Merge pull request #2613 from deepseek-harness/feat/web-settings-describe-mirror

refactor(client): serve every settings consumer from one describe mirror

.agents/notes/implemented/architecture/2026-08-12-plugin-owned-settings-surface.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/2026-08-12-plugin-owned-settings-surface.md
-2026-08-12-plugin-owned-settings-surface.md: 3137cfe81ef3cb78a940f085c559ab4a7b62cce3
-2026-08-12-plugin-owned-settings-surface.zh.md: 8dd5e5ccebf1cfb80b55a615f6049dd391943bd7
+2026-08-12-plugin-owned-settings-surface.md: 722e6cfbe890418e8305f89790e76976027d7775
+2026-08-12-plugin-owned-settings-surface.zh.md: 93e5227d5f6a629fd32f5a2fe22e9882c7f7c5ac

.agents/notes/implemented/architecture/2026-08-12-plugin-owned-settings-surface.md

@@ -22,7 +22,7 @@ Together the two meant a user-authored plugin was configurable only by hand-edit
 
 **`settings.plugin.item` is keyed on the settings namespace.** The slot moved from `list` to `keyed`, the key being the namespace the card edits, following the `tool.call.toolview` precedent where each tool plugin registers its renderer under the tool name. A card declares `key`, not `id`/`order`. The slot is declared by the Plugins section's `configurable` tab, which owns the card list.
 
-**The tab drives dispatch from the served namespaces.** It reads `settings.describe` once, subscribes to the settings-document invalidation and to connection resets, and dispatches one key per served namespace. What renders is the intersection of two ledgers — namespaces a live Host plugin registered, and cards registered under those keys — computed in the tab's controller from the slot ledger (`ctx.slots.entries`, `ctx.slots.subscribe`) and the wire answer.
+**The tab drives dispatch from the served namespaces.** It derives the current served set from `ctx.settingsScope.describe()` and follows that shared settings mirror, while its own listener follows the card slot ledger. It dispatches one key per served namespace. What renders is the intersection of two ledgers — namespaces a live Host plugin registered, and cards registered under those keys — computed in the tab's controller from the slot ledger (`ctx.slots.entries`, `ctx.slots.subscribe`) and the mirror answer. The later [settings describe mirror decision](2026-08-17-settings-describe-mirror.md) owns the browser-wide read and invalidation lifecycle.
 
 Keying makes absence the signal, and that is what removes the bookkeeping the previous shape needed. A namespace another surface owns (`ui-theme`, `permission`, `llm-*`, `agent-presets`) has no card under its key, so it renders nothing without declaring anything anywhere. A card whose namespace this deployment does not serve is never dispatched, which also fixes the old empty-state defect: the tab counted registered cards, including ones rendering nothing, so a deployment exposing none showed an empty list instead of its empty line.
 
@@ -56,6 +56,6 @@ A plugin distributed outside this repository is configurable from the settings p
 
 Deferred, and larger than this change: the redactor returns a `role('secret')` reachable only through a union, intersection, or transform verbatim (its own `TODO(settings-wire-redaction)`), and `schema.toJSON()` carries a secret's default. That gap predates this change, but serving every registered namespace widens its blast radius from schemas audited in this repository to any third-party schema, so the wire should refuse a namespace it cannot prove it can redact. Also deferred: an assembled-composition test of the headline capability — an overlay-mounted fixture plugin whose Host half registers a namespace and whose `dsh.client` half registers a card, asserted end-to-end. The current coverage proves each half separately; the shipped cards' unchanged output cannot prove the new path.
 
-The wire read the section adds is one `settings.describe` beside the per-scope reads the cards already make. Its invalidation is imprecise in one direction: the wire announces document commits and connection resets, not registrations, so a namespace registered after the section's read joins on the next commit or reconnect.
+The section and its cards add no `settings.describe` reads: both derive from the browser-wide mirror. Its invalidation is imprecise in one direction: the wire announces document commits and connection resets, not registrations, so a namespace registered after the mirror's current answer joins on the next commit or reconnect.
 
 Two frictions remain for an author outside this repository, both recorded in the section's README. The browser half must be a `dsh.client` package built in the client module system's lazy-CJS factory format, and the `clientBundle` preset that emits it lives in `packages/client/tsdown.client.ts` rather than a published package. The bundle-purity gate forbids importing this package's card chrome or staged-form model as values, so such a card reimplements staging and revision fencing. Sharing them would mean either publishing the preset or declaring a child slot inside the card so the section supplies the chrome; neither is built.

.agents/notes/implemented/architecture/2026-08-12-plugin-owned-settings-surface.zh.md

@@ -22,7 +22,7 @@ Status: implemented
 
 **`settings.plugin.item` 以 settings 命名空间为键。** 该 slot 从 `list` 改为 `keyed`，键就是卡片所编辑的命名空间，沿用 `tool.call.toolview` 的先例——每个工具插件把自己的渲染器注册在工具名这个键上。卡片声明 `key`，不再声明 `id`/`order`。该 slot 由「插件」分区的 `configurable` 标签页声明，卡片列表归它所有。
 
-**标签页以被服务的命名空间驱动派发。** 它读取一次 `settings.describe`，订阅 settings 文档失效通知与连接重置，并为每个被服务的命名空间派发一个键。渲染出来的是两份账本的交集——存活 Host 插件注册的命名空间，以及注册在这些键上的卡片——由标签页的 controller 从 slot 账本（`ctx.slots.entries`、`ctx.slots.subscribe`）与协议答复算出。
+**标签页以被服务的命名空间驱动派发。** 它从 `ctx.settingsScope.describe()` 派生当前被服务的集合并跟随该共享 settings 镜像，自身的监听器只跟随卡片 slot 账本；随后为每个被服务的命名空间派发一个键。渲染出来的是两份账本的交集——存活 Host 插件注册的命名空间，以及注册在这些键上的卡片——由标签页的 controller 从 slot 账本（`ctx.slots.entries`、`ctx.slots.subscribe`）与镜像应答算出。后续的 [settings describe 镜像决策](2026-08-17-settings-describe-mirror.md)持有浏览器全局的读取与失效生命周期。
 
 以命名空间为键，让「缺席」本身成为信号，而这正是它消掉旧形态所需簿记的原因。归别的界面所有的命名空间（`ui-theme`、`permission`、`llm-*`、`agent-presets`）在其键上没有卡片，于是什么都不渲染，且无需在任何地方声明任何东西。命名空间未被本部署服务的卡片根本不会被派发，这同时修掉了旧的空态缺陷：标签页数的是已注册卡片，其中包含那些什么都不渲染的，因此一个都不暴露的部署看到的是空列表，而不是它那行空态文案。
 
@@ -56,6 +56,6 @@ Status: implemented
 
 以下延后，且都大于本次改动：脱敏器对只能经由 union、intersection 或 transform 抵达的 `role('secret')` 原样返回（其自身的 `TODO(settings-wire-redaction)`），而 `schema.toJSON()` 会携带 secret 的默认值。该缺口早于本次改动，但服务每一个已注册命名空间，把它的影响面从本仓库内经审计的 schema 扩大到任意第三方 schema，因此协议应当拒绝服务它无法证明可安全脱敏的命名空间。同样延后的还有：对本次头号能力的组装态测试——用 overlay 挂载一个 fixture 插件（Host 半注册命名空间、`dsh.client` 半注册卡片）并在端到端断言。当前覆盖分别证明了两个半侧；已发卡片输出未变这一点，证明不了新路径。
 
-分区新增的协议读取是一次 `settings.describe`，与卡片各自已有的 per-scope 读取并列。它的失效通知在一个方向上不精确：协议通告的是文档提交与连接重置，而非注册行为，因此在分区读取之后才被注册的命名空间，要等下一次提交或重连才会加入。
+分区与其中的卡片都不再新增 `settings.describe` 读取：两者都从浏览器全局的镜像派生。它的失效通知在一个方向上不精确：协议通告的是文档提交与连接重置，而非注册行为，因此在镜像当前应答之后才被注册的命名空间，要等下一次提交或重连才会加入。
 
 对仓库之外的作者仍留有两处摩擦，均记在该分区的 README 里。浏览器半侧必须是按客户端模块系统的 lazy-CJS factory 格式构建的 `dsh.client` 包，而产出它的 `clientBundle` 预设位于 `packages/client/tsdown.client.ts`，并非已发布的包。bundle 纯净度门禁禁止以值的形式导入本包的卡片外观与暂存表单模型，因此这样的卡片要重新实现暂存与 revision 设栅。要共享它们，要么发布该预设，要么在卡片内部声明一层子 slot 让分区提供外观；两者都尚未构建。

.agents/notes/implemented/architecture/2026-08-17-settings-describe-mirror.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/architecture/2026-08-17-settings-describe-mirror.md
+2026-08-17-settings-describe-mirror.md: a3774699ff328a44aed192a16dea0fa19d03c83c
+2026-08-17-settings-describe-mirror.zh.md: c57f5630b4bee0cd77a29a6f5458cb439c7f0585

.agents/notes/implemented/architecture/2026-08-17-settings-describe-mirror.md

@@ -0,0 +1,34 @@
+# Agent Note: Settings describe mirror
+
+Status: implemented
+
+English | [中文](2026-08-17-settings-describe-mirror.zh.md)
+
+## Problem
+
+A cold web boot issued `settings.describe` fifteen times inside ~200ms, and the count grew by two with every client plugin that owned a preference. Two mechanisms stacked: `SettingsScopeBinder.bind()` started a full-document read per bound scope (six scopes in the product composition, plus the plugin-directory tab, the welcome gate, and the models onboarding join), and `onConnected` emits `connection/reset` on the FIRST connection too, so every one of those readers immediately re-read the answer it had fetched milliseconds earlier. Each reader also carried its own invalidation subscriptions and its own `refreshIfLoaded`-style guard, and fifteen independent reads could in principle land on fifteen different document revisions.
+
+## Decision
+
+**One reader, many derivations.** `dsh-client-ui-settings` owns `SettingsDescribeMirror`, the single `settings.describe` reader in the browser: one snapshot store holding the whole answer, refreshed by the owning plugin's two subscriptions (`settings/document-updated`, `connection/reset`). Concurrent `load()` calls fold into the in-flight read plus at most one rerun. The in-flight slot owns a run before its loading publication can synchronously reenter `load()`, then clears inside the run's own try/finally in the same synchronous segment that observes the rerun flag; a `.finally()` on the returned promise would run one microtask later and let a refresh landing in that gap mark a rerun nobody reads.
+
+`bind()` still returns the unchanged `SettingsScope<T>` face, but the controller is now a selector over the mirror: no read path of its own, the same decode rules, and the write queue kept. A committed write folds its answered view back into the mirror (`acceptView`), so sibling scopes see the new revision with no re-read; the fold invalidates any older in-flight answer, and a write before the first held document reruns that read instead of publishing a partial document. A failed latest write triggers one mirror recovery read. Cross-namespace surfaces — the plugin-directory tab, the permission row (its dynamic enum lives in the namespace schema, which scopes deliberately do not carry), the models join, the agent-preset row's writability, and `hasDocument` — consume `ctx.settingsScope.describe()`, the shared read/fold face (`getSnapshot`/`subscribe`/`ensure`/`acceptView`).
+
+This decision updates the browser read and invalidation mechanics recorded by [Host-backed Web preferences](../bug-fix/2026-08-06-host-backed-web-preferences.md) and [plugin-owned settings surface](2026-08-12-plugin-owned-settings-surface.md), while preserving their preference-ownership and namespace-exposure decisions. It also replaces the direct settings-read description in [official DeepSeek first-run credential setup](../feature/2026-07-30-deepseek-onboarding-credential-setup.md); that join now derives its settings half from this mirror.
+
+The cold-boot budget is pinned at two reads by `apps/web/tests/startup-rpc-budget.e2e.ts`: the mirror's eager bind-time read, plus the first-connection reset read, which is kept deliberately — it closes the window where a document commit lands between the eager HTTP read and the SSE subscription and its invalidation is lost. The plan's original target of one read is unreachable without either accepting that lost-invalidation window or delaying the first read until after the SSE stream opens.
+
+## Alternatives considered
+
+- **Single-flight sharing inside `bind()` only** — deduplicates the concurrent bursts but keeps N direct readers, N subscription sets, and the revision skew; readers outside the binder (welcome, models, tab, permission) gain nothing. Rejected as treating the symptom.
+- **Boot-payload embedding** (host inlines the describe answer into the page boot) — saves the first read but adds a second acquisition path with its own staleness rules on top of the mirror it would still need. Deferred; it composes with the mirror if ever wanted.
+- **Per-namespace `settings.describe(ns)`** — shrinks each answer but keeps one read per consumer, so the fan-out and the growth rate stay. Rejected.
+- **One read (no first-reset re-read)** — reachable only by accepting the lost-invalidation window between the eager HTTP read and the SSE subscription, or by delaying the first read until the stream opens; both trade correctness or first-paint freshness for one loopback request. Rejected in favor of the pinned two.
+
+## Consequences
+
+- Startup `settings.describe` went 15 → 2, and a new preference-owning plugin adds zero reads.
+- Every derived surface shows the same document revision at any moment; the per-reader guards (`refreshWelcomeIfLoaded`, `refreshPermissionIfLoaded`, `refreshDocumentIfLoaded`) and their subscriptions are gone.
+- The mirror refreshes on every document commit regardless of namespace, so an external settings edit now costs one background read even while no settings surface is open — the price of surfaces that open already fresh. The per-namespace `ns !== spec.namespace` filters are gone with the per-scope subscriptions.
+- `credentials.describe` (3 startup calls), `agentPreset.list` (2), and `llm.providers` are separate sources and stay direct; the same mirror pattern fits them if they ever need it.
+- A new direct `settings.describe` caller in client code is a budget regression; the e2e's failure message says to grep for callers outside `ui-settings`.

.agents/notes/implemented/architecture/2026-08-17-settings-describe-mirror.zh.md

@@ -0,0 +1,34 @@
+# Agent Note：Settings describe 镜像
+
+Status: implemented
+
+[English](2026-08-17-settings-describe-mirror.md) | 中文
+
+## 问题
+
+一次冷启动的 web boot 在约 200ms 内发出十五次 `settings.describe`，且每新增一个持有偏好设置的客户端插件，该计数再加二。两个机制叠加：`SettingsScopeBinder.bind()` 为每个绑定的 scope 启动一次全量文档读取（产品组合中有六个 scope，外加插件目录 tab、welcome 门与 models onboarding join），而 `onConnected` 在**首次**连接时同样发出 `connection/reset`，于是上述每个读取方都立即重读了几毫秒前刚取到的应答。每个读取方还各自持有失效订阅与各自的 `refreshIfLoaded` 式防护，且十五次独立读取原则上可能落在十五个不同的文档 revision 上。
+
+## 决定
+
+**一个读取方，多个派生面。**`dsh-client-ui-settings` 持有 `SettingsDescribeMirror`——浏览器中唯一的 `settings.describe` 读取方：一个持有完整应答的快照 store，由所属插件的两个订阅（`settings/document-updated`、`connection/reset`）负责刷新。并发的 `load()` 调用折叠进在飞读取加至多一次尾随重读。在飞槽位会在 loading 发布同步重入 `load()` 之前先取得 run 的所有权，随后在 run 自身 try/finally 内、与读取 rerun 标志相同的同步段中清空；若把清理挂在返回 promise 的 `.finally()` 上，它要晚一个微任务执行，落入该间隙的刷新会标记一个无人读取的 rerun。
+
+`bind()` 返回的 `SettingsScope<T>` 面保持不变，但 controller 现在是镜像上的 selector：自身没有读路径，decode 规则不变，写队列保留。提交成功的写入把应答的 view 折回镜像（`acceptView`），兄弟 scope 无需重读即可看到新 revision；这次折叠会废弃更早发出的在飞应答，而首次完整文档尚未建立时到达的写入会让该读取重跑，不会把单个 namespace 发布成残缺文档。失败的最新写入触发一次镜像恢复读取。跨命名空间的表面——插件目录 tab、permission 行（其动态枚举位于命名空间 schema 中，而 scope 有意不携带 schema）、models join、agent-preset 行的可写性、以及 `hasDocument`——消费 `ctx.settingsScope.describe()` 提供的共享读／折叠面（`getSnapshot`／`subscribe`／`ensure`／`acceptView`）。
+
+本决策更新了[通过 Host settings 持久化 Web 用户偏好](../bug-fix/2026-08-06-host-backed-web-preferences.md)和[由插件自己拥有的设置表层](2026-08-12-plugin-owned-settings-surface.md)所记录的浏览器读取与失效机制，同时保留其中关于偏好所有权与命名空间暴露的决策。它也取代了 [DeepSeek 官方首次使用凭据配置](../feature/2026-07-30-deepseek-onboarding-credential-setup.md)中的设置直读描述；该联接的 settings 部分现在从本镜像派生。
+
+冷启动预算由 `apps/web/tests/startup-rpc-budget.e2e.ts` 钉在两次读取：镜像在绑定时的急切读取，加上首连 reset 触发的读取——后者是有意保留的：它关闭了「文档提交落在急切 HTTP 读取与 SSE 订阅之间、其失效通知丢失」的窗口。方案最初的一次读取目标，若不接受该失效丢失窗口、或不把首次读取推迟到 SSE 流建立之后，无法达成。
+
+## 考虑过的备选
+
+- **仅在 `bind()` 内做 single-flight 共享**——能去重并发风暴，但仍保留 N 个直连读取方、N 套订阅以及 revision 偏差；binder 之外的读取方（welcome、models、tab、permission）毫无受益。以治标为由否决。
+- **boot 载荷内嵌**（宿主把 describe 应答内联进页面 boot）——省下首次读取，却在镜像仍然需要的前提下增加第二条带自身陈旧规则的取数路径。推迟；若将来需要，它可与镜像叠加。
+- **按命名空间的 `settings.describe(ns)`**——缩小单次应答，但每个消费者仍各读一次，扇出与增长率原样保留。否决。
+- **一次读取（去掉首连 reset 重读）**——只有接受「急切 HTTP 读取与 SSE 订阅之间的失效丢失窗口」、或把首次读取推迟到流建立之后才可达成；两者都在用正确性或首屏新鲜度换一次环回请求。否决，保留钉住的两次。
+
+## 后果
+
+- 启动期 `settings.describe` 从 15 次降到 2 次，新增持有偏好设置的插件带来零次新增读取。
+- 任一时刻每个派生面看到的都是同一份文档 revision；各读取方的防护（`refreshWelcomeIfLoaded`、`refreshPermissionIfLoaded`、`refreshDocumentIfLoaded`）及其订阅随之消失。
+- 镜像对任何命名空间的文档提交都会刷新，因此在没有任何设置表面打开时，一次外部设置编辑现在也花费一次后台读取——这是「表面打开即新鲜」的代价。随着各 scope 订阅的删除，按命名空间的 `ns !== spec.namespace` 过滤一并消失。
+- `credentials.describe`（启动 3 次）、`agentPreset.list`（2 次）与 `llm.providers` 是另外的数据源，保持直连；若将来需要，同一镜像模式对它们同样适用。
+- 客户端代码中新增直连 `settings.describe` 调用即是预算回归；e2e 的失败信息会提示在 `ui-settings` 之外 grep 调用方。

.agents/notes/implemented/bug-fix/2026-08-06-host-backed-web-preferences.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/2026-08-06-host-backed-web-preferences.md
-2026-08-06-host-backed-web-preferences.md: 5d90f2be7c8b4030e9bdc00eed2769491ec009e5
-2026-08-06-host-backed-web-preferences.zh.md: c861c45bff299e06841165a2b36d0781e8f54d99
+2026-08-06-host-backed-web-preferences.md: 2e33d05417bf6c347a57b5c0b6c7281ff1392b5b
+2026-08-06-host-backed-web-preferences.zh.md: 1d3518bb33d334d89408916a5f5210a45b938a01

.agents/notes/implemented/bug-fix/2026-08-06-host-backed-web-preferences.md

@@ -12,9 +12,9 @@ The first theme implementation moved only Appearance to Host settings but awaite
 
 ## Decision
 
-The owning Host halves register three schemas: optional `locale.preference` (`zh` or `en`, where absence delegates to the browser), `ui-theme.preference` (`light`, `dark`, or `system`, default `system`), and `ui-conversation.busyEnter` (`queue` or `steer`, default `queue`). The local settings provider stores explicit choices in `$DSH_HOME/settings.yaml`, which resolves to `~/.dsh/settings.yaml` under the default home. The API proxy explicitly exposes all three namespaces beside the other Web settings; registration alone never crosses that configuration boundary.
+The owning Host halves register three schemas: optional `locale.preference` (`zh` or `en`, where absence delegates to the browser), `ui-theme.preference` (`light`, `dark`, or `system`, default `system`), and `ui-conversation.busyEnter` (`queue` or `steer`, default `queue`). The local settings provider stores explicit choices in `$DSH_HOME/settings.yaml`, which resolves to `~/.dsh/settings.yaml` under the default home. The API proxy serves every registered namespace to a loopback client; field roles still redact secrets.
 
-`dsh-client-ui-settings` provides `ctx.settingsScope.bind(spec)`, which owns one lifecycle per namespace as the browser mirror of the Host-side settings owner seam. It installs `settings/document-updated` and `connection/reset` listeners before starting a background initial read, so no settings transport can block plugin activation and an invalidation cannot fall into a read-before-subscribe gap, and it publishes a snapshot store (status, section value, revision, writability, host/memory mode) the domain service subscribes to. The default decoder validates each incoming section against the namespace's own serialized wire schema, rehydrated through the colocated `ctx.settingsSchema` service, so domains carry no hand-written wire guards. Domain services take the scope as an ordinary constructor collaborator, publish their provisional defaults immediately—browser-derived locale, system theme, and Queue—then adopt an accepted Host section without writing it back; a service constructed without a scope (standalone dictionary or policy fixtures) simply stays process-local.
+`dsh-client-ui-settings` owns one browser-wide settings describe mirror and provides `ctx.settingsScope.bind(spec)` as a per-namespace selector over it. The mirror installs `settings/document-updated` and `connection/reset` listeners before starting its background read, so no settings transport can block plugin activation and an invalidation cannot fall into a read-before-subscribe gap. Each bound scope publishes a snapshot store (status, section value, revision, writability, host/memory mode) the domain service subscribes to, without adding a wire read or listener of its own. The default decoder validates each incoming section against the namespace's own serialized wire schema, rehydrated through the colocated `ctx.settingsSchema` service, so domains carry no hand-written wire guards. Domain services take the scope as an ordinary constructor collaborator, publish their provisional defaults immediately—browser-derived locale, system theme, and Queue—then adopt an accepted Host section without writing it back; a service constructed without a scope (standalone dictionary or policy fixtures) simply stays process-local. The shared read and invalidation lifecycle is specified by the later [settings describe mirror decision](../architecture/2026-08-17-settings-describe-mirror.md).
 
 User changes update the live service synchronously and queue a `settings.mutate` path operation through `scope.set`. The scope serializes gestures, sends the latest known namespace revision as `expectedRevision`, records every successful revision, and lets only the latest write settlement republish live state. A rejected or failed latest write reloads Host state. Disposal rejects new work, skips queued operations, suppresses publication by the in-flight operation, and waits for that operation to settle before the plugin reaches quiescence.
 

.agents/notes/implemented/bug-fix/2026-08-06-host-backed-web-preferences.zh.md

@@ -12,9 +12,9 @@ Web 的 Appearance、Language 和繁忙态 Enter 偏好原本存在浏览器 `lo
 
 ## 决策
 
-各领域所属的 Host half 注册三份 schema：可选的 `locale.preference`（`zh` 或 `en`，缺失时交由浏览器决定）、`ui-theme.preference`（`light`、`dark` 或 `system`，默认为 `system`），以及 `ui-conversation.busyEnter`（`queue` 或 `steer`，默认为 `queue`）。本地 settings 提供方将显式选择存入 `$DSH_HOME/settings.yaml`，在使用默认 home 时，该路径解析为 `~/.dsh/settings.yaml`。API 代理会显式暴露这三个 namespace，与其他 Web settings 并列；仅注册它们，绝不会跨越该配置边界。
+各领域所属的 Host half 注册三份 schema：可选的 `locale.preference`（`zh` 或 `en`，缺失时交由浏览器决定）、`ui-theme.preference`（`light`、`dark` 或 `system`，默认为 `system`），以及 `ui-conversation.busyEnter`（`queue` 或 `steer`，默认为 `queue`）。本地 settings 提供方将显式选择存入 `$DSH_HOME/settings.yaml`，在使用默认 home 时，该路径解析为 `~/.dsh/settings.yaml`。API 代理会向回环客户端服务每一个已注册的 namespace；字段角色仍会脱敏机密值。
 
-`dsh-client-ui-settings` 提供 `ctx.settingsScope.bind(spec)`，为每个 namespace 持有一份生命周期，作为 Host 侧 settings owner seam 的浏览器镜像。它在开始后台初始读取之前安装 `settings/document-updated` 和 `connection/reset` 监听器，因此任何 settings 传输都不会阻塞插件激活，失效通知也不会掉入先读取、后订阅的空档；它还会发布一个供领域服务订阅的快照 store（状态、分节值、revision、可写性、host／内存模式）。默认解码器会对照该 namespace 自身的序列化 wire schema（经同包的 `ctx.settingsSchema` 服务还原）校验每个传入分节，因此各领域无需携带手写的 wire 校验器。领域服务把 scope 当作普通的构造函数协作者接收，立即发布各自的暂定默认值：由浏览器派生的 locale、系统主题和 Queue；随后采纳已获接受的 Host 分节，但不将其写回；不带 scope 构造的服务——独立词典或政策 fixture（测试前置数据）——则仅停留在进程本地。
+`dsh-client-ui-settings` 持有一个浏览器全局的 settings describe 镜像，并提供 `ctx.settingsScope.bind(spec)` 作为该镜像上的逐 namespace selector。镜像在开始后台读取之前安装 `settings/document-updated` 和 `connection/reset` 监听器，因此任何 settings 传输都不会阻塞插件激活，失效通知也不会掉入先读取、后订阅的空档。每个绑定的 scope 会发布一个供领域服务订阅的快照 store（状态、分节值、revision、可写性、host／内存模式），自身不再增加协议读取或监听器。默认解码器会对照该 namespace 自身的序列化 wire schema（经同包的 `ctx.settingsSchema` 服务还原）校验每个传入分节，因此各领域无需携带手写的 wire 校验器。领域服务把 scope 当作普通的构造函数协作者接收，立即发布各自的暂定默认值：由浏览器派生的 locale、系统主题和 Queue；随后采纳已获接受的 Host 分节，但不将其写回；不带 scope 构造的服务——独立词典或政策 fixture（测试前置数据）——则仅停留在进程本地。共享读取与失效生命周期由后续的 [settings describe 镜像决策](../architecture/2026-08-17-settings-describe-mirror.md)规定。
 
 用户变更会同步更新实时服务，并经 `scope.set` 将一项 `settings.mutate` 路径操作排入队列。scope 会串行处理手势，以最新已知 namespace revision 作为 `expectedRevision` 发送，记录每次成功写入的 revision，并且只允许最新写入的结算结果重新发布实时状态。最新写入被拒或失败时，scope 会重新加载 Host 状态。插件释放会拒绝新工作、跳过已排队操作、抑制运行中操作发布状态，并等待该操作结算后才让插件达到完全停稳。
 

.agents/notes/implemented/feature/2026-07-30-deepseek-onboarding-credential-setup.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/feature/2026-07-30-deepseek-onboarding-credential-setup.md
-2026-07-30-deepseek-onboarding-credential-setup.md: 823d10a723af70ec4ff51018b8b86198db0f5c29
-2026-07-30-deepseek-onboarding-credential-setup.zh.md: 7e8d79c23c4b1489bfd818c90558f36509635486
+2026-07-30-deepseek-onboarding-credential-setup.md: 87533e7a55f9b1f05f6a4ba58c3c9888780c158c
+2026-07-30-deepseek-onboarding-credential-setup.zh.md: 575d8232b4837b57d9508ed613530606c05db1f7

.agents/notes/implemented/feature/2026-07-30-deepseek-onboarding-credential-setup.md

@@ -10,7 +10,7 @@ The [web configuration plane](../architecture/2026-07-30-web-config-plane.md) ma
 
 ## Decision
 
-**One readiness projection owns both Models and onboarding facts.** `ui-settings-models` keeps a single store that joins `llm.providers({})`, redacted `settings.describe({})`, and batched `credentials.describe({refs})`. The onboarding projection selects the `deepseek-official` configurable-provider entry owned by the `llm-deepseek` namespace and empty settings path, reads the effective `apiKeyEnv`, and evaluates the matching credential descriptor. A live route with the same provider id but no matching configurable-provider declaration is adapter-absent for onboarding. A configured process-environment credential is ready and remains read-only.
+**One readiness projection owns both Models and onboarding facts.** `ui-settings-models` keeps a single store that joins `llm.providers({})`, the redacted namespace views held by the shared settings describe mirror, and batched `credentials.describe({refs})`. The onboarding projection selects the `deepseek-official` configurable-provider entry owned by the `llm-deepseek` namespace and empty settings path, reads the effective `apiKeyEnv`, and evaluates the matching credential descriptor. A live route with the same provider id but no matching configurable-provider declaration is adapter-absent for onboarding. A configured process-environment credential is ready and remains read-only. The later [settings describe mirror decision](../architecture/2026-08-17-settings-describe-mirror.md) owns that settings read and its invalidation ordering.
 
 **The settings shell contributes ordering, not provider policy.** `ui-settings` declares a root-scoped `settings.onboarding` list slot and mounts one ordered step at a time while the current surface is the empty Hero. The active registrant receives `complete()` and a private `openSection(id)` callback; completion transfers ownership to the next entry. `ui-settings-models` registers the DeepSeek step, the preceding welcome notice, and its Models section through `slots.inject()`, so every contribution follows one client Cordis plugin's lifecycle and the dialogs cannot stack. Their common presentation is owned by the [shared-modal onboarding decision](2026-08-13-shared-modal-product-onboarding.md).
 

.agents/notes/implemented/feature/2026-07-30-deepseek-onboarding-credential-setup.zh.md

@@ -10,7 +10,7 @@ Status: implemented
 
 ## 决策
 
-**Models 与首次使用引导共享同一个就绪状态投影。**`ui-settings-models` 维护一个 store，把 `llm.providers({})`、脱敏后的 `settings.describe({})` 和批量调用的 `credentials.describe({refs})` 联接为同一份状态。首次使用投影选取由 `llm-deepseek` namespace 与空 settings path 持有的 `deepseek-official` 可配置提供方条目，读取生效的 `apiKeyEnv`，并检查对应的凭据描述符。同 provider id 但没有匹配可配置提供方声明的存活路由，在首次使用引导中视为适配器缺失。通过进程环境提供的凭据若已配置，则判定为就绪并保持只读。
+**Models 与首次使用引导共享同一个就绪状态投影。**`ui-settings-models` 维护一个 store，把 `llm.providers({})`、共享 settings describe 镜像持有的已脱敏 namespace views 和批量调用的 `credentials.describe({refs})` 联接为同一份状态。首次使用投影选取由 `llm-deepseek` namespace 与空 settings path 持有的 `deepseek-official` 可配置提供方条目，读取生效的 `apiKeyEnv`，并检查对应的凭据描述符。同 provider id 但没有匹配可配置提供方声明的存活路由，在首次使用引导中视为适配器缺失。通过进程环境提供的凭据若已配置，则判定为就绪并保持只读。后续的 [settings describe 镜像决策](../architecture/2026-08-17-settings-describe-mirror.md)持有这次 settings 读取及其失效顺序。
 
 **设置外壳只贡献排序，不持有提供方策略。** `ui-settings` 声明一个根作用域的 `settings.onboarding` list slot，并在当前界面为空白 Hero 时，每次只挂载一个有序步骤。当前注册方会收到 `complete()` 和私有 `openSection(id)` 回调；完成当前步骤后，所有权转交给下一项。`ui-settings-models` 通过 `slots.inject()` 注册 DeepSeek 步骤、排在它之前的欢迎声明及 Models 分区，因此所有贡献都跟随同一个 client Cordis 插件的生命周期，两个弹窗也无法堆叠。它们的共用展示由[共用弹窗引导决策](2026-08-13-shared-modal-product-onboarding.md)持有。
 

apps/web/tests/startup-rpc-budget.e2e.ts

@@ -0,0 +1,54 @@
+// Cold-boot RPC budget. The describe mirror (packages/client/ui-settings) is
+// the one `settings.describe` reader in the browser, so startup describe
+// traffic stays bounded no matter how many client plugins own a preference.
+// A regression here means a consumer bypassed the mirror — grep for
+// `settings.describe(` outside ui-settings' client sources.
+//
+// Zero model calls: the lane only boots chrome, so no replay fixture mounts.
+import type { Browser, Page } from 'playwright'
+import { chromium } from 'playwright'
+import { afterAll, beforeAll, describe, expect, it } from 'vitest'
+import { launchWebScaffold, watchConsole, type WebScaffold } from './scaffold.ts'
+import { newEnglishPage } from './support.ts'
+
+/**
+ * Both reads are the mirror's: once eagerly at bind time over HTTP, and once
+ * on the first-connection reset — that second read closes the window where a
+ * document commit lands between the eager read and the SSE subscription and
+ * its invalidation is lost. Every settings consumer derives from these two.
+ */
+const DESCRIBE_BUDGET = 2
+
+let scaffold: WebScaffold
+let browser: Browser
+let page: Page
+
+beforeAll(async () => {
+  scaffold = await launchWebScaffold()
+  browser = await chromium.launch()
+})
+
+afterAll(async () => {
+  await page?.close()
+  await browser?.close()
+  await scaffold?.close()
+})
+
+describe('startup RPC budget', () => {
+  it('keeps cold-boot settings.describe at the mirror count', async () => {
+    page = await newEnglishPage(browser)
+    watchConsole(page)
+    const calls: string[] = []
+    page.on('request', (request) => {
+      const url = new URL(request.url())
+      if (url.pathname.startsWith('/api/')) calls.push(url.pathname.slice('/api/'.length))
+    })
+    await page.goto(scaffold.baseUrl)
+    // Boot settles when the workspace picker is interactive; the trailing wait
+    // absorbs the first-connection reset wave the budget must include.
+    await page.getByRole('textbox', { name: 'Choose workspace' }).waitFor({ timeout: 30_000 })
+    await page.waitForTimeout(3000)
+    const describeCount = calls.filter(method => method === 'settings.describe').length
+    expect(describeCount, `startup /api calls:\n${calls.join('\n')}`).toBe(DESCRIBE_BUDGET)
+  })
+})

apps/web/tsconfig.json

@@ -24,6 +24,7 @@
   "exclude": [
     "tests/scaffold.ts",
     "tests/scaffold-hermetic.e2e.ts",
+    "tests/startup-rpc-budget.e2e.ts",
     "tests/minimal-preset.snapshot.ts",
     "tests/message-feedback-protocol.snapshot.ts",
     "tests/live-interactions.e2e.ts",

packages/client/locale/tests/apply.client.spec.ts

@@ -4,8 +4,7 @@
 import { Context } from '@deepseek-ai/cordis'
 import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest'
 import { SlotRegistry } from '@deepseek-ai/dsh-client-runtime/client'
-import { SettingsSchemaService } from '@deepseek-ai/dsh-client-ui-settings/src/client/schema.ts'
-import { SettingsScopeBinder } from '@deepseek-ai/dsh-client-ui-settings/src/client/settings-scope.ts'
+import { apply as settingsApply, inject as settingsInject } from '@deepseek-ai/dsh-client-ui-settings/client'
 import { TestRemote } from '@deepseek-ai/dsh-client-test-runtime'
 import {
   apply, inject, SETTINGS_NS,
@@ -48,7 +47,7 @@ async function bench() {
   ctx.provide('connection', { api: { settings: { describe, mutate } }, isLoopback: true } as never)
   // The settings transport and the forwarded-event port the plugin injects.
   new TestRemote(ctx)
-  await ctx.plugin(SettingsScopeBinder, new SettingsSchemaService(ctx)).await()
+  await ctx.plugin({ inject: [...settingsInject], apply: settingsApply }).await()
   return {
     ctx, slots: ctx.get('slots') as SlotRegistry, describe, mutate,
     setHostPreference: (next: string | undefined) => { preference = next; revision += 1 },
@@ -134,7 +133,10 @@ describe('locale apply', () => {
 
   it('loads and refreshes the explicit Host preference after nonblocking activation', async () => {
     const b = await bench()
+    // The shared mirror read once at bench time; a Host-side change reaches it
+    // through the document invalidation, exactly as production announces one.
     b.setHostPreference('en')
+    b.ctx.remote.$dispatch('settings/document-updated', [LOCALE_SETTINGS_NAMESPACE, 0])
     declareItems(b.slots)
     await b.ctx.plugin({ inject: [...inject], apply }).await()
     const locale = b.ctx.get('locale') as LocaleRuntime
@@ -145,7 +147,7 @@ describe('locale apply', () => {
     b.setHostPreference('en')
     b.ctx.remote.$dispatch('settings/document-updated', [LOCALE_SETTINGS_NAMESPACE, 0])
     await vi.waitFor(() => { expect(locale.getLocale().active).toBe('en') })
-    expect(b.describe).toHaveBeenCalledTimes(3)
+    expect(b.describe).toHaveBeenCalledTimes(4)
   })
 
   it('recovers after an HMR collapse of the declaring entry (stale disposer must not block)', async () => {

packages/client/ui-agent-preset/src/client/index.ts

@@ -46,7 +46,7 @@ export type { AgentPresetOption, AgentPresetSettingsState } from './settings-sto
 export { AGENT_PRESET_SETTINGS_NS, writeDefaultPreset } from './settings-store.ts'
 
 /** Required services (cordis fiber inject). */
-export const inject = ['slots', 'locale', 'connection', 'remote']
+export const inject = ['slots', 'locale', 'connection', 'remote', 'settingsScope']
 
 /**
  * Mount the General-settings row.
@@ -54,7 +54,7 @@ export const inject = ['slots', 'locale', 'connection', 'remote']
  */
 export function apply(ctx: ClientContext): void {
   const { api } = ctx.get('connection') as ConnectionHandle
-  const controller = new AgentPresetSettingsController(api)
+  const controller = new AgentPresetSettingsController(api, ctx.settingsScope.describe())
   // One roster, four surfaces. The chip is registered in a later scope, so it
   // subscribes here rather than being reached from this one.
   const rosterReaders = new Set<() => void>()

packages/client/ui-agent-preset/src/client/settings-store.ts

@@ -9,6 +9,7 @@
 
 import type { IApiClient } from '@deepseek-ai/dsh-api-remotes/client'
 import { createSnapshotStore, type SnapshotStore } from '@deepseek-ai/dsh-client-runtime/client'
+import type { SettingsDescribeFace } from '@deepseek-ai/dsh-client-ui-settings/client'
 
 /** The agent-preset settings namespace on the host wire. */
 export const AGENT_PRESET_SETTINGS_NS = 'agent-presets'
@@ -191,7 +192,14 @@ export class AgentPresetSettingsController {
   /** Row snapshot the renderer subscribes to. */
   readonly store: SnapshotStore<AgentPresetSettingsState> = createSnapshotStore(INITIAL)
 
-  constructor(private readonly api: IApiClient) {}
+  /**
+   * @param api - the agent-preset and settings wire faces (roster and default write).
+   * @param describeFace - the shared mirror's describe face (writability source).
+   */
+  constructor(
+    private readonly api: IApiClient,
+    private readonly describeFace: SettingsDescribeFace,
+  ) {}
 
   private set(patch: Partial<AgentPresetSettingsState>): void {
     this.store.set({ ...this.store.getSnapshot(), ...patch })
@@ -212,24 +220,20 @@ export class AgentPresetSettingsController {
       this.set({ status: 'unavailable', options: [], currentValue: '' })
       return
     }
-    try {
-      // The roster says what may be chosen; `settings.describe` says whether
-      // this browser may write the choice down. A non-loopback browser reaches
-      // neither method, so a refused describe leaves the row read-only rather
-      // than offering a control whose write the Host would refuse.
-      const described = await this.api.settings.describe({})
-      this.set({
-        status: 'ready',
-        error: null,
-        writable: described.result.ok && described.result.value.writable,
-        options: presetOptions(presets),
-        // A roster can mark nothing default: settings can name a preset that
-        // was since deleted, and the picker still has to show something.
-        currentValue: presets.find(preset => preset.isDefault)?.id ?? first.id,
-      })
-    } catch (error) {
-      this.set({ status: 'error', error: messageOf(error) })
-    }
+    // The roster says what may be chosen; the shared mirror says whether this
+    // browser may write the choice down. A non-loopback browser's mirror never
+    // answers, so the row stays read-only rather than offering a control
+    // whose write the Host would refuse.
+    await this.describeFace.ensure()
+    this.set({
+      status: 'ready',
+      error: null,
+      writable: this.describeFace.getSnapshot().view?.writable ?? false,
+      options: presetOptions(presets),
+      // A roster can mark nothing default: settings can name a preset that
+      // was since deleted, and the picker still has to show something.
+      currentValue: presets.find(preset => preset.isDefault)?.id ?? first.id,
+    })
   }
 
   /**

packages/client/ui-agent-preset/tests/apply.client.spec.ts

@@ -11,6 +11,7 @@ import { resolveSlotLabel } from '@deepseek-ai/dsh-client-ui-slots'
 import { SlotRegistry } from '@deepseek-ai/dsh-client-runtime/client'
 import { LocaleRuntime } from '@deepseek-ai/dsh-client-locale/client'
 import { TestRemote, usePinnedBrowserLanguages } from '@deepseek-ai/dsh-client-test-runtime'
+import { apply as settingsApply, inject as settingsInject } from '@deepseek-ai/dsh-client-ui-settings/client'
 import { apply, inject } from '@deepseek-ai/dsh-client-ui-agent-preset/client'
 import { AgentPresetLabel } from '../src/client/AgentPresetLabel.tsx'
 import type { AgentPresetLabelInjected } from '../src/client/AgentPresetLabel.tsx'
@@ -117,6 +118,7 @@ async function bench() {
       },
     },
   } as never)
+  await ctx.plugin({ inject: [...settingsInject], apply: settingsApply }).await()
   return { ctx, slots: ctx.get('slots') as SlotRegistry, calls, moveDefault }
 }
 
@@ -178,7 +180,7 @@ function sessionsDouble(state: {
 
 describe('ui-agent-preset apply', () => {
   it('declares the services it uses', () => {
-    expect(inject).toEqual(['slots', 'locale', 'connection', 'remote'])
+    expect(inject).toEqual(['slots', 'locale', 'connection', 'remote', 'settingsScope'])
   })
 
   it('registers the General row and the settings section', async () => {

packages/client/ui-agent-preset/tests/settings-store.client.spec.ts

@@ -7,9 +7,15 @@
 
 import { describe, expect, it } from 'vitest'
 import type { IApiClient } from '@deepseek-ai/dsh-api-remotes/client'
+import { SettingsDescribeMirror } from '@deepseek-ai/dsh-client-ui-settings/src/client/settings-mirror.ts'
 import {
   AGENT_PRESET_SETTINGS_NS, AgentPresetSettingsController, messageOf,
 } from '../src/client/settings-store.ts'
+
+/** Controller over a real mirror derived from the same fake wire. */
+function derivedController(api: IApiClient) {
+  return new AgentPresetSettingsController(api, new SettingsDescribeMirror(api))
+}
 import { AgentPresetSeatController } from '../src/client/seat-store.ts'
 import type { SeatSessionSummary } from '../src/client/seat-store.ts'
 
@@ -60,7 +66,7 @@ function fakeApi(
 
 describe('the agent-preset settings controller', () => {
   it('disables the control when this browser may not write settings', async () => {
-    const controller = new AgentPresetSettingsController(fakeApi([
+    const controller = derivedController(fakeApi([
       { id: 'standard', trust: 'system', isDefault: true },
     ], { readOnly: true }))
 
@@ -74,7 +80,7 @@ describe('the agent-preset settings controller', () => {
   })
 
   it('derives options and the current default from one roster call', async () => {
-    const controller = new AgentPresetSettingsController(fakeApi([
+    const controller = derivedController(fakeApi([
       { id: 'standard', trust: 'system', isDefault: true },
       { id: 'mine', trust: 'user', isDefault: false },
     ]))
@@ -91,7 +97,7 @@ describe('the agent-preset settings controller', () => {
   })
 
   it('offers no broken preset: the pickers choose the NEXT session\'s composition', async () => {
-    const controller = new AgentPresetSettingsController(fakeApi([
+    const controller = derivedController(fakeApi([
       { id: 'standard', trust: 'system', isDefault: true },
       { id: 'damaged', trust: 'user', isDefault: false, broken: 'the composition is not valid YAML' },
     ] as never))
@@ -105,7 +111,7 @@ describe('the agent-preset settings controller', () => {
   })
 
   it('carries the display metadata a preset published', async () => {
-    const controller = new AgentPresetSettingsController(fakeApi([
+    const controller = derivedController(fakeApi([
       { id: 'standard', trust: 'system', isDefault: true, name: '标准模式', description: '完整的编码 agent。' },
     ] as never))
 
@@ -119,7 +125,7 @@ describe('the agent-preset settings controller', () => {
   })
 
   it('reports an empty roster as unavailable, not as an error', async () => {
-    const controller = new AgentPresetSettingsController(fakeApi([]))
+    const controller = derivedController(fakeApi([]))
 
     await controller.load()
 
@@ -131,7 +137,7 @@ describe('the agent-preset settings controller', () => {
 
   it('writes only the default field, into the agent-presets namespace', async () => {
     const writes: Recorded[] = []
-    const controller = new AgentPresetSettingsController(fakeApi([
+    const controller = derivedController(fakeApi([
       { id: 'standard', trust: 'system', isDefault: true },
       { id: 'minimal', trust: 'system', isDefault: false },
     ], { writes }))
@@ -144,7 +150,7 @@ describe('the agent-preset settings controller', () => {
   })
 
   it('restores the previous value and surfaces the message when the write fails', async () => {
-    const controller = new AgentPresetSettingsController(fakeApi([
+    const controller = derivedController(fakeApi([
       { id: 'standard', trust: 'system', isDefault: true },
       { id: 'minimal', trust: 'system', isDefault: false },
     ], { failWrite: 'read-only settings' }))
@@ -160,7 +166,7 @@ describe('the agent-preset settings controller', () => {
 
   it('ignores a pick that is already the default', async () => {
     const writes: Recorded[] = []
-    const controller = new AgentPresetSettingsController(fakeApi([
+    const controller = derivedController(fakeApi([
       { id: 'standard', trust: 'system', isDefault: true },
     ], { writes }))
     await controller.load()
@@ -171,7 +177,7 @@ describe('the agent-preset settings controller', () => {
   })
 
   it('surfaces a roster failure without claiming the deployment has no presets', async () => {
-    const controller = new AgentPresetSettingsController(fakeApi([], { failList: 'host down' }))
+    const controller = derivedController(fakeApi([], { failList: 'host down' }))
 
     await controller.load()
 
@@ -183,7 +189,7 @@ describe('the agent-preset settings controller', () => {
   it('shows the first preset when the roster marks none default', async () => {
     // Settings can name a preset that was since deleted; the picker still has
     // to show something rather than an empty control.
-    const controller = new AgentPresetSettingsController(fakeApi([
+    const controller = derivedController(fakeApi([
       { id: 'standard', trust: 'system', isDefault: false },
       { id: 'mine', trust: 'user', isDefault: false },
     ]))
@@ -195,7 +201,7 @@ describe('the agent-preset settings controller', () => {
 
   it('ignores a load while one is already in flight', async () => {
     const writes: Recorded[] = []
-    const controller = new AgentPresetSettingsController(fakeApi(
+    const controller = derivedController(fakeApi(
       [{ id: 'standard', trust: 'system', isDefault: true }], { writes }))
 
     await Promise.all([controller.load(), controller.load()])
@@ -211,7 +217,7 @@ describe('the agent-preset settings controller', () => {
   })
 
   it('reports a transport that rejects rather than answering', async () => {
-    const controller = new AgentPresetSettingsController({
+    const controller = derivedController({
       agentPresets: { list: () => Promise.reject(new Error('socket closed')) },
     } as unknown as IApiClient)
 
@@ -221,7 +227,7 @@ describe('the agent-preset settings controller', () => {
   })
 
   it('reports a transport that rejects mid-write and keeps the old default showing', async () => {
-    const controller = new AgentPresetSettingsController(fakeApi([
+    const controller = derivedController(fakeApi([
       { id: 'standard', trust: 'system', isDefault: true },
       { id: 'mine', trust: 'user', isDefault: false },
     ], { failWriteWith: new Error('socket closed') }))
@@ -434,7 +440,7 @@ describe('the new-session chip controller', () => {
     expect(controller.store.getSnapshot().error).toBe('socket closed')
   })
 
-  it('reports a refused describe as a failure rather than a half-read row', async () => {
+  it('degrades to a read-only row while the mirror holds no answer', async () => {
     const api = {
       agentPresets: {
         list: () => Promise.resolve({
@@ -442,16 +448,19 @@ describe('the new-session chip controller', () => {
           result: { ok: true as const, value: { presets: [{ id: 'standard', trust: 'system', isDefault: true }], authorable: true } },
         }),
       },
-      // The roster answered; `settings.describe` is what rejected, and the row
-      // cannot claim a writable default it never confirmed.
+      // The roster answered; the mirror's read is what failed, so the row
+      // shows the current default without offering a write it never confirmed.
       settings: { describe: () => Promise.reject(new Error('socket closed')) },
     } as unknown as IApiClient
-    const controller = new AgentPresetSettingsController(api)
+    const controller = derivedController(api)
 
     await controller.load()
 
-    expect(controller.store.getSnapshot().status).toBe('error')
-    expect(controller.store.getSnapshot().error).toBe('socket closed')
+    expect(controller.store.getSnapshot()).toMatchObject({
+      status: 'ready',
+      writable: false,
+      currentValue: 'standard',
+    })
   })
 
 

packages/client/ui-permission-presets/src/client/index.ts

@@ -33,9 +33,7 @@ import {
 import {
   displayPermissionPreset, FULL_ACCESS_PRESET,
 } from './presentation.ts'
-import {
-  PERMISSION_SETTINGS_NS, PermissionPresetSettingsController, refreshPermissionIfLoaded,
-} from './settings-store.ts'
+import { PermissionPresetSettingsController } from './settings-store.ts'
 
 export type { PermissionRowInjected, PermissionRowProps } from './PermissionRow.tsx'
 export type {
@@ -43,7 +41,7 @@ export type {
 } from './settings-store.ts'
 
 /** Required services (cordis fiber inject). */
-export const inject = ['commandUi', 'sessions', 'slots', 'locale', 'connection', 'remote', 'settingsSchema']
+export const inject = ['commandUi', 'sessions', 'slots', 'locale', 'connection', 'remote', 'settingsScope', 'settingsSchema']
 
 const ACCESS_NS = 'permission.access'
 
@@ -113,7 +111,10 @@ export function apply(ctx: ClientContext): void {
   ctx.effect(() => ctx.locale.register('settings.permission', { zh, en }), 'ui-permission: settings row dictionaries')
 
   const connection = ctx.get('connection') as ConnectionHandle
-  const controller = new PermissionPresetSettingsController(connection.api, ctx.settingsSchema)
+  // The row follows the shared describe mirror, whose owning plugin already
+  // refreshes it on document commits and reconnects.
+  const controller = new PermissionPresetSettingsController(
+    ctx.settingsScope.describe(), connection.api, ctx.settingsSchema)
   const load = (): Promise<void> => controller.load()
   const select = (preset: string): Promise<void> => controller.select(preset)
   const injected = (): PermissionRowInjected => ({
@@ -122,20 +123,7 @@ export function apply(ctx: ClientContext): void {
     select,
   })
 
-  ctx.effect(() => {
-    const refresh = (): void => { refreshPermissionIfLoaded(controller) }
-    const disposers = [
-      ctx.remote.$on('settings/document-updated', (ns) => {
-        if (ns !== PERMISSION_SETTINGS_NS) return
-        refresh()
-      }),
-      ctx.on('connection/reset', () => { refresh() }),
-    ]
-    return () => {
-      controller.dispose()
-      for (const dispose of disposers) dispose()
-    }
-  }, 'ui-permission: settings invalidations')
+  ctx.effect(() => () => { controller.dispose() }, 'ui-permission: settings row directory')
 
   ctx.slots.inject('settings.general.item', () => ctx.slots.register({
     name: 'settings.general.item',

packages/client/ui-permission-presets/src/client/settings-store.ts

@@ -1,7 +1,9 @@
 /**
- * Permission default-settings controller. The host descriptor supplies the
- * current value and the dynamic preset enum; writes target only
- * `defaultPreset` and carry the descriptor revision.
+ * Permission default-settings controller. The permission descriptor comes
+ * from the shared describe mirror (the dynamic preset enum lives in the
+ * namespace schema, which per-namespace scopes do not carry); writes target
+ * only `defaultPreset`, carry the descriptor revision, and fold their answer
+ * back into the mirror.
  */
 
 import type {
@@ -10,7 +12,9 @@ import type {
 import {
   createSnapshotStore, type SnapshotStore,
 } from '@deepseek-ai/dsh-client-runtime/client'
-import type { SchemaNode, SettingsSchemaService } from '@deepseek-ai/dsh-client-ui-settings/client'
+import type {
+  SchemaNode, SettingsDescribeFace, SettingsSchemaService,
+} from '@deepseek-ai/dsh-client-ui-settings/client'
 import { displayPermissionPreset } from './presentation.ts'
 
 /** Permission's settings namespace on the host wire. */
@@ -74,7 +78,7 @@ export function permissionDefaultOf(view: SettingsNamespaceView, schema: Setting
   return { currentValue: value, options }
 }
 
-/** Controller joining Settings reads, writes, and pushed invalidations. */
+/** Controller deriving the row from the shared mirror and writing the default through it. */
 export class PermissionPresetSettingsController {
   /** Row snapshot consumed through a bound selector hook. */
   readonly store: SnapshotStore<PermissionSettingsState> = createSnapshotStore({
@@ -86,57 +90,50 @@ export class PermissionPresetSettingsController {
     revision: 0,
   })
 
-  private generation = 0
-  private view: SettingsNamespaceView | undefined
+  private following: (() => void) | undefined
+  private saving = false
+  private disposed = false
 
-  /** @param api - Settings wire face. */
+  /**
+   * @param describeFace - the shared mirror's read/fold face (descriptor and schema source).
+   * @param api - settings wire face for the `defaultPreset` write.
+   * @param schema - settings-owned schema operations.
+   */
   constructor(
+    private readonly describeFace: SettingsDescribeFace,
     private readonly api: Pick<IApiClient, 'settings'>,
     private readonly schema: SettingsSchemaService,
   ) {}
 
   /**
-   * Refresh the permission descriptor. Latest request wins.
-   * @returns nothing; {@link store} carries success or failure.
+   * Begin following the mirror (idempotent) and reflect its current answer.
+   * @returns settlement once the snapshot reflects the mirror.
    */
   async load(): Promise<void> {
-    const generation = ++this.generation
+    if (this.disposed) return
+    this.following ??= this.describeFace.subscribe(() => { this.derive() })
     this.store.update((state) => {
       state.status = 'loading'
       state.error = null
     })
-    try {
-      const response = await this.api.settings.describe({})
-      if (!response.result.ok) throw new Error(response.result.error.message)
-      if (generation !== this.generation) return
-      const view = response.result.value.namespaces.find(entry => entry.ns === PERMISSION_SETTINGS_NS)
-      if (view === undefined) {
-        this.view = undefined
-        this.store.update((state) => {
-          state.status = 'unavailable'
-          state.writable = false
-          state.currentValue = ''
-          state.options = []
-        })
-        return
-      }
-      this.accept(view, response.result.value.writable)
-    } catch (error) {
-      if (generation !== this.generation) return
-      this.fail(error)
-    }
+    await this.describeFace.ensure()
+    this.derive()
   }
 
   /**
    * Persist one preset as the default for subsequently created sessions.
+   * A selection made while one is already saving is ignored — the row's
+   * control is disabled during the save, so this only drops programmatic
+   * double-submits rather than user intent.
    * @param preset - advertised preset key.
    * @returns nothing; {@link store} carries success or failure.
    */
   async select(preset: string): Promise<void> {
-    const view = this.view
     const state = this.store.getSnapshot()
-    if (view === undefined || !state.writable) return
-    const generation = ++this.generation
+    const view = this.describeFace.getSnapshot().view?.namespaces
+      .find(entry => entry.ns === PERMISSION_SETTINGS_NS)
+    if (view === undefined || !state.writable || this.saving) return
+    this.saving = true
     this.store.update((draft) => {
       draft.status = 'saving'
       draft.error = null
@@ -147,32 +144,70 @@ export class PermissionPresetSettingsController {
         ops: [{ op: 'set', path: ['defaultPreset'], value: preset }],
         expectedRevision: view.revision,
       })
-      if (generation !== this.generation) return
       if (!response.result.ok) throw new Error(response.result.error.message)
-      this.accept(response.result.value, true)
+      this.saving = false
+      if (this.disposed) return
+      // The mirror publish reaches this row's own subscription, so the fold
+      // is also what republishes the accepted value here.
+      this.describeFace.acceptView(response.result.value)
     } catch (error) {
-      if (generation !== this.generation) return
+      this.saving = false
+      if (this.disposed) return
       this.fail(error)
     }
   }
 
-  /** Stop in-flight responses from publishing after plugin disposal. */
+  /** Stop following the mirror; later publishes leave the snapshot alone. */
   dispose(): void {
-    this.generation += 1
-    this.view = undefined
+    this.disposed = true
+    this.following?.()
+    this.following = undefined
   }
 
-  private accept(view: SettingsNamespaceView, writable: boolean): void {
-    const resolved = permissionDefaultOf(view, this.schema)
-    this.view = view
-    this.store.update((state) => {
-      state.status = 'ready'
-      state.error = null
-      state.writable = writable
-      state.currentValue = resolved.currentValue
-      state.options = resolved.options
-      state.revision = view.revision
-    })
+  private derive(): void {
+    if (this.disposed || this.saving) return
+    const mirrored = this.describeFace.getSnapshot()
+    if (mirrored.status === 'unavailable') {
+      // The terminal non-loopback state: settings RPCs are loopback-only, so
+      // the row hides itself exactly like an unserved namespace.
+      this.store.update((state) => {
+        state.status = 'unavailable'
+        state.writable = false
+        state.currentValue = ''
+        state.options = []
+      })
+      return
+    }
+    if (mirrored.view === undefined) {
+      // A held failure with no answer is a failed row; without one the read
+      // is still in flight and the row keeps its loading state.
+      if (mirrored.error !== null) this.fail(new Error(mirrored.error))
+      return
+    }
+    const view = mirrored.view.namespaces.find(entry => entry.ns === PERMISSION_SETTINGS_NS)
+    if (view === undefined) {
+      this.store.update((state) => {
+        state.status = 'unavailable'
+        state.writable = false
+        state.currentValue = ''
+        state.options = []
+      })
+      return
+    }
+    try {
+      const resolved = permissionDefaultOf(view, this.schema)
+      const { writable } = mirrored.view
+      this.store.update((state) => {
+        state.status = 'ready'
+        state.error = null
+        state.writable = writable
+        state.currentValue = resolved.currentValue
+        state.options = resolved.options
+        state.revision = view.revision
+      })
+    } catch (error) {
+      this.fail(error)
+    }
   }
 
   private fail(error: unknown): void {
@@ -182,12 +217,3 @@ export class PermissionPresetSettingsController {
     })
   }
 }
-
-/**
- * Refetch only after the row has opened once.
- * @param controller - permission settings controller.
- */
-export function refreshPermissionIfLoaded(controller: PermissionPresetSettingsController): void {
-  if (controller.store.getSnapshot().status === 'idle') return
-  void controller.load()
-}

packages/client/ui-permission-presets/tests/browser-plugin.client.spec.ts

@@ -13,8 +13,8 @@ import { describe, expect, it } from 'vitest'
 import { SlotRegistry, type SessionId } from '@deepseek-ai/dsh-client-runtime/client'
 import { LocaleRuntime } from '@deepseek-ai/dsh-client-locale/client'
 import { TestRemote } from '@deepseek-ai/dsh-client-test-runtime'
+import { apply as settingsApply, inject as settingsInject } from '@deepseek-ai/dsh-client-ui-settings/client'
 import type { CommandDecoration } from '@deepseek-ai/dsh-client-ui-commands/client'
-import { SettingsSchemaService } from '@deepseek-ai/dsh-client-ui-settings/src/client/schema.ts'
 import type { PermissionSelect } from '@deepseek-ai/dsh-permission-presets/client'
 import {
   PermissionRow, type PermissionRowInjected,
@@ -42,7 +42,6 @@ async function bench() {
   // The plugin injects `remote`; forwarded events reach it through the same
   // `$dispatch` handoff the connection sink makes.
   new TestRemote(ctx)
-  new SettingsSchemaService(ctx)
   ctx.slots.register({
     name: 'root',
     children: {
@@ -60,6 +59,7 @@ async function bench() {
       },
     },
   } as never)
+  await ctx.plugin({ inject: [...settingsInject], apply: settingsApply }).await()
   let decoration: CommandDecoration | undefined
   ctx.provide('commandUi', {
     decorate(c: CommandDecoration) {

packages/client/ui-permission-presets/tests/permission-presets-row.client.spec.tsx

@@ -7,8 +7,17 @@ import type { SettingsNamespaceView } from '@deepseek-ai/dsh-api-remotes/client'
 import { SettingsSchemaService } from '@deepseek-ai/dsh-client-ui-settings/src/client/schema.ts'
 import { PermissionRow, type PermissionRowProps } from '../src/client/PermissionRow.tsx'
 import { en } from '../src/client/locales.ts'
+import { SettingsDescribeMirror } from '@deepseek-ai/dsh-client-ui-settings/src/client/settings-mirror.ts'
 import { PermissionPresetSettingsController } from '../src/client/settings-store.ts'
 
+const schema = new SettingsSchemaService(new Context())
+
+/** Controller over a real mirror derived from the same fake wire. */
+function derivedController(api: { settings: object }) {
+  const wire = api as never
+  return new PermissionPresetSettingsController(new SettingsDescribeMirror(wire), wire, schema)
+}
+
 afterEach(cleanup)
 
 const SCHEMA = {
@@ -22,12 +31,6 @@ const SCHEMA = {
   },
 }
 
-const schema = new SettingsSchemaService(new Context())
-
-function createController(api: ConstructorParameters<typeof PermissionPresetSettingsController>[0]) {
-  return new PermissionPresetSettingsController(api, schema)
-}
-
 function view(defaultPreset: string, revision = 0): SettingsNamespaceView {
   return {
     ns: 'permission',
@@ -66,11 +69,11 @@ function mount(controller: PermissionPresetSettingsController) {
 describe('PermissionRow', () => {
   it('loads the descriptor, opens the menu, and selects a new default', async () => {
     const mutate = vi.fn(() => Promise.resolve(ok(view('workspace-write', 1))))
-    const controller = createController({
+    const controller = derivedController({
       settings: {
         describe: () => Promise.resolve(ok({ writable: true, hasDocument: false, namespaces: [view('read-only')] })),
         mutate,
-      } as never,
+      },
     })
     mount(controller)
     const button = await screen.findByRole('button', { name: 'Read Only' })
@@ -93,11 +96,11 @@ describe('PermissionRow', () => {
 
   it('requires explicit acknowledgement before saving Full access', async () => {
     const mutate = vi.fn(() => Promise.resolve(ok(view('danger-full-access', 1))))
-    const controller = createController({
+    const controller = derivedController({
       settings: {
         describe: () => Promise.resolve(ok({ writable: true, hasDocument: false, namespaces: [view('read-only')] })),
         mutate,
-      } as never,
+      },
     })
     mount(controller)
     fireEvent.click(await screen.findByRole('button', { name: 'Read Only' }))
@@ -117,21 +120,21 @@ describe('PermissionRow', () => {
   })
 
   it('hides an unavailable namespace and disables a read-only provider', async () => {
-    const absent = createController({
+    const absent = derivedController({
       settings: {
         describe: () => Promise.resolve(ok({ writable: true, hasDocument: false, namespaces: [] })),
         mutate: vi.fn(),
-      } as never,
+      },
     })
     const rendered = mount(absent)
     await waitFor(() => { expect(rendered.container.textContent).toBe('') })
     rendered.unmount()
 
-    const readonly = createController({
+    const readonly = derivedController({
       settings: {
         describe: () => Promise.resolve(ok({ writable: false, hasDocument: false, namespaces: [view('read-only')] })),
         mutate: vi.fn(),
-      } as never,
+      },
     })
     mount(readonly)
     expect((await screen.findByRole('button', { name: 'Read Only' })).hasAttribute('disabled')).toBe(true)
@@ -142,7 +145,7 @@ describe('PermissionRow', () => {
       writable: boolean
       namespaces: SettingsNamespaceView[]
     }>>>()
-    const controller = createController({
+    const controller = derivedController({
       settings: {
         describe: () => describe.promise,
         mutate: () => Promise.resolve({
@@ -152,7 +155,7 @@ describe('PermissionRow', () => {
             error: { code: 'settings-conflict', message: 'changed elsewhere', details: {} },
           },
         }),
-      } as never,
+      },
     })
     mount(controller)
     expect((await screen.findByRole('button', { name: 'Loading' })).hasAttribute('disabled')).toBe(true)

packages/client/ui-permission-presets/tests/settings-store.client.spec.ts

@@ -2,8 +2,9 @@ import { Context } from '@deepseek-ai/cordis'
 import { describe, expect, it, vi } from 'vitest'
 import type { SettingsNamespaceView } from '@deepseek-ai/dsh-api-remotes/client'
 import { SettingsSchemaService } from '@deepseek-ai/dsh-client-ui-settings/src/client/schema.ts'
+import { SettingsDescribeMirror } from '@deepseek-ai/dsh-client-ui-settings/src/client/settings-mirror.ts'
 import {
-  PermissionPresetSettingsController, permissionDefaultOf, refreshPermissionIfLoaded,
+  PermissionPresetSettingsController, permissionDefaultOf,
 } from '../src/client/settings-store.ts'
 
 const SCHEMA = {
@@ -22,10 +23,6 @@ function resolveDefault(view: SettingsNamespaceView) {
   return permissionDefaultOf(view, schema)
 }
 
-function createController(api: ConstructorParameters<typeof PermissionPresetSettingsController>[0]) {
-  return new PermissionPresetSettingsController(api, schema)
-}
-
 function view(defaultPreset: string, revision = 0, schema: SettingsNamespaceView['schema'] = SCHEMA): SettingsNamespaceView {
   return {
     ns: 'permission',
@@ -42,6 +39,13 @@ function ok<T>(value: T) {
   return { rpcId: 'test', result: { ok: true as const, value } }
 }
 
+/** The permission controller over a real mirror and one fake wire. */
+function permissionController(api: object) {
+  const wire = { settings: api } as never
+  const mirror = new SettingsDescribeMirror(wire)
+  return { mirror, controller: new PermissionPresetSettingsController(mirror, wire, schema) }
+}
+
 describe('permission settings store', () => {
   it('derives dynamic options and host labels from the descriptor schema', () => {
     expect(resolveDefault(view('read-only'))).toEqual({
@@ -104,9 +108,7 @@ describe('permission settings store', () => {
       namespaces: [view('read-only', 4)],
     })))
     const mutate = vi.fn(() => Promise.resolve(ok(view('workspace-write', 5))))
-    const controller = createController({
-      settings: { describe, mutate } as never,
-    })
+    const { controller } = permissionController({ describe, mutate })
     await controller.load()
     expect(controller.store.getSnapshot()).toMatchObject({
       status: 'ready',
@@ -125,126 +127,140 @@ describe('permission settings store', () => {
       currentValue: 'workspace-write',
       revision: 5,
     })
+    // The write answer folded into the mirror; no re-read followed.
+    expect(describe).toHaveBeenCalledTimes(1)
   })
 
   it('hides the row when the namespace is absent and contains write failures', async () => {
     const describe = vi.fn(() => Promise.resolve(ok({ writable: true, hasDocument: false, namespaces: [] })))
-    const controller = createController({
-      settings: { describe, mutate: vi.fn() } as never,
-    })
+    const { controller } = permissionController({ describe, mutate: vi.fn() })
     await controller.load()
     expect(controller.store.getSnapshot().status).toBe('unavailable')
 
-    const failing = createController({
-      settings: {
-        describe: () => Promise.resolve(ok({ writable: true, hasDocument: false, namespaces: [view('read-only')] })),
-        mutate: () => Promise.resolve({
-          rpcId: 'test',
-          result: {
-            ok: false as const,
-            error: { code: 'settings-conflict', message: 'stale', details: {} },
-          },
-        }),
-      } as never,
-    })
+    const failing = permissionController({
+      describe: () => Promise.resolve(ok({ writable: true, hasDocument: false, namespaces: [view('read-only')] })),
+      mutate: () => Promise.resolve({
+        rpcId: 'test',
+        result: {
+          ok: false as const,
+          error: { code: 'settings-conflict', message: 'stale', details: {} },
+        },
+      }),
+    }).controller
     await failing.load()
     await failing.select('workspace-write')
     expect(failing.store.getSnapshot()).toMatchObject({ status: 'error', error: 'stale' })
   })
 
-  it('contains read failures, no-ops without a writable view, and ignores stale responses', async () => {
-    const first = Promise.withResolvers<ReturnType<typeof ok<{
-      writable: boolean
-      namespaces: SettingsNamespaceView[]
-    }>>>()
-    const describe = vi.fn()
-      .mockImplementationOnce(() => first.promise)
-      .mockResolvedValueOnce(ok({ writable: false, hasDocument: false, namespaces: [view('read-only', 2)] }))
+  it('contains read failures and no-ops without a writable view', async () => {
     const mutate = vi.fn()
-    const controller = createController({
-      settings: { describe, mutate } as never,
-    })
-    const stale = controller.load()
-    await controller.load()
-    first.resolve(ok({ writable: true, hasDocument: false, namespaces: [view('workspace-write', 1)] }))
-    await stale
-    expect(controller.store.getSnapshot()).toMatchObject({
+    const readOnly = permissionController({
+      describe: () => Promise.resolve(ok({
+        writable: false, hasDocument: false, namespaces: [view('read-only', 2)],
+      })),
+      mutate,
+    }).controller
+    await readOnly.load()
+    expect(readOnly.store.getSnapshot()).toMatchObject({
       currentValue: 'read-only',
       writable: false,
       revision: 2,
     })
-    await controller.select('workspace-write')
+    await readOnly.select('workspace-write')
     expect(mutate).not.toHaveBeenCalled()
 
-    const rejected = createController({
-      settings: {
-        describe: () => Promise.resolve({
-          rpcId: 'test',
-          result: { ok: false as const, error: { code: 'internal', message: 'offline', details: {} } },
-        }),
-        mutate,
-      } as never,
-    })
+    const rejected = permissionController({
+      describe: () => Promise.resolve({
+        rpcId: 'test',
+        result: { ok: false as const, error: { code: 'internal', message: 'offline', details: {} } },
+      }),
+      mutate,
+    }).controller
     await rejected.select('workspace-write')
     await rejected.load()
     expect(rejected.store.getSnapshot()).toMatchObject({ status: 'error', error: 'offline' })
+    expect(mutate).not.toHaveBeenCalled()
+
+    const thrown = permissionController({
+      describe: async () => { throw 'disconnected' },
+      mutate,
+    }).controller
+    await thrown.load()
+    expect(thrown.store.getSnapshot()).toMatchObject({ status: 'error', error: 'disconnected' })
 
-    const thrown = createController({
+    const wire = {
       settings: {
-        // Promise consumers must contain unknown rejection values from a
-        // transport implementation, including non-Error legacy clients.
-        // oxlint-disable-next-line typescript/prefer-promise-reject-errors
-        describe: () => Promise.reject('disconnected'),
+        describe: () => Promise.resolve(ok({
+          writable: true, hasDocument: false, namespaces: [view('read-only')],
+        })),
         mutate,
-      } as never,
+      },
+    } as never
+    const mirror = new SettingsDescribeMirror(wire)
+    const malformed = new PermissionPresetSettingsController(mirror, wire, {
+      rehydrate: () => { throw 'schema disconnected' },
+    } as never)
+    await malformed.load()
+    expect(malformed.store.getSnapshot()).toMatchObject({
+      status: 'error', error: 'schema disconnected',
     })
-    await thrown.load()
-    expect(thrown.store.getSnapshot()).toMatchObject({ status: 'error', error: 'disconnected' })
   })
 
-  it('disposal suppresses in-flight reads and writes, and loaded invalidations refetch', async () => {
+  it('hides the row in a remote browser instead of loading forever', async () => {
+    const describeCall = vi.fn()
+    const mutate = vi.fn()
+    const wire = { settings: { describe: describeCall, mutate } } as never
+    const mirror = new SettingsDescribeMirror(wire, 'memory')
+    const controller = new PermissionPresetSettingsController(mirror, wire, schema)
+    await controller.load()
+    expect(controller.store.getSnapshot().status).toBe('unavailable')
+    await controller.select('workspace-write')
+    expect(describeCall).not.toHaveBeenCalled()
+    expect(mutate).not.toHaveBeenCalled()
+  })
+
+  it('follows a mirror refresh without an own read once loaded', async () => {
+    const describe = vi.fn()
+      .mockResolvedValueOnce(ok({ writable: true, hasDocument: false, namespaces: [view('read-only', 1)] }))
+      .mockResolvedValueOnce(ok({ writable: true, hasDocument: false, namespaces: [view('workspace-write', 2)] }))
+    const { mirror, controller } = permissionController({ describe, mutate: vi.fn() })
+    await controller.load()
+    expect(controller.store.getSnapshot()).toMatchObject({ currentValue: 'read-only' })
+
+    await mirror.load()
+
+    expect(controller.store.getSnapshot()).toMatchObject({ currentValue: 'workspace-write', revision: 2 })
+  })
+
+  it('disposal stops deriving and suppresses in-flight writes', async () => {
+    const neverRead = vi.fn()
+    const { controller: neverLoaded } = permissionController({ describe: neverRead, mutate: vi.fn() })
+    neverLoaded.dispose()
+    await neverLoaded.load()
+    expect(neverLoaded.store.getSnapshot().status).toBe('idle')
+    expect(neverRead).not.toHaveBeenCalled()
+
     const read = Promise.withResolvers<ReturnType<typeof ok<{
       writable: boolean
       namespaces: SettingsNamespaceView[]
     }>>>()
-    const describe = vi.fn(() => read.promise)
-    const idle = createController({ settings: { describe, mutate: vi.fn() } as never })
-    refreshPermissionIfLoaded(idle)
-    expect(describe).not.toHaveBeenCalled()
+    const { mirror, controller: idle } = permissionController({ describe: () => read.promise, mutate: vi.fn() })
     const loading = idle.load()
     idle.dispose()
     read.resolve(ok({ writable: true, hasDocument: false, namespaces: [view('read-only')] }))
-    await loading
+    await Promise.all([loading, mirror.load()])
     expect(idle.store.getSnapshot().status).toBe('loading')
 
-    const rejectedRead = Promise.withResolvers<ReturnType<typeof ok<{
-      writable: boolean
-      namespaces: SettingsNamespaceView[]
-    }>>>()
-    const disposedRead = createController({
-      settings: { describe: () => rejectedRead.promise, mutate: vi.fn() } as never,
-    })
-    const reading = disposedRead.load()
-    disposedRead.dispose()
-    rejectedRead.reject(new Error('late read'))
-    await reading
-    expect(disposedRead.store.getSnapshot().status).toBe('loading')
-
     const mutation = Promise.withResolvers<ReturnType<typeof ok<SettingsNamespaceView>>>()
-    const activeDescribe = vi.fn(() => Promise.resolve(ok({
-      writable: true,
-      hasDocument: false,
-      namespaces: [view('read-only')],
-    })))
-    const active = createController({
-      settings: {
-        describe: activeDescribe,
-        mutate: () => mutation.promise,
-      } as never,
+    const { controller: active } = permissionController({
+      describe: () => Promise.resolve(ok({
+        writable: true,
+        hasDocument: false,
+        namespaces: [view('read-only')],
+      })),
+      mutate: () => mutation.promise,
     })
     await active.load()
-    refreshPermissionIfLoaded(active)
-    await vi.waitFor(() => { expect(activeDescribe).toHaveBeenCalledTimes(2) })
     const saving = active.select('workspace-write')
     active.dispose()
     mutation.resolve(ok(view('workspace-write', 1)))
@@ -252,11 +268,9 @@ describe('permission settings store', () => {
     expect(active.store.getSnapshot().status).toBe('saving')
 
     const rejectedMutation = Promise.withResolvers<ReturnType<typeof ok<SettingsNamespaceView>>>()
-    const disposedWrite = createController({
-      settings: {
-        describe: () => Promise.resolve(ok({ writable: true, hasDocument: false, namespaces: [view('read-only')] })),
-        mutate: () => rejectedMutation.promise,
-      } as never,
+    const { controller: disposedWrite } = permissionController({
+      describe: () => Promise.resolve(ok({ writable: true, hasDocument: false, namespaces: [view('read-only')] })),
+      mutate: () => rejectedMutation.promise,
     })
     await disposedWrite.load()
     const writing = disposedWrite.select('workspace-write')

packages/client/ui-settings-general/src/client/index.ts

@@ -24,7 +24,7 @@ import { CloseLabel, HeaderContent, TriggerContent } from './chrome.tsx'
 import { GeneralSection } from './GeneralSection.tsx'
 import { SettingsDocumentAction } from './SettingsDocumentAction.tsx'
 import type { SettingsDocumentActionInjected } from './SettingsDocumentAction.tsx'
-import { refreshDocumentIfLoaded, SettingsDocumentStore } from './settings-document-store.ts'
+import { SettingsDocumentStore } from './settings-document-store.ts'
 import { en, zh, type SettingsKey } from './locales.ts'
 
 export type {
@@ -53,7 +53,7 @@ const NS = 'settings'
  * ui-settings' apply, whose activation order relative to this one is NOT
  * constrained; registrations depend on their slots through `slots.inject()`.
  */
-export const inject = ['slots', 'locale', 'connection']
+export const inject = ['slots', 'locale', 'connection', 'settingsScope']
 
 /**
  * Register the `settings` dictionaries, the chrome content, and the General
@@ -68,8 +68,10 @@ export function apply(ctx: ClientContext): void {
   // locale/change re-registration wiring.
   const t = ctx.locale.bind(NS)
   const connection = ctx.get('connection') as ConnectionHandle
+  // The action follows the shared describe mirror, whose owning plugin
+  // already refreshes it on document commits and reconnects.
   const documentController = connection.isLoopback
-    ? new SettingsDocumentStore(connection.api)
+    ? new SettingsDocumentStore(connection.api, ctx.settingsScope.describe())
     : undefined
   const documentInjected = documentController === undefined
     ? undefined
@@ -77,9 +79,7 @@ export function apply(ctx: ClientContext): void {
       controller: documentController,
       hooks: { snapshot: documentController.store },
     })
-  ctx.effect(() => ctx.on('connection/reset', () => {
-    refreshDocumentIfLoaded(documentController)
-  }), 'ui-settings-general: metadata invalidations')
+  ctx.effect(() => () => { documentController?.dispose() }, 'ui-settings-general: document action directory')
   // The settings shell: this package occupies the sidebar-owned hole and
   // declares the settings slots. Ledger → nav-row projection as an observable
   // source (uSES contract: getSnapshot returns the cached rows until the

packages/client/ui-settings-general/src/client/settings-document-store.ts

@@ -2,6 +2,7 @@
 
 import type { IApiClient } from '@deepseek-ai/dsh-api-remotes/client'
 import { createSnapshotStore, type SnapshotStore } from '@deepseek-ai/dsh-client-runtime/client'
+import type { SettingsDescribeFace } from '@deepseek-ai/dsh-client-ui-settings/client'
 
 /** Browser state of the Host-owned settings document. */
 export interface SettingsDocumentState {
@@ -17,51 +18,37 @@ function messageOf(error: unknown): string {
   return error instanceof Error ? error.message : String(error)
 }
 
-/** Loads local-document availability and invokes the pathless Host-owned open operation. */
+/** Derives local-document availability from the shared mirror and invokes the pathless Host-owned open operation. */
 export class SettingsDocumentStore {
   /** uSES-safe state source shared by the registered header action. */
   readonly store: SnapshotStore<SettingsDocumentState> = createSnapshotStore({
     status: 'idle', opening: false, error: null,
   })
 
-  private generation = 0
+  private following: (() => void) | undefined
 
   /**
-   * @param api - loopback settings wire face that reports and opens the provider document.
+   * @param api - loopback settings wire face that opens the provider document.
+   * @param describeFace - the shared mirror's describe face (`hasDocument` source).
    */
-  constructor(private readonly api: Pick<IApiClient, 'settings'>) {}
+  constructor(
+    private readonly api: Pick<IApiClient, 'settings'>,
+    private readonly describeFace: SettingsDescribeFace,
+  ) {}
 
   /**
-   * Load whether the current provider owns a local document.
-   * @returns after the latest metadata response updates the store.
+   * Begin following the mirror (idempotent) and reflect whether the current
+   * provider owns a local document.
+   * @returns settlement once the snapshot reflects the mirror.
    */
   async load(): Promise<void> {
-    const generation = ++this.generation
+    this.following ??= this.describeFace.subscribe(() => { this.derive() })
     this.store.update((state) => {
       state.status = 'loading'
       state.error = null
     })
-    try {
-      const { result } = await this.api.settings.describe({})
-      if (generation !== this.generation) return
-      if (!result.ok) {
-        this.store.update((state) => {
-          state.status = 'unavailable'
-          state.error = result.error.message
-        })
-        return
-      }
-      this.store.update((state) => {
-        state.status = result.value.hasDocument ? 'ready' : 'unavailable'
-        state.error = null
-      })
-    } catch (error) {
-      if (generation !== this.generation) return
-      this.store.update((state) => {
-        state.status = 'unavailable'
-        state.error = messageOf(error)
-      })
-    }
+    await this.describeFace.ensure()
+    this.derive()
   }
 
   /**
@@ -84,13 +71,30 @@ export class SettingsDocumentStore {
       this.store.update((state) => { state.opening = false })
     }
   }
-}
 
-/**
- * Refresh document availability after reconnect only when a surface has already requested it.
- * @param controller - optional loopback document state owner.
- */
-export function refreshDocumentIfLoaded(controller: SettingsDocumentStore | undefined): void {
-  if (controller === undefined || controller.store.getSnapshot().status === 'idle') return
-  void controller.load()
+  /** Stop following the mirror. */
+  dispose(): void {
+    this.following?.()
+    this.following = undefined
+  }
+
+  private derive(): void {
+    const mirrored = this.describeFace.getSnapshot()
+    if (mirrored.view === undefined) {
+      // A held failure with no answer means the document cannot be located;
+      // without one the read is still in flight and loading stands.
+      if (mirrored.error !== null) {
+        this.store.update((state) => {
+          state.status = 'unavailable'
+          state.error = mirrored.error
+        })
+      }
+      return
+    }
+    const { hasDocument } = mirrored.view
+    this.store.update((state) => {
+      state.status = hasDocument ? 'ready' : 'unavailable'
+      state.error = null
+    })
+  }
 }

packages/client/ui-settings-general/tests/apply.client.spec.ts

@@ -4,7 +4,8 @@ import { describe, expect, it, vi } from 'vitest'
 import { resolveSlotLabel } from '@deepseek-ai/dsh-client-ui-slots'
 import { SlotRegistry } from '@deepseek-ai/dsh-client-runtime/client'
 import { LocaleRuntime } from '@deepseek-ai/dsh-client-locale/client'
-import { usePinnedBrowserLanguages } from '@deepseek-ai/dsh-client-test-runtime'
+import { TestRemote, usePinnedBrowserLanguages } from '@deepseek-ai/dsh-client-test-runtime'
+import { apply as settingsApply, inject as settingsInject } from '@deepseek-ai/dsh-client-ui-settings/client'
 import { apply, inject } from '@deepseek-ai/dsh-client-ui-settings-general/client'
 import { CloseLabel, HeaderContent, TriggerContent } from '../src/client/chrome.tsx'
 import { GeneralSection } from '../src/client/GeneralSection.tsx'
@@ -48,6 +49,8 @@ async function bench(isLoopback = true) {
     api: { settings: { describe: settingsDescribe, openDocument: settingsOpenDocument } },
     isLoopback,
   } as never)
+  new TestRemote(ctx)
+  await ctx.plugin({ inject: [...settingsInject], apply: settingsApply }).await()
   return { ctx, slots: ctx.get('slots') as SlotRegistry, locale, settingsDescribe, settingsOpenDocument }
 }
 
@@ -75,7 +78,7 @@ function generalEntry(slots: SlotRegistry) {
 
 describe('ui-settings-general apply', () => {
   it('declares the services it uses', () => {
-    expect(inject).toEqual(['slots', 'locale', 'connection'])
+    expect(inject).toEqual(['slots', 'locale', 'connection', 'settingsScope'])
   })
 
   it('fills all five seats for declarations before or after apply', async () => {
@@ -149,16 +152,17 @@ describe('ui-settings-general apply', () => {
     expect(resolveSlotLabel(generalEntry(b.slots)!.options.label)).toBe('通用设置')
   })
 
-  it('refreshes loaded document availability on reconnect without reading it eagerly', async () => {
+  it('reads availability from the shared mirror and follows its reconnect refresh', async () => {
     const b = await bench()
     declare(b.slots)
     await b.ctx.plugin({ inject: [...inject], apply }).await()
     const entry = b.slots.entries('settings.action')[0]!
     const { controller } = (entry.inject as unknown as () => SettingsDocumentActionInjected)()
-    b.ctx.emit('connection/reset')
-    expect(b.settingsDescribe).not.toHaveBeenCalled()
+    // The mirror read once at its own boot; the action's load adds no read.
+    await vi.waitFor(() => { expect(b.settingsDescribe).toHaveBeenCalledOnce() })
     await controller.load()
     expect(b.settingsDescribe).toHaveBeenCalledOnce()
+    expect(controller.store.getSnapshot().status).toBe('ready')
     b.ctx.emit('connection/reset')
     await vi.waitFor(() => { expect(b.settingsDescribe).toHaveBeenCalledTimes(2) })
   })

packages/client/ui-settings-general/tests/components.client.spec.tsx

@@ -7,7 +7,14 @@ import { GeneralSection } from '../src/client/GeneralSection.tsx'
 import { CloseLabel, HeaderContent, TriggerContent } from '../src/client/chrome.tsx'
 import type { TriggerContentProps } from '../src/client/chrome.tsx'
 import { SettingsDocumentAction } from '../src/client/SettingsDocumentAction.tsx'
+import { SettingsDescribeMirror } from '@deepseek-ai/dsh-client-ui-settings/src/client/settings-mirror.ts'
 import { SettingsDocumentStore } from '../src/client/settings-document-store.ts'
+
+/** Store over a real mirror derived from the same fake wire. */
+function derivedDocumentStore(api: object) {
+  const wire = api as never
+  return new SettingsDocumentStore(wire, new SettingsDescribeMirror(wire))
+}
 import { en } from '../src/client/locales.ts'
 
 afterEach(cleanup)
@@ -64,7 +71,7 @@ describe('SettingsDocumentAction', () => {
       rpcId: 'document-open' as never,
       result: { ok: true as const, value: { opened: true as const } },
     }))
-    const controller = new SettingsDocumentStore({
+    const controller = derivedDocumentStore({
       settings: {
         describe: vi.fn(() => Promise.resolve({
           rpcId: 'document-action' as never,
@@ -75,7 +82,7 @@ describe('SettingsDocumentAction', () => {
         })),
         openDocument,
       },
-    } as never)
+    })
     render(<SettingsDocumentAction
       {...kit}
       t={t}
@@ -87,7 +94,7 @@ describe('SettingsDocumentAction', () => {
     await waitFor(() => { expect(openDocument).toHaveBeenCalledWith({}) })
   })
 
-  it('stays absent without a document and retries availability after remount', async () => {
+  it('stays absent without a document and follows a mirror refresh to available', async () => {
     const describe = vi.fn()
       .mockResolvedValueOnce({
         rpcId: 'document-action-absent' as never,
@@ -97,12 +104,9 @@ describe('SettingsDocumentAction', () => {
         rpcId: 'document-action-ready' as never,
         result: { ok: true as const, value: { writable: true, hasDocument: true, namespaces: [] } },
       })
-    const controller = new SettingsDocumentStore({
-      settings: {
-        describe,
-        openDocument: vi.fn(),
-      },
-    } as never)
+    const wire = { settings: { describe, openDocument: vi.fn() } } as never
+    const mirror = new SettingsDescribeMirror(wire)
+    const controller = new SettingsDocumentStore(wire, mirror)
     const first = render(<SettingsDocumentAction
       {...kit}
       t={t}
@@ -118,12 +122,17 @@ describe('SettingsDocumentAction', () => {
       controller={controller}
       useSnapshot={bindSnapshotSelector(controller.store)}
     />)
+    // A remount alone re-reads nothing; availability moves with the mirror's
+    // own refresh (a document commit or reconnect in production).
+    await waitFor(() => { expect(controller.store.getSnapshot().status).toBe('unavailable') })
+    expect(describe).toHaveBeenCalledTimes(1)
+    await mirror.load()
     expect(await screen.findByRole('button', { name: 'Open configuration file' })).toBeTruthy()
     expect(describe).toHaveBeenCalledTimes(2)
   })
 
   it('keeps the action available and reports a native-open failure', async () => {
-    const controller = new SettingsDocumentStore({
+    const controller = derivedDocumentStore({
       settings: {
         describe: vi.fn(() => Promise.resolve({
           rpcId: 'document-action' as never,
@@ -137,7 +146,7 @@ describe('SettingsDocumentAction', () => {
           result: { ok: false as const, error: { code: 'internal' as const, message: 'xdg-open missing', details: {} } },
         })),
       },
-    } as never)
+    })
     render(<SettingsDocumentAction
       {...kit}
       t={t}

packages/client/ui-settings-general/tests/settings-document-store.client.spec.ts

@@ -1,7 +1,14 @@
 import { describe, expect, it, vi } from 'vitest'
 import type { RpcResponse } from '@deepseek-ai/dsh-api-remotes/client'
+import { SettingsDescribeMirror } from '@deepseek-ai/dsh-client-ui-settings/src/client/settings-mirror.ts'
 import { SettingsDocumentStore } from '../src/client/settings-document-store.ts'
 
+/** Store over a real mirror derived from the same fake wire. */
+function derivedDocumentStore(api: object) {
+  const wire = api as never
+  return new SettingsDocumentStore(wire, new SettingsDescribeMirror(wire))
+}
+
 function response(hasDocument = false): RpcResponse<{
   writable: boolean
   hasDocument: boolean
@@ -34,7 +41,7 @@ describe('SettingsDocumentStore', () => {
   it('loads provider metadata and asks the settings domain to open its document', async () => {
     const describe = vi.fn(() => Promise.resolve(response(true)))
     const openDocument = vi.fn(() => Promise.resolve(opened()))
-    const controller = new SettingsDocumentStore({ settings: { describe, openDocument } } as never)
+    const controller = derivedDocumentStore({ settings: { describe, openDocument } })
     await controller.load()
     expect(controller.store.getSnapshot()).toEqual({
       status: 'ready', opening: false, error: null,
@@ -45,23 +52,23 @@ describe('SettingsDocumentStore', () => {
 
   it('marks absent or failed metadata unavailable without opening anything', async () => {
     const openDocument = vi.fn(() => Promise.resolve(opened()))
-    const absent = new SettingsDocumentStore({
+    const absent = derivedDocumentStore({
       settings: { describe: () => Promise.resolve(response()), openDocument },
-    } as never)
+    })
     await absent.load()
     await absent.open()
     expect(absent.store.getSnapshot().status).toBe('unavailable')
     expect(openDocument).not.toHaveBeenCalled()
 
-    const failed = new SettingsDocumentStore({
+    const failed = derivedDocumentStore({
       settings: { describe: () => Promise.reject(new Error('offline')), openDocument },
-    } as never)
+    })
     await failed.load()
     expect(failed.store.getSnapshot()).toMatchObject({ status: 'unavailable', error: 'offline' })
 
-    const rejected = new SettingsDocumentStore({
+    const rejected = derivedDocumentStore({
       settings: { describe: () => Promise.resolve(describeFailed('provider failed')), openDocument },
-    } as never)
+    })
     await rejected.load()
     expect(rejected.store.getSnapshot()).toMatchObject({
       status: 'unavailable', error: 'provider failed',
@@ -71,9 +78,9 @@ describe('SettingsDocumentStore', () => {
   it('collapses concurrent open gestures and recovers after a failure', async () => {
     let resolveOpen!: (response: RpcResponse<{ opened: true }>) => void
     const openDocument = vi.fn(() => new Promise<RpcResponse<{ opened: true }>>((resolve) => { resolveOpen = resolve }))
-    const controller = new SettingsDocumentStore({
+    const controller = derivedDocumentStore({
       settings: { describe: () => Promise.resolve(response(true)), openDocument },
-    } as never)
+    })
     await controller.load()
     const first = controller.open()
     const second = controller.open()
@@ -88,23 +95,15 @@ describe('SettingsDocumentStore', () => {
     })
   })
 
-  it('ignores stale metadata completions and reports non-Error native failures', async () => {
-    let resolveFirst!: (value: ReturnType<typeof response>) => void
-    const first = new Promise<ReturnType<typeof response>>((resolve) => { resolveFirst = resolve })
-    const describe = vi.fn()
-      .mockReturnValueOnce(first)
-      .mockResolvedValueOnce(response(true))
+  it('reports non-Error native failures and recovers availability via a mirror refresh', async () => {
     let rejectOpen!: (reason?: unknown) => void
-    const controller = new SettingsDocumentStore({
+    const controller = derivedDocumentStore({
       settings: {
-        describe,
+        describe: vi.fn(() => Promise.resolve(response(true))),
         openDocument: () => new Promise((_, reject) => { rejectOpen = reject }),
       },
-    } as never)
-    const stale = controller.load()
+    })
     await controller.load()
-    resolveFirst(response())
-    await stale
     expect(controller.store.getSnapshot().status).toBe('ready')
     const opening = controller.open()
     rejectOpen('native unavailable')
@@ -113,20 +112,21 @@ describe('SettingsDocumentStore', () => {
       status: 'ready', opening: false, error: 'native unavailable',
     })
 
-    let rejectFirst!: (error: Error) => void
-    const rejectedFirst = new Promise<ReturnType<typeof response>>((_, reject) => { rejectFirst = reject })
-    const caught = new SettingsDocumentStore({
+    // A first read that failed leaves the action unavailable with the miss
+    // recorded; the mirror's next refresh (a commit or reconnect) recovers it.
+    const wire = {
       settings: {
         describe: vi.fn()
-          .mockReturnValueOnce(rejectedFirst)
+          .mockRejectedValueOnce(new Error('offline'))
           .mockResolvedValueOnce(response(true)),
         openDocument: vi.fn(),
       },
-    } as never)
-    const staleRejection = caught.load()
+    } as never
+    const mirror = new SettingsDescribeMirror(wire)
+    const caught = new SettingsDocumentStore(wire, mirror)
     await caught.load()
-    rejectFirst(new Error('stale offline'))
-    await staleRejection
+    expect(caught.store.getSnapshot()).toMatchObject({ status: 'unavailable', error: 'offline' })
+    await mirror.load()
     expect(caught.store.getSnapshot()).toMatchObject({ status: 'ready', error: null })
   })
 })

packages/client/ui-settings-general/tests/shell.client.spec.ts

@@ -2,6 +2,7 @@
 import { Context } from '@deepseek-ai/cordis'
 import { describe, expect, it, vi } from 'vitest'
 import { SlotRegistry } from '@deepseek-ai/dsh-client-runtime/client'
+import { apply as settingsApply, inject as settingsInject } from '@deepseek-ai/dsh-client-ui-settings/client'
 import { apply, inject } from '../src/client/index.ts'
 import type { SettingsRootInjected } from '../src/client/shell-contract.ts'
 import { SettingsRoot } from '../src/client/SettingsRoot.tsx'
@@ -22,6 +23,7 @@ async function bench() {
     isLoopback: false,
   } as never)
   ctx.provide('remote', { $on: () => () => {} } as never)
+  await ctx.plugin({ inject: [...settingsInject], apply: settingsApply }).await()
   return { ctx, slots: ctx.get('slots') as SlotRegistry }
 }
 
@@ -49,7 +51,7 @@ const CHILD_SPECS = {
 
 describe('ui-settings apply', () => {
   it('declares only the slot registry (a pure composition face, no locale)', () => {
-    expect(inject).toEqual(['slots', 'locale', 'connection'])
+    expect(inject).toEqual(['slots', 'locale', 'connection', 'settingsScope'])
   })
 
   it('registers the shell and declares every child slot, before or after the declaration', async () => {

packages/client/ui-settings-models/src/client/index.ts

@@ -21,7 +21,7 @@ import { DeepSeekOnboardingDialog } from './DeepSeekOnboardingDialog.tsx'
 import type { DeepSeekOnboardingInjected } from './DeepSeekOnboardingDialog.tsx'
 import { WelcomeNotice } from './WelcomeNotice.tsx'
 import type { WelcomeNoticeInjected } from './WelcomeNotice.tsx'
-import { refreshWelcomeIfLoaded, WelcomeNoticeStore } from './welcome-store.ts'
+import { decodeWelcomeSection, WelcomeNoticeStore } from './welcome-store.ts'
 import { ModelsSettingsStore } from './store.ts'
 import { createSettingsSchemaOperations } from './schema-operations.ts'
 import { en, zh, type ModelsKey } from './locales.ts'
@@ -56,7 +56,7 @@ export function refreshIfLoaded(controller: ModelsSettingsStore): void {
  * ui-settings' apply, whose activation order relative to this one is NOT
  * constrained; registration depends on each slot through `slots.inject()`.
  */
-export const inject = ['slots', 'locale', 'connection', 'remote', 'settingsSchema']
+export const inject = ['slots', 'locale', 'connection', 'remote', 'settingsScope', 'settingsSchema']
 
 /**
  * Register the Models section once the `settings.section` declaration is on
@@ -69,7 +69,7 @@ export function apply(ctx: ClientContext): void {
 
   const connection = ctx.get('connection') as ConnectionHandle
   const schema = createSettingsSchemaOperations(ctx.settingsSchema)
-  const controller = new ModelsSettingsStore(connection.api, schema)
+  const controller = new ModelsSettingsStore(connection.api, schema, ctx.settingsScope.describe())
   // Registration-time text (the nav label thunk) and the inject faces share
   // one bound translate; copy freshness rides the locale revision.
   const t = ctx.locale.bind(NS) as ModelsSectionInjected['t']
@@ -87,34 +87,35 @@ export function apply(ctx: ClientContext): void {
     schema,
     t,
   })
-  const welcomeController = new WelcomeNoticeStore(
-    connection.api,
-    connection.isLoopback ? 'host' : 'memory',
-  )
+  // The scope's own memory mode is what keeps a remote browser process-local,
+  // so the store needs no isLoopback branch of its own.
+  const welcomeController = new WelcomeNoticeStore(ctx.settingsScope.bind({
+    namespace: WELCOME_NOTICE_SETTINGS_NAMESPACE,
+    decode: decodeWelcomeSection,
+  }))
   const welcomeInjected = (): WelcomeNoticeInjected => ({
     controller: welcomeController,
     hooks: { welcome: welcomeController.store },
     t,
   })
 
-  // Pushed invalidations converge every open surface without polling: any
-  // settings/credentials/topology change refetches once the page loaded.
+  // Pushed invalidations converge every open surface without polling. The
+  // settingsScope injection makes ui-settings activate first, and remote
+  // dispatch preserves listener order; its listener therefore starts the
+  // mirror refresh before this store joins that refresh. The welcome notice
+  // follows its settings scope, so it needs no subscription here.
   ctx.effect(() => {
     const refreshModels = (): void => { refreshIfLoaded(controller) }
-    const refreshAll = (): void => {
-      refreshModels()
-      refreshWelcomeIfLoaded(welcomeController)
-    }
     const disposers = [
-      ctx.remote.$on('settings/document-updated', (ns) => {
-        refreshModels()
-        if (ns === WELCOME_NOTICE_SETTINGS_NAMESPACE) refreshWelcomeIfLoaded(welcomeController)
-      }),
+      ctx.remote.$on('settings/document-updated', () => { refreshModels() }),
       ctx.remote.$on('credentials/updated', refreshModels),
       ctx.remote.$on('llm/adapters-updated', refreshModels),
-      ctx.on('connection/reset', refreshAll),
+      ctx.on('connection/reset', refreshModels),
     ]
-    return () => { for (const dispose of disposers) dispose() }
+    return () => {
+      welcomeController.dispose()
+      for (const dispose of disposers) dispose()
+    }
   }, 'ui-settings-models: pushed invalidations')
 
   ctx.slots.inject('settings.section', () => ctx.slots.register({

packages/client/ui-settings-models/src/client/store.ts

@@ -1,6 +1,6 @@
 /**
  * Models settings page store: one snapshot joining the configurable-provider
- * directory (`llm.providers`), the settings namespaces (`settings.describe`),
+ * directory (`llm.providers`), the settings namespaces (shared settings mirror),
  * and the referenced credentials (`credentials.describe`). The host stays the
  * single fact source — every mutation writes through the wire and the page
  * re-renders from the next describe, pushed or refetched.
@@ -11,6 +11,7 @@ import type {
 } from '@deepseek-ai/dsh-api-remotes/client'
 import type { SnapshotStore } from '@deepseek-ai/dsh-client-runtime/client'
 import { createSnapshotStore } from '@deepseek-ai/dsh-client-runtime/client'
+import type { SettingsDescribeFace } from '@deepseek-ai/dsh-client-ui-settings/client'
 import type { SettingsSchemaOperations } from './schema-operations.ts'
 
 /**
@@ -114,17 +115,21 @@ export class ModelsSettingsStore {
   private generation = 0
 
   /**
-   * @param api - the wire face (settings/credentials/llm domains).
+   * @param api - the wire face (credentials/llm domains, and settings writes).
+   * @param describeFace - the shared mirror's describe face (namespace views and writability).
    */
   constructor(
     private readonly api: Pick<IApiClient, 'settings' | 'credentials' | 'llm'>,
     private readonly schema: SettingsSchemaOperations,
+    private readonly describeFace: SettingsDescribeFace,
   ) {}
 
   /**
-   * Refresh the whole page snapshot: directory and namespaces in parallel,
-   * then one batched credential describe over every referenced ref. A
-   * failure keeps the last good rows and surfaces the error.
+   * Refresh the whole page snapshot: the provider directory and the mirror's
+   * settings answer in parallel, then one batched credential describe over
+   * every referenced ref. Provider failure or absence of an initial settings
+   * answer keeps the last good rows and surfaces an error; a failed settings
+   * refresh reuses the mirror's held view.
    * @returns nothing; the snapshot carries the outcome.
    */
   async load(): Promise<void> {
@@ -132,17 +137,20 @@ export class ModelsSettingsStore {
     this.store.update((s) => { s.status = 'loading'; s.error = null })
     let providers: ConfigurableProviderView[]
     let writable: boolean
-    let views: SettingsNamespaceView[]
+    let views: readonly SettingsNamespaceView[]
     try {
-      const [providersResponse, settingsResponse] = await Promise.all([
+      const [providersResponse] = await Promise.all([
         this.api.llm.providers({}),
-        this.api.settings.describe({}),
+        this.describeFace.ensure(),
       ])
       if (!providersResponse.result.ok) throw new Error(providersResponse.result.error.message)
-      if (!settingsResponse.result.ok) throw new Error(settingsResponse.result.error.message)
+      const mirrored = this.describeFace.getSnapshot()
+      if (mirrored.view === undefined) {
+        throw new Error(mirrored.error ?? 'settings are unavailable in this browser')
+      }
       providers = providersResponse.result.value.providers
-      writable = settingsResponse.result.value.writable
-      views = settingsResponse.result.value.namespaces
+      writable = mirrored.view.writable
+      views = mirrored.view.namespaces
     } catch (error) {
       if (generation !== this.generation) return
       this.store.update((s) => {

packages/client/ui-settings-models/src/client/welcome-store.ts

@@ -1,10 +1,14 @@
-/** Welcome-notice state, durable when the browser may use Host settings. */
+/**
+ * Welcome-notice state derived from the welcome settings scope. The scope is
+ * the transport: a loopback browser follows the durable Host section, while a
+ * remote browser's memory-mode scope never answers and the acknowledgement
+ * stays process-local here.
+ */
 
-import type { IApiClient, SettingsNamespaceView } from '@deepseek-ai/dsh-api-remotes/client'
-import type { SnapshotStore } from '@deepseek-ai/dsh-client-runtime/client'
+import type { SettingsScope, SnapshotStore } from '@deepseek-ai/dsh-client-runtime/client'
 import { createSnapshotStore } from '@deepseek-ai/dsh-client-runtime/client'
 import {
-  WELCOME_NOTICE_ACK_FIELD, WELCOME_NOTICE_SETTINGS_NAMESPACE, WELCOME_NOTICE_VERSION,
+  WELCOME_NOTICE_ACK_FIELD, WELCOME_NOTICE_VERSION,
 } from '../onboarding-copy.ts'
 
 /** State rendered by the welcome step. */
@@ -14,113 +18,123 @@ export interface WelcomeNoticeState {
   error: string | null
 }
 
-function messageOf(error: unknown): string {
-  return error instanceof Error ? error.message : String(error)
+/** The welcome section as the notice reads it. */
+export type WelcomeSection = Record<string, unknown>
+
+/**
+ * Accept any object section verbatim; a malformed durable value reads as an
+ * empty section, so the notice treats it as unacknowledged instead of leaving
+ * the scope stuck on its previous value.
+ * @param section - the wire section value.
+ * @returns the section object, or an empty one for non-object values.
+ */
+export function decodeWelcomeSection(section: unknown): WelcomeSection {
+  return typeof section === 'object' && section !== null && !Array.isArray(section)
+    ? section as WelcomeSection
+    : {}
 }
 
-function acknowledgementOf(view: SettingsNamespaceView): string | undefined {
-  if (typeof view.value !== 'object' || view.value === null) return undefined
-  const value = (view.value as Record<string, unknown>)[WELCOME_NOTICE_ACK_FIELD]
-  return typeof value === 'string' ? value : undefined
+/* v8 ignore next 3 -- closed-union default only defends future source widening */
+function assertNever(_value: never): never {
+  throw new Error('unexpected welcome settings status')
 }
 
 /** Coordinates durable Host acknowledgement or a process-local remote fallback. */
 export class WelcomeNoticeStore {
   /** uSES-safe state source shared by the registered welcome step. */
-  readonly store: SnapshotStore<WelcomeNoticeState> = createSnapshotStore({
+  readonly store: SnapshotStore<WelcomeNoticeState> = createSnapshotStore<WelcomeNoticeState>({
     status: 'idle', acknowledged: false, error: null,
   })
 
-  private generation = 0
+  private localAcknowledged = false
+  private saving = false
+  private following: (() => void) | undefined
 
   /**
-   * @param api - settings wire face used for durable reads and writes.
-   * @param persistence - remote browsers use memory because settings is loopback-only.
+   * @param scope - the welcome settings namespace scope; its memory mode is
+   * what keeps a remote browser process-local.
    */
-  constructor(
-    private readonly api: Pick<IApiClient, 'settings'>,
-    private readonly persistence: 'host' | 'memory' = 'host',
-  ) {}
+  constructor(private readonly scope: SettingsScope<WelcomeSection>) {}
 
-  /** Load the acknowledgement from Host settings or initialize process-local state. */
-  async load(): Promise<void> {
-    const generation = ++this.generation
-    if (this.persistence === 'memory') {
-      this.store.update((state) => { state.status = 'ready'; state.error = null })
-      return
+  /**
+   * Begin following the bound scope (idempotent) and publish its current answer.
+   * @returns settlement after the current answer is published.
+   */
+  load(): Promise<void> {
+    this.following ??= this.scope.subscribe(() => { this.derive() })
+    this.derive()
+    return Promise.resolve()
+  }
+
+  /**
+   * Persist this copy version, or advance only this process for a remote
+   * browser. Success is judged against the state the write left behind, so a
+   * refused or failed write reports false after its recovery read settles.
+   * @returns true when the selected persistence mode holds the acknowledgement.
+   */
+  async acknowledge(): Promise<boolean> {
+    if (this.scope.getSnapshot().mode === 'memory') {
+      this.localAcknowledged = true
+      this.derive()
+      return true
     }
-    this.store.update((state) => { state.status = 'loading'; state.error = null })
+    this.saving = true
+    this.store.update((state) => { state.status = 'saving'; state.error = null })
     try {
-      const response = await this.api.settings.describe({})
-      if (!response.result.ok) throw new Error(response.result.error.message)
-      const view = response.result.value.namespaces.find(
-        candidate => candidate.ns === WELCOME_NOTICE_SETTINGS_NAMESPACE,
-      )
-      if (view === undefined) throw new Error('welcome acknowledgement settings are unavailable')
-      if (generation !== this.generation) return
-      this.store.update((state) => {
-        state.status = 'ready'
-        state.acknowledged = acknowledgementOf(view) === WELCOME_NOTICE_VERSION
-        state.error = null
-      })
-    } catch (error) {
-      if (generation !== this.generation) return
+      await this.scope.set(WELCOME_NOTICE_ACK_FIELD, WELCOME_NOTICE_VERSION)
+    } finally {
+      this.saving = false
+    }
+    this.derive()
+    const { acknowledged } = this.store.getSnapshot()
+    if (!acknowledged) {
       this.store.update((state) => {
         state.status = 'error'
-        state.acknowledged = false
-        state.error = messageOf(error)
+        state.error = 'the acknowledgement did not persist'
       })
     }
+    return acknowledged
   }
 
-  /**
-   * Persist this copy version, or advance only this process for a remote browser.
-   * @returns true when the selected persistence mode accepted the acknowledgement.
-   */
-  async acknowledge(): Promise<boolean> {
-    const generation = ++this.generation
-    if (this.persistence === 'memory') {
+  /** Stop following the scope. */
+  dispose(): void {
+    this.following?.()
+    this.following = undefined
+  }
+
+  private derive(): void {
+    if (this.saving) return
+    const scope = this.scope.getSnapshot()
+    if (scope.mode === 'memory') {
       this.store.update((state) => {
         state.status = 'ready'
-        state.acknowledged = true
+        state.acknowledged = this.localAcknowledged
         state.error = null
       })
-      return true
+      return
     }
-    this.store.update((state) => { state.status = 'saving'; state.error = null })
-    try {
-      const response = await this.api.settings.mutate({
-        ns: WELCOME_NOTICE_SETTINGS_NAMESPACE,
-        ops: [{ op: 'set', path: [WELCOME_NOTICE_ACK_FIELD], value: WELCOME_NOTICE_VERSION }],
-      })
-      if (!response.result.ok) throw new Error(response.result.error.message)
-      if (generation === this.generation) {
-        this.store.update((state) => {
-          state.status = 'ready'
-          state.acknowledged = true
-          state.error = null
-        })
-      }
-      return true
-    } catch (error) {
-      if (generation === this.generation) {
+    switch (scope.status) {
+      case 'loading':
+        this.store.update((state) => { state.status = 'loading'; state.error = null })
+        return
+      case 'unavailable':
         this.store.update((state) => {
           state.status = 'error'
           state.acknowledged = false
-          state.error = messageOf(error)
+          state.error = 'welcome acknowledgement settings are unavailable'
         })
+        return
+      case 'ready': {
+        const acknowledged = scope.value?.[WELCOME_NOTICE_ACK_FIELD] === WELCOME_NOTICE_VERSION
+        this.store.update((state) => {
+          state.status = 'ready'
+          state.acknowledged = acknowledged
+          state.error = null
+        })
+        return
       }
-      return false
+      /* v8 ignore next -- every current settings scope status is handled above */
+      default: return assertNever(scope.status)
     }
   }
 }
-
-/**
- * Refresh only after welcome state has left idle. A memory-mode load retains
- * acknowledgement so reconnect does not reopen a process-local notice.
- * @param controller - welcome state owner whose current status decides whether to load.
- */
-export function refreshWelcomeIfLoaded(controller: WelcomeNoticeStore): void {
-  if (controller.store.getSnapshot().status === 'idle') return
-  void controller.load()
-}

packages/client/ui-settings-models/tests/apply.client.spec.ts

@@ -5,8 +5,11 @@ import { resolveSlotLabel } from '@deepseek-ai/dsh-client-ui-slots'
 import { SlotRegistry } from '@deepseek-ai/dsh-client-runtime/client'
 import { LocaleRuntime } from '@deepseek-ai/dsh-client-locale/client'
 import { TestRemote, usePinnedBrowserLanguages } from '@deepseek-ai/dsh-client-test-runtime'
-import { SettingsSchemaService } from '@deepseek-ai/dsh-client-ui-settings/src/client/schema.ts'
+import { apply as settingsApply, inject as settingsInject } from '@deepseek-ai/dsh-client-ui-settings/client'
 import { apply, inject, refreshIfLoaded } from '@deepseek-ai/dsh-client-ui-settings-models/client'
+import {
+  WELCOME_NOTICE_ACK_FIELD, WELCOME_NOTICE_SETTINGS_NAMESPACE, WELCOME_NOTICE_VERSION,
+} from '../src/onboarding-copy.ts'
 import { ModelsSection } from '../src/client/ModelsSection.tsx'
 import { DeepSeekOnboardingDialog } from '../src/client/DeepSeekOnboardingDialog.tsx'
 import { WelcomeNotice } from '../src/client/WelcomeNotice.tsx'
@@ -15,7 +18,7 @@ import { WelcomeNotice } from '../src/client/WelcomeNotice.tsx'
 // the shipped Chinese copy, so they state the browser they assume.
 usePinnedBrowserLanguages('zh-CN')
 
-async function bench(isLoopback = true) {
+async function bench(isLoopback = true, settings?: object, services: object = {}) {
   const ctx = new Context()
   await ctx.plugin(SlotRegistry).await()
   const locale = new LocaleRuntime(ctx)
@@ -23,10 +26,14 @@ async function bench(isLoopback = true) {
   // The plugins inject `remote`; forwarded events reach them through the
   // same `$dispatch` handoff the connection sink makes.
   new TestRemote(ctx)
-  // The apply path only captures the wire face; no call leaves this fake
-  // until a section actually loads.
-  ctx.provide('connection', { api: {}, isLoopback } as never)
-  new SettingsSchemaService(ctx)
+  // Without a settings face the mirror's reads fail and stay contained; the
+  // Models join itself never fetches until a section actually loads. The real
+  // ui-settings apply also provides the settingsSchema service.
+  ctx.provide('connection', {
+    api: settings === undefined ? services : { ...services, settings },
+    isLoopback,
+  } as never)
+  await ctx.plugin({ inject: [...settingsInject], apply: settingsApply }).await()
   return { ctx, slots: ctx.get('slots') as SlotRegistry, locale }
 }
 
@@ -45,7 +52,7 @@ function declare(slots: SlotRegistry): () => void {
 
 describe('ui-settings-models apply', () => {
   it('declares the services it uses', () => {
-    expect(inject).toEqual(['slots', 'locale', 'connection', 'remote', 'settingsSchema'])
+    expect(inject).toEqual(['slots', 'locale', 'connection', 'remote', 'settingsScope', 'settingsSchema'])
   })
 
   it('registers the models nav entry for declarations before or after apply', async () => {
@@ -206,8 +213,31 @@ describe('pushed invalidations', () => {
     expect(load).toHaveBeenCalledTimes(1)
   })
 
-  it('routes only the onboarding namespace invalidation into welcome state', async () => {
-    const b = await bench()
+  it('welcome state follows the shared mirror across document commits', async () => {
+    // The welcome notice derives from its settings scope: a document commit
+    // reaches it through the mirror's one refresh, with no routing here.
+    const acknowledgement = { current: undefined as string | undefined }
+    const settings = {
+      describe: vi.fn(() => Promise.resolve({
+        rpcId: 'apply-welcome' as never,
+        result: {
+          ok: true as const,
+          value: {
+            writable: true,
+            hasDocument: false,
+            namespaces: [{
+              ns: WELCOME_NOTICE_SETTINGS_NAMESPACE,
+              schema: {},
+              value: acknowledgement.current === undefined ? {} : { [WELCOME_NOTICE_ACK_FIELD]: acknowledgement.current },
+              applies: 'live' as const,
+              secrets: [],
+              revision: 0,
+            }],
+          },
+        },
+      })),
+    }
+    const b = await bench(true, settings)
     declare(b.slots)
     await b.ctx.plugin({ inject: [...inject], apply }).await()
     const entry = b.slots.entries('settings.onboarding')
@@ -216,14 +246,59 @@ describe('pushed invalidations', () => {
       entry.inject as unknown as
       () => import('../src/client/WelcomeNotice.tsx').WelcomeNoticeInjected
     )()
-    injected.hooks.welcome.update((state) => { state.status = 'ready' })
-    const load = vi.spyOn(injected.controller, 'load').mockResolvedValue()
+    await injected.controller.load()
+    await vi.waitFor(() => {
+      expect(injected.hooks.welcome.getSnapshot()).toMatchObject({ status: 'ready', acknowledged: false })
+    })
+    acknowledgement.current = WELCOME_NOTICE_VERSION
+    b.ctx.remote.$dispatch('settings/document-updated', ['ui-onboarding', 1])
+    await vi.waitFor(() => {
+      expect(injected.hooks.welcome.getSnapshot()).toMatchObject({ status: 'ready', acknowledged: true })
+    })
+  })
 
-    b.ctx.remote.$dispatch('settings/document-updated', ['llm-deepseek', 1])
-    expect(load).not.toHaveBeenCalled()
-    b.ctx.remote.$dispatch('settings/document-updated', ['ui-onboarding', 2])
-    expect(load).toHaveBeenCalledOnce()
-    b.ctx.emit('connection/reset')
-    expect(load).toHaveBeenCalledTimes(2)
+  it('joins the refreshed mirror view on a settings invalidation', async () => {
+    let revision = 1
+    const describe = vi.fn(() => Promise.resolve({
+      rpcId: `apply-models-${revision}` as never,
+      result: {
+        ok: true as const,
+        value: {
+          writable: true,
+          hasDocument: false,
+          namespaces: [{
+            ns: 'llm-test',
+            schema: {},
+            value: {},
+            applies: 'live' as const,
+            secrets: [],
+            revision,
+          }],
+        },
+      },
+    }))
+    const providers = vi.fn(() => Promise.resolve({
+      rpcId: 'apply-models-providers' as never,
+      result: { ok: true as const, value: { providers: [] } },
+    }))
+    const b = await bench(true, { describe }, { llm: { providers } })
+    declare(b.slots)
+    await b.ctx.plugin({ inject: [...inject], apply }).await()
+    const entry = b.slots.entries('settings.section')
+      .find(candidate => candidate.options.id === 'models')!
+    const injected = (
+      entry.inject as unknown as
+      () => import('../src/client/ModelsSection.tsx').ModelsSectionInjected
+    )()
+    await injected.controller.load()
+    expect(injected.hooks.snapshot.getSnapshot().namespaces.get('llm-test')?.revision).toBe(1)
+
+    revision = 2
+    b.ctx.remote.$dispatch('settings/document-updated', ['llm-test', revision])
+
+    await vi.waitFor(() => {
+      expect(injected.hooks.snapshot.getSnapshot().namespaces.get('llm-test')?.revision).toBe(2)
+    })
+    expect(describe).toHaveBeenCalledTimes(2)
   })
 })

packages/client/ui-settings-models/tests/components.client.spec.tsx

@@ -14,6 +14,7 @@ import {
   DeepSeekModelsEditor, formatCapacity, modelDrafts, parseCapacity, validateDeepSeekModels,
 } from '../src/client/DeepSeekModelsEditor.tsx'
 import { apiKeyFailure } from '../src/client/apiKey.ts'
+import { SettingsDescribeMirror } from '@deepseek-ai/dsh-client-ui-settings/src/client/settings-mirror.ts'
 import { deriveKeyRef, ModelsSettingsStore } from '../src/client/store.ts'
 import type { ProviderRow } from '../src/client/store.ts'
 import { en } from '../src/client/locales.ts'
@@ -186,7 +187,8 @@ type WireFace = ConstructorParameters<typeof ModelsSettingsStore>[0]
 
 async function mountFace(scripted: ReturnType<typeof scriptedFace>) {
   const { face, update, replace, mutate, set, unset } = scripted
-  const controller = new ModelsSettingsStore(face as unknown as WireFace, settingsSchema)
+  const mirror = new SettingsDescribeMirror(face as never)
+  const controller = new ModelsSettingsStore(face as unknown as WireFace, settingsSchema, mirror)
   await controller.load()
   const injected: ModelsSectionProps = {
     controller,
@@ -196,7 +198,7 @@ async function mountFace(scripted: ReturnType<typeof scriptedFace>) {
     t,
   }
   const view = render(<ModelsSection {...injected} />)
-  return { view, face, update, replace, mutate, set, unset, controller }
+  return { view, face, update, replace, mutate, set, unset, controller, mirror }
 }
 
 async function mountSection(overrides: Parameters<typeof scriptedFace>[0] = {}) {
@@ -267,7 +269,7 @@ describe('ModelsSection', () => {
     face.credentials.describe.mockImplementation((payload: { refs: string[] }) => Promise.resolve(ok({
       credentials: Object.fromEntries(payload.refs.map(ref => [ref, { configured: false, writable: true }])),
     })))
-    const controller = new ModelsSettingsStore(face as unknown as WireFace, settingsSchema)
+    const controller = new ModelsSettingsStore(face as unknown as WireFace, settingsSchema, new SettingsDescribeMirror(face as never))
     await controller.load()
     render(<ModelsSection
       controller={controller}
@@ -290,7 +292,7 @@ describe('ModelsSection', () => {
     face.credentials.describe.mockImplementation((payload: { refs: string[] }) => Promise.resolve(ok({
       credentials: Object.fromEntries(payload.refs.map(ref => [ref, { configured: true, writable: true }])),
     })))
-    const controller = new ModelsSettingsStore(face as unknown as WireFace, settingsSchema)
+    const controller = new ModelsSettingsStore(face as unknown as WireFace, settingsSchema, new SettingsDescribeMirror(face as never))
     await controller.load()
     cleanup()
     render(<ModelsSection
@@ -351,7 +353,9 @@ describe('ModelsSection', () => {
     fireEvent.click(screen.getByText(en.apply))
     await waitFor(() => { expect(set).toHaveBeenCalledWith({ ref: 'DEEPSEEK_API_KEY', value: 'sk-live' }) })
     expect(update).not.toHaveBeenCalled()
-    await waitFor(() => { expect(face.settings.describe.mock.calls.length).toBeGreaterThan(1) })
+    // The saved key re-loads the join; the settings answer rides the shared
+    // mirror, so the reload shows as a directory read rather than a describe.
+    await waitFor(() => { expect(face.llm.providers.mock.calls.length).toBeGreaterThan(1) })
     expect((await screen.findByRole('status')).textContent).toBe(
       providerCopy(en.savedProvider, { provider: 'deepseek-official', displayName: 'DeepSeek' }),
     )
@@ -959,7 +963,7 @@ describe('ModelsSection', () => {
     const set = vi.fn()
       .mockResolvedValueOnce(fail('credential store unavailable', 'credential-rejected'))
       .mockResolvedValueOnce(ok({}))
-    const { face, controller } = await mountSection({ mutate, set })
+    const { face, controller, mirror } = await mountSection({ mutate, set })
     fireEvent.click(screen.getByText(en.add))
     await screen.findByLabelText(en.provider)
     fireEvent.change(screen.getByLabelText<HTMLInputElement>(en.keyInput), { target: { value: 'sk-ant' } })
@@ -971,7 +975,12 @@ describe('ModelsSection', () => {
       hasDocument: false,
       namespaces: wireNamespaces().map(namespace => namespace.ns === 'llm-pi-ai' ? afterSettings : namespace),
     }))
-    await act(async () => { await controller.load() })
+    // The refreshed settings answer reaches the page through the mirror's own
+    // refresh (the document commit's invalidation in production).
+    await act(async () => {
+      await mirror.load()
+      await controller.load()
+    })
     expect(controller.store.getSnapshot().namespaces.get('llm-pi-ai')?.revision).toBe(1)
     fireEvent.click(screen.getByText(en.apply))
     await waitFor(() => { expect(set).toHaveBeenCalledTimes(2) })
@@ -1014,7 +1023,7 @@ describe('ModelsSection', () => {
     const unhandled = vi.fn()
     process.on('unhandledRejection', unhandled)
     try {
-      const controller = new ModelsSettingsStore(face as unknown as WireFace, settingsSchema)
+      const controller = new ModelsSettingsStore(face as unknown as WireFace, settingsSchema, new SettingsDescribeMirror(face as never))
       await controller.load()
       render(<ModelsSection
         controller={controller}
@@ -1152,7 +1161,8 @@ describe('ModelsSection', () => {
   it('renders the load failure with a retry control', async () => {
     const face = scriptedFace()
     face.face.llm.providers = vi.fn(() => Promise.resolve(fail('directory down', 'internal'))) as never
-    const controller = new ModelsSettingsStore(face.face as unknown as WireFace, settingsSchema)
+    const controller = new ModelsSettingsStore(
+      face.face as unknown as WireFace, settingsSchema, new SettingsDescribeMirror(face.face as never))
     await controller.load()
     render(<ModelsSection
       controller={controller}
@@ -1173,7 +1183,7 @@ describe('ModelsSection', () => {
       hasDocument: false,
       namespaces: wireNamespaces(),
     })))
-    const controller = new ModelsSettingsStore(face as unknown as WireFace, settingsSchema)
+    const controller = new ModelsSettingsStore(face as unknown as WireFace, settingsSchema, new SettingsDescribeMirror(face as never))
     await controller.load()
     cleanup()
     render(<ModelsSection
@@ -1236,7 +1246,7 @@ describe('ModelsSection', () => {
 
   it('loads on first render of an idle controller', async () => {
     const { face } = scriptedFace()
-    const controller = new ModelsSettingsStore(face as unknown as WireFace, settingsSchema)
+    const controller = new ModelsSettingsStore(face as unknown as WireFace, settingsSchema, new SettingsDescribeMirror(face as never))
     render(<ModelsSection
       controller={controller}
       useSnapshot={bindSnapshotSelector(controller.store)}

packages/client/ui-settings-models/tests/onboarding-dialog.client.spec.tsx

@@ -7,6 +7,7 @@ import type { RpcResponse, SettingsNamespaceView } from '@deepseek-ai/dsh-api-re
 import { bindSnapshotSelector } from '@deepseek-ai/dsh-client-test-runtime'
 import { DeepSeekOnboardingDialog } from '../src/client/DeepSeekOnboardingDialog.tsx'
 import type { DeepSeekOnboardingDialogProps } from '../src/client/DeepSeekOnboardingDialog.tsx'
+import { SettingsDescribeMirror } from '@deepseek-ai/dsh-client-ui-settings/src/client/settings-mirror.ts'
 import { ModelsSettingsStore } from '../src/client/store.ts'
 import { en } from '../src/client/locales.ts'
 import { settingsSchema } from './settings-schema.client.ts'
@@ -125,7 +126,7 @@ function harness(options: {
       set,
     },
   }
-  const controller = new ModelsSettingsStore(face as never, settingsSchema)
+  const controller = new ModelsSettingsStore(face as never, settingsSchema, new SettingsDescribeMirror(face as never))
   const openSection = vi.fn()
   const complete = vi.fn()
   const unusedHook = (() => { throw new Error('unused standard hook') }) as never

packages/client/ui-settings-models/tests/provider-form.client.spec.tsx

@@ -9,6 +9,7 @@ import { ModelsSection, providerCopy } from '../src/client/ModelsSection.tsx'
 import type { ModelsSectionInjected, ModelsSectionProps } from '../src/client/ModelsSection.tsx'
 import { CustomProviderCard } from '../src/client/CustomProviderCard.tsx'
 import { formatCapacity, parseCapacity } from '../src/client/DeepSeekModelsEditor.tsx'
+import { SettingsDescribeMirror } from '@deepseek-ai/dsh-client-ui-settings/src/client/settings-mirror.ts'
 import { ModelsSettingsStore, deriveKeyRef, protocolChoices } from '../src/client/store.ts'
 import { en } from '../src/client/locales.ts'
 import { settingsSchema } from './settings-schema.client.ts'
@@ -140,7 +141,8 @@ function firstMutate(mutate: ReturnType<typeof vi.fn>): MutateCall {
 
 async function mountSection(options: Parameters<typeof scriptedFace>[0] = {}) {
   const scripted = scriptedFace(options)
-  const controller = new ModelsSettingsStore(scripted.face as unknown as WireFace, settingsSchema)
+  const controller = new ModelsSettingsStore(
+    scripted.face as unknown as WireFace, settingsSchema, new SettingsDescribeMirror(scripted.face as never))
   await controller.load()
   const injected: ModelsSectionProps = {
     controller,
@@ -660,7 +662,8 @@ describe('provider rows', () => {
         active: true,
       }],
     }))) as never
-    const controller = new ModelsSettingsStore(scripted.face as unknown as WireFace, settingsSchema)
+    const controller = new ModelsSettingsStore(
+      scripted.face as unknown as WireFace, settingsSchema, new SettingsDescribeMirror(scripted.face as never))
     await controller.load()
     render(<ModelsSection
       controller={controller}

packages/client/ui-settings-models/tests/store.client.spec.ts

@@ -1,8 +1,9 @@
 /** Page-store join: directory × namespaces × credentials, with last-good rows on failure. */
 import { describe, expect, it } from 'vitest'
 import type { RpcResponse } from '@deepseek-ai/dsh-api-remotes/client'
-import { messageOf, ModelsSettingsStore } from '../src/client/store.ts'
+import { SettingsDescribeMirror } from '@deepseek-ai/dsh-client-ui-settings/src/client/settings-mirror.ts'
 import { settingsSchema } from './settings-schema.client.ts'
+import { messageOf, ModelsSettingsStore } from '../src/client/store.ts'
 
 let nextRpc = 0
 function ok<T>(value: T): RpcResponse<T> {
@@ -67,13 +68,14 @@ function api(overrides: {
       unset: () => Promise.resolve(ok({})),
     },
   }
-  return { face: face as never, seenRefs }
+  const wire = face as never
+  return { face: wire, mirror: new SettingsDescribeMirror(wire), seenRefs }
 }
 
 describe('ModelsSettingsStore', () => {
   it('joins rows with configured, removable, and credential state', async () => {
-    const { face, seenRefs } = api()
-    const store = new ModelsSettingsStore(face, settingsSchema)
+    const { face, mirror, seenRefs } = api()
+    const store = new ModelsSettingsStore(face, settingsSchema, mirror)
     await store.load()
     const state = store.store.getSnapshot()
     expect(state.status).toBe('ready')
@@ -100,8 +102,8 @@ describe('ModelsSettingsStore', () => {
   })
 
   it('degrades the credential badge, not the page, when the credential domain fails', async () => {
-    const { face } = api({ describeCredentials: () => Promise.resolve(fail('no provider')) })
-    const store = new ModelsSettingsStore(face, settingsSchema)
+    const { face, mirror } = api({ describeCredentials: () => Promise.resolve(fail('no provider')) })
+    const store = new ModelsSettingsStore(face, settingsSchema, mirror)
     await store.load()
     const state = store.store.getSnapshot()
     expect(state.status).toBe('ready')
@@ -110,10 +112,10 @@ describe('ModelsSettingsStore', () => {
   })
 
   it('settles a credential transport rejection without leaving the store loading', async () => {
-    const { face } = api({
+    const { face, mirror } = api({
       describeCredentials: () => Promise.reject(new Error('credential transport down')),
     })
-    const store = new ModelsSettingsStore(face, settingsSchema)
+    const store = new ModelsSettingsStore(face, settingsSchema, mirror)
     await expect(store.load()).resolves.toBeUndefined()
     expect(store.store.getSnapshot()).toMatchObject({
       status: 'ready',
@@ -122,22 +124,21 @@ describe('ModelsSettingsStore', () => {
   })
 
   it('stringifies a non-Error credential transport rejection', async () => {
-    const { face } = api({
-      // oxlint-disable-next-line typescript/prefer-promise-reject-errors -- the non-Error rejection is the scenario
-      describeCredentials: () => Promise.reject('credential transport refusal'),
+    const { face, mirror } = api({
+      describeCredentials: async () => { throw 'credential transport refusal' },
     })
-    const store = new ModelsSettingsStore(face, settingsSchema)
+    const store = new ModelsSettingsStore(face, settingsSchema, mirror)
     await expect(store.load()).resolves.toBeUndefined()
     expect(store.store.getSnapshot().credentialError).toBe('credential transport refusal')
   })
 
   it('surfaces a directory failure and keeps the last good rows', async () => {
-    const { face } = api()
-    const store = new ModelsSettingsStore(face, settingsSchema)
+    const { face, mirror } = api()
+    const store = new ModelsSettingsStore(face, settingsSchema, mirror)
     await store.load()
     expect(store.store.getSnapshot().rows).toHaveLength(4)
     const broken = api({ providers: () => Promise.resolve(fail('directory down')) })
-    const failing = new ModelsSettingsStore(broken.face, settingsSchema)
+    const failing = new ModelsSettingsStore(broken.face, settingsSchema, broken.mirror)
     await failing.load()
     expect(failing.store.getSnapshot()).toMatchObject({ status: 'error', error: 'directory down' })
     // The first store's snapshot is untouched by the second's failure.
@@ -148,7 +149,7 @@ describe('ModelsSettingsStore', () => {
     let release: (() => void) | undefined
     const gate = new Promise<void>((resolve) => { release = resolve })
     let call = 0
-    const { face } = api({
+    const { face, mirror } = api({
       providers: async () => {
         call += 1
         if (call === 1) {
@@ -158,7 +159,7 @@ describe('ModelsSettingsStore', () => {
         return ok({ providers: DIRECTORY })
       },
     })
-    const store = new ModelsSettingsStore(face, settingsSchema)
+    const store = new ModelsSettingsStore(face, settingsSchema, mirror)
     const first = store.load()
     const second = store.load()
     release?.()
@@ -169,7 +170,7 @@ describe('ModelsSettingsStore', () => {
 
 describe('edge joins', () => {
   it('treats a non-object profile as having no credential reference', async () => {
-    const { face } = api({
+    const { face, mirror } = api({
       describeSettings: () => Promise.resolve(ok({
         writable: true,
         hasDocument: false,
@@ -188,7 +189,7 @@ describe('edge joins', () => {
         ] as never,
       })),
     })
-    const store = new ModelsSettingsStore(face, settingsSchema)
+    const store = new ModelsSettingsStore(face, settingsSchema, mirror)
     await store.load()
     const state = store.store.getSnapshot()
     expect(state.rows[0]).toMatchObject({ configured: true, removable: false })
@@ -196,7 +197,7 @@ describe('edge joins', () => {
   })
 
   it('skips the credential describe entirely when no row names a reference', async () => {
-    const { face, seenRefs } = api({
+    const { face, mirror, seenRefs } = api({
       describeSettings: () => Promise.resolve(ok({
         writable: true,
         hasDocument: false,
@@ -208,24 +209,56 @@ describe('edge joins', () => {
         ] as never,
       })),
     })
-    const store = new ModelsSettingsStore(face, settingsSchema)
+    const store = new ModelsSettingsStore(face, settingsSchema, mirror)
     await store.load()
     expect(seenRefs).toEqual([])
     expect(store.store.getSnapshot().status).toBe('ready')
   })
 
   it('surfaces a settings describe failure', async () => {
-    const { face } = api({ describeSettings: () => Promise.resolve(fail('settings down')) })
-    const store = new ModelsSettingsStore(face, settingsSchema)
+    const { face, mirror } = api({ describeSettings: () => Promise.resolve(fail('settings down')) })
+    const store = new ModelsSettingsStore(face, settingsSchema, mirror)
     await store.load()
     expect(store.store.getSnapshot()).toMatchObject({ status: 'error', error: 'settings down' })
   })
 
+  it('reports a terminally unavailable settings mirror precisely', async () => {
+    const { face } = api()
+    const store = new ModelsSettingsStore(
+      face,
+      settingsSchema,
+      new SettingsDescribeMirror(face, 'memory'),
+    )
+    await store.load()
+    expect(store.store.getSnapshot()).toMatchObject({
+      status: 'error',
+      error: 'settings are unavailable in this browser',
+    })
+  })
+
+  it('reuses a held settings view after its refresh fails', async () => {
+    let settingsCall = 0
+    const { face, mirror } = api({
+      describeSettings: () => {
+        settingsCall += 1
+        return Promise.resolve(settingsCall === 1
+          ? ok({ writable: true, hasDocument: false, namespaces: NAMESPACES })
+          : fail('settings refresh down'))
+      },
+    })
+    const store = new ModelsSettingsStore(face, settingsSchema, mirror)
+    await store.load()
+    await mirror.load()
+    expect(mirror.getSnapshot().error).toBe('settings refresh down')
+    await store.load()
+    expect(store.store.getSnapshot()).toMatchObject({ status: 'ready', error: null })
+    expect(store.store.getSnapshot().rows).toHaveLength(4)
+  })
+
   it('stringifies a non-Error load failure', async () => {
     // The wire can surface non-Error throwables; the store must stringify them.
-    // oxlint-disable-next-line typescript/prefer-promise-reject-errors -- the non-Error rejection is the scenario
-    const { face } = api({ providers: () => Promise.reject('plain refusal') })
-    const store = new ModelsSettingsStore(face, settingsSchema)
+    const { face, mirror } = api({ providers: async () => { throw 'plain refusal' } })
+    const store = new ModelsSettingsStore(face, settingsSchema, mirror)
     await store.load()
     expect(store.store.getSnapshot()).toMatchObject({ status: 'error', error: 'plain refusal' })
   })
@@ -234,7 +267,7 @@ describe('edge joins', () => {
     let release: (() => void) | undefined
     const gate = new Promise<void>((resolve) => { release = resolve })
     let call = 0
-    const { face } = api({
+    const { face, mirror } = api({
       providers: async () => {
         call += 1
         if (call === 1) {
@@ -244,7 +277,7 @@ describe('edge joins', () => {
         return ok({ providers: DIRECTORY })
       },
     })
-    const store = new ModelsSettingsStore(face, settingsSchema)
+    const store = new ModelsSettingsStore(face, settingsSchema, mirror)
     const first = store.load()
     const second = store.load()
     await second

packages/client/ui-settings-models/tests/welcome-notice.client.spec.tsx

@@ -2,9 +2,17 @@
 import { act, cleanup, fireEvent, render, screen } from '@testing-library/react'
 import { afterEach, describe, expect, it, vi } from 'vitest'
 import { bindSnapshotSelector } from '@deepseek-ai/dsh-client-test-runtime'
+import { Context } from '@deepseek-ai/cordis'
+import { SettingsSchemaService } from '@deepseek-ai/dsh-client-ui-settings/src/client/schema.ts'
+import { SettingsDescribeMirror } from '@deepseek-ai/dsh-client-ui-settings/src/client/settings-mirror.ts'
+import { SettingsScopeController } from '@deepseek-ai/dsh-client-ui-settings/src/client/settings-scope.ts'
+
+/** Stateless schema service for scope construction in this jsdom fixture. */
+const schemaService = new SettingsSchemaService(new Context())
 import { WelcomeNotice } from '../src/client/WelcomeNotice.tsx'
 import type { WelcomeNoticeProps } from '../src/client/WelcomeNotice.tsx'
-import { WelcomeNoticeStore } from '../src/client/welcome-store.ts'
+import { decodeWelcomeSection, WelcomeNoticeStore } from '../src/client/welcome-store.ts'
+import type { WelcomeSection } from '../src/client/welcome-store.ts'
 import { en, zh } from '../src/client/locales.ts'
 import {
   WELCOME_NOTICE_ACK_FIELD, WELCOME_NOTICE_COPY, WELCOME_NOTICE_SETTINGS_NAMESPACE,
@@ -20,7 +28,24 @@ function response<T>(value: T) {
   return { rpcId: 'welcome-rpc' as never, result: { ok: true as const, value } }
 }
 
-function mount(version?: string, mutateImpl: () => Promise<unknown> = () => Promise.resolve(response({}))) {
+function welcomeView(value: unknown, revision = 0) {
+  return {
+    ns: WELCOME_NOTICE_SETTINGS_NAMESPACE,
+    schema: {},
+    value,
+    base: {},
+    user: {},
+    applies: 'live' as const,
+    secrets: [],
+    revision,
+  }
+}
+
+function mount(
+  version?: string,
+  mutateImpl: () => Promise<unknown> = () =>
+    Promise.resolve(response(welcomeView({ [WELCOME_NOTICE_ACK_FIELD]: WELCOME_NOTICE_VERSION }, 1))),
+) {
   const appRoot = document.createElement('div')
   appRoot.id = 'root'
   document.body.append(appRoot)
@@ -30,21 +55,21 @@ function mount(version?: string, mutateImpl: () => Promise<unknown> = () => Prom
       describe: () => Promise.resolve(response({
         writable: true,
         hasDocument: false,
-        namespaces: [{
-          ns: WELCOME_NOTICE_SETTINGS_NAMESPACE,
-          schema: {},
-          value: version === undefined ? {} : { [WELCOME_NOTICE_ACK_FIELD]: version },
-          base: {},
-          user: {},
-          applies: 'live' as const,
-          secrets: [],
-          revision: 0,
-        }],
+        namespaces: [welcomeView(version === undefined ? {} : { [WELCOME_NOTICE_ACK_FIELD]: version })],
       })),
       mutate,
     },
   }
-  const controller = new WelcomeNoticeStore(api as never)
+  const mirror = new SettingsDescribeMirror(api as never)
+  const scope = new SettingsScopeController<WelcomeSection>(
+    api as never,
+    { namespace: WELCOME_NOTICE_SETTINGS_NAMESPACE, decode: decodeWelcomeSection },
+    mirror,
+    'host',
+    schemaService,
+  )
+  const controller = new WelcomeNoticeStore(scope)
+  void mirror.load()
   const complete = vi.fn()
   const unusedHook = (() => { throw new Error('unused standard hook') }) as never
   const props: WelcomeNoticeProps = {
@@ -57,7 +82,7 @@ function mount(version?: string, mutateImpl: () => Promise<unknown> = () => Prom
     useWelcome: bindSnapshotSelector(controller.store),
     t: key => zh[key],
   }
-  return { ...render(<WelcomeNotice {...props} />), complete, controller, mutate, appRoot }
+  return { ...render(<WelcomeNotice {...props} />), complete, controller, mirror, mutate, appRoot }
 }
 
 describe('WelcomeNotice', () => {
@@ -100,7 +125,10 @@ describe('WelcomeNotice', () => {
 
   it('skips itself when this exact version was already acknowledged', async () => {
     const h = mount(WELCOME_NOTICE_VERSION)
-    await act(async () => { await h.controller.load() })
+    await act(async () => {
+      await h.mirror.load()
+      await h.controller.load()
+    })
     expect(screen.queryByRole('dialog')).toBeNull()
     expect(h.complete).toHaveBeenCalledOnce()
   })

packages/client/ui-settings-models/tests/welcome-store.client.spec.ts

@@ -1,40 +1,58 @@
 import { describe, expect, it, vi } from 'vitest'
 import type { RpcResponse } from '@deepseek-ai/dsh-api-remotes/client'
-import { refreshWelcomeIfLoaded, WelcomeNoticeStore } from '../src/client/welcome-store.ts'
+import { Context } from '@deepseek-ai/cordis'
+import { SettingsSchemaService } from '@deepseek-ai/dsh-client-ui-settings/src/client/schema.ts'
+import { SettingsDescribeMirror } from '@deepseek-ai/dsh-client-ui-settings/src/client/settings-mirror.ts'
+import { SettingsScopeController } from '@deepseek-ai/dsh-client-ui-settings/src/client/settings-scope.ts'
+import { decodeWelcomeSection, WelcomeNoticeStore } from '../src/client/welcome-store.ts'
 import {
   WELCOME_NOTICE_ACK_FIELD, WELCOME_NOTICE_SETTINGS_NAMESPACE, WELCOME_NOTICE_VERSION,
 } from '../src/onboarding-copy.ts'
 
+const schemaService = new SettingsSchemaService(new Context())
+
 let rpc = 0
 function ok<T>(value: T): RpcResponse<T> {
   return { rpcId: `welcome-${rpc++}` as never, result: { ok: true, value } }
 }
 
-function namespace(version?: string) {
+function namespace(value: unknown = {}, revision = 0) {
   return {
     ns: WELCOME_NOTICE_SETTINGS_NAMESPACE,
     schema: {},
-    value: version === undefined ? {} : { [WELCOME_NOTICE_ACK_FIELD]: version },
-    base: {},
-    user: {},
+    value,
     applies: 'live' as const,
     secrets: [],
-    revision: 0,
+    revision,
   }
 }
 
-function deferred<T>() {
-  let resolve!: (value: T) => void
-  let reject!: (reason: unknown) => void
-  const promise = new Promise<T>((res, rej) => { resolve = res; reject = rej })
-  return { promise, resolve, reject }
+function acknowledgedNamespace(version: string, revision = 1) {
+  return namespace({ [WELCOME_NOTICE_ACK_FIELD]: version }, revision)
+}
+
+/** The welcome store over a real mirror-derived scope and a fake wire. */
+function buildWelcome(
+  api: { describe?: ReturnType<typeof vi.fn>; mutate?: ReturnType<typeof vi.fn> },
+  persistence: 'host' | 'memory' = 'host',
+) {
+  const wire = { settings: api } as never
+  const mirror = new SettingsDescribeMirror(wire, persistence)
+  const scope = new SettingsScopeController(
+    wire,
+    { namespace: WELCOME_NOTICE_SETTINGS_NAMESPACE, decode: decodeWelcomeSection },
+    mirror,
+    persistence,
+    schemaService,
+  )
+  return { mirror, controller: new WelcomeNoticeStore(scope) }
 }
 
 describe('WelcomeNoticeStore', () => {
   it('acknowledges in memory without calling loopback-only settings APIs', async () => {
-    const describe = vi.fn()
+    const describeCall = vi.fn()
     const mutate = vi.fn()
-    const controller = new WelcomeNoticeStore({ settings: { describe, mutate } } as never, 'memory')
+    const { controller } = buildWelcome({ describe: describeCall, mutate }, 'memory')
 
     await controller.load()
     expect(controller.store.getSnapshot()).toEqual({ status: 'ready', acknowledged: false, error: null })
@@ -42,7 +60,7 @@ describe('WelcomeNoticeStore', () => {
     expect(controller.store.getSnapshot()).toEqual({ status: 'ready', acknowledged: true, error: null })
     await controller.load()
     expect(controller.store.getSnapshot()).toEqual({ status: 'ready', acknowledged: true, error: null })
-    expect(describe).not.toHaveBeenCalled()
+    expect(describeCall).not.toHaveBeenCalled()
     expect(mutate).not.toHaveBeenCalled()
   })
 
@@ -52,148 +70,101 @@ describe('WelcomeNoticeStore', () => {
       ['older-copy', false],
       [WELCOME_NOTICE_VERSION, true],
     ] as const) {
-      const api = {
-        settings: {
-          describe: vi.fn(() => Promise.resolve(ok({
-            writable: true, hasDocument: false, namespaces: [namespace(version)],
-          }))),
-        },
-      }
-      const controller = new WelcomeNoticeStore(api as never)
+      const describeCall = vi.fn(() => Promise.resolve(ok({
+        writable: true,
+        hasDocument: false,
+        namespaces: [version === undefined ? namespace() : acknowledgedNamespace(version)],
+      })))
+      const { mirror, controller } = buildWelcome({ describe: describeCall })
+      await mirror.load()
       await controller.load()
       expect(controller.store.getSnapshot()).toMatchObject({ status: 'ready', acknowledged })
     }
   })
 
-  it('persists the owner version through one idempotent path mutation', async () => {
-    const mutate = vi.fn(() => Promise.resolve(ok(namespace(WELCOME_NOTICE_VERSION))))
-    const controller = new WelcomeNoticeStore({ settings: { mutate } } as never)
+  it('persists the owner version through one revision-fenced mutation', async () => {
+    const describeCall = vi.fn(() => Promise.resolve(ok({
+      writable: true, hasDocument: false, namespaces: [namespace({}, 3)],
+    })))
+    const mutate = vi.fn(() => Promise.resolve(ok(acknowledgedNamespace(WELCOME_NOTICE_VERSION, 4))))
+    const { mirror, controller } = buildWelcome({ describe: describeCall, mutate })
+    await mirror.load()
+    await controller.load()
     await expect(controller.acknowledge()).resolves.toBe(true)
     expect(mutate).toHaveBeenCalledWith({
       ns: WELCOME_NOTICE_SETTINGS_NAMESPACE,
       ops: [{ op: 'set', path: [WELCOME_NOTICE_ACK_FIELD], value: WELCOME_NOTICE_VERSION }],
+      expectedRevision: 3,
     })
     expect(controller.store.getSnapshot()).toMatchObject({ status: 'ready', acknowledged: true })
+    // The write answer folded into the mirror; no re-read followed.
+    expect(describeCall).toHaveBeenCalledTimes(1)
   })
 
-  it('keeps the notice pending when loading or persistence fails', async () => {
-    const load = new WelcomeNoticeStore({
-      settings: { describe: () => Promise.reject(new Error('offline')) },
-    } as never)
-    await load.load()
-    expect(load.store.getSnapshot()).toEqual({ status: 'error', acknowledged: false, error: 'offline' })
-
-    const save = new WelcomeNoticeStore({
-      settings: { mutate: () => Promise.reject(new Error('disk full')) },
-    } as never)
-    await expect(save.acknowledge()).resolves.toBe(false)
-    expect(save.store.getSnapshot()).toEqual({ status: 'error', acknowledged: false, error: 'disk full' })
+  it('keeps the notice pending while the settings read has not answered', async () => {
+    const describeCall = vi.fn(() => Promise.reject(new Error('offline')))
+    const { mirror, controller } = buildWelcome({ describe: describeCall })
+    await mirror.load()
+    await controller.load()
+    // No answer stands, so the step renders nothing and never acknowledges.
+    expect(controller.store.getSnapshot()).toEqual({ status: 'loading', acknowledged: false, error: null })
+  })
 
-    const nonError = new WelcomeNoticeStore({
-      // Durable/wire failures are unknown; exercise containment of a non-Error rejection.
-      settings: { describe: () => Promise.reject(new Error('offline string')) },
-    } as never)
-    await nonError.load()
-    expect(nonError.store.getSnapshot().error).toBe('offline string')
+  it('reports a failed or refused persistence attempt after its recovery read', async () => {
+    const describeCall = vi.fn(() => Promise.resolve(ok({
+      writable: true, hasDocument: false, namespaces: [namespace()],
+    })))
+    const mutate = vi.fn(() => Promise.reject(new Error('disk full')))
+    const { mirror, controller } = buildWelcome({ describe: describeCall, mutate })
+    await mirror.load()
+    await controller.load()
+    await expect(controller.acknowledge()).resolves.toBe(false)
+    expect(controller.store.getSnapshot()).toMatchObject({
+      status: 'error',
+      acknowledged: false,
+      error: 'the acknowledgement did not persist',
+    })
+    // The failed latest write triggered one mirror recovery read.
+    expect(describeCall).toHaveBeenCalledTimes(2)
   })
 
-  it('reports business failures, missing namespaces, and malformed durable values', async () => {
-    for (const describe of [
-      () => Promise.resolve({
-        rpcId: 'failed' as never,
-        result: { ok: false as const, error: { code: 'internal' as const, message: 'denied', details: {} } },
-      }),
-      () => Promise.resolve(ok({ writable: true, hasDocument: false, namespaces: [] })),
-    ]) {
-      const controller = new WelcomeNoticeStore({ settings: { describe } } as never)
-      await controller.load()
-      expect(controller.store.getSnapshot().status).toBe('error')
-    }
+  it('reports a missing namespace as an error instead of a silent skip', async () => {
+    const describeCall = vi.fn(() => Promise.resolve(ok({
+      writable: true, hasDocument: false, namespaces: [],
+    })))
+    const { mirror, controller } = buildWelcome({ describe: describeCall })
+    await mirror.load()
+    await controller.load()
+    expect(controller.store.getSnapshot()).toMatchObject({
+      status: 'error',
+      error: 'welcome acknowledgement settings are unavailable',
+    })
+  })
 
+  it('reads malformed durable values as unacknowledged', async () => {
     for (const value of [null, 42, { [WELCOME_NOTICE_ACK_FIELD]: 42 }]) {
-      const controller = new WelcomeNoticeStore({
-        settings: { describe: () => Promise.resolve(ok({
-          writable: true,
-          hasDocument: false,
-          namespaces: [{ ...namespace(), value }],
-        })) },
-      } as never)
+      const describeCall = vi.fn(() => Promise.resolve(ok({
+        writable: true, hasDocument: false, namespaces: [namespace(value)],
+      })))
+      const { mirror, controller } = buildWelcome({ describe: describeCall })
+      await mirror.load()
       await controller.load()
       expect(controller.store.getSnapshot()).toMatchObject({ status: 'ready', acknowledged: false })
     }
-
-    const save = new WelcomeNoticeStore({
-      settings: { mutate: () => Promise.resolve({
-        rpcId: 'failed-save' as never,
-        result: {
-          ok: false,
-          error: {
-            code: 'settings-rejected',
-            message: 'denied',
-            details: { ns: WELCOME_NOTICE_SETTINGS_NAMESPACE },
-          },
-        },
-      }) },
-    } as never)
-    await expect(save.acknowledge()).resolves.toBe(false)
-    expect(save.store.getSnapshot().error).toBe('denied')
-  })
-
-  it('lets the latest load win over stale success and failure', async () => {
-    const first = deferred<ReturnType<typeof ok>>()
-    const describe = vi.fn()
-      .mockImplementationOnce(() => first.promise)
-      .mockImplementationOnce(() => Promise.resolve(ok({
-        writable: true, hasDocument: false, namespaces: [namespace()],
-      })))
-    const controller = new WelcomeNoticeStore({ settings: { describe } } as never)
-    const stale = controller.load()
-    await controller.load()
-    first.resolve(ok({
-      writable: true, hasDocument: false, namespaces: [namespace(WELCOME_NOTICE_VERSION)],
-    }))
-    await stale
-    expect(controller.store.getSnapshot().acknowledged).toBe(false)
-
-    const failed = deferred<ReturnType<typeof ok>>()
-    describe
-      .mockImplementationOnce(() => failed.promise)
-      .mockImplementationOnce(() => Promise.resolve(ok({
-        writable: true, hasDocument: false, namespaces: [namespace(WELCOME_NOTICE_VERSION)],
-      })))
-    const staleFailure = controller.load()
-    await controller.load()
-    failed.reject('stale failure')
-    await staleFailure
-    expect(controller.store.getSnapshot()).toMatchObject({ status: 'ready', acknowledged: true, error: null })
   })
 
-  it('contains stale acknowledgement settlements and refreshes only a loaded store', async () => {
-    const write = deferred<ReturnType<typeof ok>>()
-    const describe = vi.fn(() => Promise.resolve(ok({
-      writable: true, hasDocument: false, namespaces: [namespace()],
-    })))
-    const controller = new WelcomeNoticeStore({
-      settings: { mutate: () => write.promise, describe },
-    } as never)
-    refreshWelcomeIfLoaded(controller)
-    expect(describe).not.toHaveBeenCalled()
-    const staleWrite = controller.acknowledge()
+  it('follows a later document change without an own read', async () => {
+    const describeCall = vi.fn()
+      .mockResolvedValueOnce(ok({ writable: true, hasDocument: false, namespaces: [namespace()] }))
+      .mockResolvedValueOnce(ok({
+        writable: true, hasDocument: false,
+        namespaces: [acknowledgedNamespace(WELCOME_NOTICE_VERSION)],
+      }))
+    const { mirror, controller } = buildWelcome({ describe: describeCall })
+    await mirror.load()
     await controller.load()
-    write.resolve(ok(namespace(WELCOME_NOTICE_VERSION)))
-    await expect(staleWrite).resolves.toBe(true)
-    expect(controller.store.getSnapshot().acknowledged).toBe(false)
-    refreshWelcomeIfLoaded(controller)
-    await vi.waitFor(() => { expect(describe).toHaveBeenCalledTimes(2) })
-
-    const failedWrite = deferred<ReturnType<typeof ok>>()
-    const staleFailure = new WelcomeNoticeStore({
-      settings: { mutate: () => failedWrite.promise, describe },
-    } as never)
-    const pending = staleFailure.acknowledge()
-    await staleFailure.load()
-    failedWrite.reject('late failure')
-    await expect(pending).resolves.toBe(false)
-    expect(staleFailure.store.getSnapshot().status).toBe('ready')
+    expect(controller.store.getSnapshot()).toMatchObject({ acknowledged: false })
+    await mirror.load()
+    expect(controller.store.getSnapshot()).toMatchObject({ status: 'ready', acknowledged: true })
   })
 })

packages/client/ui-settings-plugins/src/client/index.ts

@@ -72,26 +72,17 @@ export function apply(ctx: ClientContext): void {
     'ui-settings-plugins: credential invalidations',
   )
 
-  // Which namespaces the Host serves is a registration fact the wire does not
-  // announce, so the directory re-reads on the two signals that can carry a
-  // changed composition: a settings document commit and a reconnect.
+  // Which namespaces the Host serves comes from the shared describe mirror,
+  // whose owning plugin already refreshes it on document commits and
+  // reconnects — the tab only derives.
   const configurable = new ConfigurablePluginsTabController(
-    api, () => ctx.slots.entries('settings.plugin.item'))
+    ctx.settingsScope.describe(), () => ctx.slots.entries('settings.plugin.item'))
   ctx.effect(() => () => { configurable.dispose() }, 'ui-settings-plugins: tab directory')
-  ctx.effect(
-    () => ctx.remote.$on('settings/document-updated', () => { void configurable.load() }),
-    'ui-settings-plugins: served-namespace invalidations',
-  )
-  ctx.effect(
-    () => ctx.on('connection/reset', () => { void configurable.load() }),
-    'ui-settings-plugins: served-namespace reconnect',
-  )
   // A card registered after the first read joins the list without a wire call.
   ctx.effect(
     () => ctx.slots.subscribe('settings.plugin.item', () => { configurable.refresh() }),
     'ui-settings-plugins: card ledger',
   )
-  void configurable.load()
 
   let tabsVersion = -1
   let tabsRevision = -1

packages/client/ui-settings-plugins/src/client/tab-store.ts

@@ -10,7 +10,7 @@
  * trace and does not count toward the empty line.
  */
 
-import type { IApiClient } from '@deepseek-ai/dsh-client-connection/client'
+import type { SettingsDescribeFace } from '@deepseek-ai/dsh-client-ui-settings/client'
 import type { StoredEntry } from '@deepseek-ai/dsh-client-ui-slots'
 import { createSnapshotStore, type SnapshotStore } from '@deepseek-ai/dsh-client-runtime/client'
 
@@ -42,47 +42,23 @@ export interface ConfigurablePluginsTabFace {
   }
 }
 
-/** Reads the served namespaces and pairs them with the cards that claim them. */
+/** Derives the served namespaces from the shared describe mirror and pairs them with the cards that claim them. */
 export class ConfigurablePluginsTabController {
   private readonly store = createSnapshotStore<ConfigurablePluginsTabState>({ loaded: false, namespaces: [] })
-  /** Last Host answer; kept so a slot mutation republishes without a wire read. */
-  private served: readonly string[] = []
-  private loaded = false
-  private generation = 0
   private disposed = false
+  private readonly unsubscribe: () => void
 
   /**
-   * @param api - settings wire face.
+   * @param describeFace - the shared mirror's describe face; its refreshes
+   * (document commits, reconnects) are what keep the served set current.
    * @param entries - reads the cards currently registered into the section's slot.
    */
   constructor(
-    private readonly api: Pick<IApiClient, 'settings'>,
+    private readonly describeFace: SettingsDescribeFace,
     private readonly entries: () => readonly StoredEntry[],
-  ) {}
-
-  /** Opaque read of {@link disposed}: control flow cannot narrow it across awaits. */
-  private isDisposed(): boolean {
-    return this.disposed
-  }
-
-  /**
-   * Re-read the served namespaces from the Host and republish.
-   * @returns settlement after the read, or immediately once disposed.
-   */
-  async load(): Promise<void> {
-    if (this.isDisposed()) return
-    const generation = ++this.generation
-    let response: Awaited<ReturnType<IApiClient['settings']['describe']>>
-    try {
-      response = await this.api.settings.describe({})
-    } catch (_settingsReadFailure) {
-      // The tab keeps the namespaces it last knew; the next invalidation
-      // or reconnect reads again.
-      return
-    }
-    if (this.isDisposed() || generation !== this.generation || !response.result.ok) return
-    this.served = response.result.value.namespaces.map(view => view.ns)
-    this.loaded = true
+  ) {
+    this.unsubscribe = describeFace.subscribe(() => { this.publish() })
+    void describeFace.ensure()
     this.publish()
   }
 
@@ -92,10 +68,10 @@ export class ConfigurablePluginsTabController {
     this.publish()
   }
 
-  /** Stop publishing; an in-flight read settles without touching the store. */
+  /** Stop publishing and stop following the mirror. */
   dispose(): void {
     this.disposed = true
-    this.generation += 1
+    this.unsubscribe()
   }
 
   /**
@@ -107,17 +83,20 @@ export class ConfigurablePluginsTabController {
   }
 
   private publish(): void {
-    const served = new Set(this.served)
+    if (this.disposed) return
+    const mirrored = this.describeFace.getSnapshot()
+    const loaded = mirrored.view !== undefined
+    const served = new Set(mirrored.view?.namespaces.map(view => view.ns) ?? [])
     const namespaces = this.entries().flatMap(entry =>
       entry.options.key !== undefined && served.has(entry.options.key) ? [entry.options.key] : [])
     const previous = this.store.getSnapshot()
-    // Every settings-document commit re-reads, and most of them change nothing
-    // this section shows. An observable source must keep its snapshot
-    // reference until the fact moves, or each unrelated save re-renders the
-    // whole card list (packages/client/AGENTS.md reactive rule 5).
-    if (previous.loaded === this.loaded
+    // Every settings-document commit refreshes the mirror, and most commits
+    // change nothing this section shows. An observable source must keep its
+    // snapshot reference until the fact moves, or each unrelated save
+    // re-renders the whole card list (packages/client/AGENTS.md reactive rule 5).
+    if (previous.loaded === loaded
       && previous.namespaces.length === namespaces.length
       && previous.namespaces.every((ns, index) => ns === namespaces[index])) return
-    this.store.set({ loaded: this.loaded, namespaces })
+    this.store.set({ loaded, namespaces })
   }
 }

packages/client/ui-settings-plugins/tests/apply.client.spec.ts

@@ -6,8 +6,7 @@ import { resolveSlotLabel } from '@deepseek-ai/dsh-client-ui-slots'
 import { SlotRegistry } from '@deepseek-ai/dsh-client-runtime/client'
 import { LocaleRuntime } from '@deepseek-ai/dsh-client-locale/client'
 import { TestRemote, usePinnedBrowserLanguages } from '@deepseek-ai/dsh-client-test-runtime'
-import { SettingsSchemaService } from '@deepseek-ai/dsh-client-ui-settings/src/client/schema.ts'
-import { SettingsScopeBinder } from '@deepseek-ai/dsh-client-ui-settings/src/client/settings-scope.ts'
+import { apply as settingsApply, inject as settingsInject } from '@deepseek-ai/dsh-client-ui-settings/client'
 import { apply, inject } from '@deepseek-ai/dsh-client-ui-settings-plugins/client'
 import type {
   ConfigurablePluginsTabFace, PluginsSettingsSectionInjected,
@@ -53,7 +52,7 @@ async function bench(served?: string[]) {
       credentials: { describe: describeCredentials },
     },
   } as never)
-  await ctx.plugin(SettingsScopeBinder, new SettingsSchemaService(ctx)).await()
+  await ctx.plugin({ inject: [...settingsInject], apply: settingsApply }).await()
   return { ctx, slots: ctx.get('slots') as SlotRegistry, describeCredentials, describeSettings }
 }
 

packages/client/ui-settings-plugins/tests/stores.client.spec.ts

@@ -8,6 +8,9 @@ import { stubSettingsScope, type StubSettingsScope } from '@deepseek-ai/dsh-clie
 import { CardForm, numberField, textField } from '../src/client/card-form.ts'
 import { AgentLoopCardController, type AgentLoopSettings } from '../src/client/agent-loop-card-controller.ts'
 import { BashCardController, type BashSettings } from '../src/client/bash-card-controller.ts'
+import {
+  SettingsDescribeMirror, type SettingsMirrorSnapshot,
+} from '@deepseek-ai/dsh-client-ui-settings/src/client/settings-mirror.ts'
 import { ConfigurablePluginsTabController } from '../src/client/tab-store.ts'
 import { WebSearchCardController, type WebSearchSettings } from '../src/client/web-search-card-controller.ts'
 
@@ -555,7 +558,7 @@ describe('ConfigurablePluginsTabController', () => {
         },
       },
     }))
-    return { api: { settings: { describe } } as never, describe }
+    return { mirror: new SettingsDescribeMirror({ settings: { describe } } as never), describe }
   }
 
   /** Slot ledger stand-in: one stored entry per registered card key. */
@@ -565,9 +568,9 @@ describe('ConfigurablePluginsTabController', () => {
 
   it('dispatches the served namespaces a card claims, in card registration order', async () => {
     const settings = settingsApi(['bash', 'ui-theme', 'agent-loop'])
-    const controller = new ConfigurablePluginsTabController(settings.api, () => ledger('agent-loop', 'bash'))
+    const controller = new ConfigurablePluginsTabController(settings.mirror, () => ledger('agent-loop', 'bash'))
 
-    await controller.load()
+    await settings.mirror.ensure()
 
     // ui-theme is served but claimed by no card here — another surface owns
     // it. The order is the cards', not the Host's: plugin activation can
@@ -578,9 +581,9 @@ describe('ConfigurablePluginsTabController', () => {
 
   it('never dispatches a card whose namespace this deployment does not serve', async () => {
     const settings = settingsApi(['bash'])
-    const controller = new ConfigurablePluginsTabController(settings.api, () => ledger('bash', 'web-search-deepseek'))
+    const controller = new ConfigurablePluginsTabController(settings.mirror, () => ledger('bash', 'web-search-deepseek'))
 
-    await controller.load()
+    await settings.mirror.ensure()
 
     expect(controller.inject().hooks.configurablePlugins.getSnapshot().namespaces).toEqual(['bash'])
   })
@@ -588,8 +591,8 @@ describe('ConfigurablePluginsTabController', () => {
   it('takes a card registered after the read without asking the Host again', async () => {
     const settings = settingsApi(['bash'])
     let entries = ledger()
-    const controller = new ConfigurablePluginsTabController(settings.api, () => entries)
-    await controller.load()
+    const controller = new ConfigurablePluginsTabController(settings.mirror, () => entries)
+    await settings.mirror.ensure()
     expect(controller.inject().hooks.configurablePlugins.getSnapshot().namespaces).toEqual([])
 
     entries = ledger('bash')
@@ -599,34 +602,33 @@ describe('ConfigurablePluginsTabController', () => {
     expect(settings.describe).toHaveBeenCalledOnce()
   })
 
-  it('keeps the namespaces it knew when a read fails', async () => {
+  it('keeps the namespaces it knew when a refresh fails', async () => {
     const settings = settingsApi(['bash'])
-    const controller = new ConfigurablePluginsTabController(settings.api, () => ledger('bash'))
-    await controller.load()
+    const controller = new ConfigurablePluginsTabController(settings.mirror, () => ledger('bash'))
+    await settings.mirror.ensure()
     settings.describe.mockRejectedValueOnce(new Error('offline'))
 
-    await controller.load()
+    await settings.mirror.load()
 
     expect(controller.inject().hooks.configurablePlugins.getSnapshot().namespaces).toEqual(['bash'])
   })
 
-  it('publishes nothing once disposed, and never claims it was answered', async () => {
+  it('stops following the mirror once disposed, and never claims it was answered', async () => {
     const settings = settingsApi(['bash'])
-    const controller = new ConfigurablePluginsTabController(settings.api, () => ledger('bash'))
+    const controller = new ConfigurablePluginsTabController(settings.mirror, () => ledger('bash'))
 
     controller.dispose()
-    await controller.load()
+    await settings.mirror.load()
 
     expect(controller.inject().hooks.configurablePlugins.getSnapshot())
       .toEqual({ loaded: false, namespaces: [] })
-    expect(settings.describe).not.toHaveBeenCalled()
   })
 
   it('ignores a slot-ledger change that arrives after disposal', async () => {
     const settings = settingsApi(['bash'])
     let entries = ledger()
-    const controller = new ConfigurablePluginsTabController(settings.api, () => entries)
-    await controller.load()
+    const controller = new ConfigurablePluginsTabController(settings.mirror, () => entries)
+    await settings.mirror.ensure()
 
     controller.dispose()
     entries = ledger('bash')
@@ -635,33 +637,49 @@ describe('ConfigurablePluginsTabController', () => {
     expect(controller.inject().hooks.configurablePlugins.getSnapshot().namespaces).toEqual([])
   })
 
-  it('drops a read a newer one superseded', async () => {
-    // The section re-reads on every settings-document invalidation, so a slow
-    // first answer must not overwrite the newer one that already landed.
-    const settings = settingsApi(['bash'])
-    const controller = new ConfigurablePluginsTabController(settings.api, () => ledger('bash', 'agent-loop'))
-    const slow = Promise.withResolvers<unknown>()
-    settings.describe.mockReturnValueOnce(slow.promise as never)
-    const stale = controller.load()
+  it('ignores a mirror notification already queued when disposal starts', () => {
+    let notify = (): void => {}
+    let snapshot: SettingsMirrorSnapshot = {
+      status: 'ready' as const,
+      view: { writable: true, hasDocument: true, namespaces: [] },
+      error: null,
+    }
+    const describeFace = {
+      getSnapshot: () => snapshot,
+      subscribe: (listener: () => void) => {
+        notify = listener
+        return () => {}
+      },
+      ensure: () => Promise.resolve(),
+      acceptView: vi.fn(),
+    } as never
+    const controller = new ConfigurablePluginsTabController(describeFace, () => ledger('bash'))
+    expect(controller.inject().hooks.configurablePlugins.getSnapshot())
+      .toEqual({ loaded: true, namespaces: [] })
 
-    await controller.load()
-    expect(controller.inject().hooks.configurablePlugins.getSnapshot().namespaces).toEqual(['bash'])
-    slow.resolve({
-      rpcId: 's-0',
-      result: { ok: true, value: { writable: true, hasDocument: true, namespaces: [
-        { ns: 'agent-loop', schema: {}, value: {}, applies: 'live', secrets: [], revision: 0 },
-      ] } },
-    })
-    await stale
+    controller.dispose()
+    snapshot = {
+      status: 'ready',
+      view: {
+        writable: true,
+        hasDocument: true,
+        namespaces: [{
+          ns: 'bash', schema: {}, value: {}, applies: 'live', secrets: [], revision: 1,
+        }],
+      },
+      error: null,
+    }
+    notify()
 
-    expect(controller.inject().hooks.configurablePlugins.getSnapshot().namespaces).toEqual(['bash'])
+    expect(controller.inject().hooks.configurablePlugins.getSnapshot())
+      .toEqual({ loaded: true, namespaces: [] })
   })
 
   it('reports the Host answered even when it serves nothing this tab shows', async () => {
     const settings = settingsApi(['ui-theme'])
-    const controller = new ConfigurablePluginsTabController(settings.api, () => ledger('bash'))
+    const controller = new ConfigurablePluginsTabController(settings.mirror, () => ledger('bash'))
 
-    await controller.load()
+    await settings.mirror.ensure()
 
     expect(controller.inject().hooks.configurablePlugins.getSnapshot())
       .toEqual({ loaded: true, namespaces: [] })

packages/client/ui-settings/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/client/ui-settings/README.md
-README.md: 723e6f7120c256406daedd2085eef055b72263fe
-README.zh.md: 42f6f6e09ee520542ddc74344be5619adf5adf02
+README.md: 990469573309b3a92b5eeb8bc41d89b226dbd0d4
+README.zh.md: a0ce9d5cf6d4633cec9fbf466083c7a11a947e8e

packages/client/ui-settings/README.md

@@ -4,8 +4,7 @@ English | [中文](README.zh.md)
 
 The settings domain's base layer, with no presentation of its own. It provides `ctx.settingsScope`, the Host transport every preference row binds its durable namespace section through; `ctx.settingsSchema`, the synchronous schema-rehydration, validation, and immutable path-editing service used by settings plugins; and the settings slot types registrants fill: `settings.trigger` / `settings.header` / `settings.close` (chrome content), `settings.action` (ordered content-header actions), `settings.section` (one page per feature), `settings.plugins.tab` (feature-owned pages inside the Plugins section), and `settings.onboarding` (ordered feature-owned pages). It depends on no `ui-*` presentation package, so any feature that owns a preference can reach it; the settings SHELL — the `sidebar.settings` occupant, its navigation, and the chrome — lives in ui-settings-general, because a shell dependency on ui-sidebar would close a reference graph cycle through ui-layout and ui-theme. The shell's own contract types live beside the shell for the same reason.
 
-The plugin injects nothing and waits for nothing: schema operations are synchronous, while `ctx.settingsScope.bind(spec)` resolves the wire face through the caller's context at call time. The bound scope's disposer belongs to the calling fiber, and the caller injects `connection` for the transport and `remote` for invalidation. Listeners exist before the first background read starts, so a row's activation never blocks on the settings transport. A bound scope reloads on the forwarded `settings/document-updated` event for its own namespace and on `connection/reset`. Writes carry one field path and the last known namespace revision as `expectedRevision`; a rejected or failed write re-reads unless a newer write already superseded it, and a stale read never publishes over a newer one. The snapshot carries the resolved section, composition `base`, raw `user`, revision, writability, and host/memory mode. A field is overridden when it is present in `user`, even when its value equals `base`; `unset` clears that override. Without a `decode` in the spec, a section that is not a plain object, fails its rehydrated schema, or carries a schema envelope this client cannot rehydrate publishes no value at all, so a row renders its own absent state instead of a half-decoded one.
-
+The plugin injects `connection` and `remote` and owns the one `settings.describe` reader in the browser: a shared mirror holding the whole answer, refreshed on every forwarded `settings/document-updated` event and on `connection/reset` (the first connection included — that read closes the window where a commit lands between the eager read and the SSE subscription). Schema operations are synchronous and live on the `settingsSchema` service. `ctx.settingsScope.bind(spec)` returns a per-namespace scope DERIVED from the mirror on the CALLER's context — the scope's disposer belongs to the calling fiber, binding adds no wire read, a row's activation never blocks on the settings transport, and every derived surface shows the same document revision at any moment. Cross-namespace surfaces (schema introspection, the served-namespace directory, `hasDocument`) read the same mirror through `ctx.settingsScope.describe()`, a read/fold face (`getSnapshot`/`subscribe`/`ensure`, plus `acceptView` folding a write answer in). The scope snapshot carries the resolved section, composition `base`, raw `user`, revision, writability, and host/memory mode; a field is overridden when it is present in `user`, even when its value equals `base`, and `unset` clears that override. Writes stay per-scope: one field path fenced by the namespace revision as `expectedRevision`; a committed write folds its answer back into the mirror with no re-read, a rejected or failed latest write triggers one mirror recovery read, and a superseded one leaves recovery to its successor. Without a `decode` in the spec, a section that is not a plain object, fails its rehydrated schema, or carries a schema envelope this client cannot rehydrate publishes no value at all, so a row renders its own absent state instead of a half-decoded one. The cold-boot read count is pinned by `apps/web/tests/startup-rpc-budget.e2e.ts`; a new direct `settings.describe` caller in client code is a regression against it.
 ## Model Experience
 
 None, as the settings domain base serves browser preference storage and slot declarations; nothing here reaches a model request.

packages/client/ui-settings/README.zh.md

@@ -4,8 +4,7 @@
 
 设置领域的底座，本身不含任何呈现内容。它提供 `ctx.settingsScope`——每个偏好设置行绑定自己那份持久化命名空间分区所用的宿主传输层；`ctx.settingsSchema`——设置插件使用的同步 schema 重建、校验与不可变路径编辑服务；并声明由注册方填充的设置 slot 类型：`settings.trigger`／`settings.header`／`settings.close`（界面框架内容）、`settings.action`（内容标题栏中的有序操作）、`settings.section`（每项功能一页）、`settings.plugins.tab`（“插件”分区内由各功能持有的页面）和 `settings.onboarding`（由各功能持有的有序页面）。它不依赖任何 `ui-*` 呈现包，因此任何持有偏好设置的功能都能够到它；设置**外壳**——`sidebar.settings` 占位方、它的导航与界面框架——位于 ui-settings-general，因为外壳一旦依赖 ui-sidebar，就会经 ui-layout 与 ui-theme 闭合出一条引用图环路。外壳自身的契约类型出于同一原因与外壳放在一起。
 
-该插件不注入任何服务、也不等待任何服务：schema 操作为同步调用，而 `ctx.settingsScope.bind(spec)` 在调用时经调用方的 context 解析线路面。绑定所得 scope 的 disposer 归调用方 fiber 所有，而由调用方注入 `connection` 取得传输层、注入 `remote` 取得失效通知。监听器在首次后台读取启动之前就已存在，因此某一行的激活绝不会阻塞在设置传输层上。已绑定的 scope 会在收到属于自己命名空间的转发 `settings/document-updated` 事件时、以及在 `connection/reset` 时重新读取。写入携带单一字段路径以及最近已知的命名空间 revision 作为 `expectedRevision`；被拒绝或失败的写入会重新读取，除非已有更新的写入取代了它，而陈旧的读取绝不会覆盖更新的发布结果。快照携带解析后的分区、组合 `base`、原始 `user`、revision、可写性以及 host／内存模式。字段只要出现在 `user` 中即视为覆盖，即使其值与 `base` 相等；`unset` 会清除该覆盖。若 spec 未提供 `decode`，则分区不是普通对象、未通过其重建后的 schema 校验、或携带本客户端无法重建的 schema 信封时，一律不发布任何值，于是行渲染自己的缺失状态，而不是一份半解码的值。
-
+该插件注入 `connection` 与 `remote`，并持有浏览器中唯一的 `settings.describe` 读取方：一面持有完整应答的共享镜像，在每次转发的 `settings/document-updated` 事件与 `connection/reset` 时刷新（首次连接也包含在内——这次读取关闭了「提交落在急切读取与 SSE 订阅之间、其失效通知丢失」的窗口）。schema 操作为同步调用，由 `settingsSchema` 服务承载。`ctx.settingsScope.bind(spec)` 在**调用方**的 context 上返回一个由镜像**派生**的按命名空间 scope——scope 的 disposer 归调用方 fiber 所有，绑定不新增任何线路读取，某一行的激活绝不会阻塞在设置传输层上，且任一时刻每个派生面看到的都是同一份文档 revision。跨命名空间的表面（schema 内省、已服务命名空间目录、`hasDocument`）通过 `ctx.settingsScope.describe()` 读同一面镜像，这是一个读取／折叠面（`getSnapshot`／`subscribe`／`ensure`，另有把写应答折入的 `acceptView`）。scope 快照携带解析后的分区、组合 `base`、原始 `user`、revision、可写性以及 host／内存模式；字段只要出现在 `user` 中即视为覆盖，即使其值与 `base` 相等，`unset` 会清除该覆盖。写入仍归各 scope：单一字段路径，以命名空间 revision 作为 `expectedRevision` 围栏；提交成功的写入将应答折回镜像、不再重读，被拒绝或失败的最新写入触发一次镜像恢复读取，被取代的写入则把恢复留给后继者。若 spec 未提供 `decode`，则分区不是普通对象、未通过其重建后的 schema 校验、或携带本客户端无法重建的 schema 信封时，一律不发布任何值，于是行渲染自己的缺失状态，而不是一份半解码的值。冷启动读取次数由 `apps/web/tests/startup-rpc-budget.e2e.ts` 钉住；客户端代码中新增直连 `settings.describe` 调用即是对它的回归。
 ## 模型体验
 
 无。设置领域底座为浏览器提供偏好设置存储与 slot 声明；这里没有任何内容进入模型请求。

packages/client/ui-settings/src/client/index.ts

@@ -1,16 +1,26 @@
 /**
  * Settings domain base plugin, browser half. Provides `ctx.settingsScope`, the
- * settings-namespace Host transport every preference row binds its durable
- * section through, and owns the canonical slot-type contract for the settings
- * surface. It depends on no `ui-*` presentation package, so any feature that
- * owns a preference can reach it: the settings SHELL — the `sidebar.settings`
- * occupant, its navigation, and the chrome — lives in ui-settings-general,
- * because a shell dependency on ui-sidebar would close a reference cycle
- * through ui-layout and ui-theme. Export discipline: packages/client/AGENTS.md.
+ * settings-namespace scope service every preference row binds its durable
+ * section through, and owns the one `settings.describe` reader in the browser:
+ * the describe mirror, whose invalidation subscriptions
+ * (`settings/document-updated`, `connection/reset`) live here so every derived
+ * surface refreshes from a single wire read. It depends on no `ui-*`
+ * presentation package, so any feature that owns a preference can reach it:
+ * the settings SHELL — the `sidebar.settings` occupant, its navigation, and
+ * the chrome — lives in ui-settings-general, because a shell dependency on
+ * ui-sidebar would close a reference cycle through ui-layout and ui-theme.
+ * Export discipline: packages/client/AGENTS.md.
  */
 import type { ClientContext } from '@deepseek-ai/dsh-client-runtime/client'
+import type { ConnectionHandle } from '@deepseek-ai/dsh-api-remotes/client'
+// Type-only pair supplying `$on` and its key face without dragging a build
+// artifact into the Host graph (rationale beside the same pair in
+// settings-scope.ts).
+import type {} from '@deepseek-ai/dsh-api-remotes/types'
+import type {} from '@deepseek-ai/dsh-settings/types'
 import { SettingsSchemaService } from './schema.ts'
 import { SettingsScopeBinder } from './settings-scope.ts'
+import { SettingsDescribeMirror } from './settings-mirror.ts'
 
 export type {
   SettingsGeneralItemOwnerProps, SettingsHeaderOwnerProps, SettingsOnboardingOwnerProps,
@@ -19,15 +29,18 @@ export type {
 export type { SettingsScopeController, SettingsScopeBinder } from './settings-scope.ts'
 export type { SettingsSchemaService } from './schema.ts'
 export type { SchemaNode } from './schema.ts'
+export type { SettingsDescribeFace, SettingsDescribeView, SettingsMirrorSnapshot } from './settings-mirror.ts'
 
 /**
- * Required services: none. The transport is resolved per caller through
- * `this.ctx` at `bind` time, so this plugin waits for nothing.
+ * Required services: the wire handle for the mirror's reads and the forwarded
+ * settings invalidation the mirror refreshes on.
  */
-export const inject = []
+export const inject = ['connection', 'remote']
 
 /**
- * Provide the settings-namespace scope service.
+ * Provide the settings-namespace scope service over one shared describe
+ * mirror, and keep that mirror fresh on the two signals that can move the
+ * settings document: a document commit and a (re)connect.
  *
  * Constructing the service in this plugin's fiber keeps its traced methods
  * bound to each consuming plugin's context.
@@ -35,5 +48,22 @@ export const inject = []
  */
 export function apply(ctx: ClientContext): void {
   const schema = new SettingsSchemaService(ctx)
-  new SettingsScopeBinder(ctx, schema)
+  const connection = ctx.get('connection') as ConnectionHandle
+  const mirror = new SettingsDescribeMirror(
+    connection.api,
+    connection.isLoopback ? 'host' : 'memory',
+  )
+  ctx.effect(() => {
+    const disposers = [
+      (ctx.get('remote') as ClientContext['remote']).$on('settings/document-updated', () => { void mirror.load() }),
+      ctx.on('connection/reset', () => { void mirror.load() }),
+    ]
+    // The first connection also emits connection/reset, so startup normally
+    // costs two reads (budgeted in startup-rpc-budget.e2e.ts). The in-flight
+    // fold does not merge them into one; it guarantees at most one pending
+    // read at a time and that no invalidation arriving mid-read is lost.
+    void mirror.ensure()
+    return () => { for (const dispose of disposers) dispose() }
+  }, 'ui-settings: describe mirror invalidations')
+  new SettingsScopeBinder(ctx, { mirror, schema })
 }

packages/client/ui-settings/src/client/settings-mirror.ts

@@ -0,0 +1,213 @@
+/**
+ * Client mirror of the Host settings document: the one `settings.describe`
+ * reader in the browser. Every settings consumer derives from this store —
+ * per-namespace scopes through `SettingsScopeBinder.bind`, cross-namespace
+ * surfaces through the binder's shared describe face — so startup cost and
+ * freshness are properties of this class, not of how many features own a
+ * preference. The Host stays the fact source: the mirror re-reads on the
+ * invalidations its owning plugin subscribes to and folds write answers in
+ * through {@link SettingsDescribeMirror.acceptView}.
+ */
+
+import type { IApiClient, SettingsNamespaceView } from '@deepseek-ai/dsh-api-remotes/client'
+import { createSnapshotStore, type SnapshotStore } from '@deepseek-ai/dsh-client-runtime/client'
+
+type SettingsFace = Pick<IApiClient, 'settings'>
+
+/** The full `settings.describe` answer the mirror serves. */
+export interface SettingsDescribeView {
+  /** Every namespace a live Host plugin registered, as the Host reported it. */
+  namespaces: readonly SettingsNamespaceView[]
+  /** Whether the settings provider accepts writes. */
+  writable: boolean
+  /** Whether a native settings document exists for the Host to open. */
+  hasDocument: boolean
+}
+
+/** Mirror state every derived settings surface renders from. */
+export interface SettingsMirrorSnapshot {
+  /**
+   * `unavailable` is the terminal non-loopback state; `ready` persists across
+   * later failed refreshes (the held view keeps serving); `idle` means no
+   * answer is held and no read is running, so `ensure` will start one.
+   */
+  status: 'idle' | 'loading' | 'ready' | 'unavailable'
+  /** The last good answer; undefined until the first success. */
+  view: SettingsDescribeView | undefined
+  /** The latest refresh failure message, cleared by the next success. */
+  error: string | null
+}
+
+/**
+ * The mirror as cross-namespace surfaces consume it: current answer,
+ * subscription, first-use read, and the write-answer fold. `load` stays off
+ * this face — invalidation refreshes belong to the mirror's owning plugin.
+ */
+export interface SettingsDescribeFace {
+  /** @returns the current sync snapshot (stable reference until the next change). */
+  getSnapshot(): SettingsMirrorSnapshot
+  /**
+   * Observe snapshot replacements.
+   * @param listener - invoked after each snapshot change.
+   * @returns the disposer removing this listener.
+   */
+  subscribe(listener: () => void): () => void
+  /**
+   * Resolve once an answer is held (or the mirror is terminally unavailable),
+   * reading only from `idle`.
+   * @returns settlement of the current or newly started read, if any.
+   */
+  ensure(): Promise<void>
+  /**
+   * Fold one write answer's namespace view into the held view without a wire
+   * read, invalidating any older read still in flight.
+   * @param view - the namespace view a settings write answered with.
+   */
+  acceptView(view: SettingsNamespaceView): void
+}
+
+/**
+ * Serializes every Host `settings.describe` read behind one snapshot store.
+ * Concurrent {@link load} calls fold into the in-flight read plus one rerun,
+ * so an invalidation arriving mid-read is never lost and never duplicated.
+ */
+export class SettingsDescribeMirror implements SettingsDescribeFace {
+  private readonly store: SnapshotStore<SettingsMirrorSnapshot>
+  private inFlight: Promise<void> | undefined
+  private rerun = false
+  private generation = 0
+
+  /**
+   * @param api - settings wire face.
+   * @param persistence - remote browsers stay process-local because settings RPCs are loopback-only.
+   */
+  constructor(
+    private readonly api: SettingsFace,
+    private readonly persistence: 'host' | 'memory' = 'host',
+  ) {
+    this.store = createSnapshotStore<SettingsMirrorSnapshot>({
+      status: persistence === 'host' ? 'idle' : 'unavailable',
+      view: undefined,
+      error: null,
+    })
+  }
+
+  /** @returns the current sync snapshot (stable reference until the next change). */
+  getSnapshot(): SettingsMirrorSnapshot {
+    return this.store.getSnapshot()
+  }
+
+  /**
+   * Observe snapshot replacements.
+   * @param listener - invoked after each snapshot change.
+   * @returns the disposer removing this listener.
+   */
+  subscribe(listener: () => void): () => void {
+    return this.store.subscribe(listener)
+  }
+
+  /**
+   * Refresh from the Host. A call during an in-flight read marks one rerun
+   * after it settles instead of racing a second wire read.
+   * @returns settlement after this call's freshness is reflected.
+   */
+  load(): Promise<void> {
+    if (this.persistence === 'memory') return Promise.resolve()
+    if (this.inFlight !== undefined) {
+      this.rerun = true
+      return this.inFlight
+    }
+    // Own the slot before the loading publication can synchronously reenter load().
+    const run = Promise.resolve().then(() => this.run())
+    this.inFlight = run
+    return run
+  }
+
+  /**
+   * Resolve once an answer is held (or the mirror is terminally unavailable),
+   * reading only from `idle`. The cheap idempotent entry for surfaces that
+   * render on first use.
+   * @returns settlement of the current or newly started read, if any.
+   */
+  ensure(): Promise<void> {
+    if (this.persistence === 'memory') return Promise.resolve()
+    if (this.inFlight !== undefined) return this.inFlight
+    if (this.getSnapshot().status === 'idle') return this.load()
+    return Promise.resolve()
+  }
+
+  /**
+   * Fold one write answer's namespace view into the held view without a wire
+   * read, and invalidate any read still in flight. With no held document, the
+   * answer is not published as a partial document; an in-flight read reruns so
+   * it cannot publish a document fetched before the write committed.
+   * @param view - the namespace view a settings write answered with.
+   */
+  acceptView(view: SettingsNamespaceView): void {
+    const before = this.store.getSnapshot()
+    this.generation += 1
+    if (this.inFlight !== undefined) this.rerun = true
+    if (before.view === undefined) return
+    const namespaces = before.view.namespaces.some(row => row.ns === view.ns)
+      ? before.view.namespaces.map(row => row.ns === view.ns ? view : row)
+      : [...before.view.namespaces, view]
+    this.store.set({ ...before, view: { ...before.view, namespaces } })
+  }
+
+  /**
+   * Convenience row lookup on the held view.
+   * @param ns - namespace identity.
+   * @returns the namespace view, or undefined while unanswered or unregistered.
+   */
+  namespace(ns: string): SettingsNamespaceView | undefined {
+    return this.store.getSnapshot().view?.namespaces.find(row => row.ns === ns)
+  }
+
+  private async run(): Promise<void> {
+    // The in-flight slot must clear in the same synchronous segment that
+    // observes `rerun` false (and on abrupt exit): a `.finally()` on the
+    // returned promise runs one microtask later, and a `load()` landing in
+    // that gap would mark a rerun nobody reads, losing the read.
+    try {
+      do {
+        const before = this.store.getSnapshot()
+        if (before.status === 'idle') this.store.set({ ...before, status: 'loading' })
+        // Cleared immediately before the wire read goes out: a load() marked
+        // earlier (including one reentering from the loading publish above)
+        // is covered by this very read, while one landing after needs the
+        // rerun.
+        this.rerun = false
+        const generation = ++this.generation
+        let outcome: { view: SettingsDescribeView } | { failure: string }
+        try {
+          const response = await this.api.settings.describe({})
+          outcome = response.result.ok
+            ? { view: response.result.value }
+            : { failure: response.result.error.message }
+        } catch (error) {
+          outcome = { failure: error instanceof Error ? error.message : String(error) }
+        }
+        // A write answer invalidates a document read before that write committed.
+        if (generation !== this.generation) continue
+        if ('view' in outcome) {
+          this.store.set({ status: 'ready', view: outcome.view, error: null })
+        } else {
+          const held = this.store.getSnapshot()
+          // No answer yet: fall back to idle so `ensure` retries; with one, the
+          // held view keeps serving and only the error field reports the miss.
+          this.store.set({
+            status: held.view === undefined ? 'idle' : 'ready',
+            view: held.view,
+            error: outcome.failure,
+          })
+        }
+      } while (this.shouldRerun())
+    } finally {
+      this.inFlight = undefined
+    }
+  }
+
+  private shouldRerun(): boolean {
+    return this.rerun
+  }
+}

packages/client/ui-settings/src/client/settings-scope.ts

@@ -1,8 +1,11 @@
 /**
  * Host transport for the settings-namespace scope contract. The contract types
  * live in `dsh-client-runtime` (the common dependency of every feature that
- * owns a preference); this file owns the wire behavior and the invalidation
- * subscription, both of which are Settings-surface concerns.
+ * owns a preference); this file owns the per-namespace derivation over the
+ * shared {@link SettingsDescribeMirror} and the serialized write path, both of
+ * which are Settings-surface concerns. Reads never touch the wire here: the
+ * mirror is the one `settings.describe` reader, and every scope is a selector
+ * over its snapshot.
  */
 
 import { Service } from '@deepseek-ai/cordis'
@@ -21,8 +24,8 @@ import {
 // Client half declares `ctx.remote` with no generated import, and the
 // allowlist's `types` subpath is a pure-type source file, so the pair supplies
 // `$on` and its key face without dragging a build artifact in. The runtime
-// `remote` injection belongs to whoever calls `ctx.settingsScope.bind(spec)`: the
-// subscription is registered on the caller's own context.
+// `remote` injection belongs to the providing plugin's apply, which registers
+// the mirror's invalidation subscriptions.
 import type {} from '@deepseek-ai/dsh-api-remotes/client'
 import type {} from '@deepseek-ai/dsh-api-remotes/types'
 // The forwarded event's own declaration: `$on`'s key face is
@@ -31,30 +34,40 @@ import type {} from '@deepseek-ai/dsh-api-remotes/types'
 // cordis `Events` entry (and with it the branded `SettingsNamespace`).
 import type {} from '@deepseek-ai/dsh-settings/types'
 import type { SettingsSchemaService } from './schema.ts'
+import { SettingsDescribeMirror, type SettingsDescribeFace } from './settings-mirror.ts'
+
 type SettingsFace = Pick<IApiClient, 'settings'>
 
 /**
- * Serializes one namespace's Host reads and writes behind a snapshot store.
- * Reads never block plugin activation; writes carry the latest known
- * namespace revision and teardown waits for the operation already crossing
- * the wire.
+ * One namespace's derived view over the shared describe mirror, plus that
+ * namespace's serialized Host writes. Writes carry the latest known namespace
+ * revision, fold their answers back into the mirror, and teardown waits for
+ * the operation already crossing the wire.
  */
 export class SettingsScopeController<T> implements SettingsScope<T> {
   private readonly store: SnapshotStore<SettingsScopeSnapshot<T>>
   private tail: Promise<void> = Promise.resolve()
-  private readGeneration = 0
   private writeGeneration = 0
   private disposed = false
+  private readonly unsubscribe: (() => void) | undefined
+  /**
+   * Revision answered by a superseded write still ahead of the mirror: the
+   * mirror only folds the LATEST settlement in, so a queued successor takes
+   * its fence from here first.
+   */
+  private pendingRevision: number | undefined
 
   /**
-   * @param api - settings wire face.
+   * @param api - settings wire face (writes only; reads ride the mirror).
    * @param spec - namespace identity and optional narrowing decoder.
+   * @param mirror - the shared describe mirror this scope derives from.
    * @param persistence - remote browsers remain process-local because settings RPCs are loopback-only.
    * @param schema - settings-owned schema operations.
    */
   constructor(
     private readonly api: SettingsFace,
     private readonly spec: SettingsScopeSpec<T>,
+    private readonly mirror: SettingsDescribeMirror,
     private readonly persistence: 'host' | 'memory',
     private readonly schema: SettingsSchemaService,
   ) {
@@ -67,6 +80,10 @@ export class SettingsScopeController<T> implements SettingsScope<T> {
       writable: false,
       mode: persistence,
     })
+    if (persistence === 'host') {
+      this.unsubscribe = mirror.subscribe(() => { this.derive() })
+      this.derive()
+    }
   }
 
   /** @returns the current sync snapshot (stable reference until the next change). */
@@ -83,15 +100,6 @@ export class SettingsScopeController<T> implements SettingsScope<T> {
     return this.store.subscribe(listener)
   }
 
-  /**
-   * Queue a Host refresh; a newer read or user write suppresses stale publication.
-   * @returns settlement after the queued read completes or is skipped.
-   */
-  load(): Promise<void> {
-    const generation = ++this.readGeneration
-    return this.enqueue(() => this.read(generation))
-  }
-
   /**
    * Queue one field write; see {@link SettingsScope.set} for the ordering,
    * revision, and recovery contract.
@@ -114,10 +122,9 @@ export class SettingsScopeController<T> implements SettingsScope<T> {
   }
 
   private write(op: SettingsPathOpView): Promise<void> {
-    this.readGeneration += 1
     const generation = ++this.writeGeneration
     return this.enqueue(async () => {
-      const revision = this.getSnapshot().revision
+      const revision = this.pendingRevision ?? this.getSnapshot().revision
       let response: Awaited<ReturnType<SettingsFace['settings']['mutate']>>
       try {
         response = await this.api.settings.mutate({
@@ -126,25 +133,39 @@ export class SettingsScopeController<T> implements SettingsScope<T> {
           ...(revision === undefined ? {} : { expectedRevision: revision }),
         })
       } catch (_settingsWriteFailure) {
-        if (!this.disposed && generation === this.writeGeneration) await this.read(++this.readGeneration)
+        await this.recover(generation)
         return
       }
       if (!response.result.ok) {
-        if (!this.disposed && generation === this.writeGeneration) await this.read(++this.readGeneration)
+        await this.recover(generation)
         return
       }
-      this.accept(response.result.value, generation === this.writeGeneration)
+      if (this.disposed) return
+      if (generation === this.writeGeneration) {
+        this.pendingRevision = undefined
+        this.mirror.acceptView(response.result.value)
+      } else {
+        this.pendingRevision = response.result.value.revision
+      }
     })
   }
 
+  /** Reload Host state for the latest failed write; superseded failures leave recovery to it. */
+  private async recover(generation: number): Promise<void> {
+    if (this.disposed || generation !== this.writeGeneration) return
+    this.pendingRevision = undefined
+    await this.mirror.load()
+  }
+
   /**
-   * Stop queued operations and wait for the current wire call to settle.
+   * Stop queued operations, stop deriving, and wait for the current wire call
+   * to settle.
    * @returns settlement after the controller reaches quiescence.
    */
   async dispose(): Promise<void> {
     this.disposed = true
-    this.readGeneration += 1
     this.writeGeneration += 1
+    this.unsubscribe?.()
     await this.tail
   }
 
@@ -160,36 +181,25 @@ export class SettingsScopeController<T> implements SettingsScope<T> {
     return task
   }
 
-  private async read(generation: number): Promise<void> {
-    let response: Awaited<ReturnType<SettingsFace['settings']['describe']>>
-    try {
-      response = await this.api.settings.describe({})
-    } catch (_settingsReadFailure) {
-      return
-    }
-    if (!response.result.ok || this.disposed) return
-    const { namespaces, writable } = response.result.value
-    const view = namespaces.find(candidate => candidate.ns === this.spec.namespace)
-    const publish = generation === this.readGeneration
+  private derive(): void {
+    if (this.disposed) return
+    const mirrored = this.mirror.getSnapshot()
+    if (mirrored.view === undefined) return
+    const { writable } = mirrored.view
+    const view = mirrored.view.namespaces.find(candidate => candidate.ns === this.spec.namespace)
     if (view === undefined) {
-      if (publish) {
-        this.store.update((draft) => {
-          draft.status = 'unavailable'
-          draft.writable = writable
-        })
-      }
+      this.store.update((draft) => {
+        draft.status = 'unavailable'
+        draft.writable = writable
+      })
       return
     }
-    this.accept(view, publish, writable)
-  }
-
-  private accept(view: SettingsNamespaceView, publish: boolean, writable?: boolean): void {
-    const decoded = publish ? this.decode(view) : undefined
+    const decoded = this.decode(view)
     this.store.update((draft) => {
       draft.revision = view.revision
       draft.base = view.base
       draft.user = view.user
-      if (writable !== undefined) draft.writable = writable
+      draft.writable = writable
       if (decoded === undefined) return
       draft.status = 'ready'
       draft.value = decoded
@@ -227,20 +237,38 @@ declare module '@deepseek-ai/cordis' {
  * (`packages/client/tsdown.client.ts`).
  */
 export class SettingsScopeBinder extends Service {
+  private readonly mirror: SettingsDescribeMirror
+  private readonly schema: SettingsSchemaService
+
   /**
    * @param ctx - the providing plugin's context.
+   * @param config - the shared describe mirror every bound scope derives from,
+   * plus the settings-owned schema operations.
    */
-  constructor(ctx: Context, private readonly schema: SettingsSchemaService) {
+  constructor(ctx: Context, config: { mirror: SettingsDescribeMirror; schema: SettingsSchemaService }) {
     super(ctx, 'settingsScope')
+    this.mirror = config.mirror
+    this.schema = config.schema
+  }
+
+  /**
+   * The shared mirror's read/fold face for cross-namespace surfaces (schema
+   * introspection, the served-namespace directory). Per-namespace consumers
+   * use {@link bind}; both derive from the same snapshot, so they can never
+   * disagree about the document.
+   * @returns the describe face over the shared mirror.
+   */
+  describe(): SettingsDescribeFace {
+    return this.mirror
   }
 
   /**
-   * Bind one namespace scope to settings and connection invalidations on the
-   * CALLER's plugin lifecycle — the service proxy binds `this.ctx` to the
-   * caller at call time, so the scope's disposer belongs to the calling fiber.
-   * Listeners exist before the initial background read starts, so activation
-   * never blocks on the settings transport. The caller injects `connection`
-   * for the transport and `remote` for the forwarded settings invalidation.
+   * Bind one namespace scope on the CALLER's plugin lifecycle — the service
+   * proxy binds `this.ctx` to the caller at call time, so the scope's disposer
+   * belongs to the calling fiber. The scope derives from the shared mirror
+   * (whose invalidation subscriptions live with the providing plugin), so
+   * binding adds no wire read of its own and activation never blocks on the
+   * settings transport.
    * @param spec - domain-owned namespace contract.
    * @returns the bound scope consumed by the domain's services and rows.
    */
@@ -250,21 +278,13 @@ export class SettingsScopeBinder extends Service {
     const controller = new SettingsScopeController<T>(
       connection.api,
       spec,
+      this.mirror,
       connection.isLoopback ? 'host' : 'memory',
       this.schema,
     )
     ctx.effect(() => {
-      const refresh = (namespace?: string): void => {
-        if (namespace !== undefined && namespace !== spec.namespace) return
-        void controller.load()
-      }
-      const disposers = [
-        (ctx.get('remote') as Context['remote']).$on('settings/document-updated', refresh),
-        ctx.on('connection/reset', () => { refresh() }),
-      ]
-      void controller.load()
+      void this.mirror.ensure()
       return async () => {
-        for (const dispose of disposers) dispose()
         await controller.dispose()
       }
     }, `ui-settings: ${spec.namespace} settings scope`)

packages/client/ui-settings/tests/plugin.client.spec.ts

@@ -1,33 +1,60 @@
 /**
  * The settings domain base plugin's own mounting behavior: it stands up
- * `ctx.settingsScope` for every feature that owns a preference row, and the
- * service retires with its fiber.
+ * `ctx.settingsScope` over one shared describe mirror, keeps that mirror
+ * fresh on settings-document and connection-reset invalidations, and retires
+ * both the service and the subscriptions with its fiber.
  */
 import { Context } from '@deepseek-ai/cordis'
-import { describe, expect, it } from 'vitest'
+import { describe, expect, it, vi } from 'vitest'
+import { TestRemote } from '@deepseek-ai/dsh-client-test-runtime'
 import { apply, inject } from '../src/client/index.ts'
 import { SettingsSchemaService } from '../src/client/schema.ts'
 import { SettingsScopeBinder } from '../src/client/settings-scope.ts'
 
-/** Boot the browser half over a bare root context; it injects nothing. */
+/** Boot the browser half over a fake loopback connection and test remote. */
 function bench() {
+  const describeCall = vi.fn().mockResolvedValue({
+    rpcId: 'plugin-bench' as never,
+    result: { ok: true, value: { writable: true, hasDocument: true, namespaces: [] } },
+  })
   const ctx = new Context()
-  return { ctx, fiber: ctx.plugin({ inject: [...inject], apply }) }
+  ctx.provide('connection', {
+    api: { settings: { describe: describeCall } },
+    isLoopback: true,
+  } as never)
+  new TestRemote(ctx)
+  return { ctx, describeCall, fiber: ctx.plugin({ inject: [...inject], apply }) }
 }
 
 describe('settings domain base plugin', () => {
-  it('mounts the scope service under settingsScope', async () => {
-    const { ctx, fiber } = bench()
+  it('mounts the scope service under settingsScope and reads once eagerly', async () => {
+    const { ctx, describeCall, fiber } = bench()
     await fiber.await()
     expect(ctx.get('settingsScope')).toBeInstanceOf(SettingsScopeBinder)
     expect(ctx.get('settingsSchema')).toBeInstanceOf(SettingsSchemaService)
+    await vi.waitFor(() => { expect(describeCall).toHaveBeenCalledTimes(1) })
+  })
+
+  it('refreshes the mirror on document commits and connection resets, once each', async () => {
+    const { ctx, describeCall, fiber } = bench()
+    await fiber.await()
+    await vi.waitFor(() => { expect(describeCall).toHaveBeenCalledTimes(1) })
+    ctx.remote.$dispatch('settings/document-updated', ['ui-test', 0])
+    await vi.waitFor(() => { expect(describeCall).toHaveBeenCalledTimes(2) })
+    ctx.emit('connection/reset')
+    await vi.waitFor(() => { expect(describeCall).toHaveBeenCalledTimes(3) })
   })
 
-  it('fiber disposal retires the service', async () => {
-    const { ctx, fiber } = bench()
+  it('fiber disposal retires the service and its invalidation subscriptions', async () => {
+    const { ctx, describeCall, fiber } = bench()
     await fiber.await()
+    await vi.waitFor(() => { expect(describeCall).toHaveBeenCalledTimes(1) })
     await fiber.dispose()
     expect(ctx.get('settingsScope')).toBeUndefined()
     expect(ctx.get('settingsSchema')).toBeUndefined()
+    ctx.remote.$dispatch('settings/document-updated', ['ui-test', 0])
+    ctx.emit('connection/reset')
+    await Promise.resolve()
+    expect(describeCall).toHaveBeenCalledTimes(1)
   })
 })

packages/client/ui-settings/tests/settings-mirror.client.spec.ts

@@ -0,0 +1,216 @@
+import { describe, expect, it, vi } from 'vitest'
+import type { RpcResponse, SettingsNamespaceView } from '@deepseek-ai/dsh-api-remotes/client'
+import { SettingsDescribeMirror, type SettingsDescribeView } from '../src/client/settings-mirror.ts'
+
+let rpc = 0
+
+function ok<T>(value: T): RpcResponse<T> {
+  return { rpcId: `mirror-${rpc++}` as never, result: { ok: true, value } }
+}
+
+function rejected<T>(message: string): RpcResponse<T> {
+  return {
+    rpcId: `mirror-${rpc++}` as never,
+    result: {
+      ok: false,
+      error: { code: 'settings-rejected', message, details: { ns: 'theme' } },
+    },
+  }
+}
+
+function view(ns: string, revision = 0): SettingsNamespaceView {
+  return { ns, schema: {}, value: { field: ns }, applies: 'live', secrets: [], revision }
+}
+
+function described(namespaces: SettingsNamespaceView[]): RpcResponse<SettingsDescribeView> {
+  return ok({ writable: true, hasDocument: true, namespaces })
+}
+
+function deferred<T>() {
+  let resolve!: (value: T) => void
+  const promise = new Promise<T>((res) => { resolve = res })
+  return { promise, resolve }
+}
+
+describe('SettingsDescribeMirror', () => {
+  it('folds loads before the wire read into it, and mid-flight loads into one rerun', async () => {
+    const gate = deferred<RpcResponse<SettingsDescribeView>>()
+    const describeCall = vi.fn()
+      .mockReturnValueOnce(gate.promise)
+      .mockResolvedValue(described([view('theme', 1)]))
+    const mirror = new SettingsDescribeMirror({ settings: { describe: describeCall } } as never)
+    const first = mirror.load()
+    // Issued before the wire read goes out: covered by that read, no rerun.
+    const early = mirror.load()
+    await Promise.resolve()
+    expect(describeCall).toHaveBeenCalledTimes(1)
+    // Issued while the read is on the wire: exactly one rerun, however many.
+    const mid = mirror.load()
+    const midToo = mirror.load()
+    gate.resolve(described([view('theme', 0)]))
+    await Promise.all([first, early, mid, midToo])
+    expect(describeCall).toHaveBeenCalledTimes(2)
+    expect(mirror.getSnapshot().status).toBe('ready')
+    expect(mirror.namespace('theme')?.revision).toBe(1)
+  })
+
+  it('keeps the last good view when a later refresh fails, recording the failure', async () => {
+    const describeCall = vi.fn()
+      .mockResolvedValueOnce(described([view('theme', 2)]))
+      .mockRejectedValueOnce(new Error('host gone'))
+      .mockResolvedValueOnce(rejected('busy'))
+    const mirror = new SettingsDescribeMirror({ settings: { describe: describeCall } } as never)
+    await mirror.load()
+    expect(mirror.getSnapshot()).toMatchObject({ status: 'ready', error: null })
+    await mirror.load()
+    expect(mirror.getSnapshot()).toMatchObject({ status: 'ready', error: 'host gone' })
+    expect(mirror.namespace('theme')?.revision).toBe(2)
+    await mirror.load()
+    expect(mirror.getSnapshot()).toMatchObject({ status: 'ready', error: 'busy' })
+    expect(mirror.getSnapshot().view?.namespaces).toHaveLength(1)
+  })
+
+  it('returns to idle after a first read that never succeeded, so ensure retries', async () => {
+    const describeCall = vi.fn()
+      .mockRejectedValueOnce(new Error('offline'))
+      .mockResolvedValueOnce(described([view('theme', 1)]))
+    const mirror = new SettingsDescribeMirror({ settings: { describe: describeCall } } as never)
+    await mirror.ensure()
+    expect(mirror.getSnapshot()).toMatchObject({ status: 'idle', view: undefined, error: 'offline' })
+    await mirror.ensure()
+    expect(mirror.getSnapshot()).toMatchObject({ status: 'ready', error: null })
+    expect(describeCall).toHaveBeenCalledTimes(2)
+  })
+
+  it('treats ensure as a no-op once ready', async () => {
+    const describeCall = vi.fn().mockResolvedValue(described([view('theme', 1)]))
+    const mirror = new SettingsDescribeMirror({ settings: { describe: describeCall } } as never)
+    await mirror.ensure()
+    await mirror.ensure()
+    await mirror.ensure()
+    expect(describeCall).toHaveBeenCalledTimes(1)
+  })
+
+  it('memory persistence is terminally unavailable and never touches the wire', async () => {
+    const describeCall = vi.fn()
+    const mirror = new SettingsDescribeMirror({ settings: { describe: describeCall } } as never, 'memory')
+    await mirror.ensure()
+    await mirror.load()
+    expect(mirror.getSnapshot()).toEqual({ status: 'unavailable', view: undefined, error: null })
+    expect(describeCall).not.toHaveBeenCalled()
+  })
+
+  it('acceptView folds one write answer into the held view without a wire read', async () => {
+    const describeCall = vi.fn()
+      .mockResolvedValueOnce(described([view('theme', 1), view('locale', 4)]))
+    const mirror = new SettingsDescribeMirror({ settings: { describe: describeCall } } as never)
+    await mirror.load()
+    const seen: number[] = []
+    mirror.subscribe(() => { seen.push(mirror.namespace('theme')?.revision ?? -1) })
+    mirror.acceptView(view('theme', 9))
+    expect(mirror.namespace('theme')?.revision).toBe(9)
+    expect(mirror.namespace('locale')?.revision).toBe(4)
+    expect(seen).toEqual([9])
+    expect(describeCall).toHaveBeenCalledTimes(1)
+  })
+
+  it('acceptView before any answer is a no-op instead of inventing a document', () => {
+    const describeCall = vi.fn()
+    const mirror = new SettingsDescribeMirror({ settings: { describe: describeCall } } as never)
+    mirror.acceptView(view('theme', 1))
+    expect(mirror.getSnapshot()).toEqual({ status: 'idle', view: undefined, error: null })
+  })
+
+  it('acceptView appends a namespace the held view has not seen yet', async () => {
+    const describeCall = vi.fn().mockResolvedValueOnce(described([view('theme', 1)]))
+    const mirror = new SettingsDescribeMirror({ settings: { describe: describeCall } } as never)
+    await mirror.load()
+    mirror.acceptView(view('fresh-ns', 0))
+    expect(mirror.namespace('fresh-ns')).toBeDefined()
+    expect(mirror.getSnapshot().view?.namespaces).toHaveLength(2)
+  })
+
+  it('never loses a load landing between a run settling and its slot clearing', async () => {
+    // Regression: with the in-flight slot cleared by a promise .finally(),
+    // a load() in the one-microtask gap after the rerun check marked a rerun
+    // nobody read, and that refresh never reached the wire.
+    const describeCall = vi.fn().mockResolvedValue(described([view('theme', 1)]))
+    const mirror = new SettingsDescribeMirror({ settings: { describe: describeCall } } as never)
+    void mirror.load()
+    await vi.waitFor(() => { expect(describeCall).toHaveBeenCalledTimes(1) })
+    void mirror.load()
+    await vi.waitFor(() => { expect(describeCall).toHaveBeenCalledTimes(2) })
+    void mirror.load()
+    await vi.waitFor(() => { expect(describeCall).toHaveBeenCalledTimes(3) })
+  })
+
+  it('starts no second run for a load issued inside the loading publish', async () => {
+    const gate = deferred<RpcResponse<SettingsDescribeView>>()
+    const describeCall = vi.fn().mockReturnValue(gate.promise)
+    const mirror = new SettingsDescribeMirror({ settings: { describe: describeCall } } as never)
+    let reentered = false
+    const unsubscribe = mirror.subscribe(() => {
+      if (reentered) return
+      reentered = true
+      void mirror.load()
+    })
+    const loading = mirror.load()
+    await Promise.resolve()
+    expect(describeCall).toHaveBeenCalledTimes(1)
+    gate.resolve(described([view('theme', 1)]))
+    await loading
+    unsubscribe()
+    // The reentrant load folded into the first run rather than racing it.
+    expect(describeCall).toHaveBeenCalledTimes(1)
+    expect(mirror.getSnapshot().status).toBe('ready')
+  })
+
+  it('lets the first read cover a write folded inside the loading publish', async () => {
+    const describeCall = vi.fn().mockResolvedValue(described([view('theme', 2)]))
+    const mirror = new SettingsDescribeMirror({ settings: { describe: describeCall } } as never)
+    const unsubscribe = mirror.subscribe(() => {
+      unsubscribe()
+      mirror.acceptView(view('theme', 2))
+    })
+
+    await mirror.load()
+
+    expect(describeCall).toHaveBeenCalledTimes(1)
+    expect(mirror.getSnapshot().status).toBe('ready')
+    expect(mirror.namespace('theme')?.revision).toBe(2)
+  })
+
+  it('re-reads after a folded write invalidates an in-flight document', async () => {
+    const slow = deferred<RpcResponse<SettingsDescribeView>>()
+    const describeCall = vi.fn()
+      .mockResolvedValueOnce(described([view('theme', 4), view('locale', 1)]))
+      .mockReturnValueOnce(slow.promise)
+      .mockResolvedValueOnce(described([view('theme', 5), view('locale', 2)]))
+    const mirror = new SettingsDescribeMirror({ settings: { describe: describeCall } } as never)
+    await mirror.load()
+    expect(describeCall).toHaveBeenCalledTimes(1)
+    const stale = mirror.load()
+    await Promise.resolve()
+    mirror.acceptView(view('theme', 5))
+    slow.resolve(described([view('theme', 4), view('locale', 2)]))
+    await stale
+    expect(describeCall).toHaveBeenCalledTimes(3)
+    expect(mirror.namespace('theme')?.revision).toBe(5)
+    expect(mirror.namespace('locale')?.revision).toBe(2)
+  })
+
+  it('re-reads after a pre-answer write invalidates the in-flight document', async () => {
+    const slow = deferred<RpcResponse<SettingsDescribeView>>()
+    const describeCall = vi.fn()
+      .mockReturnValueOnce(slow.promise)
+      .mockResolvedValueOnce(described([view('theme', 2)]))
+    const mirror = new SettingsDescribeMirror({ settings: { describe: describeCall } } as never)
+    const loading = mirror.load()
+    await Promise.resolve()
+    mirror.acceptView(view('theme', 2))
+    slow.resolve(described([view('theme', 1)]))
+    await loading
+    expect(describeCall).toHaveBeenCalledTimes(2)
+    expect(mirror.namespace('theme')?.revision).toBe(2)
+  })
+})

packages/client/ui-settings/tests/settings-scope.client.spec.ts

@@ -1,13 +1,14 @@
 import { Context } from '@deepseek-ai/cordis'
 import z from '@deepseek-ai/schemastery'
 import { describe, expect, it, vi } from 'vitest'
-import type { IApiClient, RpcResponse, SettingsNamespaceView } from '@deepseek-ai/dsh-api-remotes/client'
+import type { RpcResponse, SettingsNamespaceView } from '@deepseek-ai/dsh-api-remotes/client'
 import { TestRemote } from '@deepseek-ai/dsh-client-test-runtime'
-import type { SettingsScope, SettingsScopeSpec } from '@deepseek-ai/dsh-client-runtime/client'
+import type { SettingsScope } from '@deepseek-ai/dsh-client-runtime/client'
 import { SettingsSchemaService } from '../src/client/schema.ts'
-import {
-  SettingsScopeBinder, SettingsScopeController as ProductionSettingsScopeController,
-} from '../src/client/settings-scope.ts'
+import { SettingsScopeController, SettingsScopeBinder } from '../src/client/settings-scope.ts'
+import { SettingsDescribeMirror } from '../src/client/settings-mirror.ts'
+
+const settingsSchema = new SettingsSchemaService(new Context())
 
 interface UiTestSettings {
   preference: 'light' | 'dark' | 'system'
@@ -17,17 +18,6 @@ const ENVELOPE = z.object({
   preference: z.union(['light', 'dark', 'system']).default('system'),
 }).toJSON()
 
-const settingsSchema = new SettingsSchemaService(new Context())
-const SettingsScopeController = class<T> extends ProductionSettingsScopeController<T> {
-  constructor(
-    api: Pick<IApiClient, 'settings'>,
-    spec: SettingsScopeSpec<T>,
-    persistence: 'host' | 'memory' = 'host',
-  ) {
-    super(api, spec, persistence, settingsSchema)
-  }
-}
-
 let rpc = 0
 
 function ok<T>(value: T): RpcResponse<T> {
@@ -66,6 +56,17 @@ function deferred<T>() {
   return { promise, resolve, reject }
 }
 
+/** A host-mode mirror plus a controller derived from it, over one fake wire. */
+function derivedScope(
+  api: { describe?: ReturnType<typeof vi.fn>; mutate?: ReturnType<typeof vi.fn> },
+  spec: { namespace: string; decode?: (section: unknown) => UiTestSettings | undefined } = { namespace: 'ui-test' },
+) {
+  const wire = { settings: api } as never
+  const mirror = new SettingsDescribeMirror(wire)
+  const scope = new SettingsScopeController<UiTestSettings>(wire, spec, mirror, 'host', settingsSchema)
+  return { mirror, scope }
+}
+
 /** Record each distinct published section, starting from the current one. */
 function trackValues(scope: SettingsScope<UiTestSettings>): Array<UiTestSettings | undefined> {
   const seen: Array<UiTestSettings | undefined> = [scope.getSnapshot().value]
@@ -77,16 +78,13 @@ function trackValues(scope: SettingsScope<UiTestSettings>): Array<UiTestSettings
 }
 
 describe('SettingsScopeController', () => {
-  it('starts loading and publishes a schema-valid section with revision and writability', async () => {
+  it('starts loading and derives a schema-valid section with revision and writability', async () => {
     const describeCall = vi.fn().mockResolvedValueOnce(described({ preference: 'dark' }, 3))
-    const scope = new SettingsScopeController<UiTestSettings>(
-      { settings: { describe: describeCall } } as never,
-      { namespace: 'ui-test' },
-    )
+    const { mirror, scope } = derivedScope({ describe: describeCall })
     expect(scope.getSnapshot()).toEqual({
       status: 'loading', value: undefined, revision: undefined, writable: false, mode: 'host',
     })
-    await scope.load()
+    await mirror.load()
     expect(scope.getSnapshot()).toEqual({
       status: 'ready', value: { preference: 'dark' }, revision: 3, writable: true, mode: 'host',
     })
@@ -101,12 +99,9 @@ describe('SettingsScopeController', () => {
       .mockResolvedValueOnce(described(['queue'], 7))
       .mockResolvedValueOnce(rejected())
       .mockRejectedValueOnce(new Error('offline'))
-    const scope = new SettingsScopeController<UiTestSettings>(
-      { settings: { describe: describeCall } } as never,
-      { namespace: 'ui-test' },
-    )
+    const { mirror, scope } = derivedScope({ describe: describeCall })
     const good = trackValues(scope)
-    for (let i = 0; i < 7; i++) await scope.load()
+    for (let i = 0; i < 7; i++) await mirror.load()
     expect(scope.getSnapshot()).toMatchObject({
       status: 'ready', value: { preference: 'dark' }, revision: 7,
     })
@@ -117,45 +112,22 @@ describe('SettingsScopeController', () => {
     const broken = { ...view({ preference: 'dark' }, 2), schema: null }
     const describeCall = vi.fn()
       .mockResolvedValueOnce(ok({ writable: true, hasDocument: true, namespaces: [broken] }))
-    const scope = new SettingsScopeController<UiTestSettings>(
-      { settings: { describe: describeCall } } as never,
-      { namespace: 'ui-test' },
-    )
-    await scope.load()
+    const { mirror, scope } = derivedScope({ describe: describeCall })
+    await mirror.load()
     expect(scope.getSnapshot()).toMatchObject({ status: 'loading', value: undefined, revision: 2 })
   })
 
-  it('suppresses a superseded read of an unexposed namespace', async () => {
-    const describeCall = vi.fn()
-      .mockResolvedValueOnce(ok({ writable: true, hasDocument: true, namespaces: [] }))
-      .mockResolvedValueOnce(described({ preference: 'dark' }, 1))
-    const scope = new SettingsScopeController<UiTestSettings>(
-      { settings: { describe: describeCall } } as never,
-      { namespace: 'ui-test' },
-    )
-    const statuses: string[] = []
-    scope.subscribe(() => { statuses.push(scope.getSnapshot().status) })
-    const stale = scope.load()
-    const fresh = scope.load()
-    await Promise.all([stale, fresh])
-    expect(statuses).not.toContain('unavailable')
-    expect(scope.getSnapshot()).toMatchObject({ status: 'ready', value: { preference: 'dark' } })
-  })
-
   it('reports an unexposed namespace as unavailable and recovers when it reappears', async () => {
     const describeCall = vi.fn()
       .mockResolvedValueOnce(described({ preference: 'light' }, 1))
       .mockResolvedValueOnce(ok({ writable: true, hasDocument: true, namespaces: [] }))
       .mockResolvedValueOnce(described({ preference: 'system' }, 2))
-    const scope = new SettingsScopeController<UiTestSettings>(
-      { settings: { describe: describeCall } } as never,
-      { namespace: 'ui-test' },
-    )
-    await scope.load()
+    const { mirror, scope } = derivedScope({ describe: describeCall })
+    await mirror.load()
     expect(scope.getSnapshot().status).toBe('ready')
-    await scope.load()
+    await mirror.load()
     expect(scope.getSnapshot()).toMatchObject({ status: 'unavailable', value: { preference: 'light' } })
-    await scope.load()
+    await mirror.load()
     expect(scope.getSnapshot()).toMatchObject({ status: 'ready', value: { preference: 'system' }, revision: 2 })
   })
 
@@ -163,18 +135,15 @@ describe('SettingsScopeController', () => {
     const describeCall = vi.fn()
       .mockResolvedValueOnce(described({ preference: 'light' }, 1))
       .mockResolvedValueOnce(described({ preference: 'dark' }, 2))
-    const scope = new SettingsScopeController<UiTestSettings>(
-      { settings: { describe: describeCall } } as never,
-      {
-        namespace: 'ui-test',
-        decode: section => (section as UiTestSettings).preference === 'dark'
-          ? section as UiTestSettings
-          : undefined,
-      },
-    )
-    await scope.load()
+    const { mirror, scope } = derivedScope({ describe: describeCall }, {
+      namespace: 'ui-test',
+      decode: section => (section as UiTestSettings).preference === 'dark'
+        ? section as UiTestSettings
+        : undefined,
+    })
+    await mirror.load()
     expect(scope.getSnapshot()).toMatchObject({ status: 'loading', value: undefined, revision: 1 })
-    await scope.load()
+    await mirror.load()
     expect(scope.getSnapshot()).toMatchObject({ status: 'ready', value: { preference: 'dark' }, revision: 2 })
   })
 
@@ -184,12 +153,9 @@ describe('SettingsScopeController', () => {
     const mutate = vi.fn()
       .mockReturnValueOnce(first.promise)
       .mockResolvedValueOnce(ok(view({ preference: 'light' }, 6)))
-    const scope = new SettingsScopeController<UiTestSettings>(
-      { settings: { describe: describeCall, mutate } } as never,
-      { namespace: 'ui-test' },
-    )
+    const { mirror, scope } = derivedScope({ describe: describeCall, mutate })
     const published = trackValues(scope)
-    await scope.load()
+    await mirror.load()
     const dark = scope.set('preference', 'dark')
     const light = scope.set('preference', 'light')
     await vi.waitFor(() => { expect(mutate).toHaveBeenCalledOnce() })
@@ -209,6 +175,41 @@ describe('SettingsScopeController', () => {
     })
   })
 
+  it('folds the latest write answer into the mirror so a sibling scope sees it', async () => {
+    const describeCall = vi.fn().mockResolvedValueOnce(described({ preference: 'system' }, 4))
+    const mutate = vi.fn().mockResolvedValueOnce(ok(view({ preference: 'dark' }, 5)))
+    const wire = { settings: { describe: describeCall, mutate } } as never
+    const mirror = new SettingsDescribeMirror(wire)
+    const writer = new SettingsScopeController<UiTestSettings>(wire, { namespace: 'ui-test' }, mirror, 'host', settingsSchema)
+    const sibling = new SettingsScopeController<UiTestSettings>(wire, { namespace: 'ui-test' }, mirror, 'host', settingsSchema)
+    await mirror.load()
+    await writer.set('preference', 'dark')
+    expect(describeCall).toHaveBeenCalledTimes(1)
+    expect(sibling.getSnapshot()).toMatchObject({ value: { preference: 'dark' }, revision: 5 })
+  })
+
+  it('re-reads after a revisionless first write lands during the initial read', async () => {
+    const initial = deferred<ReturnType<typeof described>>()
+    const describeCall = vi.fn()
+      .mockReturnValueOnce(initial.promise)
+      .mockResolvedValueOnce(described({ preference: 'dark' }, 2))
+    const mutate = vi.fn().mockResolvedValueOnce(ok(view({ preference: 'dark' }, 2)))
+    const { mirror, scope } = derivedScope({ describe: describeCall, mutate })
+    const loading = mirror.load()
+    await Promise.resolve()
+
+    await scope.set('preference', 'dark')
+    initial.resolve(described({ preference: 'system' }, 1))
+    await loading
+
+    expect(mutate).toHaveBeenCalledWith({
+      ns: 'ui-test',
+      ops: [{ op: 'set', path: ['preference'], value: 'dark' }],
+    })
+    expect(describeCall).toHaveBeenCalledTimes(2)
+    expect(scope.getSnapshot()).toMatchObject({ value: { preference: 'dark' }, revision: 2 })
+  })
+
   it('recovers the latest rejected or thrown write from Host state', async () => {
     const describeCall = vi.fn()
       .mockResolvedValueOnce(described({ preference: 'system' }, 2))
@@ -216,63 +217,74 @@ describe('SettingsScopeController', () => {
     const mutate = vi.fn()
       .mockResolvedValueOnce(rejected())
       .mockRejectedValueOnce(new Error('offline'))
-    const scope = new SettingsScopeController<UiTestSettings>(
-      { settings: { describe: describeCall, mutate } } as never,
-      { namespace: 'ui-test' },
-    )
+    const { mirror, scope } = derivedScope({ describe: describeCall, mutate })
     const published = trackValues(scope)
+    await mirror.load()
     await scope.set('preference', 'dark')
     await scope.set('preference', 'system')
     expect(published.map(section => section?.preference)).toEqual([undefined, 'system', 'light'])
   })
 
   it('does not recover superseded rejected or thrown writes', async () => {
-    const describeCall = vi.fn()
+    const describeCall = vi.fn().mockResolvedValueOnce(described({ preference: 'system' }, 2))
     const mutate = vi.fn()
       .mockResolvedValueOnce(rejected())
       .mockRejectedValueOnce(new Error('offline'))
       .mockResolvedValueOnce(ok(view({ preference: 'light' }, 3)))
-    const scope = new SettingsScopeController<UiTestSettings>(
-      { settings: { describe: describeCall, mutate } } as never,
-      { namespace: 'ui-test' },
-    )
+    const { mirror, scope } = derivedScope({ describe: describeCall, mutate })
     const published = trackValues(scope)
+    await mirror.load()
     await Promise.all([
       scope.set('preference', 'dark'),
       scope.set('preference', 'system'),
       scope.set('preference', 'light'),
     ])
-    expect(describeCall).not.toHaveBeenCalled()
-    expect(published.map(section => section?.preference)).toEqual([undefined, 'light'])
+    expect(describeCall).toHaveBeenCalledTimes(1)
+    expect(published.map(section => section?.preference)).toEqual([undefined, 'system', 'light'])
   })
 
   it('keeps the write queue usable when a subscriber throws', async () => {
     const describeCall = vi.fn()
       .mockResolvedValueOnce(described({ preference: 'dark' }, 1))
       .mockResolvedValueOnce(described({ preference: 'light' }, 2))
-    const scope = new SettingsScopeController<UiTestSettings>(
-      { settings: { describe: describeCall } } as never,
-      { namespace: 'ui-test' },
-    )
+    const { mirror, scope } = derivedScope({ describe: describeCall })
     let thrown = false
     scope.subscribe(() => {
       if (thrown) return
       thrown = true
       throw new Error('subscriber failed')
     })
-    await expect(scope.load()).rejects.toThrow('subscriber failed')
-    await expect(scope.load()).resolves.toBeUndefined()
+    await expect(mirror.load()).rejects.toThrow('subscriber failed')
+    await expect(mirror.load()).resolves.toBeUndefined()
     expect(scope.getSnapshot()).toMatchObject({ value: { preference: 'light' }, revision: 2 })
   })
 
+  it('keeps the write queue usable when a write publication listener throws', async () => {
+    const describeCall = vi.fn().mockResolvedValueOnce(described({ preference: 'system' }, 1))
+    const mutate = vi.fn()
+      .mockResolvedValueOnce(ok(view({ preference: 'dark' }, 2)))
+      .mockResolvedValueOnce(ok(view({ preference: 'light' }, 3)))
+    const { mirror, scope } = derivedScope({ describe: describeCall, mutate })
+    await mirror.load()
+    let shouldThrow = true
+    mirror.subscribe(() => {
+      if (!shouldThrow) return
+      shouldThrow = false
+      throw new Error('write subscriber failed')
+    })
+
+    await expect(scope.set('preference', 'dark')).rejects.toThrow('write subscriber failed')
+    await expect(scope.set('preference', 'light')).resolves.toBeUndefined()
+
+    expect(mutate).toHaveBeenCalledTimes(2)
+    expect(scope.getSnapshot()).toMatchObject({ value: { preference: 'light' }, revision: 3 })
+  })
+
   it('cancels queued and post-dispose writes while draining the in-flight mutation', async () => {
     const first = deferred<RpcResponse<SettingsNamespaceView>>()
     const mutate = vi.fn().mockReturnValue(first.promise)
     const describeCall = vi.fn()
-    const scope = new SettingsScopeController<UiTestSettings>(
-      { settings: { describe: describeCall, mutate } } as never,
-      { namespace: 'ui-test' },
-    )
+    const { scope } = derivedScope({ describe: describeCall, mutate })
     const published = trackValues(scope)
     const dark = scope.set('preference', 'dark')
     await vi.waitFor(() => { expect(mutate).toHaveBeenCalledOnce() })
@@ -284,24 +296,66 @@ describe('SettingsScopeController', () => {
     first.resolve(ok(view({ preference: 'dark' }, 1)))
     await Promise.all([dark, light, stop])
     await scope.set('preference', 'system')
-    await scope.load()
     expect(mutate).toHaveBeenCalledOnce()
     expect(describeCall).not.toHaveBeenCalled()
     expect(published).toEqual([undefined])
   })
 
+  it('stops deriving from the mirror after dispose', async () => {
+    const describeCall = vi.fn()
+      .mockResolvedValueOnce(described({ preference: 'dark' }, 1))
+      .mockResolvedValueOnce(described({ preference: 'light' }, 2))
+    const { mirror, scope } = derivedScope({ describe: describeCall })
+    await mirror.load()
+    expect(scope.getSnapshot()).toMatchObject({ value: { preference: 'dark' } })
+    await scope.dispose()
+    await mirror.load()
+    expect(scope.getSnapshot()).toMatchObject({ value: { preference: 'dark' }, revision: 1 })
+  })
+
+  it('ignores a mirror notification already queued when disposal starts', async () => {
+    let notify = (): void => {}
+    let snapshot = {
+      status: 'ready' as const,
+      view: {
+        writable: true, hasDocument: true,
+        namespaces: [view({ preference: 'dark' }, 1)],
+      },
+      error: null,
+    }
+    const mirror = {
+      getSnapshot: () => snapshot,
+      subscribe: (listener: () => void) => {
+        notify = listener
+        return () => {}
+      },
+    } as never
+    const wire = { settings: {} } as never
+    const scope = new SettingsScopeController<UiTestSettings>(
+      wire, { namespace: 'ui-test' }, mirror, 'host', settingsSchema)
+    expect(scope.getSnapshot()).toMatchObject({ value: { preference: 'dark' }, revision: 1 })
+
+    await scope.dispose()
+    snapshot = {
+      ...snapshot,
+      view: { ...snapshot.view, namespaces: [view({ preference: 'light' }, 2)] },
+    }
+    notify()
+
+    expect(scope.getSnapshot()).toMatchObject({ value: { preference: 'dark' }, revision: 1 })
+  })
+
   it('keeps a remote browser in memory mode without Host calls', async () => {
     const describeCall = vi.fn()
     const mutate = vi.fn()
+    const wire = { settings: { describe: describeCall, mutate } } as never
+    const mirror = new SettingsDescribeMirror(wire, 'memory')
     const scope = new SettingsScopeController<UiTestSettings>(
-      { settings: { describe: describeCall, mutate } } as never,
-      { namespace: 'ui-test' },
-      'memory',
-    )
+      wire, { namespace: 'ui-test' }, mirror, 'memory', settingsSchema)
     expect(scope.getSnapshot()).toEqual({
       status: 'unavailable', value: undefined, revision: undefined, writable: false, mode: 'memory',
     })
-    await scope.load()
+    await mirror.load()
     await scope.set('preference', 'dark')
     await scope.dispose()
     expect(describeCall).not.toHaveBeenCalled()
@@ -316,12 +370,9 @@ describe('SettingsScopeController', () => {
     }
     const describeCall = vi.fn()
       .mockResolvedValueOnce(ok({ writable: true, hasDocument: true, namespaces: [layered] }))
-    const scope = new SettingsScopeController<UiTestSettings>(
-      { settings: { describe: describeCall } } as never,
-      { namespace: 'ui-test' },
-    )
+    const { mirror, scope } = derivedScope({ describe: describeCall })
 
-    await scope.load()
+    await mirror.load()
 
     expect(scope.getSnapshot()).toMatchObject({
       value: { preference: 'dark' },
@@ -334,12 +385,9 @@ describe('SettingsScopeController', () => {
     const inherited: SettingsNamespaceView = { ...view({ preference: 'system' }, 1), base: { preference: 'system' } }
     const describeCall = vi.fn()
       .mockResolvedValueOnce(ok({ writable: true, hasDocument: true, namespaces: [inherited] }))
-    const scope = new SettingsScopeController<UiTestSettings>(
-      { settings: { describe: describeCall } } as never,
-      { namespace: 'ui-test' },
-    )
+    const { mirror, scope } = derivedScope({ describe: describeCall })
 
-    await scope.load()
+    await mirror.load()
 
     expect(scope.getSnapshot().user).toBeUndefined()
   })
@@ -347,11 +395,8 @@ describe('SettingsScopeController', () => {
   it('clears one field through an unset op fenced by the held revision', async () => {
     const mutate = vi.fn().mockResolvedValueOnce(ok(view({ preference: 'system' }, 4)))
     const describeCall = vi.fn().mockResolvedValueOnce(described({ preference: 'dark' }, 3))
-    const scope = new SettingsScopeController<UiTestSettings>(
-      { settings: { describe: describeCall, mutate } } as never,
-      { namespace: 'ui-test' },
-    )
-    await scope.load()
+    const { mirror, scope } = derivedScope({ describe: describeCall, mutate })
+    await mirror.load()
 
     await scope.unset('preference')
 
@@ -368,64 +413,54 @@ describe('SettingsScopeController', () => {
     const describeCall = vi.fn()
       .mockResolvedValueOnce(described({ preference: 'dark' }, 3))
       .mockResolvedValueOnce(described({ preference: 'light' }, 5))
-    const scope = new SettingsScopeController<UiTestSettings>(
-      { settings: { describe: describeCall, mutate } } as never,
-      { namespace: 'ui-test' },
-    )
-    await scope.load()
+    const { mirror, scope } = derivedScope({ describe: describeCall, mutate })
+    await mirror.load()
 
     await scope.unset('preference')
 
     expect(scope.getSnapshot()).toMatchObject({ value: { preference: 'light' }, revision: 5 })
   })
 })
+
 describe('SettingsScopeBinder.bind', () => {
-  it('subscribes before the initial read and converges to the latest queued invalidation', async () => {
-    const initial = deferred<ReturnType<typeof described>>()
-    const describeCall = vi.fn()
-      .mockReturnValueOnce(initial.promise)
-      .mockResolvedValueOnce(described({ preference: 'light' }, 2))
-      .mockResolvedValueOnce(described({ preference: 'system' }, 3))
+  it('shares one mirror read across bound scopes and disposes each with its fiber', async () => {
+    const describeCall = vi.fn().mockResolvedValue(described({ preference: 'dark' }, 1))
+    const wire = { settings: { describe: describeCall } }
+    const mirror = new SettingsDescribeMirror(wire as never)
     const ctx = new Context()
-    ctx.provide('connection', {
-      api: { settings: { describe: describeCall } },
-      isLoopback: true,
-    } as never)
-    let scope!: SettingsScope<UiTestSettings>
+    ctx.provide('connection', { api: wire, isLoopback: true } as never)
+    let theme!: SettingsScope<UiTestSettings>
+    let locale!: SettingsScope<UiTestSettings>
     new TestRemote(ctx)
-    await ctx.plugin(SettingsScopeBinder, new SettingsSchemaService(ctx)).await()
+    await ctx.plugin(SettingsScopeBinder, { mirror, schema: settingsSchema }).await()
+    expect(ctx.settingsScope.describe()).toBe(mirror)
     const fiber = ctx.plugin({
       inject: ['connection', 'remote', 'settingsScope'],
       apply: (plugin: Context) => {
-        scope = plugin.settingsScope.bind<UiTestSettings>({ namespace: 'ui-test' })
+        theme = plugin.settingsScope.bind<UiTestSettings>({ namespace: 'ui-test' })
+        locale = plugin.settingsScope.bind<UiTestSettings>({ namespace: 'ui-test' })
       },
     })
     await fiber.await()
-    await vi.waitFor(() => { expect(describeCall).toHaveBeenCalledOnce() })
-    ctx.remote.$dispatch('settings/document-updated', ['unrelated', 0])
-    ctx.remote.$dispatch('settings/document-updated', ['ui-test', 0])
-    ctx.emit('connection/reset')
-    initial.resolve(described({ preference: 'dark' }, 1))
-    await vi.waitFor(() => { expect(describeCall).toHaveBeenCalledTimes(3) })
     await vi.waitFor(() => {
-      expect(scope.getSnapshot()).toMatchObject({ value: { preference: 'system' }, revision: 3 })
+      expect(theme.getSnapshot()).toMatchObject({ status: 'ready', value: { preference: 'dark' } })
+      expect(locale.getSnapshot()).toMatchObject({ status: 'ready', value: { preference: 'dark' } })
     })
+    expect(describeCall).toHaveBeenCalledTimes(1)
     await fiber.dispose()
-    ctx.remote.$dispatch('settings/document-updated', ['ui-test', 0])
-    await Promise.resolve()
-    expect(describeCall).toHaveBeenCalledTimes(3)
+    await mirror.load()
+    expect(theme.getSnapshot()).toMatchObject({ revision: 1 })
   })
 
   it('binds a remote browser in memory mode without starting a settings read', async () => {
     const describeCall = vi.fn()
+    const wire = { settings: { describe: describeCall } }
+    const mirror = new SettingsDescribeMirror(wire as never, 'memory')
     const ctx = new Context()
-    ctx.provide('connection', {
-      api: { settings: { describe: describeCall } },
-      isLoopback: false,
-    } as never)
+    ctx.provide('connection', { api: wire, isLoopback: false } as never)
     let scope!: SettingsScope<UiTestSettings>
     new TestRemote(ctx)
-    await ctx.plugin(SettingsScopeBinder, new SettingsSchemaService(ctx)).await()
+    await ctx.plugin(SettingsScopeBinder, { mirror, schema: settingsSchema }).await()
     const fiber = ctx.plugin({
       inject: ['connection', 'remote', 'settingsScope'],
       apply: (plugin: Context) => {

packages/client/ui-theme/tests/apply.client.spec.ts

@@ -6,8 +6,7 @@ import { describe, expect, it, vi } from 'vitest'
 import { SlotRegistry } from '@deepseek-ai/dsh-client-runtime/client'
 import { LocaleRuntime } from '@deepseek-ai/dsh-client-locale/client'
 import { TestRemote, usePinnedBrowserLanguages } from '@deepseek-ai/dsh-client-test-runtime'
-import { SettingsSchemaService } from '@deepseek-ai/dsh-client-ui-settings/src/client/schema.ts'
-import { SettingsScopeBinder } from '@deepseek-ai/dsh-client-ui-settings/src/client/settings-scope.ts'
+import { apply as settingsApply, inject as settingsInject } from '@deepseek-ai/dsh-client-ui-settings/client'
 import { apply, inject, SETTINGS_NS } from '@deepseek-ai/dsh-client-ui-theme/client'
 import type { AppearanceRowInjected, ThemeRuntime } from '@deepseek-ai/dsh-client-ui-theme/client'
 import { THEME_SETTINGS_NAMESPACE, ThemeSettingsSchema } from '../src/theme-settings.ts'
@@ -57,7 +56,7 @@ async function bench(isLoopback = true) {
   ctx.provide('connection', { api: { settings: { describe, mutate } }, isLoopback } as never)
   // The settings transport and the forwarded-event port the plugin injects.
   new TestRemote(ctx)
-  await ctx.plugin(SettingsScopeBinder, new SettingsSchemaService(ctx)).await()
+  await ctx.plugin({ inject: [...settingsInject], apply: settingsApply }).await()
   return {
     ctx, slots: ctx.get('slots') as SlotRegistry, locale, describe, mutate,
     setHostPreference: (next: string) => { preference = next },
@@ -128,13 +127,19 @@ describe('ui-theme apply', () => {
 
   it('loads Host settings at boot, refreshes its namespace, and keeps remote browsers process-local', async () => {
     const b = await bench()
+    // The shared mirror read once at bench time; a Host-side change reaches it
+    // through the document invalidation, exactly as production announces one.
     b.setHostPreference('dark')
+    b.ctx.remote.$dispatch('settings/document-updated', [THEME_SETTINGS_NAMESPACE, 0])
     declareItems(b.slots)
     await b.ctx.plugin({ inject: [...inject], apply }).await()
     const theme = b.ctx.get('theme') as ThemeRuntime
     await vi.waitFor(() => { expect(theme.getTheme().preference).toBe('dark') })
+    // The mirror refreshes on every document commit (ns-agnostic); the scope's
+    // derived value only moves when its own namespace changed.
     b.ctx.remote.$dispatch('settings/document-updated', ['unrelated', 0])
-    expect(b.describe).toHaveBeenCalledOnce()
+    await vi.waitFor(() => { expect(b.describe).toHaveBeenCalledTimes(3) })
+    expect(theme.getTheme().preference).toBe('dark')
     b.setHostPreference('light')
     b.ctx.remote.$dispatch('settings/document-updated', [THEME_SETTINGS_NAMESPACE, 0])
     await vi.waitFor(() => { expect(theme.getTheme().preference).toBe('light') })
@@ -152,12 +157,15 @@ describe('ui-theme apply', () => {
     expect(remote.mutate).not.toHaveBeenCalled()
   })
 
-  it('activates before a slow initial settings read and converges when it settles', async () => {
+  it('activates before a slow settings refresh and converges when it settles', async () => {
     const b = await bench()
     b.setHostPreference('dark')
     const describe = b.describe.getMockImplementation()!
     const pending = deferred<Awaited<ReturnType<typeof describe>>>()
     b.describe.mockImplementationOnce(() => pending.promise)
+    // The refresh hangs on the wire; the mirror keeps serving the last good
+    // answer, so activation never blocks on the settings transport.
+    b.ctx.remote.$dispatch('settings/document-updated', [THEME_SETTINGS_NAMESPACE, 0])
     const fiber = b.ctx.plugin({ inject: [...inject], apply })
     await fiber.await()
     const theme = b.ctx.get('theme') as ThemeRuntime
@@ -170,9 +178,10 @@ describe('ui-theme apply', () => {
   it('ignores an invalid preference crossing the settings wire', async () => {
     const b = await bench()
     b.setHostPreference('sepia')
+    b.ctx.remote.$dispatch('settings/document-updated', [THEME_SETTINGS_NAMESPACE, 0])
     await b.ctx.plugin({ inject: [...inject], apply }).await()
     const theme = b.ctx.get('theme') as ThemeRuntime
-    await vi.waitFor(() => { expect(b.describe).toHaveBeenCalledOnce() })
+    await vi.waitFor(() => { expect(b.describe).toHaveBeenCalledTimes(2) })
     expect(theme.getTheme().preference).toBe('system')
   })
 

tsconfig.host.json

@@ -13,6 +13,7 @@
     "apps/web/tests/declared-reasoning.e2e.ts",
     "apps/web/tests/support.ts",
     "apps/web/tests/scaffold-hermetic.e2e.ts",
+    "apps/web/tests/startup-rpc-budget.e2e.ts",
     "apps/web/tests/minimal-preset.snapshot.ts",
     "apps/web/tests/message-feedback-protocol.snapshot.ts",
     "apps/web/tests/live-interactions.e2e.ts",