (aria-current pill, crumbs following the selection) — holding
+   * it back for the child listing would make clicks feel dropped. The quiet
+   * rule governs whole-view replacement, where nothing acknowledges the
+   * click but the swap itself.
+   */
   const select = useCallback((entry: DirectoryEntry) => {
     const { seq, scan } = launchListing(entry.path)
+    // A pick while the path editor is open adopts the (filtered) row and
+    // closes the editor — the draft served its purpose. Focus re-parks on
+    // the selection after commit (see the refocus effect below).
+    if (pathDraft !== null) refocusPick.current = true
+    setPathDraft(null)
     setSelected(entry)
     setChild(null)
     setLoading(true)
@@ -193,8 +374,31 @@ export function DirectoryBrowser({ open, listDirectory, createDirectory, onOpen,
       // An unreadable selection cannot be the committing target while the
       // breadcrumb still names the level: fall back to the single pane.
       setSelected(null)
+      // Clearing the selection can unmount the very row the pick parked
+      // focus on (a dot-revealed hidden row re-hides); the refocus effect
+      // re-parks on the edit zone only if focus actually fell to body.
+      refocusEditZone.current = true
     })
-  }, [launchListing])
+  }, [launchListing, pathDraft])
+
+  /** Abandon path editing (Escape or clicking away) and restore the crumb view. */
+  const cancelPathEdit = useCallback(() => {
+    // Cancel also withdraws a navigation the editor already launched: its
+    // late success must not jump to the cancelled path, so the pending
+    // request is superseded and the view leaves the loading state.
+    supersede()
+    setLoading(false)
+    setPathDraft(null)
+    setError(null)
+    // Editing may have superseded the selection's preview request; a
+    // selection with no preview would render a half-empty two-pane view, so
+    // cancel falls back to the single-pane level.
+    if (child === null) setSelected(null)
+    // With no level listed yet (the editor superseded the initial home
+    // listing), plain cancellation would leave a permanently blank picker:
+    // restart the home listing.
+    if (parent === null) navigate()
+  }, [supersede, child, parent, navigate])
 
   /** A right-column pick advances the view one level: child becomes the level. */
   const advance = useCallback((entry: DirectoryEntry) => {
@@ -213,14 +417,24 @@ export function DirectoryBrowser({ open, listDirectory, createDirectory, onOpen,
       setSelected(null)
       setChild(null)
       setCreatingFolder(false)
+      setShowHidden(false)
       navigate()
       return
     }
     supersede()
+    // Closing mid-scan leaves nothing to load: without this edge the
+    // slow-scan effect keeps arming while hidden and the reopened dialog
+    // would show the indicator on its first frame instead of waiting out a
+    // fresh silence window (reopen's navigate() produces no loading edge).
+    setLoading(false)
     setError(null)
     setPathDraft(null)
     setFolderDraft(null)
     setCreateError(null)
+    // A close mid-flight (failed Enter, then Cancel) may leave refocus
+    // flags armed; retire them so a later render cannot consume them.
+    refocusPick.current = false
+    refocusEditZone.current = false
   }, [open, navigate, supersede])
 
   /** The folder a create or Open acts on: the selection, else the listed level. */
@@ -249,6 +463,10 @@ export function DirectoryBrowser({ open, listDirectory, createDirectory, onOpen,
       // create target becomes the listed level and the new folder its selection.
       const { seq, scan } = launchListing(targetPath)
       setLoading(true)
+      // Symmetric with navigate/select: a launched scan clears the stale
+      // failure text (and keeps the floating indicator's corner the only
+      // occupant of the content's right edge while it shows).
+      setError(null)
       scan.then((level) => {
         /* v8 ignore next -- same fence as navigate/select; the modal blocks superseding input */
         if (seq !== requestSeq.current) return
@@ -268,6 +486,19 @@ export function DirectoryBrowser({ open, listDirectory, createDirectory, onOpen,
     })
   }
 
+  // The slow-scan gate for the loading indicator: each listing call restarts
+  // the timer even when a superseding scan or a navigation's parent leg keeps
+  // `loading` continuously true. A settle inside its own window means the swap
+  // happened with nothing shown.
+  useEffect(() => {
+    if (!loading) {
+      setSlowScan(false)
+      return
+    }
+    const timer = window.setTimeout(() => { setSlowScan(true) }, SLOW_SCAN_DELAY_MS)
+    return () => { window.clearTimeout(timer) }
+  }, [loading, scanWindow])
+
   // After the hooks: a closed dialog renders nothing and evaluates no copy.
   const crumbSource = child ?? parent
   const crumbs = crumbSource === null ? [] : displayCrumbs(crumbSource, t('browser.home'))
@@ -285,6 +516,37 @@ export function DirectoryBrowser({ open, listDirectory, createDirectory, onOpen,
     const row = millerRowRef.current
     if (row !== null && childPath !== undefined) row.scrollLeft = row.scrollWidth
   }, [childPath])
+  // Every editor exit that would drop focus to body re-parks it after
+  // commit, so keyboard traversal stays inside the dialog (the Modal has no
+  // focus trap): a pick lands on the selection's row — aria-current in the
+  // freshly rendered left pane, which survives even a right-pane advance
+  // replacing the picked button's column — while Enter and an input-focused
+  // Escape land on the crumb edit zone that replaces the input.
+  useEffect(() => {
+    if (pathDraft !== null) return
+    if (refocusPick.current) {
+      refocusPick.current = false
+      refocusEditZone.current = false
+      const rowHost = millerRowRef.current
+      /* v8 ignore next -- narrowing guard: the miller row is mounted whenever a pick just committed. */
+      if (rowHost === null) return
+      const row = rowHost.querySelector<HTMLButtonElement>('button[aria-current="true"]')
+      /* v8 ignore next -- narrowing guard: the pick that set the flag just rendered its aria-current row. */
+      if (row === null) return
+      row.focus()
+      return
+    }
+    if (refocusEditZone.current) {
+      refocusEditZone.current = false
+      // Re-park only when the close actually dropped focus to body; focus
+      // the user parked elsewhere (a surviving row) stays theirs.
+      if (document.activeElement !== document.body) return
+      const zone = editZoneRef.current
+      /* v8 ignore next -- narrowing guard: crumb mode renders the edit zone whenever the editor just closed. */
+      if (zone === null) return
+      zone.focus()
+    }
+  })
 
   if (!open) return null
   const twoPane = selected !== null
@@ -310,149 +572,220 @@ export function DirectoryBrowser({ open, listDirectory, createDirectory, onOpen,
       className={clsx(css.dialog)}
       headless
     >
-      <div className={css.header}>
-        <h2 className={css.title}>{t('browser.title')}</h2>
-        <div className={css.crumbBar}>
-          {pathDraft === null
-            ? (
-              <>
-                <span className={css.crumbTrail} role="navigation" ref={crumbTrailRef}>
-                  {crumbs.map((crumb, index) => (
-                    <span key={crumb.path} className={css.crumbSeat}>
-                      {index > 0 && <IconChevronRightOutline14 size={12} className={css.crumbChevron} />}
-                      <button
-                        type="button"
-                        className={css.crumb}
-                        disabled={parentInert}
-                        onClick={() => { navigate(crumb.path) }}
-                      >
-                        {crumb.name}
-                      </button>
-                    </span>
-                  ))}
-                </span>
-                {/* The empty zone right of the crumbs is the path-edit affordance. */}
-                <button
-                  type="button"
-                  className={css.crumbEditZone}
-                  aria-label={t('browser.editPath')}
-                  // Stays available with no listed level: when the home
-                  // listing itself fails, typing an absolute path is the one
-                  // remaining way forward.
-                  disabled={parentInert}
-                  onClick={() => {
+      {/* Path-edit cancellation is observed at the card scope, not the
+        * input: once Tab parks focus on a filtered row the input is off the
+        * event path, yet Escape must still collapse the editor (not the
+        * dialog) and a further focus move out of the card must still
+        * cancel. display:contents keeps header/content/footer as direct
+        * flex children of the Modal card. */}
+      <div
+        className={css.editorScope}
+        onKeyDown={(event) => {
+          if (event.key !== 'Escape' || pathDraft === null) return
+          // stopPropagation keeps the card-scope Escape from the Modal's
+          // document listener — the same containment the input previously
+          // provided for itself.
+          event.stopPropagation()
+          // Escape while the input holds focus is about to unmount it; with
+          // focus already parked on a row, that row survives the cancel and
+          // keeps focus naturally. Assignment (not a conditional set) also
+          // retires a stale flag a failed or still-upgrading Enter left.
+          refocusEditZone.current = document.activeElement === pathInputRef.current
+          cancelPathEdit()
+        }}
+        // Focus leaving THIS dialog card while editing cancels like Escape.
+        // Guarded non-cancel paths: window/tab focus loss (document no
+        // longer focused); a focus move that stays inside the card (Tab
+        // onto the filtered rows or the footer toggle); and pointer paths,
+        // where rows and the toggle suppress focus steal on mousedown while
+        // editing so their click lands first. Enter keeps focus in the
+        // input while its navigation is in flight, so a submitted path is
+        // never withdrawn here. Anchored to this card via closest, not any
+        // [role="dialog"], so focus escaping into a sibling overlay cancels.
+        onBlur={(event) => {
+          if (pathDraft === null) return
+          if (!document.hasFocus()) return
+          const card = event.currentTarget.closest('[role="dialog"]')
+          /* v8 ignore next -- narrowing guard: this scope always renders inside the Modal card. */
+          if (card === null) return
+          if (event.relatedTarget instanceof Node && card.contains(event.relatedTarget)) return
+          // The user moved focus out of the card themselves: cancel without
+          // re-parking (a lingering Enter-failure flag must not yank focus
+          // back either).
+          refocusEditZone.current = false
+          cancelPathEdit()
+        }}
+      >
+        <div className={css.header}>
+          <h2 className={css.title}>{t('browser.title')}</h2>
+          <div className={css.crumbBar}>
+            {pathDraft === null
+              ? (
+                <>
+                  <span className={css.crumbTrail} role="navigation" ref={crumbTrailRef}>
+                    {crumbs.map((crumb, index) => (
+                      <span key={crumb.path} className={css.crumbSeat}>
+                        {index > 0 && <IconChevronRightOutline14 size={12} className={css.crumbChevron} />}
+                        <button
+                          type="button"
+                          className={css.crumb}
+                          disabled={parentInert}
+                          onClick={() => { navigate(crumb.path) }}
+                        >
+                          {crumb.name}
+                        </button>
+                      </span>
+                    ))}
+                  </span>
+                  {/* The empty zone right of the crumbs is the path-edit affordance. */}
+                  <button
+                    type="button"
+                    className={css.crumbEditZone}
+                    aria-label={t('browser.editPath')}
+                    // Stays available with no listed level: when the home
+                    // listing itself fails, typing an absolute path is the one
+                    // remaining way forward.
+                    disabled={parentInert}
+                    ref={editZoneRef}
+                    onClick={() => {
                     // Opening the editor supersedes any pending listing: a
                     // settlement landing before the first keystroke would
                     // otherwise close the editor via navigate's draft reset.
-                    supersede()
-                    setLoading(false)
-                    setPathDraft(selected?.path ?? parent?.path ?? '')
-                  }}
-                />
-              </>
-            )
-            : (
-              <input
-                className={css.pathInput}
-                value={pathDraft}
-                aria-label={t('browser.editPath')}
-                autoFocus
-                disabled={parentInert}
-                onChange={(event) => {
+                      supersede()
+                      setLoading(false)
+                      // Seed with a trailing separator so typing immediately
+                      // continues into child names (and prefix-filters below).
+                      // No listed level means nothing to seed from (the editor
+                      // is the recovery path for a failed home listing).
+                      if (parent === null) {
+                        setPathDraft('')
+                        return
+                      }
+                      const base = selected?.path ?? parent.path
+                      const sep = separatorOf(parent)
+                      setPathDraft(base.endsWith(sep) ? base : `${base}${sep}`)
+                    }}
+                  />
+                </>
+              )
+              : (
+                <input
+                  className={css.pathInput}
+                  value={pathDraft}
+                  aria-label={t('browser.editPath')}
+                  autoFocus
+                  ref={pathInputRef}
+                  disabled={parentInert}
+                  onChange={(event) => {
                   // Editing the draft supersedes any in-flight navigation:
                   // its completion must neither clear the newer text nor
                   // repopulate the view with the older path.
-                  supersede()
-                  setLoading(false)
-                  setPathDraft(event.target.value)
-                }}
-                {...compositionGuard}
-                onKeyDown={(event) => {
-                  if (event.key === 'Enter' && !composingRef.current) {
-                    event.preventDefault()
-                    // Trim only detects a blank draft; the Host gets the
-                    // original text — a real directory name may end in
-                    // whitespace, and trimming would list its sibling.
-                    if (pathDraft.trim() !== '') navigate(pathDraft)
-                  }
-                  if (event.key === 'Escape') {
-                    event.stopPropagation()
-                    // Cancel also withdraws a navigation the editor already
-                    // launched: its late success must not jump to the
-                    // cancelled path, so the pending request is superseded
-                    // and the view leaves the loading state.
                     supersede()
                     setLoading(false)
-                    setPathDraft(null)
-                    setError(null)
-                    // Editing may have superseded the selection's preview
-                    // request; a selection with no preview would render a
-                    // half-empty two-pane view, so cancel falls back to the
-                    // single-pane level.
-                    if (child === null) setSelected(null)
-                    // With no level listed yet (the editor superseded the
-                    // initial home listing), plain cancellation would leave a
-                    // permanently blank picker: restart the home listing.
-                    if (parent === null) navigate()
-                  }
-                }}
+                    setPathDraft(event.target.value)
+                  }}
+                  {...compositionGuard}
+                  // Escape and focus-leave cancellation live on the card-scope
+                  // wrapper above (they must work after focus Tabs onto the
+                  // rows); this handler owns only submission.
+                  onKeyDown={(event) => {
+                    if (event.key === 'Enter' && !composingRef.current) {
+                      event.preventDefault()
+                      // Trim only detects a blank draft; the Host gets the
+                      // original text — a real directory name may end in
+                      // whitespace, and trimming would list its sibling.
+                      if (pathDraft.trim() !== '') {
+                        // Success will unmount the still-focused input; park
+                        // focus on the returning crumb edit zone (a failure
+                        // keeps the editor, so the flag waits until close).
+                        refocusEditZone.current = true
+                        navigate(pathDraft)
+                      }
+                    }
+                  }}
+                />
+              )}
+          </div>
+        </div>
+        <div className={css.content}>
+          <div className={css.millerRow} ref={millerRowRef}>
+            {parent !== null && (
+              <LevelColumn
+                entries={parent.entries}
+                selectedPath={selected?.path ?? null}
+                busy={parentInert}
+                onPick={select}
+                showHidden={showHidden}
+                filterPrefix={draftPrefixFor(parent, pathDraft)}
+                pathEditing={draftPending}
               />
             )}
-        </div>
-      </div>
-      <div className={css.content}>
-        <div className={css.millerRow} ref={millerRowRef}>
-          {parent !== null && (
-            <LevelColumn
-              entries={parent.entries}
-              selectedPath={selected?.path ?? null}
-              busy={parentInert}
-              onPick={select}
-              wide={!twoPane}
-            />
-          )}
-          {twoPane && <span className={css.divider} />}
-          {twoPane && child !== null && (
-            <LevelColumn
-              entries={child.entries}
-              selectedPath={null}
-              busy={parentInert}
-              onPick={advance}
-              wide={false}
-            />
-          )}
-        </div>
-        {loading && <div className={css.status} role="status">{t('browser.loading')}</div>}
-        {/* The backend bounds a level at its complete-result limit; say so
+            {twoPane && <span className={css.divider} />}
+            {twoPane && child !== null && (
+              <LevelColumn
+                entries={child.entries}
+                selectedPath={null}
+                busy={parentInert}
+                onPick={advance}
+                showHidden={showHidden}
+                filterPrefix={draftPrefixFor(child, pathDraft)}
+                pathEditing={draftPending}
+              />
+            )}
+          </div>
+          {loading && slowScan
+          && <div className={clsx(css.status, css.loadingFloat)} role="status">{t('browser.loading')}</div>}
+          {/* The backend bounds a level at its complete-result limit; say so
           * whenever a visible pane was cut instead of letting the tail of a
-          * huge directory go silently missing. */}
-        {(parent?.truncated === true || child?.truncated === true) && !loading
+          * huge directory go silently missing. The note describes the panes
+          * on screen, so an in-flight scan leaves it alone — hiding it while
+          * the stale view still shows the cut level would shift the columns
+          * on every navigation away from it. */}
+          {(parent?.truncated === true || child?.truncated === true)
           && <div className={css.status} role="status">{t('browser.truncated')}</div>}
-        {error !== null && <div className={css.error} role="alert">{error}</div>}
-      </div>
-      <div className={css.footerBar}>
-        <Button
-          variant="outline"
-          icon={<IconPlusOutline16 size={14} />}
-          disabled={parent === null || loading || parentInert || draftPending}
-          onClick={() => {
-            setFolderDraft('')
-            setCreateError(null)
-          }}
-        >
-          {t('browser.newFolder')}
-        </Button>
-        <span className={css.footerGap} />
-        <Button variant="outline" className={clsx(css.footerAction)} disabled={parentInert} onClick={onClose}>{t('browser.cancel')}</Button>
-        <Button
-          variant="primary"
-          className={clsx(css.footerAction)}
-          disabled={targetPath === null || loading || parentInert || draftPending}
-          /* v8 ignore next -- narrowing guard: Open disables while no target exists. */
-          onClick={() => { if (targetPath !== null) onOpen(targetPath) }}
-        >
-          {t('browser.open')}
-        </Button>
+          {error !== null && <div className={css.error} role="alert">{error}</div>}
+        </div>
+        <div className={css.footerBar}>
+          <Button
+            variant="outline"
+            icon={<IconPlusOutline16 size={14} />}
+            disabled={parent === null || loading || parentInert || draftPending}
+            onClick={() => {
+              setFolderDraft('')
+              setCreateError(null)
+            }}
+          >
+            {t('browser.newFolder')}
+          </Button>
+          <button
+            type="button"
+            className={clsx(css.showHiddenToggle, showHidden && css.showHiddenToggleActive)}
+            aria-pressed={showHidden}
+            disabled={parentInert}
+            // The toggle composes with the path editor (dot-led prefixes and
+            // this filter interleave): while editing, don't steal focus, so
+            // toggling never blur-cancels a draft mid-thought. Outside editing
+            // it keeps native focus behavior.
+            onMouseDown={draftPending ? (event) => { event.preventDefault() } : undefined}
+            onClick={() => { setShowHidden(prev => !prev) }}
+          >
+            {t('browser.showHidden')}
+            {/* Trailing check (Menu's selected vocabulary): the label never
+              * shifts when the pressed state toggles. */}
+            {showHidden && <IconCheckOutline16 size={14} />}
+          </button>
+          <span className={css.footerGap} />
+          <Button variant="outline" className={clsx(css.footerAction)} disabled={parentInert} onClick={onClose}>{t('browser.cancel')}</Button>
+          <Button
+            variant="primary"
+            className={clsx(css.footerAction)}
+            disabled={targetPath === null || loading || parentInert || draftPending}
+            /* v8 ignore next -- narrowing guard: Open disables while no target exists. */
+            onClick={() => { if (targetPath !== null) onOpen(targetPath) }}
+          >
+            {t('browser.open')}
+          </Button>
+        </div>
       </div>
       {/* Nested create dialog (figma 813:23278): names one folder inside the target. */}
       <Modal

packages/host/directory-picker-browse/src/client/index.ts

@@ -46,6 +46,7 @@ export function apply(ctx: ClientContext): void {
         'browser.editPath': '编辑路径',
         'browser.loading': '加载中…',
         'browser.truncated': '文件夹过多，仅显示开头部分。',
+        'browser.showHidden': '显示隐藏文件',
       }],
       ['en', {
         'browser.title': 'Select Workspace Directory',
@@ -60,6 +61,7 @@ export function apply(ctx: ClientContext): void {
         'browser.editPath': 'Edit path',
         'browser.loading': 'Loading…',
         'browser.truncated': 'Too many folders to list; only the beginning is shown.',
+        'browser.showHidden': 'Show hidden files',
       }],
     ]
     try {

packages/host/directory-picker-browse/tests/client-flow.spec.tsx

@@ -162,6 +162,7 @@ describe('directory-picker-browse client half', () => {
     // zh is the shipped default locale.
     expect(injected.t('browser.title')).toBe('选择工作区目录')
     expect(injected.t('browser.newFolder')).toBe('新建文件夹')
+    expect(injected.t('browser.showHidden')).toBe('显示隐藏文件')
   })
 
   it('drives the injected browse calls through the hole entry', async () => {

packages/host/directory-picker-browse/tests/directory-browser.spec.tsx

@@ -29,6 +29,25 @@ function listingFor(path?: string): DirectoryListing {
       ],
       truncated: false,
     },
+    '/': {
+      path: '/',
+      home: HOME,
+      crumbs: [{ name: '/', path: '/', hidden: false }],
+      entries: [{ name: 'home', path: '/home', hidden: false }],
+      truncated: false,
+    },
+    [`${HOME}/.config`]: {
+      path: `${HOME}/.config`,
+      home: HOME,
+      crumbs: [
+        { name: '/', path: '/', hidden: false },
+        { name: 'home', path: '/home', hidden: false },
+        { name: 'u', path: HOME, hidden: false },
+        { name: '.config', path: `${HOME}/.config`, hidden: true },
+      ],
+      entries: [],
+      truncated: false,
+    },
     [DOCS]: {
       path: DOCS,
       home: HOME,
@@ -92,6 +111,12 @@ function rowButton(item: HTMLElement): HTMLButtonElement {
 }
 
 describe('DirectoryBrowser', () => {
+  it('renders nothing and launches no listing while initially closed', () => {
+    const b = mount({ open: false })
+    expect(screen.queryByRole('dialog')).toBeNull()
+    expect(b.listDirectory).not.toHaveBeenCalled()
+  })
+
   it('opens at the Host home as one wide column, hides hidden entries, and roots the crumbs at Home', async () => {
     const b = mount()
     await waitFor(() => { expect(screen.getByRole('listitem')).toBeTruthy() })
@@ -103,6 +128,28 @@ describe('DirectoryBrowser', () => {
     expect(screen.queryByRole('button', { name: '/' })).toBeNull()
   })
 
+  it('shows hidden entries when the toggle is on and hides them again on close', async () => {
+    const b = mount()
+    await waitFor(() => { expect(screen.getByRole('listitem')).toBeTruthy() })
+    expect(screen.queryByText('.config')).toBeNull()
+    // The fixed-label toggle reports its state through aria-pressed. Its
+    // mousedown never steals focus (so it composes with the path editor).
+    const toggle = screen.getByRole('button', { name: 'browser.showHidden' })
+    expect(toggle.getAttribute('aria-pressed')).toBe('false')
+    fireEvent.mouseDown(toggle)
+    fireEvent.click(toggle)
+    expect(toggle.getAttribute('aria-pressed')).toBe('true')
+    expect(screen.getByText('.config')).toBeTruthy()
+    fireEvent.click(toggle)
+    expect(toggle.getAttribute('aria-pressed')).toBe('false')
+    expect(screen.queryByText('.config')).toBeNull()
+    // Close resets the toggle.
+    b.view.rerender(<DirectoryBrowser {...b.props} open={false} />)
+    b.view.rerender(<DirectoryBrowser {...b.props} open />)
+    await waitFor(() => { expect(screen.getByRole('listitem')).toBeTruthy() })
+    expect(screen.queryByText('.config')).toBeNull()
+  })
+
   it('selects a row into the two-pane view: children preview right, crumbs follow the selection', async () => {
     const b = mount()
     await waitFor(() => { expect(screen.getByRole('listitem')).toBeTruthy() })
@@ -153,7 +200,7 @@ describe('DirectoryBrowser', () => {
     expect(signals[2]?.aborted).toBe(true)
   })
 
-  it('jumps back through a crumb into a fresh single-column level', async () => {
+  it('a crumb jump to the display root (home) lands the single wide level', async () => {
     mount()
     await waitFor(() => { expect(screen.getByRole('listitem')).toBeTruthy() })
     fireEvent.click(rowButton(screen.getByRole('listitem')))
@@ -164,6 +211,393 @@ describe('DirectoryBrowser', () => {
     expect(rowButton(screen.getByRole('listitem')).getAttribute('aria-current')).toBeNull()
   })
 
+  it('a crumb jump away from the root lands two-pane with the target selected', async () => {
+    mount()
+    await waitFor(() => { expect(screen.getByRole('listitem')).toBeTruthy() })
+    fireEvent.click(rowButton(screen.getByRole('listitem')))
+    await waitFor(() => { expect(columns()).toHaveLength(2) })
+    fireEvent.click(rowButton(within(columns()[1]!).getByRole('listitem')))
+    await waitFor(() => { expect(screen.getByRole('button', { name: 'harness' })).toBeTruthy() })
+    // Jumping to the Documents crumb is a step BACK one pane, not a
+    // collapse: Documents stays selected in the home level, its children
+    // stay on the right.
+    fireEvent.click(screen.getByRole('button', { name: 'Documents' }))
+    await waitFor(() => {
+      expect(rowButton(within(columns()[0]!).getByRole('listitem')).getAttribute('aria-current')).toBe('true')
+    })
+    expect(columns()).toHaveLength(2)
+    expect(within(columns()[0]!).getByText('Documents')).toBeTruthy()
+    expect(within(columns()[1]!).getByText('harness')).toBeTruthy()
+  })
+
+  it('a navigation to the filesystem root keeps the single wide level', async () => {
+    mount()
+    await waitFor(() => { expect(screen.getByRole('listitem')).toBeTruthy() })
+    fireEvent.click(screen.getByRole('button', { name: 'browser.editPath' }))
+    fireEvent.change(screen.getByLabelText<HTMLInputElement>('browser.editPath'), { target: { value: '/' } })
+    fireEvent.keyDown(screen.getByLabelText('browser.editPath'), { key: 'Enter' })
+    // A one-crumb chain has no parent level to show on the left.
+    await waitFor(() => { expect(screen.getByRole('listitem').textContent).toBe('home') })
+    expect(columns()).toHaveLength(1)
+  })
+
+  it('lands the target single-pane at the wait bound, aborts a superseded parent leg on the wire, and drops its late resolution', async () => {
+    vi.useFakeTimers()
+    try {
+      const signals: (AbortSignal | undefined)[] = []
+      const settlers: ((value: DirectoryListing) => void)[] = []
+      // Only the FIRST explicit HOME request (the parent leg) hangs; the
+      // later home crumb jump lists normally.
+      let homeCalls = 0
+      const listDirectory = vi.fn((path?: string, signal?: AbortSignal) => {
+        signals.push(signal)
+        if (path === HOME && ++homeCalls === 1) {
+          return new Promise<DirectoryListing>((resolve) => { settlers.push(resolve) })
+        }
+        return Promise.resolve(listingFor(path))
+      })
+      mount({ listDirectory })
+      await act(async () => {})
+      fireEvent.click(screen.getByRole('button', { name: 'browser.editPath' }))
+      fireEvent.change(screen.getByLabelText<HTMLInputElement>('browser.editPath'), { target: { value: DOCS } })
+      fireEvent.keyDown(screen.getByLabelText('browser.editPath'), { key: 'Enter' })
+      // The target settled but the parent leg hangs: inside the wait bound
+      // nothing commits yet.
+      await act(async () => {})
+      expect(settlers).toHaveLength(1)
+      expect(screen.getByLabelText('browser.editPath', { selector: 'input' })).toBeTruthy()
+      // The wait bound expires: the target commits alone — editor closed,
+      // single-pane DOCS level.
+      await act(async () => { vi.advanceTimersByTime(200) })
+      expect(screen.getByRole('listitem').textContent).toBe('harness')
+      expect(screen.queryByLabelText('browser.editPath', { selector: 'input' })).toBeNull()
+      expect(columns()).toHaveLength(1)
+      // A newer jump aborts the pending parent leg ON THE WIRE, not merely
+      // dropping its settlement.
+      fireEvent.click(screen.getByRole('button', { name: 'browser.home' }))
+      expect(signals[2]?.aborted).toBe(true)
+      await act(async () => {})
+      expect(screen.getByRole('listitem').textContent).toBe('Documents')
+      // Its late resolution changes nothing either.
+      await act(async () => { settlers[0]!(listingFor(HOME)) })
+      expect(columns()).toHaveLength(1)
+      expect(rowButton(screen.getByRole('listitem')).getAttribute('aria-current')).toBeNull()
+    } finally {
+      vi.useRealTimers()
+    }
+  })
+
+  /**
+   * Listing fake whose explicit-path scans stay pending until the test
+   * settles them by path; the absent-path form (the initial home listing)
+   * resolves normally so mounting is a one-flush setup.
+   */
+  function manualLister() {
+    const settlers = new Map<string, (value: DirectoryListing) => void>()
+    const listDirectory = vi.fn((path?: string, _signal?: AbortSignal) => {
+      if (path === undefined) return Promise.resolve(listingFor(path))
+      return new Promise<DirectoryListing>((resolve) => { settlers.set(path, resolve) })
+    })
+    return { settlers, listDirectory }
+  }
+
+  it('lands a navigation as ONE two-pane frame: the stale view holds until both legs arrive', async () => {
+    vi.useFakeTimers()
+    try {
+      const { settlers, listDirectory } = manualLister()
+      mount({ listDirectory })
+      await act(async () => {})
+      fireEvent.click(screen.getByRole('button', { name: 'browser.editPath' }))
+      fireEvent.change(screen.getByLabelText<HTMLInputElement>('browser.editPath'), { target: { value: DOCS } })
+      fireEvent.keyDown(screen.getByLabelText('browser.editPath'), { key: 'Enter' })
+      // The target settles while the parent leg is still in flight: nothing
+      // commits yet — the editor stays open over the stale home level, and no
+      // single-pane DOCS frame ever renders.
+      await act(async () => { settlers.get(DOCS)!(listingFor(DOCS)) })
+      expect(screen.getByLabelText('browser.editPath', { selector: 'input' })).toBeTruthy()
+      expect(screen.queryByText('harness')).toBeNull()
+      // The parent leg settles inside the wait bound: one commit straight to
+      // the two-pane landing, editor closed.
+      await act(async () => { settlers.get(HOME)!(listingFor(HOME)) })
+      expect(columns()).toHaveLength(2)
+      expect(rowButton(within(columns()[0]!).getByRole('listitem')).getAttribute('aria-current')).toBe('true')
+      expect(within(columns()[0]!).getByText('Documents')).toBeTruthy()
+      expect(within(columns()[1]!).getByText('harness')).toBeTruthy()
+      expect(screen.queryByLabelText('browser.editPath', { selector: 'input' })).toBeNull()
+      // The wait-bound timer firing after the landing is a no-op.
+      await act(async () => { vi.advanceTimersByTime(200) })
+      expect(columns()).toHaveLength(2)
+    } finally {
+      vi.useRealTimers()
+    }
+  })
+
+  it('a stalled parent leg lands the target alone at the wait bound, then upgrades in place', async () => {
+    vi.useFakeTimers()
+    try {
+      const { settlers, listDirectory } = manualLister()
+      mount({ listDirectory })
+      await act(async () => {})
+      fireEvent.click(screen.getByRole('button', { name: 'browser.editPath' }))
+      fireEvent.change(screen.getByLabelText<HTMLInputElement>('browser.editPath'), { target: { value: DOCS } })
+      fireEvent.keyDown(screen.getByLabelText('browser.editPath'), { key: 'Enter' })
+      // The target can consume most of the outer scan's silence window.
+      await act(async () => { vi.advanceTimersByTime(250) })
+      await act(async () => { settlers.get(DOCS)!(listingFor(DOCS)) })
+      // Its parent leg gets a fresh silence window. Crossing the original
+      // scan's 300ms deadline therefore cannot flash the indicator during the
+      // bounded landing wait.
+      await act(async () => { vi.advanceTimersByTime(199) })
+      expect(screen.queryByText('browser.loading')).toBeNull()
+      // The parent leg outlives PARENT_LEG_WAIT_MS: the target lands alone.
+      await act(async () => { vi.advanceTimersByTime(1) })
+      expect(columns()).toHaveLength(1)
+      expect(screen.getByRole('listitem').textContent).toBe('harness')
+      expect(screen.queryByLabelText('browser.editPath', { selector: 'input' })).toBeNull()
+      // The late parent leg still upgrades the landing in place, exactly as
+      // if it had made the bound. (Reopening the editor meanwhile would
+      // supersede the upgrade — the editor-open handler withdraws pending
+      // listings — so a late upgrade can never close a resumed draft.)
+      await act(async () => { settlers.get(HOME)!(listingFor(HOME)) })
+      expect(columns()).toHaveLength(2)
+      expect(rowButton(within(columns()[0]!).getByRole('listitem')).getAttribute('aria-current')).toBe('true')
+      expect(within(columns()[1]!).getByText('harness')).toBeTruthy()
+    } finally {
+      vi.useRealTimers()
+    }
+  })
+
+  it('Escape inside the landing window withdraws the submitted navigation', async () => {
+    vi.useFakeTimers()
+    try {
+      const { settlers, listDirectory } = manualLister()
+      mount({ listDirectory })
+      await act(async () => {})
+      fireEvent.click(screen.getByRole('button', { name: 'browser.editPath' }))
+      const input = screen.getByLabelText<HTMLInputElement>('browser.editPath')
+      fireEvent.change(input, { target: { value: DOCS } })
+      fireEvent.keyDown(input, { key: 'Enter' })
+      await act(async () => { settlers.get(DOCS)!(listingFor(DOCS)) })
+      // Nothing has committed yet; Escape supersedes the landing entirely.
+      fireEvent.keyDown(input, { key: 'Escape' })
+      await act(async () => { vi.advanceTimersByTime(200) })
+      expect(columns()).toHaveLength(1)
+      expect(screen.queryByText('harness')).toBeNull()
+      expect(within(columns()[0]!).getByText('Documents')).toBeTruthy()
+      expect(screen.queryByLabelText('browser.editPath', { selector: 'input' })).toBeNull()
+    } finally {
+      vi.useRealTimers()
+    }
+  })
+
+  it('shows the loading indicator only once a scan outlives its silence window, floating over the stale view', async () => {
+    vi.useFakeTimers()
+    try {
+      // The home level is truncated so its note is on screen when the slow
+      // scan starts: dropping the note's old !loading guard means it must
+      // keep rendering through the scan, coexisting with the indicator.
+      const settlers = new Map<string, (value: DirectoryListing) => void>()
+      const listDirectory = vi.fn((path?: string, _signal?: AbortSignal) => {
+        if (path === undefined) return Promise.resolve({ ...listingFor(path), truncated: true })
+        return new Promise<DirectoryListing>((resolve) => { settlers.set(path, resolve) })
+      })
+      mount({ listDirectory })
+      await act(async () => {})
+      expect(screen.queryByText('browser.loading')).toBeNull()
+      expect(screen.getByText('browser.truncated')).toBeTruthy()
+      fireEvent.click(screen.getByRole('button', { name: 'browser.editPath' }))
+      fireEvent.change(screen.getByLabelText<HTMLInputElement>('browser.editPath'), { target: { value: DOCS } })
+      fireEvent.keyDown(screen.getByLabelText('browser.editPath'), { key: 'Enter' })
+      // In flight but still inside the silence window: no indicator, and the
+      // stale level's truncated note stays put (no layout churn on launch).
+      expect(screen.queryByText('browser.loading')).toBeNull()
+      expect(screen.getByText('browser.truncated')).toBeTruthy()
+      await act(async () => { vi.advanceTimersByTime(300) })
+      // Past it: the indicator floats while the stale level — truncated note
+      // included — keeps rendering beneath it.
+      expect(screen.getByText('browser.loading')).toBeTruthy()
+      expect(screen.getByText('browser.truncated')).toBeTruthy()
+      expect(screen.getByText('Documents')).toBeTruthy()
+      // Landing (both legs) retires the indicator with the scan, and the
+      // fresh listings' own truncated state replaces the stale note.
+      await act(async () => { settlers.get(DOCS)!(listingFor(DOCS)) })
+      await act(async () => { settlers.get(HOME)!(listingFor(HOME)) })
+      expect(screen.queryByText('browser.loading')).toBeNull()
+      expect(screen.queryByText('browser.truncated')).toBeNull()
+      expect(columns()).toHaveLength(2)
+    } finally {
+      vi.useRealTimers()
+    }
+  })
+
+  it('restarts the silence window when a row pick supersedes a pending scan', async () => {
+    vi.useFakeTimers()
+    try {
+      const pending: ((value: DirectoryListing) => void)[] = []
+      const listDirectory = vi.fn((path?: string, _signal?: AbortSignal) => {
+        if (path === undefined) return Promise.resolve(listingFor(path))
+        return new Promise<DirectoryListing>((resolve) => { pending.push(resolve) })
+      })
+      mount({ listDirectory })
+      await act(async () => {})
+      const documents = rowButton(screen.getByRole('listitem'))
+      fireEvent.click(documents)
+      await act(async () => { vi.advanceTimersByTime(300) })
+      expect(screen.getByText('browser.loading')).toBeTruthy()
+      // The same row remains actionable while its preview is pending. A second
+      // pick starts a new listing without a false `loading` edge.
+      fireEvent.click(documents)
+      expect(screen.queryByText('browser.loading')).toBeNull()
+      await act(async () => { vi.advanceTimersByTime(299) })
+      expect(screen.queryByText('browser.loading')).toBeNull()
+      await act(async () => { vi.advanceTimersByTime(1) })
+      expect(screen.getByText('browser.loading')).toBeTruthy()
+      await act(async () => { pending.at(-1)!(listingFor(DOCS)) })
+    } finally {
+      vi.useRealTimers()
+    }
+  })
+
+  it('a close mid-scan resets the slow-scan gate: reopening waits a fresh silence window', async () => {
+    vi.useFakeTimers()
+    try {
+      // Every home listing hangs: the initial open's scan is the one the
+      // close interrupts, and the reopen's scan proves the fresh window.
+      const settlers: ((value: DirectoryListing) => void)[] = []
+      const listDirectory = vi.fn((_path?: string, _signal?: AbortSignal) =>
+        new Promise<DirectoryListing>((resolve) => { settlers.push(resolve) }))
+      const { view, props } = mount({ listDirectory })
+      await act(async () => { vi.advanceTimersByTime(300) })
+      expect(screen.getByText('browser.loading')).toBeTruthy()
+      // Close while the scan is in flight, then reopen: the first frame must
+      // wait out a fresh silence window, not inherit the armed indicator.
+      view.rerender(<DirectoryBrowser {...props} open={false} />)
+      view.rerender(<DirectoryBrowser {...props} open />)
+      await act(async () => {})
+      expect(screen.queryByText('browser.loading')).toBeNull()
+      await act(async () => { vi.advanceTimersByTime(300) })
+      expect(screen.getByText('browser.loading')).toBeTruthy()
+      // The reopened scan settles normally.
+      await act(async () => { settlers.at(-1)!(listingFor(undefined)) })
+      expect(screen.queryByText('browser.loading')).toBeNull()
+      expect(screen.getByText('Documents')).toBeTruthy()
+    } finally {
+      vi.useRealTimers()
+    }
+  })
+
+  it('keeps the single-pane landing when the truncated parent level lacks the target', async () => {
+    const listDirectory = vi.fn(async (path?: string) => {
+      // The parent leg names HOME explicitly; serve it a truncated window
+      // that misses Documents (the initial open uses the absent-path form).
+      if (path === HOME) return { ...listingFor(HOME), entries: [], truncated: true }
+      return listingFor(path)
+    })
+    mount({ listDirectory })
+    await waitFor(() => { expect(screen.getByRole('listitem')).toBeTruthy() })
+    fireEvent.click(screen.getByRole('button', { name: 'browser.editPath' }))
+    fireEvent.change(screen.getByLabelText<HTMLInputElement>('browser.editPath'), { target: { value: DOCS } })
+    fireEvent.keyDown(screen.getByLabelText('browser.editPath'), { key: 'Enter' })
+    await waitFor(() => { expect(screen.getByRole('listitem').textContent).toBe('harness') })
+    // The upgrade would orphan the selection (no source row): it stays off.
+    await act(async () => {})
+    expect(columns()).toHaveLength(1)
+    expect(screen.queryByText('browser.truncated')).toBeNull()
+  })
+
+  it('anchors the upgrade on the parent level actual entry under Windows case folding', async () => {
+    const ROOT = 'C:\\'
+    const TYPED = 'c:\\users'
+    const winRoot: DirectoryListing = {
+      path: ROOT,
+      home: ROOT,
+      crumbs: [{ name: 'C:\\', path: ROOT, hidden: false }],
+      entries: [{ name: 'Users', path: 'C:\\Users', hidden: false }],
+      truncated: false,
+    }
+    const winUsers: DirectoryListing = {
+      path: TYPED,
+      home: ROOT,
+      crumbs: [{ name: 'C:\\', path: ROOT, hidden: false }, { name: 'users', path: TYPED, hidden: false }],
+      entries: [],
+      truncated: false,
+    }
+    mount({ listDirectory: vi.fn(async (path?: string) => (path === TYPED ? winUsers : winRoot)) })
+    await waitFor(() => { expect(screen.getByRole('listitem')).toBeTruthy() })
+    fireEvent.click(screen.getByRole('button', { name: 'browser.editPath' }))
+    fireEvent.change(screen.getByLabelText<HTMLInputElement>('browser.editPath'), { target: { value: TYPED } })
+    fireEvent.keyDown(screen.getByLabelText('browser.editPath'), { key: 'Enter' })
+    // The typed case differs from the real entry; the upgrade selects the
+    // parent level's ACTUAL entry so aria-current and exemptions hold.
+    await waitFor(() => {
+      expect(rowButton(within(columns()[0]!).getByRole('listitem')).getAttribute('aria-current')).toBe('true')
+    })
+    expect(within(columns()[0]!).getByText('Users')).toBeTruthy()
+  })
+
+  it('re-parks focus on the edit zone when a failed pick unmounts a dot-revealed row', async () => {
+    const listDirectory = vi.fn(async (path?: string) => {
+      if (path === `${HOME}/.config`) {
+        throw new DirectoryBrowseError({ code: 'directory-unreadable', message: 'denied', details: { path } })
+      }
+      return listingFor(path)
+    })
+    mount({ listDirectory })
+    await waitFor(() => { expect(screen.getByRole('listitem')).toBeTruthy() })
+    fireEvent.click(screen.getByRole('button', { name: 'browser.editPath' }))
+    fireEvent.change(screen.getByLabelText<HTMLInputElement>('browser.editPath'), { target: { value: `${HOME}/.co` } })
+    const row = rowButton(screen.getByRole('listitem'))
+    fireEvent.mouseDown(row)
+    fireEvent.click(row)
+    // The failed selection re-hides the picked row; focus fell to body and
+    // re-parks on the crumb edit zone.
+    await screen.findByRole('alert')
+    expect(screen.queryByText('.config')).toBeNull()
+    expect(document.activeElement).toBe(screen.getByRole('button', { name: 'browser.editPath' }))
+  })
+
+  it('leaves focus on a surviving row when its pick fails', async () => {
+    const listDirectory = vi.fn(async (path?: string) => {
+      if (path === DOCS) {
+        throw new DirectoryBrowseError({ code: 'directory-unreadable', message: 'denied', details: { path } })
+      }
+      return listingFor(path)
+    })
+    mount({ listDirectory })
+    await waitFor(() => { expect(screen.getByRole('listitem')).toBeTruthy() })
+    fireEvent.click(screen.getByRole('button', { name: 'browser.editPath' }))
+    fireEvent.change(screen.getByLabelText<HTMLInputElement>('browser.editPath'), { target: { value: `${HOME}/do` } })
+    const row = rowButton(screen.getByRole('listitem'))
+    row.focus()
+    fireEvent.mouseDown(row)
+    fireEvent.click(row)
+    // Documents survives the cleared selection (it is not hidden): the
+    // user's focus on it is not yanked to the edit zone.
+    await screen.findByRole('alert')
+    expect(document.activeElement).toBe(row)
+  })
+
+  it('falls back to the single-pane landing when the parent leg of a navigation fails', async () => {
+    const listDirectory = vi.fn(async (path?: string) => {
+      // The initial open lists home through the absent-path form; only the
+      // parent leg names HOME explicitly.
+      if (path === HOME) {
+        throw new DirectoryBrowseError({ code: 'directory-unreadable', message: 'parent gone', details: { path } })
+      }
+      return listingFor(path)
+    })
+    mount({ listDirectory })
+    await waitFor(() => { expect(screen.getByRole('listitem')).toBeTruthy() })
+    fireEvent.click(screen.getByRole('button', { name: 'browser.editPath' }))
+    fireEvent.change(screen.getByLabelText<HTMLInputElement>('browser.editPath'), { target: { value: DOCS } })
+    fireEvent.keyDown(screen.getByLabelText('browser.editPath'), { key: 'Enter' })
+    // The target listed fine; the failed parent leg neither blocks the
+    // landing nor surfaces an error for a level nobody asked to see.
+    await waitFor(() => { expect(screen.getByRole('listitem').textContent).toBe('harness') })
+    expect(columns()).toHaveLength(1)
+    expect(screen.queryByRole('alert')).toBeNull()
+  })
+
   it('opens the selection, else the listed level; Cancel closes; busy freezes Open', async () => {
     const b = mount()
     await waitFor(() => { expect(screen.getByRole('listitem')).toBeTruthy() })
@@ -186,18 +620,221 @@ describe('DirectoryBrowser', () => {
     await waitFor(() => { expect(screen.getByRole('listitem')).toBeTruthy() })
     fireEvent.click(screen.getByRole('button', { name: 'browser.editPath' }))
     const input = screen.getByLabelText<HTMLInputElement>('browser.editPath')
-    expect(input.value).toBe(HOME)
+    // The editor seeds with a trailing separator so typing continues into
+    // child names.
+    expect(input.value).toBe(`${HOME}/`)
     fireEvent.change(input, { target: { value: DOCS } })
     fireEvent.keyDown(input, { key: 'Enter' })
-    await waitFor(() => { expect(screen.getByRole('listitem').textContent).toBe('harness') })
-    expect(columns()).toHaveLength(1)
+    // Away from the root a navigation lands two-pane: the target selected
+    // in its parent level, its own children on the right.
+    await waitFor(() => { expect(columns()).toHaveLength(2) })
+    expect(rowButton(within(columns()[0]!).getByRole('listitem')).getAttribute('aria-current')).toBe('true')
+    expect(within(columns()[1]!).getByText('harness')).toBeTruthy()
+    // The submitted navigation unmounted the focused input; focus parks on
+    // the crumb edit zone that replaced it.
+    expect(document.activeElement).toBe(screen.getByRole('button', { name: 'browser.editPath' }))
     fireEvent.click(screen.getByRole('button', { name: 'browser.editPath' }))
     const again = screen.getByLabelText<HTMLInputElement>('browser.editPath')
     fireEvent.change(again, { target: { value: '   ' } })
     fireEvent.keyDown(again, { key: 'Enter' })
-    expect(b.listDirectory).toHaveBeenCalledTimes(2)
+    // Initial home + the DOCS target leg + its parent leg; the blank draft
+    // added none.
+    expect(b.listDirectory).toHaveBeenCalledTimes(3)
     fireEvent.keyDown(again, { key: 'Escape' })
     expect(screen.queryByLabelText('browser.editPath', { selector: 'input' })).toBeNull()
+    // Escape with focus in the input parks focus on the returning edit zone.
+    expect(document.activeElement).toBe(screen.getByRole('button', { name: 'browser.editPath' }))
+  })
+
+  it('prefix-filters the listed level from the draft tail, dot revealing hidden matches', async () => {
+    mount()
+    await waitFor(() => { expect(screen.getByRole('listitem')).toBeTruthy() })
+    fireEvent.click(screen.getByRole('button', { name: 'browser.editPath' }))
+    const input = screen.getByLabelText<HTMLInputElement>('browser.editPath')
+    // The seeded empty segment leaves the level as-is: hidden stays hidden.
+    expect(screen.getByRole('listitem').textContent).toBe('Documents')
+    // Case-insensitive prefix narrows the rows.
+    fireEvent.change(input, { target: { value: `${HOME}/do` } })
+    expect(screen.getByRole('listitem').textContent).toBe('Documents')
+    // A dot-led prefix names hidden entries, so it reveals the match.
+    fireEvent.change(input, { target: { value: `${HOME}/.co` } })
+    expect(screen.getByRole('listitem').textContent).toBe('.config')
+    // A prefix matching nothing empties the level (no stale rows linger).
+    fireEvent.change(input, { target: { value: `${HOME}/zzz` } })
+    expect(screen.queryByRole('listitem')).toBeNull()
+    // A draft naming some other directory (or none) leaves the level whole.
+    fireEvent.change(input, { target: { value: 'no-separator' } })
+    expect(screen.getByRole('listitem').textContent).toBe('Documents')
+  })
+
+  it('filters the child pane in two-pane mode and follows the draft back up a level', async () => {
+    mount()
+    await waitFor(() => { expect(screen.getByRole('listitem')).toBeTruthy() })
+    fireEvent.click(rowButton(screen.getByRole('listitem')))
+    await waitFor(() => { expect(columns()).toHaveLength(2) })
+    fireEvent.click(screen.getByRole('button', { name: 'browser.editPath' }))
+    const input = screen.getByLabelText<HTMLInputElement>('browser.editPath')
+    // The seed comes from the selection, so the draft tail addresses the
+    // RIGHT pane (the selection's children).
+    expect(input.value).toBe(`${DOCS}/`)
+    fireEvent.change(input, { target: { value: `${DOCS}/h` } })
+    expect(within(columns()[1]!).getByText('harness')).toBeTruthy()
+    fireEvent.change(input, { target: { value: `${DOCS}/zzz` } })
+    expect(within(columns()[1]!).queryAllByRole('listitem')).toHaveLength(0)
+    expect(within(columns()[0]!).getByText('Documents')).toBeTruthy()
+    // Erasing back into the parent's own path moves the filter to the LEFT
+    // pane and releases the right one. The selected row is exempt (it
+    // anchors the two-pane view), so it alone survives the miss.
+    fireEvent.change(input, { target: { value: `${HOME}/zz` } })
+    expect(within(columns()[0]!).getAllByRole('listitem').map(item => item.textContent)).toEqual(['Documents'])
+    expect(within(columns()[1]!).getByText('harness')).toBeTruthy()
+  })
+
+  it('keeps the draft and filter through window focus loss and in-dialog focus moves', async () => {
+    mount()
+    await waitFor(() => { expect(screen.getByRole('listitem')).toBeTruthy() })
+    fireEvent.click(screen.getByRole('button', { name: 'browser.editPath' }))
+    const input = screen.getByLabelText<HTMLInputElement>('browser.editPath')
+    fireEvent.change(input, { target: { value: `${HOME}/do` } })
+    // A blur while the document itself lost focus (window switch, dev-tools
+    // focus) must not discard the draft: value and filter both survive.
+    const hasFocus = vi.spyOn(document, 'hasFocus').mockReturnValue(false)
+    fireEvent.focusOut(input)
+    hasFocus.mockRestore()
+    expect(screen.getByLabelText<HTMLInputElement>('browser.editPath', { selector: 'input' }).value).toBe(`${HOME}/do`)
+    expect(screen.getByRole('listitem').textContent).toBe('Documents')
+    // A keyboard focus move that stays inside the dialog (Tab onto the
+    // filtered row) keeps the draft too — the results stay reachable.
+    fireEvent.focusOut(input, { relatedTarget: rowButton(screen.getByRole('listitem')) })
+    expect(screen.getByLabelText<HTMLInputElement>('browser.editPath', { selector: 'input' }).value).toBe(`${HOME}/do`)
+    // Toggling show-hidden mid-edit suppresses focus steal: the draft and
+    // its filter survive the toggle in both directions.
+    const toggle = screen.getByRole('button', { name: 'browser.showHidden' })
+    fireEvent.mouseDown(toggle)
+    fireEvent.click(toggle)
+    expect(toggle.getAttribute('aria-pressed')).toBe('true')
+    expect(screen.getByLabelText<HTMLInputElement>('browser.editPath', { selector: 'input' }).value).toBe(`${HOME}/do`)
+    expect(screen.getByRole('listitem').textContent).toBe('Documents')
+    // Focus landing outside the dialog cancels like Escape — even when the
+    // departure happens from a row the user had Tabbed onto, not the input
+    // (the observer lives on the card scope, not the input).
+    fireEvent.focusOut(rowButton(screen.getByRole('listitem')), { relatedTarget: document.body })
+    expect(screen.queryByLabelText('browser.editPath', { selector: 'input' })).toBeNull()
+    // Outside editing the card-scope observer is inert.
+    fireEvent.focusOut(screen.getByRole('button', { name: 'browser.showHidden' }))
+    expect(screen.getByRole('button', { name: 'browser.editPath' })).toBeTruthy()
+  })
+
+  it('Escape with focus on a filtered row collapses the editor, not the dialog', async () => {
+    const b = mount()
+    await waitFor(() => { expect(screen.getByRole('listitem')).toBeTruthy() })
+    fireEvent.click(screen.getByRole('button', { name: 'browser.editPath' }))
+    const input = screen.getByLabelText<HTMLInputElement>('browser.editPath')
+    fireEvent.change(input, { target: { value: `${HOME}/do` } })
+    // Tab parked focus on the result row; Escape must still mean "leave
+    // path editing", not "close the whole dialog".
+    const row = rowButton(screen.getByRole('listitem'))
+    row.focus()
+    fireEvent.keyDown(row, { key: 'Escape' })
+    expect(screen.queryByLabelText('browser.editPath', { selector: 'input' })).toBeNull()
+    expect(b.onClose).not.toHaveBeenCalled()
+    // Focus was already on a surviving row, so nothing re-parks it.
+    expect(document.activeElement).toBe(row)
+    // With no draft left, Escape falls through to the Modal and closes.
+    fireEvent.keyDown(row, { key: 'Escape' })
+    expect(b.onClose).toHaveBeenCalledTimes(1)
+  })
+
+  it('a picked dot-revealed hidden row stays visible as the selection', async () => {
+    mount()
+    await waitFor(() => { expect(screen.getByRole('listitem')).toBeTruthy() })
+    fireEvent.click(screen.getByRole('button', { name: 'browser.editPath' }))
+    const input = screen.getByLabelText<HTMLInputElement>('browser.editPath')
+    fireEvent.change(input, { target: { value: `${HOME}/.co` } })
+    const row = rowButton(screen.getByRole('listitem'))
+    expect(row.textContent).toBe('.config')
+    fireEvent.mouseDown(row)
+    fireEvent.click(row)
+    // The pick cleared the draft (and with it the dot-reveal), but the
+    // selection is exempt from the hidden filter: the anchor row survives.
+    expect(screen.queryByLabelText('browser.editPath', { selector: 'input' })).toBeNull()
+    await waitFor(() => { expect(columns()).toHaveLength(2) })
+    expect(within(columns()[0]!).getByText('.config')).toBeTruthy()
+  })
+
+  it('picking a filtered row adopts it and closes the path editor', async () => {
+    mount()
+    await waitFor(() => { expect(screen.getByRole('listitem')).toBeTruthy() })
+    fireEvent.click(screen.getByRole('button', { name: 'browser.editPath' }))
+    const input = screen.getByLabelText<HTMLInputElement>('browser.editPath')
+    fireEvent.change(input, { target: { value: `${HOME}/do` } })
+    // The row suppresses focus steal on mousedown (no blur-cancel unmounts
+    // the filtered rows mid-gesture), then the click both selects the row
+    // and closes the editor.
+    const row = rowButton(screen.getByRole('listitem'))
+    fireEvent.mouseDown(row)
+    fireEvent.click(row)
+    expect(screen.queryByLabelText('browser.editPath', { selector: 'input' })).toBeNull()
+    // Focus parks on the picked row (the editor's input just unmounted and
+    // the Modal has no focus trap to catch a fall to body).
+    expect(document.activeElement).toBe(row)
+    await waitFor(() => { expect(columns()).toHaveLength(2) })
+    expect(screen.getByRole('button', { name: 'browser.home' })).toBeTruthy()
+  })
+
+  it('a right-pane pick while editing parks focus on the advanced selection', async () => {
+    mount()
+    await waitFor(() => { expect(screen.getByRole('listitem')).toBeTruthy() })
+    fireEvent.click(rowButton(screen.getByRole('listitem')))
+    await waitFor(() => { expect(columns()).toHaveLength(2) })
+    fireEvent.click(screen.getByRole('button', { name: 'browser.editPath' }))
+    const input = screen.getByLabelText<HTMLInputElement>('browser.editPath')
+    fireEvent.change(input, { target: { value: `${DOCS}/h` } })
+    // The advance replaces BOTH panes (the picked button's own column
+    // unmounts), so focus is re-parked on the selection's aria-current row
+    // in the freshly rendered left pane rather than the clicked node.
+    const row = rowButton(within(columns()[1]!).getByRole('listitem'))
+    fireEvent.mouseDown(row)
+    fireEvent.click(row)
+    expect(screen.queryByLabelText('browser.editPath', { selector: 'input' })).toBeNull()
+    await waitFor(() => { expect(document.activeElement?.textContent).toBe('harness') })
+    expect(document.activeElement?.getAttribute('aria-current')).toBe('true')
+  })
+
+  it('seeds and filters with backslashes on a Windows-rooted listing', async () => {
+    const ROOT = 'C:\\'
+    const windowsListing: DirectoryListing = {
+      path: ROOT,
+      home: ROOT,
+      crumbs: [{ name: 'C:\\', path: ROOT, hidden: false }],
+      entries: [
+        { name: 'Program Files', path: `${ROOT}Program Files`, hidden: false },
+        { name: 'Users', path: `${ROOT}Users`, hidden: false },
+      ],
+      truncated: false,
+    }
+    mount({ listDirectory: vi.fn(async () => windowsListing) })
+    await waitFor(() => { expect(screen.getAllByRole('listitem')).toHaveLength(2) })
+    fireEvent.click(screen.getByRole('button', { name: 'browser.editPath' }))
+    const input = screen.getByLabelText<HTMLInputElement>('browser.editPath')
+    // The root already ends in its separator: no doubled backslash.
+    expect(input.value).toBe(ROOT)
+    fireEvent.change(input, { target: { value: `${ROOT}u` } })
+    expect(screen.getByRole('listitem').textContent).toBe('Users')
+  })
+
+  it('clicking away from the path editor cancels it back to the crumb view', async () => {
+    mount()
+    await waitFor(() => { expect(screen.getByRole('listitem')).toBeTruthy() })
+    fireEvent.click(screen.getByRole('button', { name: 'browser.editPath' }))
+    const input = screen.getByLabelText<HTMLInputElement>('browser.editPath')
+    fireEvent.change(input, { target: { value: '/somewhere/else' } })
+    // Focus moving anywhere outside the editor abandons the draft like Escape.
+    fireEvent.focusOut(input)
+    expect(screen.queryByLabelText('browser.editPath', { selector: 'input' })).toBeNull()
+    // The crumb view is back and the abandoned draft was never navigated to.
+    expect(screen.getByRole('button', { name: 'browser.editPath' })).toBeTruthy()
+    expect(screen.getByRole('listitem').textContent).toBe('Documents')
   })
 
   it('restarts the home listing when Escape cancels an edit opened before any level listed', async () => {
@@ -713,11 +1350,13 @@ describe('DirectoryBrowser', () => {
     b.listDirectory.mockReturnValueOnce(slow)
     fireEvent.click(screen.getByRole('button', { name: 'browser.home' }))
     fireEvent.click(within(screen.getByRole('navigation')).getByRole('button', { name: 'Documents' }))
-    await waitFor(() => { expect(screen.getByRole('listitem').textContent).toBe('harness') })
+    // The newer jump lands two-pane: Documents selected at home, children right.
+    await waitFor(() => { expect(within(columns()[1]!).getByText('harness')).toBeTruthy() })
     resolveSlow(listingFor(undefined))
     await new Promise(settle => setTimeout(settle, 0))
-    // The stale home listing did not replace the newer Documents level.
-    expect(screen.getByRole('listitem').textContent).toBe('harness')
+    // The stale home listing did not replace the newer Documents landing.
+    expect(columns()).toHaveLength(2)
+    expect(within(columns()[1]!).getByText('harness')).toBeTruthy()
   })
 
   it('names the create target by its path when the level reports no crumbs', async () => {

packages/pty/README.i18n.yaml

@@ -2,5 +2,5 @@
 # side as of the last confirmed-consistent state. Both languages carry equal authority;
 # after editing either side, bring the other along and re-record with:
 #   pnpm run verify-translation-pairing --write packages/pty/README.md
-README.md: a9121455519a5f83a63a005cb857fec0f0e06b92
-README.zh.md: 4e36ef934d31861d72748b9b9585695f86749171
+README.md: e54dcf64db083665f37b7dc19a7a92e21494442b
+README.zh.md: 0bb7e565a5799002ffb8b74dce12e129a7b2665e

packages/pty/README.md

@@ -9,5 +9,6 @@ English | [中文](README.zh.md)
 | [`pty`](pty/README.md) (`@deepseek-ai/dsh-pty`) | Backend registry, branded ids, exact-Agent ownership, session operations, and awaited cleanup | `ctx.pty` |
 | `pty-local` (`@deepseek-ai/dsh-pty-local`) | Local `node-pty` backend, readiness detection, bounded terminal state, sandboxing, and process-session supervision | registers on `ctx.pty` |
 | `tool-pty` (`@deepseek-ai/dsh-tool-pty`) | Six model-facing tools and generic task integration for background sends | registers on `ctx.tools` |
+| `tool-bash-persistent` (`@deepseek-ai/dsh-tool-bash-persistent`) | One model-facing `bash` backed by an owner-scoped reusable PTY shell | consumes `ctx.pty`, registers on `ctx.tools` |
 
 The design and deferred boundaries live in the [persistent PTY Agent Note](../../.agents/notes/implemented/feature/2026-07-16-persistent-pty-sessions.md).

packages/pty/README.zh.md

@@ -9,5 +9,6 @@
 | [`pty`](pty/README.md)（`@deepseek-ai/dsh-pty`） | 后端注册表、品牌化 id、精确到 agent（智能体）的所有权、会话操作与等待清理完成的机制 | `ctx.pty` |
 | `pty-local`（`@deepseek-ai/dsh-pty-local`） | 本地 `node-pty` 后端、就绪检测、有界终端状态、沙箱与进程会话监管 | 注册到 `ctx.pty` |
 | `tool-pty`（`@deepseek-ai/dsh-tool-pty`） | 6 个面向模型的工具，以及用于后台发送的通用任务集成 | 注册到 `ctx.tools` |
+| `tool-bash-persistent`（`@deepseek-ai/dsh-tool-bash-persistent`） | 一个由所有者隔离可复用 PTY shell 支撑的模型可见 `bash` | 消费 `ctx.pty`，注册到 `ctx.tools` |
 
 设计与暂缓边界记录在[持久 PTY Agent Note（agent 决策记录）](../../.agents/notes/implemented/feature/2026-07-16-persistent-pty-sessions.md) 中。

packages/pty/tool-bash-persistent/README.i18n.yaml

@@ -0,0 +1,6 @@
+# Bilingual-pair consistency record (docs/i18n/README.md): the git blob hash of each
+# side as of the last confirmed-consistent state. Both languages carry equal authority;
+# after editing either side, bring the other along and re-record with:
+#   pnpm run verify-translation-pairing --write packages/pty/tool-bash-persistent/README.md
+README.md: cfb3acf41803f5b06ecb3f56ee8ffc29ce9147b1
+README.zh.md: a525485933344a8f9bc218456c099efdef572902

packages/pty/tool-bash-persistent/README.md

@@ -0,0 +1,50 @@
+# @deepseek-ai/dsh-tool-bash-persistent
+
+English | [中文](README.zh.md)
+
+Model-facing `bash(command)` backed by one owner-scoped `ctx.pty` shell. The package owns the tool contract and shell reuse; deployments select the PTY backend and sandbox policy.
+
+## Config
+
+| Key | Default | Meaning |
+|---|---:|---|
+| `backendType` | `shell` | Registered PTY backend used for each Agent shell. |
+| `timeoutMs` | `300000` | Wall-clock limit for one command; timeout closes the shell. |
+| `maxOutputChars` | `16000` | Maximum retained command-output characters; fixed diagnostics are added afterward. |
+| `description` | Persistent-shell description | Model-facing environment contract. |
+
+## Model Experience
+
+### Tool schema
+
+#### What the model sees
+
+The generated [`bash` schema](../../../docs/tool-catalog.md#deepseek-aidsh-tool-bash-persistent), including the configured `description`. The plugin contributes no standalone system-prompt section; the deployment owns persona and environment guidance.
+
+#### Token effect
+
+Fixed schema cost while `bash` is visible.
+
+#### KV Cache effect
+
+Prefix-stable while the configured description and schema remain unchanged.
+
+### Tool results
+
+#### What the model sees
+
+Commands share one shell per Agent, so cwd, exported variables, activated environments, functions, and background jobs persist across calls. Results exclude private completion markers and the shell prompt. A nonzero wrapped command appends `[exit code: N]`; a shell that exits before reporting that status instead appends `[shell exited: code N]`, `[shell killed by signal: SIG]`, or `[shell exited]` when the backend supplies neither, then resets and tells the model that the next call starts fresh. Long output keeps the earliest retained prefix plus a clipping notice. If the PTY has already dropped that prefix, the result says so explicitly instead of presenting a tail as complete output. Timeout returns bounded partial output, closes the uncertain shell, and reports the reset.
+
+#### Token effect
+
+Data-dependent. `maxOutputChars` bounds retained command output; fixed clipping, lost-prefix, status, timeout, and reset diagnostics can extend the result.
+
+#### KV Cache effect
+
+Append-only tool results follow the reusable request prefix.
+
+## Known Limitations and Deferred Work
+
+- The tool requires an owning Agent and a real PTY backend.
+- Explicit `exit` and timeout discard shell state. Cancellation also resets and discards the result, even when a complete status marker is already observable; the next call starts a fresh shell.
+- Environment facts such as network access and package mirrors belong in the configured `description`, not this package's default.

packages/pty/tool-bash-persistent/README.zh.md

@@ -0,0 +1,50 @@
+# @deepseek-ai/dsh-tool-bash-persistent
+
+[English](README.md) | 中文
+
+模型可见的 `bash(command)`，底层复用一个按所有者隔离的 `ctx.pty` shell。该包拥有工具契约和 shell 复用；PTY 后端与沙箱策略由部署选择。
+
+## 配置
+
+| 键 | 默认值 | 含义 |
+|---|---:|---|
+| `backendType` | `shell` | 每个 Agent shell 使用的已注册 PTY 后端。 |
+| `timeoutMs` | `300000` | 单条命令的墙钟时间上限；超时会关闭 shell。 |
+| `maxOutputChars` | `16000` | 命令输出最多保留的字符数；固定诊断会在此后追加。 |
+| `description` | 持久 shell 描述 | 面向模型的环境契约。 |
+
+## 模型体验
+
+### 工具 schema
+
+#### 模型所见
+
+生成的 [`bash` schema](../../../docs/tool-catalog.md#deepseek-aidsh-tool-bash-persistent)，其中包含配置的 `description`。本插件不贡献独立系统提示词段；persona 与环境指导由部署负责。
+
+#### Token 影响
+
+`bash` 可见时产生固定的 schema 成本。
+
+#### KV Cache 影响
+
+配置的描述与 schema 不变时前缀稳定。
+
+### 工具结果
+
+#### 模型所见
+
+每个 Agent 的命令共享一个 shell，因此 cwd、导出的环境变量、已激活环境、函数和后台任务会跨调用保留。结果不包含私有完成标记和 shell 提示符。经封装的命令以非零状态结束时，结果会追加 `[exit code: N]`；若 shell 在报告该状态前退出，则改为追加 `[shell exited: code N]`、`[shell killed by signal: SIG]`，或在后端既未提供退出码也未提供信号时追加 `[shell exited]`；随后重置 shell，并告知模型下次调用从新 shell 开始。长输出保留仍可读取的最早前缀并追加截断提示；若 PTY 已丢弃真正的开头，结果会明确说明，而不是把尾部伪装成完整输出。超时返回有界的部分输出、关闭状态不确定的 shell，并报告该重置。
+
+#### Token 影响
+
+随数据变化。`maxOutputChars` 限制保留的命令输出；固定的截断、前缀丢失、状态、超时与重置诊断可能使结果更长。
+
+#### KV Cache 影响
+
+工具结果以追加方式位于可复用请求前缀之后。
+
+## 已知限制与延后工作
+
+- 工具需要拥有它的 Agent 和真实 PTY 后端。
+- 显式 `exit` 与超时会丢弃 shell 状态。取消同样会重置 shell 并丢弃结果，即使已经能观察到完整状态标记也是如此；下次调用创建新 shell。
+- 网络访问、软件包镜像等环境事实应写入配置的 `description`，而非包默认描述。

packages/pty/tool-bash-persistent/package.json

@@ -0,0 +1,55 @@
+{
+  "name": "@deepseek-ai/dsh-tool-bash-persistent",
+  "description": "Model-facing owner-scoped persistent Bash tool backed by the Harness PTY service",
+  "version": "0.0.1",
+  "private": true,
+  "type": "module",
+  "main": "lib/index.js",
+  "types": "lib/types/index.d.ts",
+  "exports": {
+    ".": {
+      "types": "./lib/types/index.d.ts",
+      "default": "./lib/index.js"
+    },
+    "./invariant": {
+      "types": "./lib/types/invariant.d.ts",
+      "default": "./lib/invariant.js"
+    },
+    "./package.json": "./package.json"
+  },
+  "files": [
+    "lib/index.js",
+    "lib/invariant.js",
+    "lib/types/**/*.d.ts",
+    "lib/types/**/*.d.ts.map",
+    "src"
+  ],
+  "license": "BSD-3-Clause",
+  "peerDependencies": {
+    "@deepseek-ai/dsh-agent": "^0.0.1",
+    "@deepseek-ai/dsh-invariants": "^0.0.1",
+    "@deepseek-ai/dsh-pty": "^0.0.1",
+    "@deepseek-ai/dsh-timeout": "^0.0.1",
+    "@deepseek-ai/dsh-tools": "^0.0.1",
+    "cordis": "^4.0.0-rc.7"
+  },
+  "dependencies": {
+    "schemastery": "^3.18.0"
+  },
+  "devDependencies": {
+    "@cordisjs/plugin-include": "workspace:^",
+    "@cordisjs/plugin-loader": "workspace:^",
+    "@deepseek-ai/dsh-agent": "workspace:^",
+    "@deepseek-ai/dsh-invariants": "workspace:^",
+    "@deepseek-ai/dsh-llm": "workspace:^",
+    "@deepseek-ai/dsh-pty": "workspace:^",
+    "@deepseek-ai/dsh-pty-local": "workspace:^",
+    "@deepseek-ai/dsh-sandbox": "workspace:^",
+    "@deepseek-ai/dsh-sandbox-policy": "workspace:^",
+    "@deepseek-ai/dsh-session": "workspace:^",
+    "@deepseek-ai/dsh-system-prompt": "workspace:^",
+    "@deepseek-ai/dsh-timeout": "workspace:^",
+    "@deepseek-ai/dsh-tools": "workspace:^",
+    "cordis": "^4.0.0-rc.7"
+  }
+}

packages/pty/tool-bash-persistent/src/index.ts

@@ -0,0 +1,445 @@
+/**
+ * Model-facing persistent `bash` tool over the owner-scoped PTY seam.
+ * @module @deepseek-ai/dsh-tool-bash-persistent
+ */
+
+import { randomUUID } from 'node:crypto'
+import type { Context } from 'cordis'
+import z from 'schemastery'
+import type { Agent } from '@deepseek-ai/dsh-agent'
+import type { PtyReadResult, PtySendResult, PtySessionId } from '@deepseek-ai/dsh-pty'
+import { deadline, timeoutOf } from '@deepseek-ai/dsh-timeout'
+import { defineTool } from '@deepseek-ai/dsh-tools'
+
+// TODO: Replace the file-search advice; arbitrary command output need not come from a searchable file.
+const TRUNCATED_MESSAGE = '<response clipped><NOTE>To save on context only part of this file has been shown to you. You should retry this tool after you have searched inside the file with `grep -n` in order to find the line numbers of what you are looking for.</NOTE>'
+const LOST_PREFIX_MESSAGE = '<response clipped><NOTE>The beginning of this command output was dropped by the terminal scrollback limit. The following text is the earliest retained output.</NOTE>\n'
+const SHELL_RESET_MESSAGE = 'The persistent bash shell was reset; the next bash call starts from the workspace with a fresh current directory and environment.'
+const SHELL_PROMPT = '__DSH_PERSISTENT_BASH_PROMPT__ '
+const TIMEOUT_CODE = 'PERSISTENT_BASH_TIMEOUT'
+// One page is enough to find a just-emitted completion marker; the full
+// scrollback is assembled only when a command settles or needs partial output.
+const SCROLLBACK_PAGE_LINES = 1_000
+const POLL_INTERVAL_MS = 25
+
+const DEFAULT_DESCRIPTION = 'Run commands in a persistent bash shell. State, including the current directory and exported environment variables, persists across calls for this agent.'
+
+interface ResolvedConfig {
+  backendType: string
+  timeoutMs: number
+  maxOutputChars: number
+  description: string
+}
+
+interface CommandMarkers {
+  start: string
+  end: string
+}
+
+interface RetainedOutput {
+  text: string
+  truncated: boolean
+}
+
+interface CapturedOutput {
+  text: string
+  incomplete: boolean
+  exitCode?: number
+}
+
+interface PersistentShells {
+  get(owner: Agent, signal: AbortSignal): Promise<PtySessionId>
+  reset(owner: Agent, reason: string): Promise<void>
+}
+
+function maybeTruncate(content: string, maxOutputChars: number, incomplete = false): string {
+  if (content.length <= maxOutputChars && !incomplete) return content
+  return content.length <= maxOutputChars
+    ? content + TRUNCATED_MESSAGE
+    : content.slice(0, maxOutputChars) + TRUNCATED_MESSAGE
+}
+
+function markers(): CommandMarkers {
+  const nonce = randomUUID()
+  return {
+    start: `__DSH_PERSISTENT_BASH_START_${nonce}__`,
+    end: `__DSH_PERSISTENT_BASH_END_${nonce}:`,
+  }
+}
+
+function quoteForBash(value: string): string {
+  return `$'${value
+    .replaceAll('\\', '\\\\')
+    .replaceAll("'", "\\'")
+    .replaceAll('\r', '\\r')
+    .replaceAll('\n', '\\n')}'`
+}
+
+function wrapCommand(command: string, marker: CommandMarkers): string {
+  // Keep the wrapper on one physical line. An interactive bash prints PS2 for
+  // embedded newlines before executing the buffer, which would leak terminal
+  // prompts and marker source text into the model-facing result.
+  return `printf '%s\\n' ${quoteForBash(marker.start)}; eval -- ${quoteForBash(command)}; __dsh_persistent_bash_status=$?; printf '%s%s\\n' ${quoteForBash(marker.end)} "$__dsh_persistent_bash_status"`
+}
+
+function stripPrompt(text: string): string {
+  let result = text.replace(/\r?\n$/, '')
+  while (result.endsWith(SHELL_PROMPT)) {
+    result = result.slice(0, -SHELL_PROMPT.length)
+  }
+  return result.endsWith('\n') ? result.slice(0, -1) : result
+}
+
+function commandOutput(
+  snapshot: RetainedOutput,
+  marker: CommandMarkers,
+): CapturedOutput | undefined {
+  const text = snapshot.text
+  const end = text.lastIndexOf(marker.end)
+  const status = /^(\d+)\r?\n/.exec(text.slice(end + marker.end.length))?.[1]
+  if (status === undefined) return undefined
+  const startMarker = text.lastIndexOf(marker.start, end)
+  const start = startMarker < 0 ? 0 : startMarker + marker.start.length
+  return {
+    text: stripPrompt(text.slice(start, end).replace(/^\r?\n/, '')),
+    incomplete: startMarker < 0,
+    exitCode: Number(status),
+  }
+}
+
+function promptCompleted(result: PtySendResult): boolean {
+  return result.viewport.endsWith(SHELL_PROMPT)
+    || result.viewport.endsWith(`${SHELL_PROMPT}\r\n`)
+    || result.viewport.endsWith(`${SHELL_PROMPT}\n`)
+}
+
+function partialOutput(
+  snapshot: RetainedOutput,
+  marker: CommandMarkers,
+  fallback: string,
+  fallbackTruncated = false,
+): CapturedOutput {
+  const startMarker = snapshot.text.lastIndexOf(marker.start)
+  if (startMarker >= 0) {
+    return {
+      text: stripPrompt(snapshot.text.slice(startMarker + marker.start.length).replace(/^\r?\n/, '')),
+      incomplete: false,
+    }
+  }
+  const fallbackStart = fallback.lastIndexOf(marker.start)
+  const afterStart = fallbackStart < 0
+    ? fallback
+    : fallback.slice(fallbackStart + marker.start.length).replace(/^\r?\n/, '')
+  const fallbackEnd = afterStart.lastIndexOf(marker.end)
+  const beforeEnd = fallbackEnd < 0 ? afterStart : afterStart.slice(0, fallbackEnd)
+  return {
+    text: stripPrompt(beforeEnd.replaceAll(SHELL_PROMPT, '')),
+    incomplete: fallbackTruncated || fallbackStart < 0,
+  }
+}
+
+async function pause(): Promise<void> {
+  await new Promise(resolve => setTimeout(resolve, POLL_INTERVAL_MS))
+}
+
+function nextScrollbackOffset(page: PtyReadResult, offset: number): number | undefined {
+  if (page.text.length === 0 || page.lineEnd <= offset) return undefined
+  return page.lineEnd
+}
+
+function retainedScrollback(
+  ctx: Context,
+  owner: Agent,
+  id: PtySessionId,
+  latest = ctx.pty.read(owner, id, { offset: 0, count: SCROLLBACK_PAGE_LINES }),
+): RetainedOutput {
+  const pages: string[] = latest.text.length === 0 ? [] : [latest.text]
+  let offset = latest.lineEnd
+  let truncated = latest.truncated
+  while (true) {
+    if (offset >= latest.totalLines) break
+    const page = ctx.pty.read(owner, id, { offset, count: SCROLLBACK_PAGE_LINES })
+    truncated ||= page.truncated
+    if (page.text.length > 0) pages.unshift(page.text)
+    const next = nextScrollbackOffset(page, offset)
+    if (next === undefined || next >= page.totalLines) break
+    offset = next
+  }
+  return { text: pages.join('\n'), truncated }
+}
+
+function renderCaptured(output: CapturedOutput, maxOutputChars: number): string {
+  const rendered = maybeTruncate(output.text, maxOutputChars, output.incomplete)
+  const withPrefix = output.incomplete && output.text.length > 0
+    ? LOST_PREFIX_MESSAGE + rendered
+    : rendered
+  const marker = output.exitCode !== undefined && output.exitCode !== 0
+    ? `[exit code: ${output.exitCode}]`
+    : undefined
+  return appendStatusMarker(withPrefix, marker)
+}
+
+function appendStatusMarker(content: string, marker: string | undefined): string {
+  if (marker === undefined) return content
+  return content.length === 0 ? marker : `${content}\n${marker}`
+}
+
+function renderShellExitStatus(
+  content: string,
+  exitCode: number | null,
+  signal: NodeJS.Signals | null,
+): string {
+  const marker = signal !== null
+    ? `[shell killed by signal: ${signal}]`
+    : exitCode !== null
+      ? `[shell exited: code ${exitCode}]`
+      : '[shell exited]'
+  return appendStatusMarker(content, marker)
+}
+
+function persistentShells(ctx: Context, config: ResolvedConfig): PersistentShells {
+  const pending = new WeakMap<Agent, Promise<PtySessionId>>()
+  const live = new Map<Agent, PtySessionId>()
+  const creating = new Set<Promise<PtySessionId>>()
+  const ownerCleanupInstalled = new WeakSet<Agent>()
+  const lifecycle = new AbortController()
+
+  const close = async (owner: Agent, id: PtySessionId, reason: string): Promise<void> => {
+    if (!ctx.pty.list(owner).some(snapshot => snapshot.sessionId === id)) return
+    await ctx.pty.kill(owner, id, reason)
+  }
+
+  ctx.effect(() => async () => {
+    lifecycle.abort(new Error('tool-bash-persistent disposed during shell creation'))
+    await Promise.allSettled([...creating])
+    const closing = [...live].map(async ([owner, id]) => { await close(owner, id, 'tool-bash-persistent disposed') })
+    await Promise.all(closing)
+    live.clear()
+  }, 'tool-bash-persistent shell cleanup')
+
+  const reset = async (owner: Agent, reason: string): Promise<void> => {
+    pending.delete(owner)
+    const id = live.get(owner)
+    live.delete(owner)
+    if (id !== undefined) await close(owner, id, reason)
+  }
+
+  const get = (owner: Agent, signal: AbortSignal): Promise<PtySessionId> => {
+    const existing = pending.get(owner)
+    if (existing !== undefined) return existing
+    const combinedSignal = AbortSignal.any([signal, lifecycle.signal])
+    const creation = (async () => {
+      try {
+        const cwd = owner.session.header.cwd
+        const spawned = await ctx.pty.spawn(owner, {
+          type: config.backendType,
+          ...cwd === undefined ? {} : { cwd },
+        }, combinedSignal)
+        live.set(owner, spawned.sessionId)
+        if (!ownerCleanupInstalled.has(owner)) {
+          ownerCleanupInstalled.add(owner)
+          owner.ctx.effect(() => () => {
+            pending.delete(owner)
+            live.delete(owner)
+          }, 'tool-bash-persistent owner cache cleanup')
+        }
+        const setup = ctx.pty.startSend(owner, spawned.sessionId, {
+          text: `stty -echo; PS1=${quoteForBash(SHELL_PROMPT)}`,
+          submit: true,
+          signal: combinedSignal,
+        })
+        const result = await setup.done
+        if (result.sessionStatus.kind === 'exited' || result.waitReason === 'timeout') {
+          throw new Error('persistent bash shell did not accept initialization')
+        }
+        return spawned.sessionId
+      } catch (error: unknown) {
+        await reset(owner, 'persistent bash initialization failed')
+        throw error
+      }
+    })()
+    const tracked = creation.finally(() => {
+      creating.delete(tracked)
+    })
+    creating.add(tracked)
+    pending.set(owner, tracked)
+    return tracked
+  }
+
+  return { get, reset }
+}
+
+async function executeCommand(
+  ctx: Context,
+  shells: PersistentShells,
+  owner: Agent,
+  command: string,
+  config: ResolvedConfig,
+  upstream: AbortSignal,
+): Promise<string> {
+  using commandDeadline = deadline(upstream, config.timeoutMs, TIMEOUT_CODE)
+  const id = await shells.get(owner, commandDeadline.signal)
+  const marker = markers()
+  const wrapped = wrapCommand(command, marker)
+  let first = true
+  let fallback = ''
+  let fallbackTruncated = false
+
+  while (true) {
+    let operation
+    let result
+    try {
+      operation = ctx.pty.startSend(owner, id, {
+        text: first ? wrapped : '',
+        submit: first,
+        signal: commandDeadline.signal,
+      })
+      first = false
+      result = await operation.done
+    } catch (error: unknown) {
+      await shells.reset(owner, 'persistent bash send failed')
+      throw error
+    }
+    const incremental = operation.readOutput()
+    fallback = incremental.delta.length > 0 ? fallback + incremental.delta : result.viewport
+    fallbackTruncated ||= incremental.truncated || result.truncated
+    const latest = ctx.pty.read(owner, id, { offset: 0, count: SCROLLBACK_PAGE_LINES })
+    const timedOut = timeoutOf(commandDeadline.signal, TIMEOUT_CODE)
+    if (timedOut !== undefined) {
+      const snapshot = retainedScrollback(ctx, owner, id, latest)
+      const partial = renderCaptured(
+        partialOutput(snapshot, marker, fallback, fallbackTruncated),
+        config.maxOutputChars,
+      )
+      await shells.reset(owner, 'persistent bash command timed out')
+      return [
+        // TODO: Report a timeout only; this signal does not establish an OOM.
+        `Your command timed out after ${Math.round(timedOut.timeoutMs / 1000)} seconds or experienced an OOM error. Below is partial output:`,
+        partial,
+        SHELL_RESET_MESSAGE,
+      ].join('\n')
+    }
+    if (commandDeadline.signal.aborted) {
+      await shells.reset(owner, 'persistent bash command aborted')
+      commandDeadline.signal.throwIfAborted()
+    }
+    if (latest.text.includes(marker.end)) {
+      const complete = commandOutput(retainedScrollback(ctx, owner, id, latest), marker)
+      if (complete !== undefined) return renderCaptured(complete, config.maxOutputChars)
+    }
+    if (result.sessionStatus.kind === 'exited') {
+      const snapshot = retainedScrollback(ctx, owner, id, latest)
+      await shells.reset(owner, 'persistent bash shell exited')
+      return [
+        renderShellExitStatus(
+          renderCaptured(partialOutput(snapshot, marker, fallback, fallbackTruncated), config.maxOutputChars),
+          result.sessionStatus.exitCode,
+          result.sessionStatus.signal,
+        ),
+        SHELL_RESET_MESSAGE,
+      ].filter(part => part.length > 0).join('\n')
+    }
+    if (promptCompleted(result)) {
+      const snapshot = retainedScrollback(ctx, owner, id, latest)
+      return renderCaptured(
+        partialOutput(snapshot, marker, fallback, fallbackTruncated),
+        config.maxOutputChars,
+      )
+    }
+    await pause()
+  }
+}
+
+/**
+ * Register the model-facing persistent `bash` tool.
+ * @param ctx - plugin context carrying tools and the owner-scoped PTY service.
+ * @param config - selected PTY backend and command deadline.
+ */
+function registerPersistentBash(ctx: Context, config: ResolvedConfig): void {
+  const shells = persistentShells(ctx, config)
+  const queues = new WeakMap<Agent, Promise<void>>()
+
+  const serialized = async <T>(owner: Agent, operation: () => Promise<T>): Promise<T> => {
+    const prior = queues.get(owner) ?? Promise.resolve()
+    const run = prior.then(operation, operation)
+    const tail = run.then(() => undefined, () => undefined)
+    queues.set(owner, tail)
+    try {
+      return await run
+    } finally {
+      if (queues.get(owner) === tail) queues.delete(owner)
+    }
+  }
+
+  ctx.tools.register(defineTool({
+    name: 'bash',
+    description: config.description,
+    parameters: {
+      command: {
+        type: 'string',
+        required: true,
+        description: 'The bash command to run. Relative path is preferred in the command.',
+      },
+    },
+    output: {
+      schema: { type: 'string' },
+      render: (_args, value) => [{ type: 'text', text: value }],
+    },
+    async execute(args, exec) {
+      if (args.command.trim().length === 0) throw new Error('command must be a non-empty string')
+      const owner = exec.agent
+      if (owner === undefined) throw new Error('bash requires an owning agent session')
+      return serialized(owner, async () => {
+        exec.signal.throwIfAborted()
+        return executeCommand(ctx, shells, owner, args.command, config, exec.signal)
+      })
+    },
+    presentCall: args => ({ card: 'terminal', title: args.command }),
+  }))
+}
+
+export const name = 'tool-bash-persistent'
+export const inject = ['tools', 'pty']
+
+/** Configuration for the persistent Bash tool. */
+export interface Config {
+  /** PTY backend used for each owner-isolated persistent shell (default `shell`). */
+  backendType?: string
+  /** Wall-clock limit for one command (default 300000). */
+  timeoutMs?: number
+  /** Maximum returned command-output characters before clipping (default 16000). */
+  maxOutputChars?: number
+  /** Model-facing tool description; deployments may describe their environment. */
+  description?: string
+}
+
+/** Runtime configuration schema for the persistent Bash tool. */
+export const Config: z<Config> = z.object({
+  backendType: z.string().default('shell'),
+  timeoutMs: z.number().default(300_000),
+  maxOutputChars: z.number().default(16_000),
+  description: z.string().default(DEFAULT_DESCRIPTION),
+})
+
+/** Register one owner-scoped persistent `bash` tool. */
+export function apply(ctx: Context, config: Config): void {
+  const resolved: ResolvedConfig = {
+    backendType: config.backendType ?? 'shell',
+    timeoutMs: config.timeoutMs ?? 300_000,
+    maxOutputChars: config.maxOutputChars ?? 16_000,
+    description: config.description ?? DEFAULT_DESCRIPTION,
+  }
+  if (resolved.backendType.trim().length === 0) {
+    throw new Error('tool-bash-persistent: backendType must be non-empty')
+  }
+  if (!Number.isSafeInteger(resolved.timeoutMs) || resolved.timeoutMs <= 0) {
+    throw new Error('tool-bash-persistent: timeoutMs must be a positive safe integer')
+  }
+  if (!Number.isSafeInteger(resolved.maxOutputChars) || resolved.maxOutputChars <= 0) {
+    throw new Error('tool-bash-persistent: maxOutputChars must be a positive safe integer')
+  }
+  if (resolved.description.trim().length === 0) {
+    throw new Error('tool-bash-persistent: description must be non-empty')
+  }
+  registerPersistentBash(ctx, resolved)
+}

packages/pty/tool-bash-persistent/src/invariant.ts

@@ -0,0 +1,31 @@
+/**
+ * Package-owned invariant companion for `@deepseek-ai/dsh-tool-bash-persistent`.
+ * @module @deepseek-ai/dsh-tool-bash-persistent/invariant
+ */
+
+/* jscpd:ignore-start */
+import type { Context } from 'cordis'
+import type { InvariantInstaller } from '@deepseek-ai/dsh-invariants'
+
+const PACKAGE_NAME = '@deepseek-ai/dsh-tool-bash-persistent'
+
+/** Cordis companion plugin name. */
+export const name = 'tool-bash-persistent-invariant'
+/** Service required before the companion can reserve package ownership. */
+export const inject = ['invariants']
+
+/**
+ * No runtime invariant: the adapter's private owner-to-shell cache has no
+ * observable event or data relation. Lifecycle tests prove its cleanup without
+ * adding a public surface solely for an invariant.
+ */
+const install: InvariantInstaller = () => {}
+
+/**
+ * Register this package's invariant companion.
+ * @param ctx - Cordis context carrying the invariant service.
+ * @returns the installed registration's disposer after setup succeeds.
+ */
+export const apply = (ctx: Context): Promise<() => void> =>
+  Promise.resolve(ctx.invariants.register(PACKAGE_NAME, install))
+/* jscpd:ignore-end */

packages/pty/tool-bash-persistent/tests/loader-composition.spec.ts

@@ -0,0 +1,157 @@
+import { mkdtemp, rm, writeFile } from 'node:fs/promises'
+import { tmpdir } from 'node:os'
+import { join } from 'node:path'
+import { pathToFileURL } from 'node:url'
+import { afterEach, describe, expect, it } from 'vitest'
+import { Context } from 'cordis'
+import Loader from '@cordisjs/plugin-loader'
+import Include from '@cordisjs/plugin-include'
+import { CallId } from '@deepseek-ai/dsh-llm'
+import { Session, SessionId } from '@deepseek-ai/dsh-session'
+import AgentRegistry from '@deepseek-ai/dsh-agent'
+import type { Agent } from '@deepseek-ai/dsh-agent'
+import PtyService from '@deepseek-ai/dsh-pty'
+import * as PtyLocal from '@deepseek-ai/dsh-pty-local'
+import SandboxProvider from '@deepseek-ai/dsh-sandbox'
+import type { ConfinedArgv, SandboxPolicy } from '@deepseek-ai/dsh-sandbox'
+import SandboxPolicyService from '@deepseek-ai/dsh-sandbox-policy'
+import SystemPrompt from '@deepseek-ai/dsh-system-prompt'
+import ToolRegistry from '@deepseek-ai/dsh-tools'
+import * as ToolBashPersistent from '@deepseek-ai/dsh-tool-bash-persistent'
+
+let root: string | undefined
+let context: Context | undefined
+
+afterEach(async () => {
+  await context?.fiber.dispose()
+  context = undefined
+  if (root !== undefined) await rm(root, { recursive: true, force: true })
+  root = undefined
+})
+
+class PassthroughSandbox extends SandboxProvider {
+  confine(argv: readonly string[], _policy: SandboxPolicy): ConfinedArgv {
+    return { argv: [...argv], enforcement: 'full', denialSignatures: [], runnerFailureSignatures: [] }
+  }
+}
+
+function agent(ctx: Context, cwd: string): Agent {
+  const id = SessionId('persistent-bash-loader-agent')
+  const scope = ctx.plugin(() => {})
+  const value: Agent = {
+    id,
+    options: {},
+    session: new Session(id, [], { version: 0, id, createdAt: 0, cwd }),
+    status: 'idle',
+    acceptsNextStep: false,
+    ctx: scope.ctx,
+    followup: () => {},
+    steer: () => {},
+    inject: () => {},
+    send: () => {},
+    updateInbox: () => 'not-found',
+    cancel() {},
+    whenIdle: () => Promise.resolve(),
+  }
+  ctx.agents.register(value)
+  return value
+}
+
+function text(result: { content: { type: string; text?: string }[] }): string {
+  return result.content.filter(block => block.type === 'text').map(block => block.text).join('')
+}
+
+const suite = process.platform === 'linux' || process.platform === 'darwin' ? describe : describe.skip
+
+suite('persistent Bash through a real cordis.yml Loader composition', () => {
+  it('preserves cwd and environment across calls', async () => {
+    root = await mkdtemp(join(tmpdir(), 'dsh-persistent-bash-loader-'))
+    const configPath = join(root, 'cordis.yml')
+    await writeFile(configPath, [
+      "- name: '@deepseek-ai/dsh-agent'",
+      "- name: '@deepseek-ai/dsh-system-prompt'",
+      "- name: '@deepseek-ai/dsh-tools'",
+      "- name: '@deepseek-ai/dsh-pty'",
+      "- name: '@deepseek-ai/dsh-test-sandbox'",
+      "- name: '@deepseek-ai/dsh-sandbox-policy'",
+      '  config:',
+      '    mode: danger-full-access',
+      `    workspaceRoot: ${JSON.stringify(root)}`,
+      "- name: '@deepseek-ai/dsh-pty-local'",
+      '  config:',
+      '    pollIntervalMs: 10',
+      '    exactProbeAfterMs: 20',
+      '    idleSilenceMs: 100',
+      '    handoffGraceMs: 100',
+      '    scrollbackLines: 20000',
+      '    timeoutMs: 2000',
+      '    disposeGraceMs: 500',
+      "- name: '@deepseek-ai/dsh-tool-bash-persistent'",
+      '  config:',
+      '    timeoutMs: 5000',
+      '',
+    ].join('\n'))
+
+    context = new Context()
+    context.baseUrl = pathToFileURL(root).href + '/'
+    await context.plugin(Loader)
+    context.loader.builtins.include = Include
+    const modules = new Map<string, unknown>([
+      ['@deepseek-ai/dsh-agent', AgentRegistry],
+      ['@deepseek-ai/dsh-system-prompt', SystemPrompt],
+      ['@deepseek-ai/dsh-tools', ToolRegistry],
+      ['@deepseek-ai/dsh-pty', PtyService],
+      ['@deepseek-ai/dsh-test-sandbox', PassthroughSandbox],
+      ['@deepseek-ai/dsh-sandbox-policy', SandboxPolicyService],
+      ['@deepseek-ai/dsh-pty-local', PtyLocal],
+      ['@deepseek-ai/dsh-tool-bash-persistent', ToolBashPersistent],
+    ])
+    context.loader.internal = {
+      version: 'v2',
+      async import(specifier: string) {
+        if (!modules.has(specifier)) throw new Error(`unexpected Loader import: ${specifier}`)
+        return modules.get(specifier)
+      },
+    } as unknown as NonNullable<typeof context.loader.internal>
+    await context.loader.create({ name: 'cordis:include', config: { path: pathToFileURL(configPath).href } })
+    await context.loader.await()
+
+    const owner = agent(context, root)
+    const signal = new AbortController().signal
+    const execute = (id: string, command: string) => context!.tools.execute({
+      signal,
+      callId: CallId(id),
+      name: 'bash',
+      arguments: { command },
+      agent: owner,
+    })
+
+    expect(context.tools.schemas().map(schema => schema.name)).toEqual(['bash'])
+    await execute('state', 'export KEEP=loader; mkdir -p nested; cd nested')
+    const observed = text(await execute('observe', 'printf "cwd=%s keep=%s\\n" "$PWD" "$KEEP"'))
+    expect(observed).toContain(`cwd=${join(root, 'nested')} keep=loader`)
+    expect(observed).not.toContain('DSH_PERSISTENT_BASH')
+
+    const multiline = text(await execute(
+      'multiline',
+      'value="line one"\nprintf "%s:%s\\n" "$value" "it\'s fine"',
+    ))
+    expect(multiline).toBe("line one:it's fine")
+    expect(multiline).not.toContain('DSH_PERSISTENT_BASH')
+
+    const heredoc = text(await execute(
+      'heredoc',
+      "cat <<'EOF'\nalpha\nbeta\nEOF",
+    ))
+    expect(heredoc).toBe('alpha\nbeta')
+
+    const large = text(await execute('large-output', 'seq 1 12050'))
+    expect(large.startsWith('1\n2\n3\n')).toBe(true)
+    expect(large).toContain('<response clipped>')
+    expect(large).not.toContain('beginning of this command output was dropped')
+
+    const exited = text(await execute('exit', 'exit'))
+    expect(exited).toContain('next bash call starts from the workspace')
+    expect(text(await execute('after-exit', 'printf "%s\\n" "$PWD"'))).toBe(root)
+  }, 20_000)
+})

packages/pty/tool-bash-persistent/tests/tools.spec.ts

@@ -0,0 +1,538 @@
+import { afterEach, describe, expect, it } from 'vitest'
+import { Context } from 'cordis'
+import { CallId } from '@deepseek-ai/dsh-llm'
+import { Session, SessionId } from '@deepseek-ai/dsh-session'
+import AgentRegistry from '@deepseek-ai/dsh-agent'
+import type { Agent } from '@deepseek-ai/dsh-agent'
+import PtyService from '@deepseek-ai/dsh-pty'
+import type {
+  PtyBackend,
+  PtyBackendSession,
+  PtyReadRequest,
+  PtySendOperation,
+  PtySendRequest,
+  PtySessionStatus,
+  PtySignal,
+  PtyWaitReason,
+} from '@deepseek-ai/dsh-pty'
+import SystemPrompt from '@deepseek-ai/dsh-system-prompt'
+import ToolRegistry from '@deepseek-ai/dsh-tools'
+import * as ToolBashPersistent from '@deepseek-ai/dsh-tool-bash-persistent'
+
+const contexts: Context[] = []
+let callNumber = 0
+
+afterEach(async () => {
+  for (const ctx of contexts.splice(0)) await ctx.fiber.dispose()
+})
+
+function agent(ctx: Context, cwd: string | undefined): Agent {
+  const id = SessionId(`persistent-bash-owner-${callNumber}`)
+  const scope = ctx.plugin(() => {})
+  const value: Agent = {
+    id,
+    options: {},
+    session: new Session(id, [], {
+      version: 0,
+      id,
+      createdAt: 0,
+      ...cwd === undefined ? {} : { cwd },
+    }),
+    status: 'idle',
+    acceptsNextStep: false,
+    ctx: scope.ctx,
+    followup: () => {},
+    steer: () => {},
+    inject: () => {},
+    send: () => {},
+    updateInbox: () => 'not-found',
+    cancel() {},
+    whenIdle: () => Promise.resolve(),
+  }
+  ctx.agents.register(value)
+  return value
+}
+
+function text(result: { content: { type: string; text?: string }[] }): string {
+  return result.content.filter(block => block.type === 'text').map(block => block.text).join('')
+}
+
+function call(
+  ctx: Context,
+  owner: Agent | undefined,
+  command: string,
+  signal = new AbortController().signal,
+) {
+  return ctx.tools.execute({
+    signal,
+    callId: CallId(`persistent-bash-${++callNumber}`),
+    name: 'bash',
+    arguments: { command },
+    ...owner === undefined ? {} : { agent: owner },
+  })
+}
+
+type StubMode =
+  | 'normal'
+  | 'prompt-only'
+  | 'prompt-crlf'
+  | 'empty-read'
+  | 'stalled-read'
+  | 'exit'
+  | 'signal-exit'
+  | 'unknown-exit'
+  | 'wait-for-abort'
+  | 'end-on-abort'
+  | 'idle-then-normal'
+  | 'large'
+  | 'nonzero'
+  | 'torn-status'
+  | 'finish-torn-status'
+  | 'end-only'
+  | 'init-exit'
+  | 'init-timeout'
+  | 'spawn-error'
+  | 'send-error'
+  | 'prompt-after-idle'
+  | 'empty-page-after-latest'
+
+class StubPtySession implements PtyBackendSession {
+  readonly motd = '__DSH_PERSISTENT_BASH_PROMPT__ '
+  readonly pid = 123
+  statusValue: PtySessionStatus = { kind: 'running' }
+  scrollback = this.motd
+  closed: string[] = []
+  mode: StubMode
+  sends = 0
+  pendingText = ''
+  historyTruncated = false
+
+  constructor(mode: StubMode) {
+    this.mode = mode
+  }
+
+  startSend(request: PtySendRequest): PtySendOperation {
+    this.sends += 1
+    if (request.text.startsWith('stty -echo')) {
+      if (this.mode === 'init-exit') {
+        this.statusValue = { kind: 'exited', exitCode: 1, signal: null }
+        return this.operation(Promise.resolve(this.result('', 'session_exit')))
+      }
+      if (this.mode === 'init-timeout') {
+        return this.operation(Promise.resolve(this.result('', 'timeout')))
+      }
+      return this.operation(Promise.resolve(this.result(this.motd, 'stdin_read')))
+    }
+    if (this.mode === 'send-error') throw new Error('stub send failed')
+    if (this.mode === 'wait-for-abort' || this.mode === 'end-on-abort') {
+      const done = new Promise<ReturnType<StubPtySession['result']>>((resolve) => {
+        request.signal?.addEventListener('abort', () => {
+          const start = /__DSH_PERSISTENT_BASH_START_[^_]+(?:-[^_]+)*__/.exec(request.text)?.[0]
+          const end = /__DSH_PERSISTENT_BASH_END_[^:]+:/.exec(request.text)?.[0]
+          const output = this.mode === 'end-on-abort'
+            ? `${start ?? ''}\ninterrupted\n${end ?? ''}130\n${this.motd}`
+            : 'partial output'
+          this.scrollback += output
+          resolve(this.result(output, 'stdin_read'))
+        }, { once: true })
+      })
+      return this.operation(done)
+    }
+    if (this.mode === 'idle-then-normal') {
+      this.mode = 'normal'
+      this.pendingText = request.text
+      return this.operation(Promise.resolve(this.result('', 'inferred_idle')))
+    }
+    if (this.mode === 'prompt-after-idle') {
+      if (request.text.length > 0) {
+        const start = /__DSH_PERSISTENT_BASH_START_[^_]+(?:-[^_]+)*__/.exec(request.text)?.[0]
+        const output = `${start ?? ''}\npartial syntax output\n`
+        this.scrollback += output
+        return this.operation(Promise.resolve(this.result(output, 'inferred_idle')))
+      }
+      const output = `bash: syntax error\n${this.motd}`
+      this.scrollback += output
+      return this.operation(Promise.resolve(this.result(output, 'stdin_read')))
+    }
+    if (this.mode === 'prompt-only' || this.mode === 'prompt-crlf') {
+      const newline = this.mode === 'prompt-crlf' ? '\r\n' : '\n'
+      const output = `bash: syntax error${newline}${this.motd}${newline}`
+      this.scrollback += output
+      return this.operation(Promise.resolve(this.result(output, 'stdin_read')))
+    }
+    const sent = request.text.length > 0 ? request.text : this.pendingText
+    this.pendingText = ''
+    const start = /__DSH_PERSISTENT_BASH_START_[^_]+(?:-[^_]+)*__/.exec(sent)?.[0]
+    const end = /__DSH_PERSISTENT_BASH_END_[^:]+:/.exec(sent)?.[0]
+    if (this.mode === 'torn-status') {
+      const output = `${start ?? ''}\nhello from stub\n${end ?? ''}`
+      this.scrollback += output
+      this.mode = 'finish-torn-status'
+      return this.operation(Promise.resolve(this.result(output, 'inferred_idle')))
+    }
+    if (this.mode === 'finish-torn-status') {
+      const output = `7\n${this.motd}`
+      this.scrollback += output
+      return this.operation(Promise.resolve(this.result(output, 'stdin_read')))
+    }
+    if (this.mode === 'end-only') {
+      const output = `recovered output\n${end ?? ''}0\n${this.motd}`
+      this.scrollback += output
+      return this.operation(Promise.resolve(this.result(output, 'stdin_read')))
+    }
+    const commandOutput = this.mode === 'large'
+      ? 'x'.repeat(100)
+      : this.mode === 'nonzero' ? '' : 'hello from stub'
+    const exitCode = this.mode === 'nonzero' ? 7 : 0
+    const output = `${start ?? ''}\n${commandOutput}\n${end ?? ''}${exitCode}\n${this.motd}`
+    this.scrollback += output
+    if (this.mode === 'exit' || this.mode === 'signal-exit' || this.mode === 'unknown-exit') {
+      const exitedOutput = `${start ?? ''}\nhello from stub\n`
+      this.scrollback = this.scrollback.slice(0, -output.length) + exitedOutput
+      this.statusValue = this.mode === 'signal-exit'
+        ? { kind: 'exited', exitCode: null, signal: 'SIGTERM' }
+        : this.mode === 'exit'
+          ? { kind: 'exited', exitCode: 9, signal: null }
+          : { kind: 'exited', exitCode: null, signal: null }
+      return this.operation(Promise.resolve(this.result(exitedOutput, 'session_exit')))
+    }
+    return this.operation(Promise.resolve(this.result(output, 'stdin_read')))
+  }
+
+  read(request: PtyReadRequest) {
+    if (this.mode === 'empty-read') {
+      return { text: '', totalLines: 0, lineBegin: 0, lineEnd: 0, truncated: false }
+    }
+    if (this.mode === 'stalled-read') {
+      return { text: 'stalled', totalLines: 1, lineBegin: 0, lineEnd: 0, truncated: false }
+    }
+    if (this.mode === 'empty-page-after-latest' && (request.offset ?? 0) > 0) {
+      return { text: '', totalLines: 2, lineBegin: 1, lineEnd: 1, truncated: false }
+    }
+    const lines = this.scrollback.split('\n')
+    return {
+      text: this.scrollback,
+      totalLines: this.mode === 'empty-page-after-latest' ? lines.length + 1 : lines.length,
+      lineBegin: 0,
+      lineEnd: this.mode === 'empty-page-after-latest' ? 1 : lines.length,
+      truncated: this.historyTruncated,
+    }
+  }
+
+  signal(_signal: PtySignal) {
+    return Promise.resolve({ delivered: true as const, targetPgid: 123 })
+  }
+
+  status() {
+    return this.statusValue
+  }
+
+  async close(reason: string) {
+    this.closed.push(reason)
+    this.statusValue = { kind: 'exited', exitCode: 0, signal: null }
+  }
+
+  private result(viewport: string, waitReason: PtyWaitReason) {
+    return { viewport, waitReason, sessionStatus: this.statusValue, truncated: false }
+  }
+
+  private operation(done: Promise<ReturnType<StubPtySession['result']>>): PtySendOperation {
+    return {
+      done,
+      readOutput: () => ({ delta: '', truncated: false }),
+      cancel: () => false,
+    }
+  }
+}
+
+function stubBackend(initialMode: StubMode = 'normal') {
+  const sessions: StubPtySession[] = []
+  const backend: PtyBackend = {
+    type: 'stub',
+    async spawn() {
+      if (initialMode === 'spawn-error') throw new Error('stub spawn failed')
+      const session = new StubPtySession(initialMode)
+      sessions.push(session)
+      return session
+    },
+  }
+  return { backend, sessions }
+}
+
+async function setup(
+  config: ToolBashPersistent.Config = { backendType: 'stub' },
+  initialMode: StubMode = 'normal',
+) {
+  const ctx = new Context()
+  contexts.push(ctx)
+  await ctx.plugin(SystemPrompt)
+  await ctx.plugin(ToolRegistry)
+  await ctx.plugin(AgentRegistry)
+  await ctx.plugin(PtyService)
+  const stub = stubBackend(initialMode)
+  ctx.pty.registerBackend(stub.backend)
+  const fiber = await ctx.plugin(ToolBashPersistent, config)
+  return { ctx, stub, fiber, owner: agent(ctx, '/workspace') }
+}
+
+describe('tool-bash-persistent', () => {
+  it('registers a configurable schema and reuses one owner shell', async () => {
+    const { ctx, owner, stub, fiber } = await setup({
+      backendType: 'stub',
+      description: 'deployment-specific persistent shell',
+    })
+    const schema = ctx.tools.schemas()[0]
+    expect(ctx.tools.schemas().map(item => item.name)).toEqual(['bash'])
+    expect(schema?.description).toBe('deployment-specific persistent shell')
+    expect(schema?.parameters).toMatchObject({
+      required: ['command'],
+      properties: { command: { type: 'string' } },
+    })
+    expect(ctx.tools.get('bash')?.presentCall?.({ command: 'pwd' }))
+      .toEqual({ card: 'terminal', title: 'pwd' })
+
+    expect(text(await call(ctx, owner, 'echo one'))).toBe('hello from stub')
+    expect(text(await call(ctx, owner, 'echo two'))).toBe('hello from stub')
+    expect(stub.sessions).toHaveLength(1)
+    expect(stub.sessions[0]?.sends).toBe(3)
+
+    const ownerWithoutCwd = agent(ctx, undefined)
+    expect(text(await call(ctx, ownerWithoutCwd, 'pwd'))).toBe('hello from stub')
+    expect(stub.sessions).toHaveLength(2)
+
+    await fiber.dispose()
+    expect(ctx.tools.schemas()).toEqual([])
+    expect(ctx.tools.get('bash')).toBeUndefined()
+  })
+
+  it('handles inferred idle, prompt fallback, shell exit, clipping, and cleanup', async () => {
+    const { ctx, owner, stub, fiber } = await setup({
+      backendType: 'stub',
+      maxOutputChars: 10,
+    })
+    await call(ctx, owner, 'warm up')
+    const session = stub.sessions[0]!
+
+    session.mode = 'idle-then-normal'
+    expect(text(await call(ctx, owner, 'silent then complete'))).toContain('hello from')
+
+    session.mode = 'prompt-only'
+    const promptFallback = text(await call(ctx, owner, 'bad {'))
+    expect(promptFallback).toContain('bash: synt')
+    expect(promptFallback).not.toContain('DSH_PERSISTENT_BASH_PROMPT')
+
+    session.mode = 'prompt-crlf'
+    session.scrollback = ''
+    const crlfPromptFallback = text(await call(ctx, owner, 'bad {'))
+    expect(crlfPromptFallback).toContain('bash: synt')
+    expect(crlfPromptFallback).not.toContain('DSH_PERSISTENT_BASH_PROMPT')
+
+    session.mode = 'end-only'
+    session.scrollback = ''
+    const missingStart = text(await call(ctx, owner, 'recover marker'))
+    expect(missingStart).toContain('recovered')
+    expect(missingStart).toContain('beginning of this command output was dropped')
+    expect(missingStart).toContain('<response clipped>')
+
+    session.mode = 'large'
+    expect(text(await call(ctx, owner, 'large'))).toContain('<response clipped>')
+
+    session.mode = 'nonzero'
+    expect(text(await call(ctx, owner, 'false'))).toBe('[exit code: 7]')
+
+    session.mode = 'exit'
+    const exited = text(await call(ctx, owner, 'exit'))
+    expect(exited).toContain('hello from')
+    expect(exited).toContain('[shell exited: code 9]')
+    expect(exited).not.toContain('[exit code: 9]')
+    expect(exited).toContain('next bash call starts from the workspace')
+    expect(session.closed).toContain('persistent bash shell exited')
+
+    await call(ctx, owner, 'new shell')
+    expect(stub.sessions).toHaveLength(2)
+    const replacement = stub.sessions[1]!
+    replacement.mode = 'signal-exit'
+    expect(text(await call(ctx, owner, 'kill shell')))
+      .toContain('[shell killed by signal: SIGTERM]')
+
+    await call(ctx, owner, 'another shell')
+    expect(stub.sessions).toHaveLength(3)
+    const externallyClosed = ctx.pty.list(owner)[0]?.sessionId
+    expect(externallyClosed).toBeDefined()
+    await ctx.pty.kill(owner, externallyClosed!, 'external cleanup')
+    await fiber.dispose()
+    expect(stub.sessions[2]?.closed).toEqual(['external cleanup'])
+  })
+
+  it('waits for status digits after a torn completion marker', async () => {
+    const { ctx, owner, stub } = await setup({ backendType: 'stub', maxOutputChars: 1_000 })
+    await call(ctx, owner, 'warm up')
+    stub.sessions[0]!.mode = 'torn-status'
+    stub.sessions[0]!.scrollback = ''
+
+    expect(text(await call(ctx, owner, 'torn status'))).toBe('hello from stub\n[exit code: 7]')
+  })
+
+  it('reports a shell exit when the backend has no code or signal', async () => {
+    const { ctx, owner, stub } = await setup({ backendType: 'stub' })
+    await call(ctx, owner, 'warm up')
+    stub.sessions[0]!.mode = 'unknown-exit'
+
+    expect(text(await call(ctx, owner, 'exit without status'))).toContain('[shell exited]')
+  })
+
+  it('marks a short missing-prefix result and tolerates exhausted scrollback pages', async () => {
+    const { ctx, owner, stub } = await setup({ backendType: 'stub', maxOutputChars: 1_000 })
+    await call(ctx, owner, 'warm up')
+    const session = stub.sessions[0]!
+
+    session.mode = 'end-only'
+    session.scrollback = ''
+    expect(text(await call(ctx, owner, 'missing start')))
+      .toContain('beginning of this command output was dropped')
+
+    session.mode = 'empty-read'
+    expect(text(await call(ctx, owner, 'empty page'))).toContain('hello from stub')
+
+    session.mode = 'stalled-read'
+    expect(text(await call(ctx, owner, 'stalled page'))).toContain('hello from stub')
+
+    session.mode = 'empty-page-after-latest'
+    expect(text(await call(ctx, owner, 'empty continuation page'))).toContain('hello from stub')
+  })
+
+  it('sanitizes a prompt fallback reached after multiple polling rounds', async () => {
+    const { ctx, owner, stub } = await setup({ backendType: 'stub', maxOutputChars: 1_000 })
+    await call(ctx, owner, 'warm up')
+    const session = stub.sessions[0]!
+    session.mode = 'prompt-after-idle'
+    session.scrollback = ''
+    const result = text(await call(ctx, owner, 'bad {'))
+    expect(result).toContain('partial syntax output')
+    expect(result).toContain('bash: syntax error')
+    expect(result).not.toContain('DSH_PERSISTENT_BASH_PROMPT')
+    expect(result).not.toContain('DSH_PERSISTENT_BASH_START')
+  })
+
+  it('does not attribute old scrollback truncation to a complete current command', async () => {
+    const { ctx, owner, stub } = await setup({ backendType: 'stub', maxOutputChars: 1_000 })
+    await call(ctx, owner, 'warm up')
+    stub.sessions[0]!.historyTruncated = true
+    const result = text(await call(ctx, owner, 'short command'))
+    expect(result).toBe('hello from stub')
+    expect(result).not.toContain('<response clipped>')
+    expect(result).not.toContain('beginning of this command output was dropped')
+  })
+
+  it('closes a timed-out shell and reports bounded partial output', async () => {
+    const { ctx, owner, stub } = await setup({ backendType: 'stub', timeoutMs: 10 })
+    await call(ctx, owner, 'warm up')
+    stub.sessions[0]!.mode = 'wait-for-abort'
+    const result = await call(ctx, owner, 'hang')
+    expect(text(result)).toContain('timed out after 0 seconds or experienced an OOM error')
+    expect(text(result)).toContain('partial output')
+    expect(text(result)).toContain('next bash call starts from the workspace')
+    expect(stub.sessions[0]?.closed).toContain('persistent bash command timed out')
+  })
+
+  it.each(['wait-for-abort', 'end-on-abort'] as const)(
+    'cancels %s work, resets the shell, and releases a queued call',
+    async (mode) => {
+      const { ctx, owner, stub } = await setup({ backendType: 'stub', timeoutMs: 5_000 })
+      await call(ctx, owner, 'warm up')
+      stub.sessions[0]!.mode = mode
+      const controller = new AbortController()
+      const cancelled = call(ctx, owner, 'hang', controller.signal)
+      const queued = call(ctx, owner, 'after cancellation')
+      setTimeout(() => {
+        controller.abort(new Error('caller stopped'))
+      }, 5)
+
+      expect((await cancelled).isError).toBe(true)
+      expect(text(await queued)).toBe('hello from stub')
+      expect(stub.sessions[0]?.closed).toContain('persistent bash command aborted')
+      expect(stub.sessions).toHaveLength(2)
+    },
+  )
+
+  it.each(['init-exit', 'init-timeout'] as const)(
+    'fails initialization and closes the unusable shell for %s',
+    async (mode) => {
+      const { ctx, owner, stub } = await setup({ backendType: 'stub' }, mode)
+      expect((await call(ctx, owner, 'pwd')).isError).toBe(true)
+      expect(stub.sessions[0]?.closed).toContain('persistent bash initialization failed')
+    },
+  )
+
+  it('clears a failed spawn without trying to close an unpublished shell', async () => {
+    const { ctx, owner, stub } = await setup({ backendType: 'stub' }, 'spawn-error')
+    expect((await call(ctx, owner, 'pwd')).isError).toBe(true)
+    expect(stub.sessions).toHaveLength(0)
+  })
+
+  it('resets a cached shell after startSend fails', async () => {
+    const { ctx, owner, stub } = await setup()
+    await call(ctx, owner, 'warm up')
+    stub.sessions[0]!.mode = 'send-error'
+    expect((await call(ctx, owner, 'fails')).isError).toBe(true)
+    expect(stub.sessions[0]?.closed).toContain('persistent bash send failed')
+    expect(text(await call(ctx, owner, 'recovers'))).toBe('hello from stub')
+    expect(stub.sessions).toHaveLength(2)
+  })
+
+  it('cancels and awaits a pending shell spawn when the plugin is disposed', async () => {
+    const ctx = new Context()
+    contexts.push(ctx)
+    await ctx.plugin(SystemPrompt)
+    await ctx.plugin(ToolRegistry)
+    await ctx.plugin(AgentRegistry)
+    await ctx.plugin(PtyService)
+    const spawnStarted = Promise.withResolvers<undefined>()
+    const spawnAborted = Promise.withResolvers<undefined>()
+    ctx.pty.registerBackend({
+      type: 'slow',
+      spawn: spec => new Promise((_resolve, reject) => {
+        spawnStarted.resolve(undefined)
+        spec.signal?.addEventListener('abort', () => {
+          spawnAborted.resolve(undefined)
+          const reason: unknown = spec.signal?.reason
+          reject(reason instanceof Error
+            ? reason
+            : new Error('slow PTY spawn aborted', { cause: reason }))
+        }, { once: true })
+      }),
+    })
+    const fiber = await ctx.plugin(ToolBashPersistent, { backendType: 'slow' })
+    const owner = agent(ctx, '/workspace')
+    const running = call(ctx, owner, 'pwd')
+    await spawnStarted.promise
+    await fiber.dispose()
+    await spawnAborted.promise
+    expect((await running).isError).toBe(true)
+    expect(ctx.pty.list(owner)).toEqual([])
+  })
+
+  it('rejects invalid config and invalid calls', async () => {
+    const { ctx, owner, stub } = await setup()
+    expect((await call(ctx, undefined, 'pwd')).isError).toBe(true)
+    expect(text(await call(ctx, owner, ' '))).toContain('command must be a non-empty string')
+
+    const controller = new AbortController()
+    controller.abort(new Error('caller stopped'))
+    expect((await call(ctx, owner, 'pwd', controller.signal)).isError).toBe(true)
+    expect(stub.sessions).toHaveLength(0)
+
+    expect(() => {
+      ToolBashPersistent.apply(new Context(), { backendType: '' })
+    }).toThrow('backendType must be non-empty')
+    expect(() => {
+      ToolBashPersistent.apply(new Context(), { timeoutMs: 0 })
+    }).toThrow('timeoutMs must be a positive safe integer')
+    expect(() => {
+      ToolBashPersistent.apply(new Context(), { maxOutputChars: 0 })
+    }).toThrow('maxOutputChars must be a positive safe integer')
+    expect(() => {
+      ToolBashPersistent.apply(new Context(), { description: ' ' })
+    }).toThrow('description must be non-empty')
+  })
+})

packages/pty/tool-bash-persistent/tsconfig.json

@@ -0,0 +1,16 @@
+{
+  "extends": "../../../tsconfig.base.json",
+  "compilerOptions": {
+    "rootDir": "src",
+    "outDir": "lib/types"
+  },
+  "include": ["src"],
+  "references": [
+    { "path": "../../../vendor/cordis" },
+    { "path": "../../core/agent" },
+    { "path": "../../core/tools" },
+    { "path": "../pty" },
+    { "path": "../../support/invariants" },
+    { "path": "../../util/timeout" }
+  ]
+}

patches/node-pty@1.1.0.patch

@@ -0,0 +1,62 @@
+diff --git a/lib/unixTerminal.js b/lib/unixTerminal.js
+index 1ec12f796a822c78fba9ad7f6448c3987e325c23..5cd6b7d635f4752be5a6c5ff9cf9edf988cf94c5 100644
+--- a/lib/unixTerminal.js
++++ b/lib/unixTerminal.js
+@@ -26,10 +26,23 @@ var terminal_1 = require("./terminal");
+ var utils_1 = require("./utils");
+ var native = utils_1.loadNativeModule('pty');
+ var pty = native.module;
+-var helperPath = native.dir + '/spawn-helper';
+-helperPath = path.resolve(__dirname, helperPath);
+-helperPath = helperPath.replace('app.asar', 'app.asar.unpacked');
+-helperPath = helperPath.replace('node_modules.asar', 'node_modules.asar.unpacked');
++// A current external embedded-runtime consumer supplies a non-sibling helper.
++var helperPath = process.env.DSH_NODE_PTY_SPAWN_HELPER;
++if (helperPath) {
++    helperPath = path.resolve(helperPath);
++}
++else {
++    var executableSibling = process.execPath + '-spawn-helper';
++    if (fs.existsSync(executableSibling)) {
++        helperPath = executableSibling;
++    }
++    else {
++        helperPath = native.dir + '/spawn-helper';
++        helperPath = path.resolve(__dirname, helperPath);
++        helperPath = helperPath.replace('app.asar', 'app.asar.unpacked');
++        helperPath = helperPath.replace('node_modules.asar', 'node_modules.asar.unpacked');
++    }
++}
+ var DEFAULT_FILE = 'sh';
+ var DEFAULT_NAME = 'xterm';
+ var DESTROY_SOCKET_TIMEOUT_MS = 200;
+diff --git a/src/unixTerminal.ts b/src/unixTerminal.ts
+index 98733dc0cd752b554bd94e45904ca341ad141bba..fa234291206617ae5a6d8605abf9771220392d17 100644
+--- a/src/unixTerminal.ts
++++ b/src/unixTerminal.ts
+@@ -14,10 +14,21 @@ import { assign, loadNativeModule } from './utils';
+
+ const native = loadNativeModule('pty');
+ const pty: IUnixNative = native.module;
+-let helperPath = native.dir + '/spawn-helper';
+-helperPath = path.resolve(__dirname, helperPath);
+-helperPath = helperPath.replace('app.asar', 'app.asar.unpacked');
+-helperPath = helperPath.replace('node_modules.asar', 'node_modules.asar.unpacked');
++// A current external embedded-runtime consumer supplies a non-sibling helper.
++let helperPath = process.env.DSH_NODE_PTY_SPAWN_HELPER;
++if (helperPath) {
++  helperPath = path.resolve(helperPath);
++} else {
++  const executableSibling = process.execPath + '-spawn-helper';
++  if (fs.existsSync(executableSibling)) {
++    helperPath = executableSibling;
++  } else {
++    helperPath = native.dir + '/spawn-helper';
++    helperPath = path.resolve(__dirname, helperPath);
++    helperPath = helperPath.replace('app.asar', 'app.asar.unpacked');
++    helperPath = helperPath.replace('node_modules.asar', 'node_modules.asar.unpacked');
++  }
++}
+
+ const DEFAULT_FILE = 'sh';
+ const DEFAULT_NAME = 'xterm';

pnpm-lock.yaml

@@ -6,6 +6,7 @@ settings:
 
 patchedDependencies:
   '@earendil-works/pi-tui@0.80.7': 6c30c5386c0159131e1361023cddf31377f5728962524841964373312c1ed946
+  node-pty@1.1.0: 7a0c04f1f49d798a9ffe2f7f414c01064a44ca2489772d0c3e1235ab336755e6
 
 importers:
 
@@ -601,6 +602,9 @@ importers:
       '@deepseek-ai/dsh-tool-ask-user':
         specifier: workspace:*
         version: link:../packages/ui/tool-ask-user
+      '@deepseek-ai/dsh-tool-bash-persistent':
+        specifier: workspace:*
+        version: link:../packages/pty/tool-bash-persistent
       '@deepseek-ai/dsh-tool-cordis':
         specifier: workspace:*
         version: link:../packages/cordis/tool-cordis
@@ -625,6 +629,9 @@ importers:
       '@deepseek-ai/dsh-tool-session-query':
         specifier: workspace:*
         version: link:../packages/session-query/tool-session-query
+      '@deepseek-ai/dsh-tool-str-replace-editor':
+        specifier: workspace:*
+        version: link:../packages/fs/tool-str-replace-editor
       '@deepseek-ai/dsh-tool-subagent':
         specifier: workspace:*
         version: link:../packages/subagent/tool-subagent
@@ -658,7 +665,7 @@ importers:
     devDependencies:
       node-pty:
         specifier: 1.1.0
-        version: 1.1.0
+        version: 1.1.0(patch_hash=7a0c04f1f49d798a9ffe2f7f414c01064a44ca2489772d0c3e1235ab336755e6)
 
   packages/acp/acp:
     dependencies:
@@ -2657,6 +2664,52 @@ importers:
         specifier: ^4.0.0-rc.6
         version: 4.0.0-rc.7(@cordisjs/plugin-include@1.0.4)(@cordisjs/plugin-loader@1.0.0-rc.5)
 
+  packages/fs/tool-str-replace-editor:
+    dependencies:
+      schemastery:
+        specifier: ^3.18.0
+        version: 3.18.0
+    devDependencies:
+      '@deepseek-ai/dsh-agent':
+        specifier: workspace:^
+        version: link:../../core/agent
+      '@deepseek-ai/dsh-fs':
+        specifier: workspace:^
+        version: link:../fs
+      '@deepseek-ai/dsh-fs-local':
+        specifier: workspace:^
+        version: link:../fs-local
+      '@deepseek-ai/dsh-fs-policy':
+        specifier: workspace:^
+        version: link:../fs-policy
+      '@deepseek-ai/dsh-fs-sandbox':
+        specifier: workspace:^
+        version: link:../fs-sandbox
+      '@deepseek-ai/dsh-invariants':
+        specifier: workspace:^
+        version: link:../../support/invariants
+      '@deepseek-ai/dsh-llm':
+        specifier: workspace:^
+        version: link:../../llm/llm
+      '@deepseek-ai/dsh-sandbox':
+        specifier: workspace:^
+        version: link:../../sandbox/sandbox
+      '@deepseek-ai/dsh-sandbox-policy':
+        specifier: workspace:^
+        version: link:../../sandbox/sandbox-policy
+      '@deepseek-ai/dsh-session':
+        specifier: workspace:^
+        version: link:../../core/session
+      '@deepseek-ai/dsh-system-prompt':
+        specifier: workspace:^
+        version: link:../../core/system-prompt
+      '@deepseek-ai/dsh-tools':
+        specifier: workspace:^
+        version: link:../../core/tools
+      cordis:
+        specifier: ^4.0.0-rc.7
+        version: 4.0.0-rc.7(@cordisjs/plugin-include@1.0.4)(@cordisjs/plugin-loader@1.0.0-rc.5)
+
   packages/goal/command-goal:
     devDependencies:
       '@cordisjs/plugin-loader':
@@ -3459,7 +3512,7 @@ importers:
     dependencies:
       node-pty:
         specifier: ^1.1.0
-        version: 1.1.0
+        version: 1.1.0(patch_hash=7a0c04f1f49d798a9ffe2f7f414c01064a44ca2489772d0c3e1235ab336755e6)
       schemastery:
         specifier: ^3.18.0
         version: 3.18.0
@@ -3489,6 +3542,55 @@ importers:
         specifier: ^4.0.0-rc.7
         version: 4.0.0-rc.7(@cordisjs/plugin-include@1.0.4)(@cordisjs/plugin-loader@1.0.0-rc.5)
 
+  packages/pty/tool-bash-persistent:
+    dependencies:
+      schemastery:
+        specifier: ^3.18.0
+        version: 3.18.0
+    devDependencies:
+      '@cordisjs/plugin-include':
+        specifier: workspace:^
+        version: link:../../../vendor/include
+      '@cordisjs/plugin-loader':
+        specifier: workspace:^
+        version: link:../../../vendor/loader
+      '@deepseek-ai/dsh-agent':
+        specifier: workspace:^
+        version: link:../../core/agent
+      '@deepseek-ai/dsh-invariants':
+        specifier: workspace:^
+        version: link:../../support/invariants
+      '@deepseek-ai/dsh-llm':
+        specifier: workspace:^
+        version: link:../../llm/llm
+      '@deepseek-ai/dsh-pty':
+        specifier: workspace:^
+        version: link:../pty
+      '@deepseek-ai/dsh-pty-local':
+        specifier: workspace:^
+        version: link:../pty-local
+      '@deepseek-ai/dsh-sandbox':
+        specifier: workspace:^
+        version: link:../../sandbox/sandbox
+      '@deepseek-ai/dsh-sandbox-policy':
+        specifier: workspace:^
+        version: link:../../sandbox/sandbox-policy
+      '@deepseek-ai/dsh-session':
+        specifier: workspace:^
+        version: link:../../core/session
+      '@deepseek-ai/dsh-system-prompt':
+        specifier: workspace:^
+        version: link:../../core/system-prompt
+      '@deepseek-ai/dsh-timeout':
+        specifier: workspace:^
+        version: link:../../util/timeout
+      '@deepseek-ai/dsh-tools':
+        specifier: workspace:^
+        version: link:../../core/tools
+      cordis:
+        specifier: ^4.0.0-rc.7
+        version: 4.0.0-rc.7(@cordisjs/plugin-include@vendor+include)(@cordisjs/plugin-loader@vendor+loader)
+
   packages/pty/tool-pty:
     dependencies:
       schemastery:
@@ -5747,6 +5849,12 @@ importers:
       '@deepseek-ai/dsh-plan-mode':
         specifier: workspace:^
         version: link:../../packages/plan/plan-mode
+      '@deepseek-ai/dsh-pty':
+        specifier: workspace:^
+        version: link:../../packages/pty/pty
+      '@deepseek-ai/dsh-pty-local':
+        specifier: workspace:^
+        version: link:../../packages/pty/pty-local
       '@deepseek-ai/dsh-repeat-tool-guard':
         specifier: workspace:^
         version: link:../../packages/guard/repeat-tool-guard
@@ -5756,6 +5864,9 @@ importers:
       '@deepseek-ai/dsh-sandbox':
         specifier: workspace:^
         version: link:../../packages/sandbox/sandbox
+      '@deepseek-ai/dsh-sandbox-local':
+        specifier: workspace:^
+        version: link:../../packages/sandbox/sandbox-local
       '@deepseek-ai/dsh-sandbox-policy':
         specifier: workspace:^
         version: link:../../packages/sandbox/sandbox-policy
@@ -5846,6 +5957,9 @@ importers:
       '@deepseek-ai/dsh-tool-bash':
         specifier: workspace:^
         version: link:../../packages/bash/tool-bash
+      '@deepseek-ai/dsh-tool-bash-persistent':
+        specifier: workspace:^
+        version: link:../../packages/pty/tool-bash-persistent
       '@deepseek-ai/dsh-tool-cordis':
         specifier: workspace:^
         version: link:../../packages/cordis/tool-cordis
@@ -5858,6 +5972,9 @@ importers:
       '@deepseek-ai/dsh-tool-skill':
         specifier: workspace:^
         version: link:../../packages/skill/tool-skill
+      '@deepseek-ai/dsh-tool-str-replace-editor':
+        specifier: workspace:^
+        version: link:../../packages/fs/tool-str-replace-editor
       '@deepseek-ai/dsh-tool-subagent':
         specifier: workspace:^
         version: link:../../packages/subagent/tool-subagent
@@ -15549,7 +15666,7 @@ snapshots:
       fetch-blob: 3.2.0
       formdata-polyfill: 4.0.10
 
-  node-pty@1.1.0:
+  node-pty@1.1.0(patch_hash=7a0c04f1f49d798a9ffe2f7f414c01064a44ca2489772d0c3e1235ab336755e6):
     dependencies:
       node-addon-api: 7.1.1
 

pnpm-workspace.yaml

@@ -39,6 +39,9 @@ allowBuilds:
   node-addon-require-builtin: false
   # JSONL durability calls MoveFileExW with write-through publication on Windows.
   koffi: true
+  # The Python runtime deploy includes the reviewed workspace postinstall that
+  # restores the executable bit on node-pty's macOS spawn helper.
+  '@deepseek-ai/dsh-pty-local@file:packages/pty/pty-local': true
 
 # The Landlock launcher family is our own sibling-repo release, consumed
 # fresh (hours old at each coordinated bump) — the release-age quarantine
@@ -58,3 +61,4 @@ minimumReleaseAgeExclude:
 
 patchedDependencies:
   '@earendil-works/pi-tui@0.80.7': patches/@earendil-works__pi-tui@0.80.7.patch
+  node-pty@1.1.0: patches/node-pty@1.1.0.patch

python/README.i18n.yaml

@@ -2,5 +2,5 @@
 # side as of the last confirmed-consistent state. Both languages carry equal authority;
 # after editing either side, bring the other along and re-record with:
 #   pnpm run verify-translation-pairing --write python/README.md
-README.md: d2b6a1cfe9897026d567b2def301799069c350fb
-README.zh.md: f519fbc0a85539e4dc053785e1a8d6759e6fc894
+README.md: dfd9d909122f9245a19fe91d8a394156795b13ae
+README.zh.md: b4b2b472e3164b5bf1fd2cfd77512de5be354f61

python/README.md

@@ -22,7 +22,7 @@ pnpm exec tsx scripts/build-exe-for-python-sdk.ts --skip-build    # lib/ artifac
 pnpm exec tsx scripts/build-exe-for-python-sdk.ts --targets=node24-linux-x64,node24-linux-arm64,node24-macos-arm64
 ```
 
-Products land in `dist-exe/` and are synced into this package at `sdk-runtime/src/deepseek_harness_runtime/runtime/dsh-jsonrpc-agent-pkg-<platform>-<arch>` (platform: `linux`/`macos`; arch: `x64`/`arm64`) — after a local build the SDK finds the executable with no further setup. The `build-exe-for-python-sdk` CI workflow (manual dispatch, or the `build-exe` PR label) exercises the same binaries. A full three-target run retains four release wheels; a subset dispatch retains the SDK wheel and selected platform wheels. Which plugins the exe bundles and how the carriers are organized: [sdk-runtime README](sdk-runtime/README.md); the build also refreshes the dev-only node carrier (see "against the Node source" below).
+Products land in `dist-exe/` and are synced into this package as `sdk-runtime/src/deepseek_harness_runtime/runtime/dsh-jsonrpc-agent-pkg-<platform>-<arch>` (platform: `linux`/`macos`; arch: `x64`/`arm64`); macOS builds also sync the matching `-spawn-helper` required by `node-pty`. After a local build the SDK finds the runtime with no further setup. The `build-exe-for-python-sdk` CI workflow (manual dispatch, or the `build-exe` PR label) exercises the same products. A full three-target run retains four release wheels; a subset dispatch retains the SDK wheel and selected platform wheels. Which plugins the exe bundles and how the carriers are organized: [sdk-runtime README](sdk-runtime/README.md); the build also refreshes the dev-only node carrier (see "against the Node source" below).
 
 ## Validating the SDK against the executable
 

python/README.zh.md

@@ -22,7 +22,7 @@ pnpm exec tsx scripts/build-exe-for-python-sdk.ts --skip-build    # lib/ artifac
 pnpm exec tsx scripts/build-exe-for-python-sdk.ts --targets=node24-linux-x64,node24-linux-arm64,node24-macos-arm64
 ```
 
-产物落入 `dist-exe/`，并同步进本包的 `sdk-runtime/src/deepseek_harness_runtime/runtime/dsh-jsonrpc-agent-pkg-<platform>-<arch>`（platform：`linux`/`macos`；arch：`x64`/`arm64`），本地构建完成后 SDK 不需要额外设置就能找到可执行文件。`build-exe-for-python-sdk` CI 工作流（手动触发，或给 PR 打 `build-exe` 标签）会测试同样的二进制。完整构建三个目标时保留 4 个发布用 wheel 包；手动选择部分目标时保留 SDK wheel 与所选平台的 wheel。exe 内置哪些插件、载体如何组织，见 [sdk-runtime README](sdk-runtime/README.md)；构建还会顺带刷新仅供开发使用的 `node` 载体（见下文「对着 Node 源码运行」）。
+产物落入 `dist-exe/`，并同步进本包的 `sdk-runtime/src/deepseek_harness_runtime/runtime/dsh-jsonrpc-agent-pkg-<platform>-<arch>`（platform：`linux`/`macos`；arch：`x64`/`arm64`）；macOS 构建还会同步 `node-pty` 所需的同名 `-spawn-helper` 伴随文件。本地构建完成后 SDK 不需要额外设置就能找到运行时。`build-exe-for-python-sdk` CI 工作流（手动触发，或给 PR 打 `build-exe` 标签）会测试同样的产物。完整构建三个目标时保留 4 个发布用 wheel 包；手动选择部分目标时保留 SDK wheel 与所选平台的 wheel。exe 内置哪些插件、载体如何组织，见 [sdk-runtime README](sdk-runtime/README.md)；构建还会顺带刷新仅供开发使用的 `node` 载体（见下文「对着 Node 源码运行」）。
 
 ## 用可执行文件验证 SDK
 

python/sdk-runtime/README.i18n.yaml

@@ -2,5 +2,5 @@
 # side as of the last confirmed-consistent state. Both languages carry equal authority;
 # after editing either side, bring the other along and re-record with:
 #   pnpm run verify-translation-pairing --write python/sdk-runtime/README.md
-README.md: f2ccd8939e497d10359aafe8b1bd8b364875ed98
-README.zh.md: 5e11ee27568a7b1d7321ffb8486aba4adb1603e8
+README.md: 07bb3c574b3cd49f1dc74f0e9d9bd1bb7ca9b216
+README.zh.md: 0613b6faf68ea3bdb6c9b673677fc483b79dab72

python/sdk-runtime/README.md

@@ -8,19 +8,19 @@ Runtime carrier package for the Python SDK (dist `deepseek-harness-runtime-bin`,
 
 Two carriers coexist under `src/deepseek_harness_runtime/runtime/`, both injected by the repo's `scripts/build-exe-for-python-sdk.ts` build and both gitignored:
 
-- **exe (production)** — single-file executables `dsh-jsonrpc-agent-pkg-<platform>-<arch>` (platform: `linux`/`macos`; arch: `x64`/`arm64`). No Node installation needed on the target machine. This is the only carrier that ships in wheel distributions; this package does not publish sdists.
+- **exe (production)** — a single-file Node executable `dsh-jsonrpc-agent-pkg-<platform>-<arch>` (platform: `linux`/`macos`; arch: `x64`/`arm64`). macOS builds also ship the native `-spawn-helper` sibling that `node-pty` uses there. No Node installation is needed on the target machine. This is the only carrier that ships in wheel distributions; this package does not publish sdists.
 - **node (dev-only)** — the full deploy closure under `runtime/node/` (`package.json` + `node_modules/`), executed as `node runtime/node/node_modules/@deepseek-ai/dsh-jsonrpc-demo/lib/bin.js` on a system Node >= 22.19. It is the current checkout's source build, meant for repo-local development and verification only; it is never selected automatically and is excluded from distributions.
 
 Both carriers hold the same content, defined once: the [package.json](package.json) at this package's root is the deploy root of the single-exe pipeline — a pure dependency manifest (no code of its own) whose dependency closure IS both the plugin set compiled into the exe and the tree materialized into `runtime/node/`. Adding a plugin to the distribution means adding one dependency line there and rebuilding.
 
 A missing exe raises `FileNotFoundError` naming both acquisition routes: build via `scripts/build-exe-for-python-sdk.ts` in a deepseek-harness checkout, or install the matching platform runtime wheel produced by the `build-exe-for-python-sdk` CI workflow. A missing dev-only node carrier names its sole route, the build script. The workflow retains wheels rather than standalone executable archives. Acquisition strategy is deliberately separate from the lookup interface, so an on-demand download can replace it later without touching callers.
 
-Each wheel contains exactly one executable. The fixed tags are `py3-none-manylinux_2_28_x86_64`, `py3-none-manylinux_2_28_aarch64`, and `py3-none-macosx_11_0_arm64`; the build hook rejects `py3-none-any`, absent or multiple executables, and unsupported platform tags. The repository root `package.json` supplies the shared version for this package and the SDK, and a `python-vX.Y.Z` release tag must match it.
+Each wheel contains exactly one runtime executable. The macOS wheel also contains its matching native spawn helper; a missing sidecar makes that installation incomplete and is a hard startup error, even for a selected Cordis composition that does not use PTY tools. Linux wheels contain no spawn helper because `node-pty` uses the staged `pty.node` addon directly. The fixed tags are `py3-none-manylinux_2_28_x86_64`, `py3-none-manylinux_2_28_aarch64`, and `py3-none-macosx_11_0_arm64`; the build hook rejects `py3-none-any`, absent or multiple runtime files, non-executable files, and unsupported platform tags. The repository root `package.json` supplies the shared version for this package and the SDK, and a `python-vX.Y.Z` release tag must match it.
 
 ## Resolution API
 
 - `resolve_bundled_launch_args(mode=None) -> tuple[str, ...]` — the argv tuple that launches the bundled runtime: `(exe_path,)` in exe mode, `(node_path, bin_js_path)` in node mode. Mode selection: explicit argument > `DSH_RUNTIME_MODE` env var (`exe` | `node`) > automatic. Automatic resolution finds the production exe ONLY — the dev-only node carrier must be opted into explicitly so a production deployment can never silently ride on a source build.
-- `bundled_runtime_path() -> Path` — the platform exe path (exe carrier only; the node carrier has no single-path equivalent and launches via the argv tuple above).
+- `bundled_runtime_path() -> Path` — the platform exe path (exe carrier only; on macOS it validates that the required sibling `-spawn-helper` is also installed). The node carrier has no single-path equivalent and launches via the argv tuple above.
 - `bundled_default_config_path() -> Path` — the checked-in default config (see below).
 - `bundled_package_dir() -> Path` — the installed package data root.
 

python/sdk-runtime/README.zh.md

@@ -8,19 +8,19 @@ Python SDK 的运行时载体包（分发名 `deepseek-harness-runtime-bin`，
 
 两种载体并存于 `src/deepseek_harness_runtime/runtime/` 之下，均由仓库的 `scripts/build-exe-for-python-sdk.ts` 构建注入，且均被 git 忽略：
 
-- **exe（生产）**——单文件可执行程序 `dsh-jsonrpc-agent-pkg-<platform>-<arch>`（platform：`linux`/`macos`；arch：`x64`/`arm64`）。目标机器无需安装 Node。这是唯一随 wheel 包分发的载体；本包不发布 sdist。
+- **exe（生产）**——单文件 Node 可执行程序 `dsh-jsonrpc-agent-pkg-<platform>-<arch>`（platform：`linux`/`macos`；arch：`x64`/`arm64`）。macOS 构建还会随附 `node-pty` 在该平台使用的原生 `-spawn-helper` 伴随文件。目标机器无需安装 Node。这是唯一随 wheel 包分发的载体；本包不发布 sdist。
 - **node（仅限开发）**——`runtime/node/` 下的完整部署闭包（`package.json` + `node_modules/`），在系统 Node >= 22.19 上以 `node runtime/node/node_modules/@deepseek-ai/dsh-jsonrpc-demo/lib/bin.js` 执行。它是当前检出的源码构建，仅用于仓库本地的开发与验证；不会被自动选中，也不进入分发物。
 
 两种载体承载相同的内容，且只定义一次：本包根目录的 [package.json](package.json) 是 single-exe 流水线的部署根目录——一份零代码的纯依赖 manifest，其依赖闭包既是编译进 exe 的插件集，也是物化到 `runtime/node/` 的文件树。往分发物里加插件，就是在那里加一行依赖再重新构建。
 
 exe 缺失时抛出 `FileNotFoundError`，并写明两种获取途径：在 deepseek-harness 检出中经 `scripts/build-exe-for-python-sdk.ts` 构建，或安装 `build-exe-for-python-sdk` CI 工作流生成的对应平台运行时 wheel 包。仅限开发的 node 载体缺失时只提示构建脚本这一条途径。该工作流只保留 wheel 包，不保留独立 exe 归档。获取策略与查找接口刻意分离，之后可以换成按需下载而不改动任何调用方。
 
-每个 wheel 包只包含一个可执行文件。固定标签为 `py3-none-manylinux_2_28_x86_64`、`py3-none-manylinux_2_28_aarch64` 与 `py3-none-macosx_11_0_arm64`；构建钩子会拒绝 `py3-none-any`、不存在可执行文件、存在多个可执行文件以及不支持的平台标签。仓库根目录的 `package.json` 为本包和 SDK 提供共同版本，`python-vX.Y.Z` 发布标签必须与其匹配。
+每个 wheel 包只包含一个运行时可执行文件。macOS wheel 包还包含与其匹配的原生 spawn helper；缺少伴随文件意味着该安装不完整，并会在启动时硬失败，即使所选 Cordis 组合不使用 PTY 工具也是如此。Linux wheel 包不包含 spawn helper，因为 `node-pty` 直接使用暂存的 `pty.node` 原生插件。固定标签为 `py3-none-manylinux_2_28_x86_64`、`py3-none-manylinux_2_28_aarch64` 与 `py3-none-macosx_11_0_arm64`；构建钩子会拒绝 `py3-none-any`、不存在运行时文件、存在多个运行时文件、文件不可执行以及不支持的平台标签。仓库根目录的 `package.json` 为本包和 SDK 提供共同版本，`python-vX.Y.Z` 发布标签必须与其匹配。
 
 ## 解析 API
 
 - `resolve_bundled_launch_args(mode=None) -> tuple[str, ...]`——启动内置运行时的 argv 元组：exe 模式下为 `(exe_path,)`，node 模式下为 `(node_path, bin_js_path)`。模式选择：显式参数 > `DSH_RUNTIME_MODE` 环境变量（`exe` | `node`）> 自动。自动解析只找生产 exe——仅限开发的 node 载体必须显式选用，从而生产部署绝不会悄悄跑在源码构建上。
-- `bundled_runtime_path() -> Path`——平台 exe 路径（仅 exe 载体；node 载体没有单一路径的等价物，经由上面的 argv 元组启动）。
+- `bundled_runtime_path() -> Path`——平台 exe 路径（仅 exe 载体，并会在 macOS 上校验必要的 `-spawn-helper` 伴随文件也已安装）。node 载体没有单一路径的等价物，经由上面的 argv 元组启动。
 - `bundled_default_config_path() -> Path`——检入的默认配置（见下文）。
 - `bundled_package_dir() -> Path`——已安装包的数据根目录。
 

python/sdk-runtime/hatch_build.py

@@ -46,15 +46,18 @@ class RuntimeBuildHook(BuildHookInterface):
             )
         expected_executable = matches[0][1]
         runtime_dir = Path(self.root) / "src" / "deepseek_harness_runtime" / "runtime"
-        executables = sorted(runtime_dir.glob("dsh-jsonrpc-agent-pkg-*") if runtime_dir.is_dir() else [])
-        if [path.name for path in executables] != [expected_executable]:
-            found = ", ".join(path.name for path in executables) or "none"
+        runtime_files = sorted(runtime_dir.glob("dsh-jsonrpc-agent-pkg-*") if runtime_dir.is_dir() else [])
+        expected_files = [expected_executable]
+        if "-macos-" in expected_executable:
+            expected_files.append(f"{expected_executable}-spawn-helper")
+        found_files = [path.name for path in runtime_files]
+        if found_files != expected_files:
             raise RuntimeError(
-                f"runtime wheel {platform_tag} must contain only {expected_executable}; found {found}"
+                f"runtime wheel {platform_tag} payload must be {expected_files}; found {found_files}"
             )
-        if executables[0].stat().st_mode & stat.S_IXUSR == 0:
-            raise RuntimeError(f"runtime executable is not executable: {executables[0]}")
-
+        for executable in runtime_files:
+            if executable.stat().st_mode & stat.S_IXUSR == 0:
+                raise RuntimeError(f"runtime executable is not executable: {executable}")
         build_data["pure_python"] = False
         build_data["infer_tag"] = False
         build_data["tag"] = f"py3-none-{platform_tag}"

python/sdk-runtime/package.json

@@ -42,6 +42,8 @@
     "@deepseek-ai/dsh-llm-pi-ai": "workspace:^",
     "@deepseek-ai/dsh-llm-retry": "workspace:^",
     "@deepseek-ai/dsh-plan-mode": "workspace:^",
+    "@deepseek-ai/dsh-pty": "workspace:^",
+    "@deepseek-ai/dsh-pty-local": "workspace:^",
     "@deepseek-ai/dsh-subprocess": "workspace:^",
     "@deepseek-ai/dsh-subprocess-local": "workspace:^",
     "@deepseek-ai/dsh-permission": "workspace:^",
@@ -49,6 +51,7 @@
     "@deepseek-ai/dsh-repeat-tool-guard": "workspace:^",
     "@deepseek-ai/dsh-retention": "workspace:^",
     "@deepseek-ai/dsh-sandbox": "workspace:^",
+    "@deepseek-ai/dsh-sandbox-local": "workspace:^",
     "@deepseek-ai/dsh-sandbox-policy": "workspace:^",
     "@deepseek-ai/dsh-scope": "workspace:^",
     "@deepseek-ai/dsh-session": "workspace:^",
@@ -75,7 +78,9 @@
     "@deepseek-ai/dsh-tool-ask-user": "workspace:^",
     "@deepseek-ai/dsh-tool-bash": "workspace:^",
     "@deepseek-ai/dsh-tool-cordis": "workspace:^",
+    "@deepseek-ai/dsh-tool-bash-persistent": "workspace:^",
     "@deepseek-ai/dsh-tool-fs": "workspace:^",
+    "@deepseek-ai/dsh-tool-str-replace-editor": "workspace:^",
     "@deepseek-ai/dsh-tool-goal": "workspace:^",
     "@deepseek-ai/dsh-tool-skill": "workspace:^",
     "@deepseek-ai/dsh-tool-subagent": "workspace:^",

python/sdk-runtime/src/deepseek_harness_runtime/__init__.py

@@ -3,9 +3,10 @@
 Two runtime carriers coexist under ``runtime/``, both injected by the repo's
 ``scripts/build-exe-for-python-sdk.ts`` build (neither is checked into git):
 
-- **exe (production)**: single-file executables named
+- **exe (production)**: single-file Node executables named
   ``dsh-jsonrpc-agent-pkg-<platform>-<arch>`` (platform in {linux, macos}, arch in
-  {x64, arm64}); the target machine needs no Node installation.
+  {x64, arm64}); macOS also uses a sibling ``-spawn-helper``. The target machine
+  needs no Node installation.
 - **node (dev-only)**: the full deploy closure under ``runtime/node/``
   (``package.json`` + ``node_modules/``), executed as ``node
   runtime/node/node_modules/@deepseek-ai/dsh-jsonrpc-demo/lib/bin.js`` on a
@@ -69,11 +70,11 @@ def bundled_default_config_path() -> Path:
 def bundled_runtime_path() -> Path:
     """Absolute path of the bundled single-file runtime executable for the current platform.
 
-    Raises FileNotFoundError when the platform is unsupported or the executable
-    has not been placed into this package; the message names the acquisition
-    routes (acquisition strategy is deliberately separate from this lookup
-    interface, so an on-demand download can replace it without touching
-    callers).
+    Raises FileNotFoundError when the platform is unsupported, the executable
+    has not been placed into this package, or the required macOS spawn helper is
+    missing; the message names the acquisition routes (acquisition strategy is
+    deliberately separate from this lookup interface, so an on-demand download
+    can replace it without touching callers).
     """
     tag = _current_platform_tag()
     path = bundled_package_dir() / "runtime" / f"dsh-jsonrpc-agent-pkg-{tag}"
@@ -82,6 +83,13 @@ def bundled_runtime_path() -> Path:
             f"deepseek-harness-runtime-bin is missing the runtime executable at {path}. "
             + _EXE_ACQUISITION_HINT
         )
+    if tag.startswith("macos-"):
+        helper = Path(f"{path}-spawn-helper")
+        if not helper.is_file():
+            raise FileNotFoundError(
+                f"deepseek-harness-runtime-bin is missing the node-pty spawn helper at {helper}. "
+                + _EXE_ACQUISITION_HINT
+            )
     return path
 
 

python/sdk/src/deepseek_harness/api.py

@@ -191,7 +191,9 @@ def final_response(events: list[JsonObject]) -> str:
         data = event.get("data")
         if not isinstance(data, dict):
             continue
-        content = data.get("content")
+        message = data.get("message")
+        content_owner = message if isinstance(message, dict) else data
+        content = content_owner.get("content")
         if not isinstance(content, list):
             continue
         parts: list[str] = []

python/sdk/tests/test_client.py

@@ -46,7 +46,12 @@ for line in sys.stdin:
                 "sessionId": params["sessionId"],
                 "event": {
                     "type": "assistant/message",
-                    "data": {"content": [{"type": "text", "text": "hello from runtime"}]},
+                    "data": {
+                        "message": {
+                            "role": "assistant",
+                            "content": [{"type": "text", "text": "hello from runtime"}],
+                        },
+                    },
                 },
             },
         }), flush=True)

python/sdk/tests/test_release_version.py

@@ -37,3 +37,24 @@ def test_repository_version_rejects_non_stable_versions(tmp_path: Path) -> None:
 
     with pytest.raises(ValueError, match="must be stable X.Y.Z"):
         build_python_release.repository_version(tmp_path)
+
+
+@pytest.mark.parametrize(("target", "with_helper"), [("linux-x64", False), ("macos-arm64", True)])
+def test_stage_runtime_copies_platform_payload(
+    tmp_path: Path, target: str, with_helper: bool
+) -> None:
+    executable = tmp_path / f"dsh-jsonrpc-agent-pkg-{target}"
+    executable.write_bytes(b"runtime")
+    executable.chmod(0o755)
+    expected = {executable.name: b"runtime"}
+    if with_helper:
+        spawn_helper = Path(f"{executable}-spawn-helper")
+        spawn_helper.write_bytes(b"helper")
+        spawn_helper.chmod(0o755)
+        expected[spawn_helper.name] = b"helper"
+    destination = tmp_path / "staging"
+
+    build_python_release.stage_runtime(destination, "1.2.3", executable, executable.name)
+
+    runtime_dir = destination / "src" / "deepseek_harness_runtime" / "runtime"
+    assert {path.name: path.read_bytes() for path in runtime_dir.glob("dsh-jsonrpc-agent-pkg-*")} == expected

python/sdk/tests/test_runtime_resolution.py

@@ -2,6 +2,9 @@
 
 from __future__ import annotations
 
+from pathlib import Path
+
+import deepseek_harness_runtime as runtime
 import pytest
 
 from deepseek_harness_runtime import (
@@ -39,3 +42,20 @@ def test_explicit_mode_wins_over_env_mode(monkeypatch: pytest.MonkeyPatch) -> No
     except FileNotFoundError:
         return  # explicit 'exe' was honored; only the artifact is missing
     assert args[0].endswith(("-x64", "-arm64"))
+
+
+def test_runtime_requires_spawn_helper_only_on_macos(
+    tmp_path: Path, monkeypatch: pytest.MonkeyPatch
+) -> None:
+    runtime_dir = tmp_path / "runtime"
+    runtime_dir.mkdir()
+    linux = runtime_dir / "dsh-jsonrpc-agent-pkg-linux-x64"
+    linux.touch()
+    (runtime_dir / "dsh-jsonrpc-agent-pkg-macos-arm64").touch()
+    monkeypatch.setattr(runtime, "bundled_package_dir", lambda: tmp_path)
+
+    monkeypatch.setattr(runtime, "_current_platform_tag", lambda: "macos-arm64")
+    with pytest.raises(FileNotFoundError, match="node-pty spawn helper"):
+        runtime.bundled_runtime_path()
+    monkeypatch.setattr(runtime, "_current_platform_tag", lambda: "linux-x64")
+    assert runtime.bundled_runtime_path() == linux

scripts/build-exe-for-python-sdk.ts

@@ -7,9 +7,9 @@
  */
 
 import { spawn } from 'node:child_process'
-import { existsSync, mkdirSync, statSync } from 'node:fs'
-import { copyFile, readFile, rm, writeFile } from 'node:fs/promises'
-import { basename, join, resolve, sep } from 'node:path'
+import { existsSync, statSync } from 'node:fs'
+import { chmod, copyFile, mkdir, readFile, rm, writeFile } from 'node:fs/promises'
+import { basename, dirname, join, resolve, sep } from 'node:path'
 import { parseArgs } from 'node:util'
 
 const root = resolve(import.meta.dirname, '..')
@@ -254,6 +254,10 @@ class SingleExeBuild {
       '--config.node-linker=hoisted',
       '--config.auto-install-peers=false',
       '--config.link-workspace-packages=true',
+      // The production closure intentionally omits the patched dev-only
+      // @earendil-works/pi-tui package. The root frozen install still validates
+      // every patch; this exception is scoped only to the production deploy.
+      '--config.allow-unused-patches=true',
       this.staging,
     ])
     if (this.cli.dryRun) {
@@ -285,11 +289,12 @@ class SingleExeBuild {
   /**
    * Package one target; SEA mode accepts one target per invocation.
    * @param target - the pkg target triple to build.
-   * @returns the canonical product path `<out>/dsh-jsonrpc-agent-pkg-<platform>-<arch>`.
+   * @returns the executable path and, on macOS, its helper path.
    */
-  async pack(target: Target): Promise<string> {
+  async pack(target: Target): Promise<string[]> {
     const product = join(this.outDir, `${OUTPUT_BASENAME}-${target.platform}-${target.arch}`)
-    if (!this.cli.dryRun) mkdirSync(this.outDir, { recursive: true })
+    await this.prepareNativePty(target)
+    if (!this.cli.dryRun) await mkdir(this.outDir, { recursive: true })
     await this.run(`pkg ${target.spec}`, pnpmBin(), [
       'dlx',
       PKG_SPEC,
@@ -303,7 +308,43 @@ class SingleExeBuild {
     if (!this.cli.dryRun && !existsSync(product)) {
       throw new Error(`build-exe-for-python-sdk: product ${product} is missing after the pkg run; inspect ${this.outDir}.`)
     }
-    return product
+    if (target.platform !== 'macos') return [product]
+    const spawnHelper = `${product}-spawn-helper`
+    const source = join(this.staging, 'node_modules', 'node-pty', 'prebuilds', `darwin-${target.arch}`, 'spawn-helper')
+    if (this.cli.dryRun) {
+      console.log(`build-exe-for-python-sdk: [dry-run] cp ${source} ${spawnHelper}`)
+    } else {
+      await copyFile(source, spawnHelper)
+      await chmod(spawnHelper, 0o755)
+    }
+    return [product, spawnHelper]
+  }
+
+  /**
+   * Put the target node-pty addon in the staged closure. Linux npm installs
+   * build it from source, but legacy deploy omits that side-effect directory.
+   * @param target - the pkg target whose native addon is being staged.
+   */
+  private async prepareNativePty(target: Target): Promise<void> {
+    const stagedBuild = join(this.staging, 'node_modules', 'node-pty', 'build')
+    if (this.cli.dryRun) console.log(`build-exe-for-python-sdk: [dry-run] rm -rf ${stagedBuild}`)
+    else await rm(stagedBuild, { recursive: true, force: true })
+    if (target.platform !== 'linux') return
+    const source = join(root, 'packages', 'pty', 'pty-local', 'node_modules', 'node-pty', 'build', 'Release', 'pty.node')
+    const destination = join(stagedBuild, 'Release', 'pty.node')
+    if (this.cli.dryRun) {
+      console.log(`build-exe-for-python-sdk: [dry-run] cp ${source} ${destination}`)
+      return
+    }
+    const host = Target.host()
+    if (target.platform !== host.platform || target.arch !== host.arch) {
+      throw new Error(
+        'build-exe-for-python-sdk: build the Linux runtime on its target architecture; '
+        + `target ${target.platform}-${target.arch} does not match host ${host.platform}-${host.arch}.`,
+      )
+    }
+    await mkdir(dirname(destination), { recursive: true })
+    await copyFile(source, destination)
   }
 
   /**
@@ -312,33 +353,34 @@ class SingleExeBuild {
    */
   printProducts(products: string[]): void {
     console.log(this.cli.dryRun ? 'build-exe-for-python-sdk: [dry-run] would produce:' : 'build-exe-for-python-sdk: products:')
-    for (const product of products) {
+    for (const path of products) {
       if (this.cli.dryRun) {
-        console.log(`  ${product}`)
+        console.log(`  ${path}`)
         continue
       }
-      const megabytes = statSync(product).size / (1024 * 1024)
-      console.log(`  ${product}  (${megabytes.toFixed(1)} MB)`)
+      const megabytes = statSync(path).size / (1024 * 1024)
+      console.log(`  ${path}  (${megabytes.toFixed(1)} MB)`)
     }
   }
 
   /**
-   * Copy each executable into the Python runtime package. The deployed node
+   * Copy each product into the Python runtime package. The deployed node
    * carrier is already in place, and `dist-exe/` retains upload copies.
    * @param products - the product paths returned by {@link pack}.
    */
   async syncToPythonRuntime(products: string[]): Promise<void> {
     const destDir = resolve(root, PYTHON_RUNTIME_DIR)
     if (this.cli.dryRun) {
-      for (const product of products) {
-        console.log(`build-exe-for-python-sdk: [dry-run] cp ${product} ${join(destDir, basename(product))}`)
+      for (const path of products) {
+        console.log(`build-exe-for-python-sdk: [dry-run] cp ${path} ${join(destDir, basename(path))}`)
       }
       return
     }
-    mkdirSync(destDir, { recursive: true })
-    for (const product of products) {
-      const destination = join(destDir, basename(product))
-      await copyFile(product, destination)
+    await mkdir(destDir, { recursive: true })
+    for (const path of products) {
+      const destination = join(destDir, basename(path))
+      await copyFile(path, destination)
+      await chmod(destination, statSync(path).mode & 0o777)
       console.log(`build-exe-for-python-sdk: synced ${destination}`)
     }
   }
@@ -358,7 +400,12 @@ class SingleExeBuild {
     }
     console.log(`build-exe-for-python-sdk: ${label}: ${printable}`)
     await new Promise<void>((resolvePromise, reject) => {
-      const child = spawn(command, args, { cwd: root, stdio: 'inherit' })
+      const child = spawn(command, args, {
+        cwd: root,
+        stdio: 'inherit',
+        // Artifact builds must not mutate or validate a developer's Git hooks.
+        env: { ...process.env, CI: 'true' },
+      })
       child.once('error', (error) => {
         reject(new Error(`build-exe-for-python-sdk: ${label} failed to spawn: ${error.message} (${printable})`))
       })
@@ -384,7 +431,7 @@ async function main(): Promise<void> {
   await pipeline.deployStaging()
   await pipeline.injectPkgConfig()
   const products: string[] = []
-  for (const target of cli.targets) products.push(await pipeline.pack(target))
+  for (const target of cli.targets) products.push(...await pipeline.pack(target))
   pipeline.printProducts(products)
   await pipeline.syncToPythonRuntime(products)
 }

scripts/build-python-release.py

@@ -24,6 +24,10 @@ PLATFORMS = {
 }
 
 
+def runtime_suffixes(executable_name: str) -> tuple[str, ...]:
+    return ("", "-spawn-helper") if "-macos-" in executable_name else ("",)
+
+
 def main() -> None:
     parser = argparse.ArgumentParser(description=__doc__)
     parser.add_argument("--package", choices=("sdk", "runtime"), required=True)
@@ -132,17 +136,12 @@ def stage_sdk(destination: Path, version: str) -> None:
 
 
 def stage_runtime(destination: Path, version: str, executable: Path, executable_name: str) -> None:
-    if not executable.is_file():
-        raise FileNotFoundError(f"runtime executable does not exist: {executable}")
-    if executable.stat().st_mode & stat.S_IXUSR == 0:
-        raise PermissionError(f"runtime executable is not executable: {executable}")
     copy_package(ROOT / "python" / "sdk-runtime", destination)
     rewrite_version(destination / "pyproject.toml", version)
     runtime_dir = destination / "src" / "deepseek_harness_runtime" / "runtime"
     runtime_dir.mkdir(parents=True, exist_ok=True)
-    destination_executable = runtime_dir / executable_name
-    shutil.copyfile(executable, destination_executable)
-    destination_executable.chmod(executable.stat().st_mode & 0o777)
+    for suffix in runtime_suffixes(executable_name):
+        shutil.copy2(Path(f"{executable}{suffix}"), runtime_dir / f"{executable_name}{suffix}")
 
 
 def verify_wheel(
@@ -161,16 +160,21 @@ def verify_wheel(
             raise RuntimeError(f"{wheel} has wrong WHEEL tags: {wheel_metadata.get_all('Tag')}")
         if metadata.get("Version") != version:
             raise RuntimeError(f"{wheel} has version {metadata.get('Version')}, expected {version}")
-        executables = [name for name in archive.namelist() if "/runtime/dsh-jsonrpc-agent-pkg-" in name]
+        runtime_files = [
+            name for name in archive.namelist() if "/runtime/dsh-jsonrpc-agent-pkg-" in name
+        ]
         if package == "runtime":
             assert platform is not None
-            if len(executables) != 1 or not executables[0].endswith(f"/runtime/{platform[1]}"):
-                raise RuntimeError(f"{wheel} must contain exactly {platform[1]}, found {executables}")
-            mode = archive.getinfo(executables[0]).external_attr >> 16
-            if mode & stat.S_IXUSR == 0:
-                raise RuntimeError(f"{wheel} runtime executable lost its executable bit")
-        elif executables:
-            raise RuntimeError(f"SDK wheel unexpectedly contains runtime executables: {executables}")
+            expected_files = [f"{platform[1]}{suffix}" for suffix in runtime_suffixes(platform[1])]
+            found_files = sorted(Path(name).name for name in runtime_files)
+            if found_files != expected_files:
+                raise RuntimeError(f"{wheel} runtime payload must be {expected_files}, found {found_files}")
+            for runtime_file in runtime_files:
+                mode = archive.getinfo(runtime_file).external_attr >> 16
+                if mode & stat.S_IXUSR == 0:
+                    raise RuntimeError(f"{wheel} runtime executable lost its executable bit: {runtime_file}")
+        elif runtime_files:
+            raise RuntimeError(f"SDK wheel unexpectedly contains runtime executables: {runtime_files}")
         if package == "sdk":
             requirements = metadata.get_all("Requires-Dist") or []
             expected_requirement = f"deepseek-harness-runtime-bin=={version}"

scripts/gen-tool-catalog.ts

@@ -33,9 +33,11 @@ import * as SkillLocal from '@deepseek-ai/dsh-skill-local'
 import LocalTaskService from '@deepseek-ai/dsh-tasks-local'
 import * as ToolAskUser from '@deepseek-ai/dsh-tool-ask-user'
 import * as ToolBash from '@deepseek-ai/dsh-tool-bash'
+import * as ToolBashPersistent from '@deepseek-ai/dsh-tool-bash-persistent'
 import * as ToolCordis from '@deepseek-ai/dsh-tool-cordis'
 import * as ToolFs from '@deepseek-ai/dsh-tool-fs'
 import * as ToolFsSearch from '@deepseek-ai/dsh-tool-fs-search'
+import * as ToolStrReplaceEditor from '@deepseek-ai/dsh-tool-str-replace-editor'
 import PtyService from '@deepseek-ai/dsh-pty'
 import * as ToolPty from '@deepseek-ai/dsh-tool-pty'
 import * as ToolGoal from '@deepseek-ai/dsh-tool-goal'
@@ -217,6 +219,32 @@ const TOOL_PACKAGES: ToolPackage[] = [
     note:
       'Ships in examples/cordis-agent only (a deliberate opt-in — temporary Plugin code reaches the real runtime, see .agents/notes/implemented/feature/2026-07-08-self-referential-cordis-toolset.md). Plugins created by cordis_mount may register ADDITIONAL model-visible tools until unmounted or DSH restarts; a full changed request header logs those tool-set changes.',
   },
+  {
+    pkg: '@deepseek-ai/dsh-tool-bash-persistent',
+    dir: 'tool-bash-persistent',
+    source: 'packages/pty/tool-bash-persistent/src/index.ts',
+    requires: ['ctx.tools', 'ctx.pty', 'an owning Agent at execution time'],
+    writes: ['tool/call', 'PTY shell state', 'tool/result'],
+    async mount(ctx) {
+      await ctx.plugin(PtyService)
+      await ctx.plugin(ToolBashPersistent)
+    },
+    note:
+      'One owner-isolated persistent bash tool; deployment composition supplies the PTY backend and may override the model-facing environment description.',
+  },
+  {
+    pkg: '@deepseek-ai/dsh-tool-str-replace-editor',
+    dir: 'tool-str-replace-editor',
+    source: 'packages/fs/tool-str-replace-editor/src/index.ts',
+    requires: ['ctx.tools', 'ctx.fs'],
+    writes: ['tool/call', 'fs/observed after successful file operations', 'tool/result'],
+    async mount(ctx) {
+      await ctx.plugin(LocalFileSystem)
+      await ctx.plugin(ToolStrReplaceEditor)
+    },
+    note:
+      'Standalone view/create/unique literal replace/line insert tool over the filesystem seam; it composes with any shell or terminal surface.',
+  },
   {
     pkg: '@deepseek-ai/dsh-tool-fs',
     dir: 'tool-fs',

scripts/smoke-python-runtime.py

@@ -25,6 +25,14 @@ CODE_PROMPT = "Use run_code to compute the packaged worker smoke value."
 CODE_WORKER_TEXT = "code worker smoke ok"
 WORKFLOW_PROMPT = "Use workflow to compute the packaged worker smoke value without agents."
 WORKFLOW_WORKER_TEXT = "workflow worker smoke ok"
+PERSISTENT_TOOLS_PROMPT = "Exercise the packaged persistent Bash and string-replacement editor."
+PERSISTENT_TOOLS_TEXT = "persistent tools smoke ok"
+PERSISTENT_EDITOR_PATH_PREFIX = "Editor path: "
+PERSISTENT_BASH_COMMAND = (
+    "counter=$(( ${counter:-0} + 1 )); export counter; "
+    "printf 'COUNT=%s CWD=%s\\n' \"$counter\" \"$PWD\"; "
+    "if [ \"$counter\" -eq 1 ]; then cd /tmp; fi"
+)
 SNAPSHOT_PROMPT = "Run the advanced packaged-runtime snapshot scenario."
 SNAPSHOT_SESSION_ID = "advanced-executable"
 SNAPSHOT_DIRECT_CHILD_PROMPT = "Reply with exactly DIRECT_CHILD_OK and nothing else."
@@ -64,6 +72,9 @@ CUSTOM_CORDIS = """\
   name: '@deepseek-ai/dsh-agent-spine-demo'
   config:
     workspaceContext: false
+    skills:
+      enabled: false
+    toolBash: false
     tools:
       mode: both
 - id: sessions
@@ -71,10 +82,6 @@ CUSTOM_CORDIS = """\
   config:
     root: !!js process.env.DSH_SESSION_ROOT
     compression: 'none'
-- id: bash
-  name: '@deepseek-ai/dsh-bash-local'
-  config:
-    cwd: !!js process.env.DSH_CWD
 - id: code-runtime
   name: '@deepseek-ai/dsh-code-runtime-worker'
 - id: subagents
@@ -96,6 +103,49 @@ CUSTOM_CORDIS = """\
 - id: cordis-tool
   name: '@deepseek-ai/dsh-tool-cordis'
 """
+PERSISTENT_TOOLS_CORDIS = """\
+- id: jsonrpc
+  name: '@deepseek-ai/dsh-jsonrpc'
+- id: llm
+  name: '@deepseek-ai/dsh-llm-deepseek'
+  config:
+    apiKey: !!js process.env.DEEPSEEK_API_KEY
+    baseURL: !!js process.env.DEEPSEEK_BASE_URL
+- id: sandbox
+  name: '@deepseek-ai/dsh-sandbox-local'
+- id: sandbox-policy
+  name: '@deepseek-ai/dsh-sandbox-policy'
+  config:
+    mode: danger-full-access
+    workspaceRoot: !!js process.env.DSH_CWD
+- id: pty
+  name: '@deepseek-ai/dsh-pty'
+- id: pty-local
+  name: '@deepseek-ai/dsh-pty-local'
+- id: fs
+  name: '@deepseek-ai/dsh-fs-local'
+  config:
+    cwd: !!js process.env.DSH_CWD
+- id: agent-core
+  name: '@deepseek-ai/dsh-agent-spine-demo'
+  config:
+    includeHarnessIdentity: false
+    persona: 'You are a helpful software engineer assistant.'
+    workspaceContext: false
+    skills:
+      enabled: false
+    toolBash: false
+    toolTasks: false
+- id: sessions
+  name: '@deepseek-ai/dsh-session-persistence-jsonl'
+  config:
+    root: !!js process.env.DSH_SESSION_ROOT
+    compression: 'none'
+- id: persistent-bash
+  name: '@deepseek-ai/dsh-tool-bash-persistent'
+- id: str-replace-editor
+  name: '@deepseek-ai/dsh-tool-str-replace-editor'
+"""
 
 
 class MockModelHandler(BaseHTTPRequestHandler):
@@ -132,6 +182,9 @@ def completion_chunks(body: dict[str, object]) -> list[dict[str, object]]:
     if latest.get("role") == "tool":
         call_id, tool_name = latest_tool_call(messages)
         tool_text = message_text(latest.get("content"))
+        persistent = persistent_tool_followup(body, call_id, tool_name, tool_text)
+        if persistent is not None:
+            return persistent
         advanced = advanced_tool_followup(body, call_id, tool_name, tool_text)
         if advanced is not None:
             return advanced
@@ -144,6 +197,15 @@ def completion_chunks(body: dict[str, object]) -> list[dict[str, object]]:
         raise AssertionError(f"unexpected tool follow-up: {tool_name}")
 
     prompt = message_text(latest.get("content"))
+    if prompt.startswith(f"{PERSISTENT_TOOLS_PROMPT}\n{PERSISTENT_EDITOR_PATH_PREFIX}"):
+        names = advertised_tool_names(body)
+        if names != {"bash", "str_replace_editor"}:
+            raise AssertionError(f"persistent tools smoke advertised unexpected tools: {names}")
+        return tool_call_chunks(
+            "persistent-bash-1",
+            "bash",
+            {"command": PERSISTENT_BASH_COMMAND},
+        )
     if prompt == SNAPSHOT_DIRECT_CHILD_PROMPT:
         return text_chunks("DIRECT_CHILD_OK")
     if prompt == SNAPSHOT_WORKFLOW_CHILD_PROMPT:
@@ -178,6 +240,57 @@ def completion_chunks(body: dict[str, object]) -> list[dict[str, object]]:
     return text_chunks(EXPECTED_TEXT)
 
 
+def persistent_tool_followup(
+    body: dict[str, object],
+    call_id: str,
+    tool_name: str,
+    tool_text: str,
+) -> list[dict[str, object]] | None:
+    """Verify packaged PTY persistence, then invoke the packaged editor."""
+    if not call_id.startswith("persistent-"):
+        return None
+    if call_id == "persistent-bash-1" and tool_name == "bash":
+        if "COUNT=1" not in tool_text:
+            raise AssertionError(f"first persistent bash call lost its output: {tool_text}")
+        return tool_call_chunks(
+            "persistent-bash-2",
+            "bash",
+            {"command": PERSISTENT_BASH_COMMAND},
+        )
+    if call_id == "persistent-bash-2" and tool_name == "bash":
+        if "COUNT=2 CWD=/tmp" not in tool_text:
+            raise AssertionError(f"persistent bash did not retain state: {tool_text}")
+        messages = body.get("messages")
+        if not isinstance(messages, list):
+            raise AssertionError("persistent editor smoke request has no messages")
+        editor_path = next(
+            (
+                text.split(PERSISTENT_EDITOR_PATH_PREFIX, 1)[1].strip()
+                for message in messages
+                if isinstance(message, dict) and message.get("role") == "user"
+                for text in [message_text(message.get("content"))]
+                if PERSISTENT_EDITOR_PATH_PREFIX in text
+            ),
+            None,
+        )
+        if editor_path is None:
+            raise AssertionError("persistent editor smoke prompt has no editor path")
+        return tool_call_chunks(
+            "persistent-editor",
+            "str_replace_editor",
+            {
+                "command": "create",
+                "path": editor_path,
+                "file_text": "created by packaged editor\n",
+            },
+        )
+    if call_id == "persistent-editor" and tool_name == "str_replace_editor":
+        if "New file created successfully" not in tool_text:
+            raise AssertionError(f"packaged editor did not create its file: {tool_text}")
+        return text_chunks(PERSISTENT_TOOLS_TEXT)
+    raise AssertionError(f"unexpected persistent-tools follow-up: {call_id} {tool_name}: {tool_text}")
+
+
 def advanced_tool_followup(
     body: dict[str, object],
     call_id: str,
@@ -357,14 +470,14 @@ def main() -> None:
     parser = argparse.ArgumentParser(description=__doc__)
     parser.add_argument(
         "--scenario",
-        choices=("all", "sdk-default", "sdk-custom", "sdk-snapshot", "direct"),
+        choices=("all", "sdk-default", "sdk-custom", "sdk-persistent", "sdk-snapshot", "direct"),
         default="all",
     )
     parser.add_argument("--exe", type=Path)
     parser.add_argument("--update-snapshots", action="store_true")
     args = parser.parse_args()
-    if args.scenario in {"all", "sdk-custom", "sdk-snapshot", "direct"} and args.exe is None:
-        parser.error("--exe is required for custom, snapshot, and direct scenarios")
+    if args.scenario in {"all", "sdk-custom", "sdk-persistent", "sdk-snapshot", "direct"} and args.exe is None:
+        parser.error("--exe is required for custom, persistent, snapshot, and direct scenarios")
     if args.update_snapshots and args.scenario not in {"all", "sdk-snapshot"}:
         parser.error("--update-snapshots requires --scenario sdk-snapshot or all")
     if args.exe is not None and not args.exe.is_file():
@@ -376,6 +489,9 @@ def main() -> None:
         if args.scenario in {"all", "sdk-custom"}:
             assert args.exe is not None
             smoke_sdk_custom(model.url, args.exe.resolve())
+        if args.scenario in {"all", "sdk-persistent"}:
+            assert args.exe is not None
+            smoke_sdk_persistent_tools(model.url, args.exe.resolve())
         if args.scenario in {"all", "sdk-snapshot"}:
             assert args.exe is not None
             smoke_sdk_snapshot(model.url, args.exe.resolve(), args.update_snapshots)
@@ -439,6 +555,39 @@ def smoke_sdk_custom(base_url: str, executable: Path) -> None:
         assert_session_log(sessions, root, EXPECTED_TEXT, CODE_WORKER_TEXT, WORKFLOW_WORKER_TEXT)
 
 
+def smoke_sdk_persistent_tools(base_url: str, executable: Path) -> None:
+    """Exercise native PTY state and the editor through the packaged executable."""
+    from deepseek_harness import DeepSeekHarness
+
+    with tempfile.TemporaryDirectory(prefix="dsh-sdk-persistent-tools-") as temporary:
+        root = Path(temporary).resolve()
+        editor_path = root / "created.txt"
+        prompt = f"{PERSISTENT_TOOLS_PROMPT}\n{PERSISTENT_EDITOR_PATH_PREFIX}{editor_path}"
+        sessions = root / "sessions"
+        cordis = root / "cordis.yml"
+        cordis.write_text(PERSISTENT_TOOLS_CORDIS)
+        with DeepSeekHarness(
+            provider="deepseek",
+            model="smoke-model",
+            cwd=str(root),
+            session_root=str(sessions),
+            cordis=str(cordis),
+            runtime_bin=str(executable),
+            api_key="sk-keyless-smoke",
+            base_url=base_url,
+            request_timeout_seconds=60,
+        ) as harness:
+            result = harness.run(prompt, session_id="persistent-tools-smoke")
+
+        assert result.status == "ok", result
+        event_text = json.dumps(result.events)
+        if PERSISTENT_TOOLS_TEXT not in event_text:
+            raise AssertionError(f"packaged tools run emitted no final response: {result.events}")
+        if editor_path.read_text() != "created by packaged editor\n":
+            raise AssertionError(f"packaged editor wrote unexpected content: {editor_path.read_text()!r}")
+        assert_session_log(sessions, root, PERSISTENT_TOOLS_TEXT, "COUNT=1", "COUNT=2 CWD=/tmp")
+
+
 def smoke_sdk_snapshot(base_url: str, executable: Path, update_snapshots: bool) -> None:
     """Drive and compare the advanced SDK/executable behavioral snapshot."""
     from deepseek_harness import DeepSeekHarness
@@ -724,6 +873,8 @@ def normalize_snapshot_value(
         normalized["createdAt"] = 0
     if "seq" in normalized and "time" in normalized:
         normalized["time"] = 0
+    if isinstance(normalized.get("id"), str) and normalized.get("role") in ("assistant", "user"):
+        normalized["id"] = "{{messageId}}"
     scrub_snapshot_header(normalized)
     return normalized
 

scripts/snapshots/python-sdk-single-exe/advanced/session.1.jsonl

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scripts/snapshots/python-sdk-single-exe/advanced/session.2.jsonl

@@ -1,14 +1,14 @@
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scripts/snapshots/python-sdk-single-exe/advanced/session.jsonl

@@ -1,30 +1,30 @@
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+{"type":"tool/result","seq":55,"time":0,"data":{"turn":1,"step":5,"message":{"source":{"kind":"tool","callId":"advanced-unmount"},"content":[{"type":"tool-result","toolCallId":"advanced-unmount","content":[{"type":"text","text":"Temporary Plugin dyn-1 was unmounted and removed."}],"isError":false}],"role":"user","id":"{{messageId}}"}},"sourceEventSeqs":[54],"surfaceOp":"append"}
 {"type":"step/end","seq":56,"time":0,"data":{"turn":1,"step":5}}
 {"type":"step/start","seq":57,"time":0,"data":{"turn":1,"step":6}}
-{"type":"request/header","seq":58,"time":0,"data":{"header":{"config":{"provider":"deepseek","model":"smoke-model","reasoningEffort":"high"},"system":"{{system}}","tools":["bash","cordis_inspect","cordis_mount","cordis_unmount","run_code","skill","subagent","task_kill","task_list","task_output","workflow"],"messagePrefix":["{{messagePrefix}}"]},"reason":"change"}}
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 {"type":"assistant/chunk","seq":60,"time":0,"data":{"turn":1,"step":6,"chunk":{"type":"text-delta","index":0,"text":"ADVANCED_EXECUTABLE_OK"}}}
 {"type":"assistant/chunk","seq":61,"time":0,"data":{"turn":1,"step":6,"chunk":{"type":"block-end","index":0,"block":{"type":"text","text":"ADVANCED_EXECUTABLE_OK"}}}}
 {"type":"assistant/chunk","seq":62,"time":0,"data":{"turn":1,"step":6,"chunk":{"type":"usage","usage":{"inputTokens":3,"outputTokens":3}}}}
 {"type":"assistant/chunk","seq":63,"time":0,"data":{"turn":1,"step":6,"chunk":{"type":"finish","reason":{"kind":"stop"}}}}
-{"type":"assistant/message","seq":64,"time":0,"data":{"turn":1,"step":6,"content":[{"type":"text","text":"ADVANCED_EXECUTABLE_OK"}],"provenance":{"provider":"deepseek","model":"smoke-model"},"usage":{"inputTokens":3,"outputTokens":3}},"sourceEventSeqs":[59,60,61,62,63],"surfaceOp":"append"}
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tsconfig.host.json

@@ -112,6 +112,7 @@
     { "path": "./packages/bash/bash" },
     { "path": "./packages/pty/pty" },
     { "path": "./packages/pty/pty-local" },
+    { "path": "./packages/pty/tool-bash-persistent" },
     { "path": "./packages/pty/tool-pty" },
     { "path": "./packages/code-runtime/code-runtime" },
     { "path": "./packages/code-runtime/code-runtime-worker" },
@@ -129,6 +130,7 @@
     { "path": "./packages/fs/fs-sandbox" },
     { "path": "./packages/fs/tool-fs" },
     { "path": "./packages/fs/tool-fs-search" },
+    { "path": "./packages/fs/tool-str-replace-editor" },
     { "path": "./packages/compact/compact" },
     { "path": "./packages/compact/compact-basic" },
     { "path": "./packages/compact/compact-tool-result-prune" },