subagent: inherit parent sandbox/approval overrides in in-process children

Per-session policy overrides (sandbox/mode, approval/policy) never crossed
the delegation boundary: a spawn child of a read-only-switched parent ran
under the wider deployment default, and a fork child missed any switch made
after its seed boundary — delegation was a bypass channel for a user's
tightening.

The in-process driver now snapshots the delegating parent's override chain
and stamps it onto the child through the canonical write paths
(SandboxPolicyService.inheritOverride / ApprovalService.inheritOverride),
anchored inside the child's first turn via a one-shot agent/prompt-submit
listener: turn-enclosed (durable), ahead of the first request (an inherited
'never' reaches the child's first system prompt), and positioned after any
stale fork-seed switch so the ordinary last-event-wins fold resolves it.
Only overrides are copied — an unswitched parent stamps nothing and the
child follows the live deployment default; both services are consumed
opportunistically, so compositions without them delegate unchanged. Nesting
composes by construction (each stamp folds the already-stamped parent log).

Evidence: inheritance.spec.ts drives scripted-model children into the real
dsh-fs-sandbox fence through the real write tool (disk-state + denial-marker
assertions; spawn, stale-seed fork, grandchild, escalation fail-closed, and
no-stamp guards), inheritOverride contract tests in both service suites, and
the recorded subagent-sandbox-inheritance ACP snapshot (read-only preset →
delegate → child denied, replayed keylessly).

See .agents/notes/implemented/feature/2026-07-25-subagent-policy-inheritance.md.

.agents/notes/implemented/feature/2026-07-06-approval-seam.md

@@ -121,7 +121,7 @@ Costs and accepted limits:
 - **Who decides whether a call asks in the first place?** Policy producers: a hook returning `permissionDecision: ask`, any `tools/pre-execute` listener, or the sandbox escalation gate. The seam and the bridge only route and answer; neither injects its own judgment about what deserves a prompt.
 - **What happens when the user dismisses the prompt, or the turn aborts mid-ask?** Dismissal maps to `cancelled` with its own deny text. An already-aborted signal settles `cancelled` without dispatching; an abort during the ask discards the late answer. When both audit appends commit, either path records one pair, never two.
 - **What if the client answers with an option the harness never offered?** Any selection other than the offered `allow_once` maps to `rejected` — an unknown optionId from a non-conforming client can never grant.
-- **How do subagents' approvals route?** An agent no answerer owns delegates through the whole waterfall and fails closed — in-process subagents are deliberately unanswerable. `subagent-acp`'s child-side auto-answer is separate; routing a child's asks to the parent's editor is deferred (§ Deferred).
+- **How do subagents' approvals route?** An agent no answerer owns delegates through the whole waterfall and fails closed — in-process subagents are deliberately unanswerable. The session POLICY does cross the boundary: a `'never'` parent's children inherit `'never'` via a stamped override ([the subagent policy-inheritance Agent Note](2026-07-25-subagent-policy-inheritance.md)), so they are told up front instead of asking into the empty waterfall. `subagent-acp`'s child-side auto-answer is separate; routing a child's asks to the parent's editor is deferred (§ Deferred).
 - **What does `policy: 'never'` actually change at runtime?** The service resolves every ask for that session to `rejected` before dispatching any answerer (in-service, so no registration order can bypass it); the system prompt states the policy; switches are narrated at boundaries; each successful auto-rejection records the audit pair.
 - **What happens across a hot reload, or when the UI plugin unloads mid-session?** Answerers dispose with their owning fiber, so the next ask degrades to `unavailable` instead of hanging on a dead channel; remounting re-registers the answerer with no catch-up state.
 - **Where does the user see what they are approving?** On the tool call itself: the prompt attaches to the already-streamed call via `callId` — arguments included — and adds the asker's human-readable `reason`; the request carries no argument copy of its own.

.agents/notes/implemented/feature/2026-07-06-sandbox.md

@@ -90,7 +90,7 @@ Left open: what a durable grant's scope identity is beyond the sandbox mode —
 effective(session) = findLast(the session's own knob events)?.value ?? the composition-config default
 ```
 
-The default is composition config (`cordis.yml`) — operator-owned, process-wide. A runtime switch is a SESSION-SCOPED override recorded as one log-only event in that session's own log. Restart immunity (resuming a session replays its log, so overrides come back with zero catch-up machinery) and multi-session isolation (one editor tab's `workspace-write` cannot disturb another's `read-only`) both fall out by construction, and no external config store exists anywhere.
+The default is composition config (`cordis.yml`) — operator-owned, process-wide. A runtime switch is a SESSION-SCOPED override recorded as one log-only event in that session's own log. Restart immunity (resuming a session replays its log, so overrides come back with zero catch-up machinery) and multi-session isolation (one editor tab's `workspace-write` cannot disturb another's `read-only`) both fall out by construction, and no external config store exists anywhere. Isolation does not make delegation an escape hatch: the in-process subagent driver stamps a delegating parent's effective override onto each child session inside the child's first turn, so a tightened parent binds spawn children, fork children, and grandchildren ([the subagent policy-inheritance Agent Note](2026-07-25-subagent-policy-inheritance.md)).
 
 **One event per knob, owned by its domain** — the merge-extensible `SessionEventMap` idiom every existing event family already follows (`approval/*` in `dsh-user-approval`, `hook/*` in the hooks packages):
 

.agents/notes/implemented/feature/2026-07-25-subagent-policy-inheritance.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
+2026-07-25-subagent-policy-inheritance.md: bc5eb5b17ce34872db50b4cf848f6a1784ede0fc
+2026-07-25-subagent-policy-inheritance.zh.md: 3498b1b01987c44156b922fe0dcdd6223495fed6

.agents/notes/implemented/feature/2026-07-25-subagent-policy-inheritance.md

@@ -0,0 +1,37 @@
+# Agent Note: In-process subagent policy inheritance — the child starts under the parent's sandbox and approval overrides
+
+Status: implemented
+
+English | [中文](2026-07-25-subagent-policy-inheritance.zh.md)
+
+## Problem
+
+Session policy overrides are per-session log folds: the effective sandbox mode is `fold(session's sandbox/mode events) ?? deployment default` ([the sandbox Agent Note](2026-07-06-sandbox.md)), and the approval policy folds `approval/policy` the same way. In-process subagent children get a NEW session, so no override crossed the delegation boundary: a spawn child of a `read-only`-switched parent ran under the (possibly wider) deployment default — delegation was a bypass channel for a user's tightening — and a fork child inherited only whatever switch happened to sit inside its completed-turn seed, missing exactly the most common timing (the user switches while the agent is idle, so the switch lands after the last `turn/end` and outside the seed). A `'never'` (headless/CI) approval parent likewise minted children that fell back to a prompting default. The escalation hint a denied child sees ("the approval prompt asks the user") also promised a prompt no answerer would ever deliver.
+
+## Decision
+
+The shared in-process driver (`startInProcessRun` in `packages/subagent/subagent-inprocess`) snapshots the parent's policy overrides at delegation and stamps them onto the child as ordinary log events inside the child's FIRST turn:
+
+- **Read at creation, write at first `agent/prompt-submit`.** The driver installs a one-shot child-scoped `agent/prompt-submit` listener during the creation transaction's setup window. Prompt-submit runs after `turn/start` and before prompt assembly, so the stamped events are turn-enclosed (durable — a bare between-turn event is crash-tail garbage on reload) and visible to the child's very first request (an inherited `'never'` reaches the child's first system prompt). This is the same anchoring the ACP bridge uses for idle preset switches.
+- **Only the override chain is copied, through the canonical write paths.** `SandboxPolicyService.inheritOverride(parent, child)` and `ApprovalService.inheritOverride(parent, child)` each fold the parent's FULL live log (not the fork seed), append via `setSandboxMode`/`setApprovalPolicy` only when the parent has an override the child does not already fold to, and never copy the deployment default — an unswitched parent stamps nothing, so a resumed child keeps following the LIVE default. The driver consumes both services opportunistically (`ctx.get`, type-only imports): compositions without them delegate policy-free, unchanged.
+- **Fork stale-seed precedence falls out of log order.** The stamped event lands after any switch the seed carried, so the existing last-event-wins fold resolves the child's mode with no new precedence machinery; an equal seed-carried override is deduplicated instead of re-stamped.
+- **Nesting composes by construction.** A grandchild's stamp folds its parent-the-child's log, which already contains the child's stamped (or self-switched) override — the chain collapses one level per delegation, at any depth. One-shot `allowed-once` escalation grants never enter any log, so they can never leak down the chain.
+
+### What a blocked child experiences
+
+A confined child that hits the wall gets the ordinary denial marker; an escalation retry resolves through the real approval waterfall, where no answerer owns an in-process child, to the distinct fail-closed reason (`no approval channel is available`). The recovery path is reporting the denial upward: the parent — owned by an editor — escalates in its own session or re-delegates after the user widens the mode. An inherited `'never'` skips even that wasted retry: the child's first system prompt already says not to request escalation.
+
+## Alternatives considered
+
+- **A `sandboxMode`/`approvalPolicy` baseline in `SessionHeader` meta (the `delegationDepth` precedent)** — rejected: it survives the one corner the event approach loses (a child hard-killed before its first `turn/end` and then resumed loses the stamp), but that child has completed nothing and has no resume value, while the header field costs a session-format extension, a durable-boundary validation path, seed-slicing precedence logic in every fold consumer (`resolve()`, pty-local, permission display), and a second home for policy state. The event approach changes no fold, no format, and no consumer.
+- **Stamping at child creation (outside any turn)** — rejected: the persistence contract commits at turn boundaries, so a pre-turn bare event is truncated as a torn tail on reload; the session invariant suite fails such an append outright.
+- **Live resolution walking `parentSession` at each call** — rejected: it breaks the "two sessions never see each other's state" isolation invariant, requires the parent session to stay loaded for the child's lifetime, and makes a mid-run parent switch retroactively change a running child. Snapshot-at-delegation is the semantic: the child keeps the policy it was handed; cancel-and-respawn picks up a tightening.
+- **Forcing `approvalPolicy: 'never'` onto every in-process child** — rejected: true today (no answerer owns them) but it forecloses a future child-capable answerer silently and muddies inheritance semantics; inheriting only the parent's override keeps the fail-closed outcome with honest per-request reasons.
+- **Routing a child's approval asks to the root session's editor** — deferred, unchanged from [the approval-seam Agent Note](2026-07-06-approval-seam.md): the ACP prompt must attach to a streamed tool call, a background child's originating call has already returned, and the bridge would need parent-chain ownership plus the spawning `callId` on the start request. Recorded here so the obstacles are not re-derived.
+
+## Consequences
+
+- A parent's tightened sandbox mode and `'never'` approval stance now bind spawn children, fork children (regardless of seed timing), and grandchildren; the delegation bypass is closed at every depth. Pinned by the real-wall suite in `packages/subagent/subagent-inprocess/tests/inheritance.spec.ts` (a scripted-model child hitting the real `dsh-fs-sandbox` fence through the real `write` tool, asserted on disk state and denial markers) and the `inheritOverride` contract tests in the two service suites.
+- The stamped override is the child's own durable record: resume replays it like any switch, and the child may later be switched independently without the driver re-stamping over it (one-shot listener + fold dedup).
+- Accepted limits: a parent switch made while a child is already running does not propagate (snapshot semantics); a child hard-killed before its first `turn/end` loses the stamp on resume (worthless-resume corner, recorded above); out-of-process backends (`subagent-acp`, subprocess children) inherit nothing here — their policy belongs to the child harness's own deployment, the sandbox Agent Note's deferred phase.
+- `dsh-subagent-inprocess` now declares `dsh-sandbox-policy` and `dsh-user-approval` as peers for the `ctx.get` typing; both remain runtime-optional.

.agents/notes/implemented/feature/2026-07-25-subagent-policy-inheritance.zh.md

@@ -0,0 +1,37 @@
+# Agent Note: 进程内 subagent 策略继承——子 agent 在父级的沙箱与审批覆盖项下启动
+
+Status: implemented
+
+[English](2026-07-25-subagent-policy-inheritance.md) | 中文
+
+## 问题
+
+会话策略覆盖项是按会话的日志折叠：生效沙箱模式等于 `fold(session's sandbox/mode events) ?? deployment default`（[沙箱 Agent Note](2026-07-06-sandbox.md)），审批策略以同样的方式折叠 `approval/policy`。进程内 subagent 的子 agent（智能体）拿到的是一个全新会话，因此没有任何覆盖项能跨过委派边界：父 agent 已切换到 `read-only` 时，其 spawn 子 agent 却运行在（可能更宽的）部署默认值之下，委派成了绕开用户收紧的旁路通道；fork 子 agent 只能继承恰好落在其已完成轮次种子内的切换，而恰恰漏掉最常见的时机（用户在 agent 空闲时切换，切换落在最后一个 `turn/end` 之后、种子之外）。审批策略为 `'never'`（无头／CI 场景）的父 agent，其创建出的子 agent 同样回退到了会向用户弹出提示的默认策略。被拒的子 agent 看到的升级提示文案（「审批提示会询问用户」）还承诺了一个永远不会有应答器送达的提示。
+
+## 决策
+
+共享的进程内驱动器（`packages/subagent/subagent-inprocess` 中的 `startInProcessRun`）在委派时快照父级的策略覆盖项，并在子 agent 的第一个轮次内把它们作为普通日志事件盖章写入子会话：
+
+- **创建时读取，首个 `agent/prompt-submit` 时写入。**驱动器在创建事务的 setup 窗口内安装一个一次性的、限定子 agent 作用域的 `agent/prompt-submit` 监听器。prompt-submit 阶段在 `turn/start` 之后、提示词组装之前运行，因此盖章事件被包围在轮次内（具备持久性：轮次之间的裸事件在重新加载时只是崩溃残留的尾部垃圾），并且对子 agent 的第一次请求可见（继承来的 `'never'` 能进入子 agent 的第一份系统提示词）。ACP（Agent Client Protocol）桥接器处理空闲时预设切换所用的正是同一种锚定方式。
+- **只复制覆盖链，且全部走规范写入路径。**`SandboxPolicyService.inheritOverride(parent, child)` 与 `ApprovalService.inheritOverride(parent, child)` 各自折叠父级的完整实时日志（而非 fork 种子），只在父级持有子 agent 尚未折叠出的覆盖项时才通过 `setSandboxMode`/`setApprovalPolicy` 追加，并且从不复制部署默认值：未切换过的父级不盖任何章，因此恢复后的子 agent 继续跟随实时默认值。驱动器以可选方式消费这两个服务（`ctx.get`，仅类型导入）：未挂载它们的组合照旧进行无策略委派，行为不变。
+- **fork 陈旧种子的优先级由日志顺序自然得出。**盖章事件落在种子携带的任何切换之后，因此既有的「最后一个事件生效」折叠即可解析出子 agent 的模式，无需新增优先级机制；种子已携带相同覆盖项时会去重，而不会重复盖章。
+- **嵌套按构造即可组合。**孙代 agent 盖章时折叠的是其父级（即上一层的子 agent）的日志，而该日志已经包含这个子 agent 被盖章（或自行切换）的覆盖项：这条链在每层委派处收拢一级，任意深度均成立。一次性的 `allowed-once` 升级授权从不进入任何日志，因此永远不可能沿链向下泄漏。
+
+### 被拦住的子 agent 会经历什么
+
+受限子 agent 撞上围栏时得到的是普通拒绝标记；升级重试会经过真实的审批 waterfall（瀑布式事件）解析，而其中没有任何应答器认领进程内子 agent，最终落到那个独立的 fail-closed 原因（`no approval channel is available`）。恢复路径是把拒绝向上汇报：父 agent 由编辑器持有，可以在自己的会话里发起升级，或在用户放宽模式后重新委派。继承来的 `'never'` 连这次注定无效的重试都会省去：子 agent 的第一份系统提示词已经写明不要请求升级。
+
+## 考虑过的替代方案
+
+- **在 `SessionHeader` 的 meta 中放 `sandboxMode`/`approvalPolicy` 基线（沿用 `delegationDepth` 先例）**：不予采纳。它确实能扛住事件方案唯一丢失的边角场景（子 agent 在第一个 `turn/end` 前被强制杀死、随后又被恢复时会丢失盖章），但那样的子 agent 尚未完成任何工作，恢复毫无价值；而该会话头字段的代价是一次会话格式扩展、一条持久边界上的校验路径、每个折叠消费方（`resolve()`、pty-local、权限展示）里的种子切片优先级逻辑，以及策略状态的第二个存放处。事件方案不改动任何折叠、任何格式、任何消费方。
+- **在子 agent 创建时（任何轮次之外）盖章**：不予采纳。持久化契约在轮次边界提交，因此轮次开始前的裸事件在重新加载时会被当作撕裂尾部截断；会话不变量测试套件会直接判这种追加失败。
+- **每次调用时沿 `parentSession` 实时解析**：不予采纳。这会打破「两个会话永远看不到彼此状态」的隔离不变量，要求父会话在子 agent 的整个生命周期内保持加载，还会让父级在子 agent 运行途中做的切换追溯性地改变一个正在运行的子 agent。委派时快照才是本设计的语义：子 agent 保持它被交付时的策略；取消后重新 spawn 即可拿到收紧后的策略。
+- **给每个进程内子 agent 强制设置 `approvalPolicy: 'never'`**：不予采纳。这在今天是事实（没有应答器认领它们），但它会静默排除未来能够服务子 agent 的应答器，并搅浑继承语义；只继承父级的覆盖项既保住 fail-closed 结果，又让每次请求的拒绝原因保持诚实。
+- **把子 agent 的审批请求路由给根会话的编辑器**：继续延后，结论与[审批 seam Agent Note](2026-07-06-approval-seam.md) 相比没有变化：ACP 提示必须附着在一个流式工具调用上，后台子 agent 的发起调用早已返回，而且桥接器还需要父链所有权以及 start 请求上携带发起 spawn 的 `callId`。在此记录，以免这些障碍被再次推导。
+
+## 后果
+
+- 父级收紧后的沙箱模式与 `'never'` 审批立场现在会约束 spawn 子 agent、fork 子 agent（无论种子时机如何）与孙代 agent；委派旁路在每一层深度都已封死。该行为由 `packages/subagent/subagent-inprocess/tests/inheritance.spec.ts` 中的真实围栏测试套件钉住（脚本化模型驱动的子 agent 通过真实 `write` 工具撞上真实的 `dsh-fs-sandbox` 围栏，按落盘状态与拒绝标记断言），并由两个服务各自测试套件中的 `inheritOverride` 契约测试钉住。
+- 盖章写入的覆盖项是子 agent 自己的持久记录：恢复时它像任何一次切换一样被回放；子 agent 之后仍可被独立切换，驱动器不会重新盖章覆盖它（一次性监听器加折叠去重）。
+- 已接受的限制：子 agent 已在运行时父级再做的切换不会传播（快照语义）；子 agent 在第一个 `turn/end` 前被强制杀死后，恢复时会丢失盖章（恢复无价值的边角场景，上文已记录）；进程外后端（`subagent-acp`、子进程形态的子 agent）在这里不继承任何内容：它们的策略归子 harness 自身的部署所有，属于沙箱 Agent Note 中延后的阶段。
+- `dsh-subagent-inprocess` 现在将 `dsh-sandbox-policy` 与 `dsh-user-approval` 声明为对等依赖（peer dependency），以支撑 `ctx.get` 的类型；两者在运行时仍然可选。

docs/cordis-catalog/services.md

@@ -242,9 +242,23 @@ Approval service that applies session policy before answerers and logs every ask
  *   append commit point.
  */
 async request(req: ApprovalRequest): Promise<ApprovalOutcome>
+
+/**
+ * Stamp the parent's approval-policy OVERRIDE onto a child session through
+ * the canonical write path — the delegation-inheritance step: a `'never'`
+ * (headless/CI) parent must not mint children that fall back to a prompting
+ * default. Only the override chain is copied: an unswitched parent stamps
+ * nothing, so the child keeps following the LIVE configured default. A
+ * child whose log (e.g. a fork seed) already folds to the inherited policy
+ * is left untouched. Callers must append inside an open child turn — a bare
+ * between-turn event is crash-tail garbage on reload.
+ * @param parent - the delegating session whose effective override is read.
+ * @param child - the child session the override is appended to.
+ */
+inheritOverride(parent: Session, child: Session): void
 ```
 
-Types: [ApprovalOutcome](../core-data-structures/approval.md) · [ApprovalRequest](../core-data-structures/approval.md)
+Types: [ApprovalOutcome](../core-data-structures/approval.md) · [ApprovalRequest](../core-data-structures/approval.md) · [Session](../core-data-structures/session.md)
 
 Source: [`packages/ui/user-approval/src/index.ts:213`](../../packages/ui/user-approval/src/index.ts)
 
@@ -874,9 +888,23 @@ The sandbox-policy service (`ctx.sandboxPolicy`). Owns the deployment default mo
  * @returns the fully resolved per-call mode and absolute workspace root.
  */
 resolve(request: SandboxPolicyRequest = {}): SandboxExecutionPolicy
+
+/**
+ * Stamp the parent's sandbox-mode OVERRIDE onto a child session through the
+ * canonical write path — the delegation-inheritance step: a child agent runs
+ * under the policy its delegating parent was switched to, not under the
+ * (possibly wider) deployment default. Only the override chain is copied: an
+ * unswitched parent stamps nothing, so the child keeps following the LIVE
+ * deployment default. A child whose log (e.g. a fork seed) already folds to
+ * the inherited mode is left untouched. Callers must append inside an open
+ * child turn — a bare between-turn event is crash-tail garbage on reload.
+ * @param parent - the delegating session whose effective override is read.
+ * @param child - the child session the override is appended to.
+ */
+inheritOverride(parent: Session, child: Session): void
 ```
 
-Types: [SandboxExecutionPolicy](../core-data-structures/sandbox.md) · [SandboxPolicyRequest](../core-data-structures/sandbox.md)
+Types: [SandboxExecutionPolicy](../core-data-structures/sandbox.md) · [SandboxPolicyRequest](../core-data-structures/sandbox.md) · [Session](../core-data-structures/session.md)
 
 Source: [`packages/sandbox/sandbox-policy/src/index.ts:68`](../../packages/sandbox/sandbox-policy/src/index.ts)
 

docs/event-producer-consumer.md

@@ -14,7 +14,7 @@ This matrix shows which packages dispatch each harness-owned event and which pac
 | `agent/error` | `emit` | [`packages/core/agent/src/types.ts:365`](../packages/core/agent/src/types.ts) | [`agent-loop`](../packages/core/agent-loop) (`emit`) | [`goal-session`](../packages/goal/goal-session), `runtime`, [`tui`](../packages/ui/tui) |
 | `agent/post-step` | `serial` | [`packages/core/agent/src/types.ts:315`](../packages/core/agent/src/types.ts) | [`agent-loop`](../packages/core/agent-loop) (`serial`) | [`compact-basic`](../packages/compact/compact-basic), [`session-checkpoint-policy`](../packages/session-persistence/session-checkpoint-policy) |
 | `agent/pre-step` | `serial` | [`packages/core/agent/src/types.ts:246`](../packages/core/agent/src/types.ts) | [`agent-loop`](../packages/core/agent-loop) (`serial`) | [`time-context`](../packages/context/time-context), [`user-approval`](../packages/ui/user-approval) |
-| `agent/prompt-submit` | `waterfall` | [`packages/core/agent/src/types.ts:262`](../packages/core/agent/src/types.ts) | [`agent-loop`](../packages/core/agent-loop) (`waterfall`) | [`acp`](../packages/ui/acp), [`goal-session`](../packages/goal/goal-session), [`hooks-claude`](../packages/hooks/hooks-claude), [`hooks-codex`](../packages/hooks/hooks-codex), [`plan-mode`](../packages/plan/plan-mode), [`repeat-tool-guard`](../packages/guard/repeat-tool-guard) |
+| `agent/prompt-submit` | `waterfall` | [`packages/core/agent/src/types.ts:262`](../packages/core/agent/src/types.ts) | [`agent-loop`](../packages/core/agent-loop) (`waterfall`) | [`acp`](../packages/ui/acp), [`goal-session`](../packages/goal/goal-session), [`hooks-claude`](../packages/hooks/hooks-claude), [`hooks-codex`](../packages/hooks/hooks-codex), [`plan-mode`](../packages/plan/plan-mode), [`repeat-tool-guard`](../packages/guard/repeat-tool-guard), [`subagent-inprocess`](../packages/subagent/subagent-inprocess) |
 | `agent/queued` | `emit` | [`packages/core/agent/src/types.ts:207`](../packages/core/agent/src/types.ts) | [`agent-loop`](../packages/core/agent-loop) (`emit`) | [`goal-session`](../packages/goal/goal-session), [`tui`](../packages/ui/tui) |
 | `agent/request` | `waterfall` | [`packages/core/agent/src/types.ts:276`](../packages/core/agent/src/types.ts) | [`agent-loop`](../packages/core/agent-loop) (`waterfall`) | [`agent`](../packages/core/agent) |
 | `agent/request-error` | `waterfall` | [`packages/core/agent/src/types.ts:330`](../packages/core/agent/src/types.ts) | [`agent-loop`](../packages/core/agent-loop) (`waterfall`) | [`compact-basic`](../packages/compact/compact-basic), [`llm-retry`](../packages/llm/llm-retry), [`plan-mode`](../packages/plan/plan-mode) |

examples/acp-agent/subagent-inheritance.cordis.snapshot.yml

@@ -0,0 +1,65 @@
+# Keyless replay counterpart of subagent-inheritance.cordis.yml: the same
+# read-only preset and model pin, plus the standard replay swaps (disable the
+# key-requiring adapter, passthrough sandbox runner, insert llm-replay).
+# Patches do not compose across nested includes, so everything applies together
+# over the live tree.
+- id: base
+  name: '@cordisjs/plugin-include'
+  config:
+    path: ./cordis.yml
+    patches:
+      - id: llm-deepseek
+        name: '@deepseek-ai/dsh-llm-deepseek'
+        disabled: true
+      - id: sandbox
+        name: '@deepseek-ai/dsh-sandbox-local'
+        config:
+          runnerCommand:
+            - bash
+            - -c
+            - while [ "$1" != "--" ]; do shift; done; shift; exec "$@"
+            - passthrough-runner
+          runnerFailureSignatures:
+            - 'passthrough-runner: profile rejected'
+      - id: permission
+        name: '@deepseek-ai/dsh-permission'
+        config:
+          presets:
+            read-only:
+              sandbox: read-only
+              approval: ask
+              name: read-only
+              description: Read all files; every mutation is denied without a per-call approval.
+            workspace-write:
+              sandbox: workspace-write
+              approval: ask
+              name: workspace-write
+              description: Write inside the workspace and permitted temporary directories; wider retries require approval.
+            danger-full-access:
+              sandbox: danger-full-access
+              approval: never
+              name: danger-full-access
+              description: Full file access without approval prompts.
+      - id: acp-agent
+        name: '@deepseek-ai/dsh-acp-demo'
+        config:
+          provider: deepseek
+          model: deepseek-v4-flash
+          persistenceRoot: !!js process.env.DSH_SNAPSHOT_SESSIONS_ROOT ?? './.sessions'
+          persistenceCompression: none
+          workspaceContext:
+            maxBytes: 65536
+          persona: |
+            You are a coding assistant powered by the {{model}} model. Your working directory is {{cwd}}. Your bash tool runs under a file sandbox — a `[sandbox: file access denied …]` result is policy, not a command bug.
+
+            Verify your work by running the code or tests. Keep answers brief and factual.
+      - insert:
+          - id: llm-replay
+            name: '@deepseek-ai/dsh-llm-replay'
+            config:
+              providers:
+                - id: deepseek
+                  name: DeepSeek
+                  models:
+                    - id: deepseek-v4-flash
+                    - id: deepseek-v4-pro

examples/acp-agent/subagent-inheritance.cordis.yml

@@ -0,0 +1,44 @@
+# Subagent policy-inheritance snapshot overlay: add a read-only preset to the
+# default permission table so a scenario can tighten the parent session below
+# the snapshot composition's danger-full-access default before delegating — the
+# child's denial then proves the override crossed the delegation boundary. The
+# model is pinned to deepseek-v4-flash so this scenario's request headers stay
+# uniform with the rest of the recorded sandbox-class corpus. A config patch
+# replaces the whole target config, so base fields are restated verbatim.
+- id: base
+  name: '@cordisjs/plugin-include'
+  config:
+    path: ./cordis.yml
+    patches:
+      - id: permission
+        name: '@deepseek-ai/dsh-permission'
+        config:
+          presets:
+            read-only:
+              sandbox: read-only
+              approval: ask
+              name: read-only
+              description: Read all files; every mutation is denied without a per-call approval.
+            workspace-write:
+              sandbox: workspace-write
+              approval: ask
+              name: workspace-write
+              description: Write inside the workspace and permitted temporary directories; wider retries require approval.
+            danger-full-access:
+              sandbox: danger-full-access
+              approval: never
+              name: danger-full-access
+              description: Full file access without approval prompts.
+      - id: acp-agent
+        name: '@deepseek-ai/dsh-acp-demo'
+        config:
+          provider: deepseek
+          model: deepseek-v4-flash
+          persistenceRoot: !!js process.env.DSH_SNAPSHOT_SESSIONS_ROOT ?? './.sessions'
+          persistenceCompression: !!js "process.env.DSH_SNAPSHOT === undefined ? 'zstd' : 'none'"
+          workspaceContext:
+            maxBytes: 65536
+          persona: |
+            You are a coding assistant powered by the {{model}} model. Your working directory is {{cwd}}. Your bash tool runs under a file sandbox — a `[sandbox: file access denied …]` result is policy, not a command bug.
+
+            Verify your work by running the code or tests. Keep answers brief and factual.

examples/acp-agent/tests/acp.snapshot.ts

@@ -38,6 +38,7 @@ const PTY_CONFIG = fileURLToPath(new URL('../pty.cordis.yml', import.meta.url))
 const DEPTH_TWO_CONFIG = fileURLToPath(new URL('../depth-two.cordis.yml', import.meta.url))
 const PACKED_CHUNKS_CONFIG = fileURLToPath(new URL('../packed-chunks.cordis.yml', import.meta.url))
 const SESSION_SANDBOX_ROOT_CONFIG = fileURLToPath(new URL('../session-sandbox-root.cordis.yml', import.meta.url))
+const SUBAGENT_INHERITANCE_CONFIG = fileURLToPath(new URL('../subagent-inheritance.cordis.yml', import.meta.url))
 const LSP_CONFIG = fileURLToPath(new URL('./lsp.cordis.yml', import.meta.url))
 const SNAPSHOTS_DIR = join(dirname(fileURLToPath(import.meta.url)), 'snapshots')
 const PACKED_CHUNKS_SOURCE = 'hook-cc-pretool-deny'
@@ -241,6 +242,19 @@ const SCENARIOS: Scenario[] = [
   { name: 'escalation-approved', hasModelTurn: true, recorded: true, headerClass: 'sandbox' },
   { name: 'escalation-rejected', hasModelTurn: true, recorded: true, headerClass: 'sandbox' },
   { name: 'fs-escalation-approved', hasModelTurn: true, recorded: true, headerClass: 'sandbox' },
+  // Policy inheritance across delegation: the overlay adds a read-only preset,
+  // the script tightens the PARENT session to it, and the delegated child's
+  // real write is then denied by the fs fence — proving the parent's override
+  // crossed the delegation boundary instead of the child escaping to the
+  // composition default (the subagent policy-inheritance Agent Note).
+  {
+    name: 'subagent-sandbox-inheritance',
+    hasModelTurn: true,
+    recorded: true,
+    headerClass: 'subagent-inheritance',
+    pinsHeader: true,
+    configPath: SUBAGENT_INHERITANCE_CONFIG,
+  },
   // Unlike ordinary snapshots, this session cwd is outside the platform temp
   // roots that workspace-write always grants. The overlay points the
   // deployment fallback at /tmp, so a successful relative write proves the

examples/acp-agent/tests/snapshots/subagent-sandbox-inheritance/input.json

@@ -0,0 +1,19 @@
+{
+  "steps": [
+    {
+      "op": "initialize"
+    },
+    {
+      "op": "newSession"
+    },
+    {
+      "op": "setConfigOption",
+      "configId": "permission",
+      "value": "read-only"
+    },
+    {
+      "op": "prompt",
+      "text": "Use the subagent tool exactly once to delegate this subtask to a child agent: 'Use the write tool exactly once with file_path set to exactly the relative path inherited.txt (never an absolute path) and content escaped. If the write is denied, do not retry and do not request escalation; reply with the single word CHILD_DENIED and the exact denial marker line from the tool result. If it succeeds, reply with the single word CHILD_WROTE.' After the subagent returns, state in one short sentence whether the child was denied by the sandbox, quoting the denial marker if there is one, then reply with the single word PARENT_DONE and stop. Do not use the bash or write tools yourself and do not request escalation."
+    }
+  ]
+}

examples/acp-agent/tests/snapshots/subagent-sandbox-inheritance/session.1.jsonl

@@ -0,0 +1,238 @@
+{"type":"session","version":0,"id":"895486f2-ab5d-4271-8929-c39098e5cd67","createdAt":1784922514485,"cwd":"/var/folders/2g/b32ct0qn1d728l_v6tdkjytr0000gn/T/acp-snap-cwd-enaeOs","parentSession":"750b62f4-239a-4ba1-afee-bf078d4cc690","delegationDepth":1}
+{"type":"turn/start","seq":0,"time":1784922514485,"data":{"turn":1,"trigger":{"kind":"message","source":{"kind":"user"}}}}
+{"type":"sandbox/mode","seq":1,"time":1784922514486,"data":{"mode":"read-only"}}
+{"type":"approval/policy","seq":2,"time":1784922514486,"data":{"policy":"ask"}}
+{"type":"user/message","seq":3,"time":1784922514486,"data":{"content":[{"type":"text","text":"Use the write tool exactly once with file_path set to exactly the relative path inherited.txt (never an absolute path) and content escaped. If the write is denied, do not retry and do not request escalation; reply with the single word CHILD_DENIED and the exact denial marker line from the tool result. If it succeeds, reply with the single word CHILD_WROTE."}],"source":{"kind":"user"}},"surfaceOp":"append"}
+{"type":"session/title","seq":4,"time":1784922514486,"data":{"title":"Use the write tool exactly","messageSeqs":[3],"source":{"kind":"fallback"}}}
+{"type":"step/start","seq":5,"time":1784922514488,"data":{"turn":1,"step":1}}
+{"type":"request/header","seq":6,"time":1784922514488,"data":{"header":{"config":{"provider":"deepseek","model":"deepseek-v4-flash"},"system":"{{system}}","tools":"{{tools}}"},"reason":"initial"}}
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examples/acp-agent/tests/snapshots/subagent-sandbox-inheritance/stdout.expected.jsonl

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+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"ILD"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"_D"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"EN"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"IED"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" ["}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"sand"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"box"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":":"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" file"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" access"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" denied"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" under"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" read"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"-only"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" mode"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"]"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"\".\n\n"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"Now"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" I"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" need"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" to"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":":\n"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"1"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"."}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" State"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" in"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" one"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" short"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" sentence"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" whether"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" the"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" child"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" was"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" denied"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" by"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" the"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" sand"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"box"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":","}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" quoting"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" the"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" denial"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" marker"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"\n"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"2"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"."}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" Reply"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" with"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" \""}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"PAR"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"ENT"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"_D"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"ONE"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"\""}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_message_chunk","content":{"type":"text","text":"The"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_message_chunk","content":{"type":"text","text":" child"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_message_chunk","content":{"type":"text","text":" was"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_message_chunk","content":{"type":"text","text":" denied"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_message_chunk","content":{"type":"text","text":" by"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_message_chunk","content":{"type":"text","text":" the"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_message_chunk","content":{"type":"text","text":" sand"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_message_chunk","content":{"type":"text","text":"box"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_message_chunk","content":{"type":"text","text":" with"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_message_chunk","content":{"type":"text","text":" the"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_message_chunk","content":{"type":"text","text":" marker"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_message_chunk","content":{"type":"text","text":":"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_message_chunk","content":{"type":"text","text":" `"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_message_chunk","content":{"type":"text","text":"["}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_message_chunk","content":{"type":"text","text":"sand"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_message_chunk","content":{"type":"text","text":"box"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_message_chunk","content":{"type":"text","text":":"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_message_chunk","content":{"type":"text","text":" file"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_message_chunk","content":{"type":"text","text":" access"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_message_chunk","content":{"type":"text","text":" denied"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_message_chunk","content":{"type":"text","text":" under"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_message_chunk","content":{"type":"text","text":" read"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_message_chunk","content":{"type":"text","text":"-only"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_message_chunk","content":{"type":"text","text":" mode"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_message_chunk","content":{"type":"text","text":"]"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_message_chunk","content":{"type":"text","text":"`.\n\n"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_message_chunk","content":{"type":"text","text":"PAR"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_message_chunk","content":{"type":"text","text":"ENT"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_message_chunk","content":{"type":"text","text":"_D"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_message_chunk","content":{"type":"text","text":"ONE"}}}}
+{"jsonrpc":"2.0","id":4,"result":{"stopReason":"end_turn"}}

examples/acp-agent/tests/snapshots/subagent-sandbox-inheritance/system-prompt.expected.md

@@ -0,0 +1,24 @@
+You are an AI agent powered by the DeepSeek Harness SDK.
+
+You are a coding assistant powered by the deepseek-v4-flash model. Your working directory is {{cwd}}. Your bash tool runs under a file sandbox — a `[sandbox: file access denied …]` result is policy, not a command bug.
+
+Verify your work by running the code or tests. Keep answers brief and factual.
+
+
+Use the read tool — not shell commands like cat — to inspect text files. Results include line numbers. Use offset and limit to continue reading large files.
+
+Use the write tool to create files or completely replace file contents. Existing files are overwritten, so read an existing file first (the default fs-policy requires it) and prefer edit for targeted changes.
+
+Use the edit tool for targeted changes to existing UTF-8 text files. It replaces literal old_string with new_string; by default old_string must appear exactly once. If old_string appears multiple times, provide a more specific old_string or set replace_all to true. Read the file first (the default fs-policy requires it), unless you just created or edited it in this session.
+
+Check the [exit code: N] marker on every bash result; investigate failures before moving on.
+
+Track every background task id you start. You are notified in-session when a task finishes — do not busy-poll or sleep on one; keep working on independent steps and do not duplicate a running task's work. Before giving a final answer, collect every still-relevant task with task_output (set wait: true only when you are genuinely blocked on it), and task_kill tasks that stopped mattering.
+
+Use goal tools for one long-running completion objective in the current session. create_goal may infer goal intent from a direct human request in any language; do not create a goal for routine single-turn work. Call get_goal before update_goal and copy its exact goal_id and revision. After session resume or fork, an active goal is disarmed: when a human asks to continue or resume in any wording or language, use update_goal action resume to rearm it. Mark complete only when the objective is actually achieved. Mark blocked only after the same blocking condition persists for at least 3 consecutive goal rounds, and report that concrete condition in blocked_reason; difficulty, uncertainty, or useful remaining work is not blocked.
+
+<!-- dsh-user-approval-policy:ask -->
+
+Use the workflow tool ONLY when the user explicitly asks for a workflow or for large multi-agent orchestration: you write a JavaScript script (the tool description documents the exact format) that fans work out across many subagents with phases and structured results. For one or two delegations, prefer plain subagent calls.
+
+Use the ralph tool ONLY when the direct human explicitly asks for a Ralph loop or fresh-agent iterative execution. Each Ralph round starts a fresh child with no conversation seed and uses the shared workspace as durable memory. Completion and blockers are worker reports, not independent evaluation. Use same-session goal tools for ordinary long-running objectives, and plain subagents or workflows for bounded delegation and fan-out.

packages/cordis/tool-cordis/src/api-catalog.ts

@@ -150,6 +150,10 @@ export const SERVICE_API: readonly ServiceApiEntry[] = [
         signature: 'async request(req: ApprovalRequest): Promise<ApprovalOutcome>',
         jsDoc: '/**\n * Ask the composed answerers to decide one readonly same-process request.\n * The service borrows the request, agent, session, and live signal directly.\n * The request requires an open turn because the audit pair must be enclosed\n * by the durable log\'s commit/replay boundary; an idle ask rejects before\n * appending anything. The answerer phase always produces an outcome: an\n * aborted signal yields `\'cancelled\'`, a missing or throwing answerer yields\n * `\'unavailable\'` (fail closed), and a rogue non-vocabulary return value is\n * normalized to `\'unavailable\'`. A failure that prevents either audit append\n * from committing still rejects because returning an unlogged decision would\n * violate the pair. Session contains post-commit observer failures, so an\n * authoritative append cannot reject the request or suppress its matching\n * audit event.\n * @param req - the pending decision (agent, tool identity, reason, signal).\n * @returns the closed outcome; `\'allowed-once\'` is the only grant.\n * @throws when no turn is open or either audit event fails before the session\n *   append commit point.\n */',
       },
+      {
+        signature: 'inheritOverride(parent: Session, child: Session): void',
+        jsDoc: '/**\n * Stamp the parent\'s approval-policy OVERRIDE onto a child session through\n * the canonical write path — the delegation-inheritance step: a `\'never\'`\n * (headless/CI) parent must not mint children that fall back to a prompting\n * default. Only the override chain is copied: an unswitched parent stamps\n * nothing, so the child keeps following the LIVE configured default. A\n * child whose log (e.g. a fork seed) already folds to the inherited policy\n * is left untouched. Callers must append inside an open child turn — a bare\n * between-turn event is crash-tail garbage on reload.\n * @param parent - the delegating session whose effective override is read.\n * @param child - the child session the override is appended to.\n */',
+      },
     ],
   },
   {
@@ -442,6 +446,10 @@ export const SERVICE_API: readonly ServiceApiEntry[] = [
         signature: 'resolve(request: SandboxPolicyRequest = {}): SandboxExecutionPolicy',
         jsDoc: '/**\n * Resolve the complete policy for one capability call. An approved explicit\n * mode outranks the session\'s last `sandbox/mode` event, which outranks the\n * deployment default. A session cwd is its workspace-write boundary; the\n * configured root is the fallback for agentless calls and sessions without a\n * cwd.\n * @param request - optional session and approved mode override.\n * @returns the fully resolved per-call mode and absolute workspace root.\n */',
       },
+      {
+        signature: 'inheritOverride(parent: Session, child: Session): void',
+        jsDoc: '/**\n * Stamp the parent\'s sandbox-mode OVERRIDE onto a child session through the\n * canonical write path — the delegation-inheritance step: a child agent runs\n * under the policy its delegating parent was switched to, not under the\n * (possibly wider) deployment default. Only the override chain is copied: an\n * unswitched parent stamps nothing, so the child keeps following the LIVE\n * deployment default. A child whose log (e.g. a fork seed) already folds to\n * the inherited mode is left untouched. Callers must append inside an open\n * child turn — a bare between-turn event is crash-tail garbage on reload.\n * @param parent - the delegating session whose effective override is read.\n * @param child - the child session the override is appended to.\n */',
+      },
     ],
   },
   {

packages/sandbox/sandbox-policy/README.md

@@ -17,6 +17,7 @@ Two families enforce the same mode vocabulary: the sandboxed bash executor (`@de
 - `ctx.sandboxPolicy.defaultMode` / `ctx.sandboxPolicy.workspaceRoot` — the deployment default and fallback root used by `resolve()`.
 - `effectiveSandboxMode(events)` — the pure fold of a session's `sandbox/mode` events (the last switch wins, or `undefined`), used inside `resolve()`.
 - `setSandboxMode(session, mode)` — THE write path for a per-session override: appends exactly one `sandbox/mode` event. The switch IS its event; nothing mutates the mode out of band.
+- `ctx.sandboxPolicy.inheritOverride(parent, child)` — the delegation-inheritance step: stamps the parent session's effective override (never the deployment default) onto a child session through `setSandboxMode`, skipping a child that already folds to it. The in-process subagent driver calls it inside the child's first turn so a delegating parent's tightened mode binds its children ([rationale](../../../.agents/notes/implemented/feature/2026-07-25-subagent-policy-inheritance.md)).
 - `SANDBOX_MODES` — every mode, for option advertisement and runtime validation.
 
 The optional `./invariant` companion rejects a forged durable `sandbox/mode` event whose value falls outside that closed vocabulary; Session and its companion own the surrounding storage and turn-enclosure rules.

packages/sandbox/sandbox-policy/src/index.ts

@@ -19,7 +19,7 @@ import { Context, Service } from 'cordis'
 import z from 'schemastery'
 import { canonicalPath, type SandboxExecutionPolicy, type SandboxMode } from '@deepseek-ai/dsh-sandbox'
 import type { Session } from '@deepseek-ai/dsh-session'
-import { effectiveSandboxMode } from './session-mode.ts'
+import { effectiveSandboxMode, setSandboxMode } from './session-mode.ts'
 
 export { SANDBOX_MODES, effectiveSandboxMode, setSandboxMode } from './session-mode.ts'
 
@@ -104,6 +104,24 @@ export class SandboxPolicyService extends Service {
       workspaceRoot: resolveWorkspaceRoot(session?.header.cwd ?? this.workspaceRoot),
     }
   }
+
+  /**
+   * Stamp the parent's sandbox-mode OVERRIDE onto a child session through the
+   * canonical write path — the delegation-inheritance step: a child agent runs
+   * under the policy its delegating parent was switched to, not under the
+   * (possibly wider) deployment default. Only the override chain is copied: an
+   * unswitched parent stamps nothing, so the child keeps following the LIVE
+   * deployment default. A child whose log (e.g. a fork seed) already folds to
+   * the inherited mode is left untouched. Callers must append inside an open
+   * child turn — a bare between-turn event is crash-tail garbage on reload.
+   * @param parent - the delegating session whose effective override is read.
+   * @param child - the child session the override is appended to.
+   */
+  inheritOverride(parent: Session, child: Session): void {
+    const inherited = effectiveSandboxMode(parent.events)
+    if (inherited === undefined || effectiveSandboxMode(child.events) === inherited) return
+    setSandboxMode(child, inherited)
+  }
 }
 
 export default SandboxPolicyService

packages/sandbox/sandbox-policy/tests/policy.spec.ts

@@ -142,3 +142,47 @@ describe('the sandbox/mode session kit', () => {
     expect(modeEvents[0]?.data).toEqual({ mode: 'danger-full-access' })
   })
 })
+
+describe('inheritOverride (parent → child stamping)', () => {
+  const modeEvents = (session: Session) => session.events.filter(e => e.type === 'sandbox/mode')
+
+  it('stamps the parent LAST override onto the child through the canonical write path', async () => {
+    const ctx = await mounted()
+    const parent = session('sess-inherit-parent')
+    const child = session('sess-inherit-child')
+    setSandboxMode(parent, 'workspace-write')
+    setSandboxMode(parent, 'read-only')
+
+    ctx.sandboxPolicy.inheritOverride(parent, child)
+
+    const stamped = modeEvents(child)
+    expect(stamped).toHaveLength(1)
+    expect(stamped[0]?.data).toEqual({ mode: 'read-only' })
+  })
+
+  it('appends NOTHING when the parent never switched (the deployment default must stay live)', async () => {
+    const ctx = await mounted({ mode: 'workspace-write' })
+    const parent = session('sess-inherit-default-parent')
+    const child = session('sess-inherit-default-child')
+
+    ctx.sandboxPolicy.inheritOverride(parent, child)
+
+    // No event — a resumed child keeps following whatever the deployment
+    // default is THEN, instead of a frozen copy of today's default.
+    expect(child.events).toHaveLength(0)
+  })
+
+  it('skips the append when the child already folds to the inherited mode (fork-seed dedup)', async () => {
+    const ctx = await mounted()
+    const parent = session('sess-inherit-dedup-parent')
+    const child = session('sess-inherit-dedup-child')
+    setSandboxMode(parent, 'read-only')
+    // A fork seed can already carry the parent's switch; stamping again would
+    // append a redundant event on every delegation.
+    setSandboxMode(child, 'read-only')
+
+    ctx.sandboxPolicy.inheritOverride(parent, child)
+
+    expect(modeEvents(child)).toHaveLength(1)
+  })
+})

packages/subagent/subagent-inprocess/README.md

@@ -16,6 +16,8 @@ The driver follows this sequence:
 
 The child gets the parent's working-directory/session lineage and inherits the parent model unless `request.agentOptions` overrides it. It gets a fresh flat registration scope: parent ownership does not import parent tool restrictions or establish an authority subset.
 
+The child also inherits the parent's session POLICY overrides: a one-shot `agent/prompt-submit` listener installed during setup stamps the parent's effective `sandbox/mode` and `approval/policy` overrides onto the child through `ctx.sandboxPolicy.inheritOverride` / `ctx.approval.inheritOverride` (both consumed opportunistically — compositions without them delegate policy-free). Anchoring inside the child's first turn keeps the stamp turn-enclosed (durable) and ahead of the first request, and its log position after any fork-seed switch lets the ordinary last-event-wins fold resolve stale-seed timing; only the override chain is copied, so an unswitched parent stamps nothing and the child follows the live deployment default. Nesting composes: each stamp folds the delegating session's already-stamped log ([rationale](../../../.agents/notes/implemented/feature/2026-07-25-subagent-policy-inheritance.md)).
+
 ## Cancellation and ownership
 
 The required request signal covers both startup and the live run. Before publication, `AgentCreationTransaction` observes it, rolls back, and rejects. The factory detaches that creation-only listener before returning; the driver immediately checks the signal once more before installing a minimal live-run listener, closing the handoff race. After publication, abort cancels the child.

packages/subagent/subagent-inprocess/package.json

@@ -30,22 +30,28 @@
     "@deepseek-ai/dsh-agent": "^0.0.1",
     "@deepseek-ai/dsh-invariants": "^0.0.1",
     "@deepseek-ai/dsh-llm": "^0.0.1",
+    "@deepseek-ai/dsh-sandbox-policy": "^0.0.1",
     "@deepseek-ai/dsh-session": "^0.0.1",
     "@deepseek-ai/dsh-subagent": "^0.0.1",
     "@deepseek-ai/dsh-system-prompt": "^0.0.1",
     "@deepseek-ai/dsh-tools": "^0.0.1",
+    "@deepseek-ai/dsh-user-approval": "^0.0.1",
     "cordis": "^4.0.0-rc.7"
   },
   "devDependencies": {
     "@deepseek-ai/dsh-agent": "workspace:^",
     "@deepseek-ai/dsh-agent-loop": "workspace:^",
     "@deepseek-ai/dsh-agent-loop-testkit": "workspace:^",
+    "@deepseek-ai/dsh-fs-sandbox": "workspace:^",
     "@deepseek-ai/dsh-invariants": "workspace:^",
     "@deepseek-ai/dsh-llm": "workspace:^",
+    "@deepseek-ai/dsh-sandbox-policy": "workspace:^",
     "@deepseek-ai/dsh-session": "workspace:^",
     "@deepseek-ai/dsh-subagent": "workspace:^",
     "@deepseek-ai/dsh-system-prompt": "workspace:^",
+    "@deepseek-ai/dsh-tool-fs": "workspace:^",
     "@deepseek-ai/dsh-tools": "workspace:^",
+    "@deepseek-ai/dsh-user-approval": "workspace:^",
     "cordis": "^4.0.0-rc.7"
   }
 }

packages/subagent/subagent-inprocess/src/index.ts

@@ -14,6 +14,11 @@ import { findLastMessageTurnEnd, SessionId, type SessionEvent, type TurnEndReaso
 import type { ContentBlock } from '@deepseek-ai/dsh-llm'
 import { assertSubagentMaxDepth, delegationDepthOf } from '@deepseek-ai/dsh-subagent'
 import type { SubagentResult, SubagentRun, SubagentStartRequest, SubagentStopReason } from '@deepseek-ai/dsh-subagent'
+// Type-only: make `ctx.get('sandboxPolicy')` / `ctx.get('approval')` resolve
+// to the policy services when composed — the driver consumes both
+// opportunistically (the documented `ctx.get` pattern), never as a hard dep.
+import type {} from '@deepseek-ai/dsh-sandbox-policy'
+import type {} from '@deepseek-ai/dsh-user-approval'
 import {
   attachStructuredRuntime,
   type StructuredAttachment,
@@ -104,6 +109,20 @@ export async function startInProcessRun(
     if (request.outputSchema !== undefined) {
       structured = attachStructuredRuntime(childCtx, request.outputSchema)
     }
+    // Policy inheritance: stamp the parent's sandbox/approval OVERRIDES onto
+    // the child once, anchored inside the child's FIRST turn (prompt-submit
+    // runs after turn/start, before prompt assembly) — a bare between-turn
+    // append would be crash-tail garbage on reload, and stamping here also
+    // orders the override after any stale switch a fork seed carried, so the
+    // ordinary last-event-wins fold resolves it. One-shot: later turns must
+    // not re-stamp over a switch the child made itself. Both services are
+    // consumed opportunistically — without them, delegation stays policy-free.
+    const disposeInherit = childCtx.on('agent/prompt-submit', (childAgent, _content, _source, _signal, next) => {
+      disposeInherit()
+      parent.ctx.get('sandboxPolicy')?.inheritOverride(parent.session, childAgent.session)
+      parent.ctx.get('approval')?.inheritOverride(parent.session, childAgent.session)
+      return next()
+    })
   }
 
   const flags = { cancelled: false }

packages/subagent/subagent-inprocess/tests/inheritance.spec.ts

@@ -0,0 +1,403 @@
+/**
+ * Policy inheritance from parent to in-process child agents, proven against
+ * the REAL enforcement wall: a real loop drives a scripted mock MODEL whose
+ * children hit the real `dsh-fs-sandbox` fence through the real `write` tool,
+ * and every claim is asserted on physical facts — does the file exist on
+ * disk, what denial text landed in the child's tool result. Nothing here asks
+ * the policy service what it WOULD do; the child either writes or is denied.
+ *
+ * Red/green anchor for the delegation-bypass gap: a parent switched to
+ * `read-only` must not mint children that run under the (wider) deployment
+ * default. The stamping design is itself pinned by the mounted session
+ * invariants: an implementation that appends the inherited override OUTSIDE
+ * the child's first turn fails these suites through the turn-enclosure check.
+ */
+
+import { describe, expect, it, beforeEach, afterEach } from 'vitest'
+import { mkdtemp, readFile, realpath, rm } from 'node:fs/promises'
+import { tmpdir } from 'node:os'
+import { join } from 'node:path'
+import { Context } from 'cordis'
+import type { Agent } from '@deepseek-ai/dsh-agent'
+import { SessionId } from '@deepseek-ai/dsh-session'
+import type { SessionEvent } from '@deepseek-ai/dsh-session'
+import AgentLoop from '@deepseek-ai/dsh-agent-loop'
+import { mountAgentLoopTestDependencies } from '@deepseek-ai/dsh-agent-loop-testkit'
+import InvariantService from '@deepseek-ai/dsh-invariants'
+import * as SessionInvariant from '@deepseek-ai/dsh-session/invariant'
+import * as AgentInvariant from '@deepseek-ai/dsh-agent/invariant'
+import * as AgentLoopInvariant from '@deepseek-ai/dsh-agent-loop/invariant'
+import SubagentService from '@deepseek-ai/dsh-subagent'
+import { defineTool } from '@deepseek-ai/dsh-tools'
+import type { ContentBlock } from '@deepseek-ai/dsh-llm'
+import SandboxPolicyService, { setSandboxMode } from '@deepseek-ai/dsh-sandbox-policy'
+import SandboxedFileSystem from '@deepseek-ai/dsh-fs-sandbox'
+import * as ToolFs from '@deepseek-ai/dsh-tool-fs'
+import ApprovalService, { setApprovalPolicy } from '@deepseek-ai/dsh-user-approval'
+import { MockAdapter, textResponse, toolCallResponse } from '../../../core/agent-loop/tests/mock-adapter.ts'
+import { startInProcessRun } from '../src/index.ts'
+
+type Script = ConstructorParameters<typeof MockAdapter>[0]
+
+const READ_ONLY_DENIAL = '[sandbox: file access denied under read-only mode]'
+
+let workspace: string
+
+beforeEach(async () => {
+  // realpath: macOS tmpdir is symlinked (/var → /private/var); resolve once so
+  // path assertions and the fence's canonicalization agree on one spelling.
+  workspace = await realpath(await mkdtemp(join(tmpdir(), 'dsh-inherit-')))
+})
+afterEach(async () => {
+  await rm(workspace, { recursive: true, force: true })
+})
+
+async function mountInvariants(ctx: Context): Promise<void> {
+  await ctx.plugin(InvariantService)
+  await ctx.plugin(SessionInvariant)
+  await ctx.plugin(AgentInvariant)
+  await ctx.plugin(AgentLoopInvariant)
+}
+
+/**
+ * The walled composition: real loop + real sandbox-policy home + the real
+ * confining filesystem backend + the real `write` tool + the approval seam
+ * (mounted with NO answerer — the in-process child reality). The deployment
+ * default is deliberately WIDER (`workspace-write`) than the parent's staged
+ * `read-only` override, so a child that fails to inherit visibly escapes.
+ *
+ * The script array is taken by reference and filled by each test AFTER the
+ * parent exists, so scripted side-effect entries can close over it.
+ */
+async function setupWalled(script: Script) {
+  const ctx = new Context()
+  await mountAgentLoopTestDependencies(ctx)
+  await mountInvariants(ctx)
+  await ctx.plugin(SandboxPolicyService, { mode: 'workspace-write', workspaceRoot: workspace })
+  await ctx.plugin(SandboxedFileSystem, { cwd: workspace })
+  await ctx.plugin(ToolFs)
+  await ctx.plugin(ApprovalService)
+  await ctx.plugin(AgentLoop, { agents: [] })
+  await ctx.plugin(SubagentService)
+  ctx.llm.registerAdapter(['mock'], new MockAdapter(script))
+  const parent = ctx.agentLoop.create(SessionId('parent'), { provider: 'mock', model: 'mock' }, { cwd: workspace })
+  return { ctx, parent }
+}
+
+/** Bare composition: no sandbox, no fs, no approval — delegation must not care. */
+async function setupBare(script: Script) {
+  const ctx = new Context()
+  await mountAgentLoopTestDependencies(ctx)
+  await mountInvariants(ctx)
+  await ctx.plugin(AgentLoop, { agents: [] })
+  await ctx.plugin(SubagentService)
+  ctx.llm.registerAdapter(['mock'], new MockAdapter(script))
+  const parent = ctx.agentLoop.create(SessionId('parent'), { provider: 'mock', model: 'mock' })
+  return { ctx, parent }
+}
+
+/**
+ * Register the delegation scratch tool: delegating from INSIDE an open parent
+ * turn is exactly the real tool-subagent shape, and it is what makes the
+ * "user switched while idle, model delegates in the very next turn" fork
+ * timing constructible (the post-seed switch lives in the still-open turn).
+ * `fork: true` seeds the child with the caller's completed-turn prefix,
+ * mirroring the fork provider's slice.
+ */
+function registerDelegate(ctx: Context, captured: Agent[]): void {
+  ctx.tools.register(defineTool({
+    name: 'delegate',
+    description: 'delegate a task to an in-process child (test scaffold)',
+    parameters: { fork: { type: 'boolean', description: 'seed the child with the completed-turn prefix' } },
+    async execute(args, exec): Promise<ContentBlock[]> {
+      const caller = exec.agent
+      if (caller === undefined) throw new Error('delegate scaffold requires a calling agent')
+      const events = caller.session.events
+      const lastEnd = events.findLast(e => e.type === 'turn/end')
+      const seed = lastEnd === undefined ? [] : events.slice(0, lastEnd.seq + 1)
+      const run = await startInProcessRun(
+        { prompt: [{ type: 'text', text: 'delegated task' }], parent: caller, signal: exec.signal },
+        args.fork === true && seed.length > 0 ? { seed } : {},
+      )
+      captured.push(run.localAgent as Agent)
+      const result = await run.result
+      await run.dispose()
+      return [{ type: 'text', text: `child:${result.stopReason}` }]
+    },
+  }))
+}
+
+/** All tool/result texts in a session log, in order. */
+function toolResultTexts(agent: Agent): string[] {
+  return agent.session.events
+    .filter((e): e is SessionEvent<'tool/result'> => e.type === 'tool/result')
+    .map(e => e.data.content.filter((b): b is Extract<ContentBlock, { type: 'text' }> => b.type === 'text').map(b => b.text).join(''))
+}
+
+/** Count the policy-override events in a session log. */
+function overrideEvents(agent: Agent): { sandbox: number; approval: number } {
+  const events = agent.session.events
+  return {
+    sandbox: events.filter(e => e.type === 'sandbox/mode').length,
+    approval: events.filter(e => e.type === 'approval/policy').length,
+  }
+}
+
+function spawnRequest(parent: Agent) {
+  return {
+    prompt: [{ type: 'text' as const, text: 'child task' }],
+    parent,
+    signal: new AbortController().signal,
+  }
+}
+
+describe('sandbox-mode inheritance against the real fs fence', () => {
+  it('a SPAWN child of a read-only parent is denied by the real fence (no file on disk)', async () => {
+    const script: Script = []
+    const { ctx, parent } = await setupWalled(script)
+    const blocked = join(workspace, 'spawn-blocked.txt')
+    script.push(
+      // The switch is staged INSIDE a parent turn — the same turn-enclosed
+      // anchoring every real switch path (ACP pending switches) uses.
+      () => {
+        setSandboxMode(parent.session, 'read-only')
+        setApprovalPolicy(parent.session, 'never')
+        return textResponse('staged')
+      },
+      toolCallResponse('c-write', 'write', { file_path: blocked, content: 'escaped' }),
+      textResponse('child done'),
+    )
+    parent.send([{ type: 'text', text: 'stage the session policy' }])
+    await parent.whenIdle()
+    const parentLogLength = parent.session.events.length
+
+    const run = await startInProcessRun(spawnRequest(parent), {})
+    const result = await run.result
+    const child = run.localAgent as Agent
+
+    // The physical fact: the write never reached the disk.
+    await expect(readFile(blocked, 'utf8')).rejects.toMatchObject({ code: 'ENOENT' })
+    // The model-visible fact: the child saw the read-only denial marker.
+    expect(toolResultTexts(child).join('\n')).toContain(READ_ONLY_DENIAL)
+    expect(result.stopReason).toBe('completed')
+
+    // The stamped override is the child's OWN durable, turn-enclosed record:
+    // after turn/start, before the first model request snapshot.
+    const events = child.session.events
+    const turnStart = events.findIndex(e => e.type === 'turn/start')
+    const mode = events.findIndex(e => e.type === 'sandbox/mode')
+    const policy = events.findIndex(e => e.type === 'approval/policy')
+    const header = events.findIndex(e => e.type === 'request/header')
+    expect(mode).toBeGreaterThan(turnStart)
+    expect(policy).toBeGreaterThan(turnStart)
+    expect(header).toBeGreaterThan(mode)
+    // What the enforcing families resolve for the child, end to end.
+    expect(ctx.sandboxPolicy.resolve({ session: child.session }).mode).toBe('read-only')
+    // Inheritance reads the parent log, never writes it.
+    expect(parent.session.events.length).toBe(parentLogLength)
+
+    await run.dispose()
+  })
+
+  it('a FORK child inherits the parent switch made AFTER the seed boundary (stale-seed timing)', async () => {
+    const script: Script = []
+    const captured: Agent[] = []
+    const { ctx, parent } = await setupWalled(script)
+    registerDelegate(ctx, captured)
+    const blocked = join(workspace, 'fork-blocked.txt')
+    script.push(
+      // Turn 1: the OLD, wider switch — this one lands in the fork seed.
+      () => {
+        setSandboxMode(parent.session, 'workspace-write')
+        return textResponse('turn one')
+      },
+      // Turn 2: the user tightened to read-only, then the model delegates in
+      // the SAME turn — the switch is in the log but past the seed slice.
+      () => {
+        setSandboxMode(parent.session, 'read-only')
+        return toolCallResponse('d-fork', 'delegate', { fork: true })
+      },
+      toolCallResponse('c-write', 'write', { file_path: blocked, content: 'escaped' }),
+      textResponse('fork child done'),
+      textResponse('turn two done'),
+    )
+    parent.send([{ type: 'text', text: 'turn one' }])
+    await parent.whenIdle()
+    parent.send([{ type: 'text', text: 'turn two: delegate' }])
+    await parent.whenIdle()
+
+    const child = captured[0] as Agent
+    // The seed really carried the stale workspace-write switch…
+    expect(child.session.events.some(e => e.type === 'sandbox/mode' && e.data.mode === 'workspace-write')).toBe(true)
+    // …and the newest parent state still won, on disk and in resolution.
+    await expect(readFile(blocked, 'utf8')).rejects.toMatchObject({ code: 'ENOENT' })
+    expect(toolResultTexts(child).join('\n')).toContain(READ_ONLY_DENIAL)
+    expect(ctx.sandboxPolicy.resolve({ session: child.session }).mode).toBe('read-only')
+  })
+
+  it('a FORK child whose seed already folds to the parent mode gets NO duplicate stamp (guard)', async () => {
+    const script: Script = []
+    const captured: Agent[] = []
+    const { ctx, parent } = await setupWalled(script)
+    registerDelegate(ctx, captured)
+    const blocked = join(workspace, 'fork-dedup-blocked.txt')
+    script.push(
+      () => {
+        setSandboxMode(parent.session, 'read-only')
+        return textResponse('turn one')
+      },
+      toolCallResponse('d-fork', 'delegate', { fork: true }),
+      toolCallResponse('c-write', 'write', { file_path: blocked, content: 'escaped' }),
+      textResponse('fork child done'),
+      textResponse('turn two done'),
+    )
+    parent.send([{ type: 'text', text: 'turn one' }])
+    await parent.whenIdle()
+    parent.send([{ type: 'text', text: 'turn two: delegate' }])
+    await parent.whenIdle()
+
+    const child = captured[0] as Agent
+    // The seed-carried override keeps enforcing…
+    await expect(readFile(blocked, 'utf8')).rejects.toMatchObject({ code: 'ENOENT' })
+    expect(ctx.sandboxPolicy.resolve({ session: child.session }).mode).toBe('read-only')
+    // …and inheritance did not append a redundant copy on top of it.
+    expect(overrideEvents(child).sandbox).toBe(1)
+  })
+
+  it('a GRANDCHILD inherits through the chain (child delegates again)', async () => {
+    const script: Script = []
+    const captured: Agent[] = []
+    const { ctx, parent } = await setupWalled(script)
+    registerDelegate(ctx, captured)
+    const blocked = join(workspace, 'grandchild-blocked.txt')
+    script.push(
+      () => {
+        setSandboxMode(parent.session, 'read-only')
+        return textResponse('staged')
+      },
+      toolCallResponse('d-child', 'delegate', { fork: false }),
+      // Child immediately delegates the write to a grandchild.
+      toolCallResponse('d-grandchild', 'delegate', { fork: false }),
+      toolCallResponse('g-write', 'write', { file_path: blocked, content: 'escaped' }),
+      textResponse('grandchild done'),
+      textResponse('child done'),
+      textResponse('parent done'),
+    )
+    parent.send([{ type: 'text', text: 'stage' }])
+    await parent.whenIdle()
+    parent.send([{ type: 'text', text: 'delegate twice' }])
+    await parent.whenIdle()
+
+    expect(captured).toHaveLength(2)
+    const grandchild = captured[1] as Agent
+    expect(grandchild.session.header.delegationDepth).toBe(2)
+    await expect(readFile(blocked, 'utf8')).rejects.toMatchObject({ code: 'ENOENT' })
+    expect(toolResultTexts(grandchild).join('\n')).toContain(READ_ONLY_DENIAL)
+    expect(ctx.sandboxPolicy.resolve({ session: grandchild.session }).mode).toBe('read-only')
+  })
+})
+
+describe('inheritance guards (must hold before AND after the fix)', () => {
+  it('a child of an unswitched parent runs under the live deployment default, with ZERO stamped events', async () => {
+    const script: Script = []
+    const { parent } = await setupWalled(script)
+    const allowed = join(workspace, 'default-allowed.txt')
+    script.push(
+      toolCallResponse('c-write', 'write', { file_path: allowed, content: 'fine' }),
+      textResponse('child done'),
+    )
+
+    const run = await startInProcessRun(spawnRequest(parent), {})
+    await run.result
+    const child = run.localAgent as Agent
+
+    // workspace-write (the deployment default) really allowed the write…
+    expect(await readFile(allowed, 'utf8')).toBe('fine')
+    // …and nothing froze that default into the child log.
+    expect(overrideEvents(child)).toEqual({ sandbox: 0, approval: 0 })
+
+    await run.dispose()
+  })
+
+  it('delegation works unchanged when no sandbox/approval services are composed at all', async () => {
+    const script: Script = []
+    const { parent } = await setupBare(script)
+    script.push(textResponse('bare child answer'))
+
+    const run = await startInProcessRun(spawnRequest(parent), {})
+    const result = await run.result
+    const child = run.localAgent as Agent
+
+    expect(result.stopReason).toBe('completed')
+    expect(overrideEvents(child)).toEqual({ sandbox: 0, approval: 0 })
+
+    await run.dispose()
+  })
+})
+
+describe('what a blocked child experiences', () => {
+  it('an inherited "never" policy is stated in the child FIRST request system prompt', async () => {
+    const script: Script = []
+    const { parent } = await setupWalled(script)
+    script.push(
+      () => {
+        setApprovalPolicy(parent.session, 'never')
+        return textResponse('staged')
+      },
+      textResponse('child done'),
+    )
+    parent.send([{ type: 'text', text: 'stage' }])
+    await parent.whenIdle()
+
+    const run = await startInProcessRun(spawnRequest(parent), {})
+    await run.result
+    const child = run.localAgent as Agent
+
+    // Model-visible ⟺ logged: the child was TOLD up front not to request
+    // escalation, in the very first request it ever saw.
+    const header = child.session.events.find((e): e is SessionEvent<'request/header'> => e.type === 'request/header')
+    expect(header?.data.header.system).toContain('Approval prompts are disabled')
+
+    await run.dispose()
+  })
+
+  it('a denied child that retries with sandbox_permissions fails closed on the REAL escalation gate', async () => {
+    const script: Script = []
+    const { parent } = await setupWalled(script)
+    const blocked = join(workspace, 'escalation-blocked.txt')
+    script.push(
+      () => {
+        setSandboxMode(parent.session, 'read-only')
+        return textResponse('staged')
+      },
+      // First attempt: denied by the fence.
+      toolCallResponse('c-write', 'write', { file_path: blocked, content: 'escaped' }),
+      // One-shot escalation retry, exactly as the denial hint teaches — the
+      // approval seam is mounted but NO answerer owns an in-process child.
+      toolCallResponse('c-escalate', 'write', {
+        file_path: blocked,
+        content: 'escaped',
+        sandbox_permissions: 'workspace-write',
+        justification: 'the test child wants to write inside the workspace',
+      }),
+      textResponse('child gave up'),
+    )
+    parent.send([{ type: 'text', text: 'stage' }])
+    await parent.whenIdle()
+
+    const run = await startInProcessRun(spawnRequest(parent), {})
+    const result = await run.result
+    const child = run.localAgent as Agent
+
+    // Nothing ever reached the disk — not the first attempt, not the retry.
+    await expect(readFile(blocked, 'utf8')).rejects.toMatchObject({ code: 'ENOENT' })
+    const results = toolResultTexts(child)
+    expect(results[0]).toContain(READ_ONLY_DENIAL)
+    // The child's escalation resolves through the real approval waterfall to
+    // the distinct fail-closed reason — the honest "report upward" signal.
+    expect(results[1]).toContain('no approval channel is available')
+    expect(result.stopReason).toBe('completed')
+
+    await run.dispose()
+  })
+})

packages/subagent/subagent-inprocess/tsconfig.json

@@ -32,8 +32,14 @@
     {
       "path": "../../core/tools"
     },
+    {
+      "path": "../../sandbox/sandbox-policy"
+    },
     {
       "path": "../../support/invariants"
+    },
+    {
+      "path": "../../ui/user-approval"
     }
   ]
 }

packages/ui/user-approval/README.md

@@ -6,7 +6,7 @@ Each request must belong to an open agent turn. The service appends a paired `ap
 
 Answerers are `approval/request` waterfall listeners. Return an outcome to answer for an owned agent or call `next()` to delegate. Agent-scoped listeners receive only that agent's requests; compose one terminal answerer per deployment because sibling listener order is not a policy priority mechanism. The ACP bridge is the shipped human answerer.
 
-`ApprovalPolicy` is `'ask'` or `'never'`. The effective value is the last `approval/policy` event, falling back to config; `setApprovalPolicy()` is the write path. `'never'` rejects before interactive dispatch and is the only policy stated in the prompt. Switches produce at most one coalesced notice, attributed to the user when the override follows the last `request/header` and to operator/config otherwise.
+`ApprovalPolicy` is `'ask'` or `'never'`. The effective value is the last `approval/policy` event, falling back to config; `setApprovalPolicy()` is the write path. `'never'` rejects before interactive dispatch and is the only policy stated in the prompt. Switches produce at most one coalesced notice, attributed to the user when the override follows the last `request/header` and to operator/config otherwise. `ctx.approval.inheritOverride(parent, child)` stamps a parent session's override (never the configured default) onto a child session through that write path — the in-process subagent driver calls it inside the child's first turn so a `'never'` parent cannot mint prompting children ([rationale](../../../.agents/notes/implemented/feature/2026-07-25-subagent-policy-inheritance.md)).
 
 The tools pipeline routes `ask` decisions through this seam and fails closed when it is absent; the sandboxed bash tool also uses it for escalated retries. The ACP bridge is the shipped human answerer for calls it owns. Audit events remain log-only, so the model sees only the asking consumer's result. See the [approval-seam Agent Note](../../../.agents/notes/implemented/feature/2026-07-06-approval-seam.md) and [sandbox Agent Note](../../../.agents/notes/implemented/feature/2026-07-06-sandbox.md).
 

packages/ui/user-approval/src/index.ts

@@ -326,6 +326,24 @@ export class ApprovalService extends Service {
     return effectiveApprovalPolicy(session.events) ?? this.config.policy ?? 'ask'
   }
 
+  /**
+   * Stamp the parent's approval-policy OVERRIDE onto a child session through
+   * the canonical write path — the delegation-inheritance step: a `'never'`
+   * (headless/CI) parent must not mint children that fall back to a prompting
+   * default. Only the override chain is copied: an unswitched parent stamps
+   * nothing, so the child keeps following the LIVE configured default. A
+   * child whose log (e.g. a fork seed) already folds to the inherited policy
+   * is left untouched. Callers must append inside an open child turn — a bare
+   * between-turn event is crash-tail garbage on reload.
+   * @param parent - the delegating session whose effective override is read.
+   * @param child - the child session the override is appended to.
+   */
+  inheritOverride(parent: Session, child: Session): void {
+    const inherited = effectiveApprovalPolicy(parent.events)
+    if (inherited === undefined || effectiveApprovalPolicy(child.events) === inherited) return
+    setApprovalPolicy(child, inherited)
+  }
+
   /**
    * Dispatch the waterfall, contained and raced against the request signal.
    * @param req - the borrowed public request.

packages/ui/user-approval/tests/approval.spec.ts

@@ -576,3 +576,46 @@ describe('approval policy (the approval/policy fold)', () => {
     expect(afterDispose.injected).toEqual([])
   })
 })
+
+describe('inheritOverride (parent → child stamping)', () => {
+  const policyEvents = (session: Session) => session.events.filter(e => e.type === 'approval/policy')
+
+  function bareSession(id: string): Session {
+    return new Session(SessionId(id))
+  }
+
+  it('stamps the parent LAST override onto the child through the canonical write path', async () => {
+    const ctx = await mounted()
+    const parent = bareSession('sess-appr-inherit-parent')
+    const child = bareSession('sess-appr-inherit-child')
+    setApprovalPolicy(parent, 'never')
+
+    ctx.approval.inheritOverride(parent, child)
+
+    const stamped = policyEvents(child)
+    expect(stamped).toHaveLength(1)
+    expect(stamped[0]?.data).toEqual({ policy: 'never' })
+  })
+
+  it('appends NOTHING when the parent never switched (the configured default must stay live)', async () => {
+    const ctx = await mounted()
+    const parent = bareSession('sess-appr-default-parent')
+    const child = bareSession('sess-appr-default-child')
+
+    ctx.approval.inheritOverride(parent, child)
+
+    expect(child.events).toHaveLength(0)
+  })
+
+  it('skips the append when the child already folds to the inherited policy (fork-seed dedup)', async () => {
+    const ctx = await mounted()
+    const parent = bareSession('sess-appr-dedup-parent')
+    const child = bareSession('sess-appr-dedup-child')
+    setApprovalPolicy(parent, 'never')
+    setApprovalPolicy(child, 'never')
+
+    ctx.approval.inheritOverride(parent, child)
+
+    expect(policyEvents(child)).toHaveLength(1)
+  })
+})

pnpm-lock.yaml

@@ -3138,12 +3138,18 @@ importers:
       '@deepseek-ai/dsh-agent-loop-testkit':
         specifier: workspace:^
         version: link:../../support/agent-loop-testkit
+      '@deepseek-ai/dsh-fs-sandbox':
+        specifier: workspace:^
+        version: link:../../fs/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-policy':
+        specifier: workspace:^
+        version: link:../../sandbox/sandbox-policy
       '@deepseek-ai/dsh-session':
         specifier: workspace:^
         version: link:../../core/session
@@ -3153,9 +3159,15 @@ importers:
       '@deepseek-ai/dsh-system-prompt':
         specifier: workspace:^
         version: link:../../core/system-prompt
+      '@deepseek-ai/dsh-tool-fs':
+        specifier: workspace:^
+        version: link:../../fs/tool-fs
       '@deepseek-ai/dsh-tools':
         specifier: workspace:^
         version: link:../../core/tools
+      '@deepseek-ai/dsh-user-approval':
+        specifier: workspace:^
+        version: link:../../ui/user-approval
       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)