Merge pull request #1120 from deepseek-harness/feat/pwsh-tool

feat(pwsh): add the pwsh-local executor and the pwsh tool

.agents/notes/implemented/feature/2026-08-01-pwsh-tool-and-executor.i18n.yaml

@@ -0,0 +1,6 @@
+# Bilingual-pair consistency record (docs/i18n/README.md): the git blob hash of each
+# side as of the last confirmed-consistent state. Both languages carry equal authority;
+# after editing either side, bring the other along and re-record with:
+#   pnpm run verify-translation-pairing --write .agents/notes/implemented/feature/2026-08-01-pwsh-tool-and-executor.md
+2026-08-01-pwsh-tool-and-executor.md: 7206f8ffe6640f8499f8453c40ab5846b23112c6
+2026-08-01-pwsh-tool-and-executor.zh.md: 5a48adb79fed209d2d2ecb9514fd51538491f04c

.agents/notes/implemented/feature/2026-08-01-pwsh-tool-and-executor.md

@@ -0,0 +1,35 @@
+# Agent Note: PowerShell executor and pwsh tool
+
+Status: implemented
+
+English | [中文](2026-08-01-pwsh-tool-and-executor.zh.md)
+
+## Problem
+
+The harness spoke one shell dialect on every platform: `bash`. Windows hosts could run it only through WSL or Git-Bash shims, and the shipped `dsh-bash-local` executor is POSIX-only (`bash` hardcoded, process-group semantics POSIX). The Windows roadmap — defaulting hosts to `pwsh`, later pwsh TUI/GUI rendering — had no execution foundation: there was no PowerShell implementation of the bash executor seam and no model-facing tool that taught the PowerShell dialect. The bash tool itself is also far larger than a Windows-first profile needs: background tasks, sandbox escalation, and the persistent-PTY twin are all bash-shaped surface that a minimal `pwsh` tool should not carry.
+
+## Decision
+
+Two new packages under `packages/bash/`:
+
+- **`@deepseek-ai/dsh-pwsh-local`** — a local implementation of the `ctx.bash` executor seam over `ctx.subprocess`, mirroring `dsh-bash-local` call-for-call: `resolve()` defaults and caps from config, `run()` fuses the config-clamped timeout with the caller's signal through one deadline, `start()` returns a consuming background handle whose processes belong to the subprocess service. The command string rides as ONE argv element to `pwsh -NoLogo -NoProfile -NonInteractive -Command`, so PowerShell parses it and no shell-quoting layer exists. Executable resolution (`resolvePwshPath`) is a pure function of `(configured, env, platform)`: explicit config first, then Windows probes PowerShell 7's install, PATH entries (quotes stripped), and Windows PowerShell 5.1, else a bare `pwsh` via PATH.
+- **`@deepseek-ai/dsh-tool-pwsh`** — the model-facing tool over `ctx.bash`, PowerShell-dialect by contract, mirroring `dsh-tool-bash` call-for-call minus the sandbox surface: foreground and `run_in_background` execution through the generic task runtime, managed `DSH_*` environment through the shared [`dsh-bash-env`](../feature/2026-08-02-pwsh-tool-bash-parity.md) registry, and the bash marker/truncation rendering story (a clean exit produces no marker). The parity decision supersedes this note's minimal-profile tool description.
+
+Windows vitest coverage is deliberately NOT part of this change: the repo's Windows CI lane owns build/static gates, and unit coverage runs on Linux, where both packages' suites run against a real `pwsh` (preinstalled on the GitHub-hosted runners) or self-skip when absent. The vitest `windowsUnsupportedPackages` exclusion narrows from `packages/bash/*` to the bash-requiring packages so the pwsh suites can also run natively on Windows dev machines.
+
+The roadmap beyond this decision — defaulting Windows hosts to `pwsh` (bash off), and pwsh TUI/GUI rendering — is recorded separately as [a proposal](../../proposed/feature/2026-08-01-windows-pwsh-default.md).
+
+## Alternatives considered
+
+**Extend `dsh-bash-local` with a pwsh mode.** Rejected: the executor's identity is the shell it spawns; a second dialect inside one package doubles its config surface (`shell` switches) and its test matrix, and the two dialects' quirks (signal facts on Windows, quoting domains) belong to their own packages' documentation.
+
+**Extend `dsh-tool-bash` with a dialect parameter.** Rejected: the bash tool's background/sandbox surface is bash-shaped; a `pwsh` mode would either hide it (conditional schema churn) or inherit it (surface the minimal profile explicitly rejects). The minimal twin keeps the model contract honest.
+
+**Wire the pwsh tool into the shipped CLI compositions now.** Rejected: mounting `tool-pwsh` + `pwsh-local` in `base.cordis.yml` would change the shipped roster before the Windows-default decision lands; this change ships the capability and its wiring points (`apps/cli` dependencies, tsconfig projects) without switching any default.
+
+## Consequences
+
+- The bash executor seam gains a second, Windows-native implementation with an identical request/spec contract, so model-facing consumers beyond `tool-pwsh` (hooks bridges, in-process plugins) can run PowerShell without dialect shims.
+- `tool-pwsh` is the model-visible Windows-first shell tool: behaviorally interchangeable with the bash tool for foreground and background work (minus sandbox), with prompt guidance that states the marker contract precisely.
+- Windows semantics differ where the platform differs: forced termination reports exit 1 with no signal (so `signal`/`killed` status facts are POSIX-only), and PowerShell writes CRLF, which tests normalize.
+- The CLI gains two workspace dependencies and two tsconfig projects without mounting either plugin — the composition decision stays with the Windows-default proposal.

.agents/notes/implemented/feature/2026-08-01-pwsh-tool-and-executor.zh.md

@@ -0,0 +1,35 @@
+# Agent Note: PowerShell 执行器与 pwsh 工具
+
+Status: implemented
+
+[English](2026-08-01-pwsh-tool-and-executor.md) | 中文
+
+## 问题
+
+harness 在每个平台只说一种 shell 方言：`bash`。Windows 主机只能通过 WSL 或 Git-Bash 垫片运行它，而交付的 `dsh-bash-local` 执行器仅限 POSIX（硬编码 `bash`，进程组语义是 POSIX 的）。Windows 路线图——让主机默认 `pwsh`，之后再做 pwsh TUI/GUI 渲染——没有执行基础：既没有 bash 执行器 seam 的 PowerShell 实现，也没有教模型 PowerShell 方言的面向模型工具。bash 工具本身也远大于 Windows 优先画像所需：后台任务、沙箱升级与持久 PTY 孪生都是 bash 形状的表面，最小化的 `pwsh` 工具不该背负。
+
+## 决策
+
+在 `packages/bash/` 下新增两个包：
+
+- **`@deepseek-ai/dsh-pwsh-local`** —— `ctx.bash` 执行器 seam 的本地实现，基于 `ctx.subprocess`，逐调用镜像 `dsh-bash-local`：`resolve()` 从配置默认化并设上限，`run()` 通过一个 deadline 融合配置夹取的超时与调用方信号，`start()` 返回消费式后台句柄，其进程归属于 subprocess 服务。命令字符串作为 ONE argv 元素传给 `pwsh -NoLogo -NoProfile -NonInteractive -Command`，由 PowerShell 解析，不存在 shell 引号层。可执行文件解析（`resolvePwshPath`）是 `(configured, env, platform)` 的纯函数：先显式配置，再在 Windows 上探测 PowerShell 7 安装位置、PATH 条目（剥离引号）与 Windows PowerShell 5.1，否则经 PATH 解析裸 `pwsh`。
+- **`@deepseek-ai/dsh-tool-pwsh`** —— 基于 `ctx.bash` 的面向模型工具，契约是 PowerShell 方言，逐调用镜像 `dsh-tool-bash`、减去 sandbox 面：经通用任务运行时执行前台与 `run_in_background`，经共享 [`dsh-bash-env`](../feature/2026-08-02-pwsh-tool-bash-parity.md) 注册表管理 `DSH_*` 环境，以及 bash 的 marker/截断渲染故事（干净退出不产生 marker）。parity 决策取代了本 note 的最小画像工具描述。
+
+Windows vitest 覆盖率刻意不属本次改动：仓库的 Windows CI 通道负责构建/静态门禁，单元覆盖在 Linux 上运行，两个包的套件在那里以真实 `pwsh` 运行（GitHub 托管 runner 预装）或缺失时自行跳过。vitest 的 `windowsUnsupportedPackages` 排除从 `packages/bash/*` 收窄为真正需要 bash 的包，使 pwsh 套件也能在 Windows 开发机上原生运行。
+
+本决策之后的路线图——让 Windows 主机默认 `pwsh`（关闭 bash）与 pwsh TUI/GUI 渲染——另行记录为[提案](../../proposed/feature/2026-08-01-windows-pwsh-default.md)。
+
+## 备选方案
+
+**给 `dsh-bash-local` 增加 pwsh 模式。** 否决：执行器的身份就是它 spawn 的 shell；在一个包内塞第二种方言会翻倍配置面（`shell` 开关）与测试矩阵，且两种方言的怪癖（Windows 上的信号实情、引号域）应各自归入自己包的文档。
+
+**给 `dsh-tool-bash` 增加方言参数。** 否决：bash 工具的后台/沙箱表面是 bash 形状的；`pwsh` 模式要么隐藏它（条件 schema 翻动），要么继承它（把最小画像明确拒绝的表面带进来）。最小孪生让模型契约保持诚实。
+
+**现在就接入交付的 CLI 组合。** 否决：在 Windows 默认决策落地前把 `tool-pwsh` + `pwsh-local` 挂进 `base.cordis.yml` 会改变交付清单；本改动交付能力与接线点（`apps/cli` 依赖、tsconfig 工程），不切换任何默认。
+
+## 后果
+
+- bash 执行器 seam 有了第二个、Windows 原生的实现，请求/规范契约一致，因此 `tool-pwsh` 之外的面向模型消费方（hooks 桥、进程内插件）无需方言垫片即可运行 PowerShell。
+- `tool-pwsh` 是模型可见的 Windows 优先 shell 工具：在前台与后台工作（减 sandbox）上与 bash 工具行为可互换，提示词指导精确陈述 marker 契约。
+- Windows 语义在平台差异处不同：强制终止报告退出码 1 且无信号（因此 `signal`/`killed` 状态实情仅限 POSIX），PowerShell 输出 CRLF，测试做归一化。
+- CLI 增加两个 workspace 依赖与两个 tsconfig 工程，但不挂载任一插件——组合决策留给 Windows 默认提案。

.agents/notes/implemented/feature/2026-08-02-pwsh-tool-bash-parity.i18n.yaml

@@ -0,0 +1,6 @@
+# Bilingual-pair consistency record (docs/i18n/README.md): the git blob hash of each
+# side as of the last confirmed-consistent state. Both languages carry equal authority;
+# after editing either side, bring the other along and re-record with:
+#   pnpm run verify-translation-pairing --write .agents/notes/implemented/feature/2026-08-02-pwsh-tool-bash-parity.md
+2026-08-02-pwsh-tool-bash-parity.md: bf40c440b9f7f330412d8949f59c54d541152d45
+2026-08-02-pwsh-tool-bash-parity.zh.md: bc67dac29900eacf9e615e76fe947e3e642a3979

.agents/notes/implemented/feature/2026-08-02-pwsh-tool-bash-parity.md

@@ -0,0 +1,36 @@
+# Agent Note: pwsh tool bash parity
+
+Status: implemented
+
+English | [中文](2026-08-02-pwsh-tool-bash-parity.zh.md)
+
+## Problem
+
+The first Windows-native foundation shipped `dsh-tool-pwsh` as a deliberately minimal profile — foreground only (a fresh process per call; no persistent PTY session), no managed-environment parity beyond three hardcoded `DSH_*` keys, and a marker story ("always `[exit code: N]`") that diverged from the bash tool's rendering without being declared. Review of that change found the model-visible contract drifting from the implementation: the description promised spill-path reporting the renderer never performed, the README claimed exports that did not exist and rendering the tool did not do, and the tool's own tests pinned the lossy behavior. The minimal profile also left the `DSH_*` contributor seam duplicated-by-absence: plugins contributing environment facts to `ctx.bashEnv` had no effect on pwsh calls.
+
+## Decision
+
+`dsh-tool-pwsh` now mirrors `dsh-tool-bash` call-for-call, minus the sandbox surface, and its model-visible text describes exactly that behavior:
+
+- **Rendering adopts the bash story verbatim**: stdout, a marked `[stderr]` section, truncation notices with spill paths, `(no output)` for an empty body, and exit markers only for non-zero exits — a clean exit produces no marker. The description and the `tool:pwsh` prompt section state this precisely ("Non-zero exits are reported as `[exit code: N]` markers"), deliberately not copying the bash prompt's "every result" phrasing, which its own renderer contradicts.
+- **`run_in_background` is wired through the generic task runtime** exactly like the bash tool: preflight, owner registration, `task_output`/`task_kill` control, and the same outcome mapping. `pwsh-local`'s already-mirrored `start()` handle backs it.
+- **The `DSH_*` environment is shared, not duplicated**: `BashEnvRegistry` moved out of `dsh-tool-bash` into a new tool-independent `@deepseek-ai/dsh-bash-env` package (`ctx.bashEnv` + built-ins + the session-persistence contributor), and both shell tools inject it. Contributors apply to pwsh calls exactly as they do to bash calls, resolving the bash tool's `FIXME(bash-env-ownership)`.
+- **Windows reality is pinned where bash has no analog**: every command runs under a UTF-8 output preamble so the Windows PowerShell 5.1 fallback cannot garble non-ASCII output through the UTF-8-decoding collector, and the prompts teach that Windows forced termination settles as exit 1 without a signal marker.
+- **Out of scope, unchanged**: sandbox escalation (waits for a Windows-confining executor), persistent PTY shells (backends are Linux/macOS-only; ConPTY is roadmap work), and pwsh-specific TUI/GUI presentation (generic/terminal cards stay; a PowerShell-aware terminal card with an exit pill is roadmap work).
+
+## Alternatives considered
+
+**Keep the minimal profile and fix only the claims.** Rejected: the review's core finding was that text contracts copied from bash drift without the corresponding implementation; a minimal tool plus accurate claims still leaves pwsh calls without background execution, without contributor parity, and with a divergent marker story that must be re-justified forever.
+
+**Reject a mismatched executor dialect at load.** Attempted and reverted before merge: a `ShellDialect` marker (`bash` | `powershell`) on `BashExecutor`, with both shell tools throwing when the mounted executor speaks another shell. It forced every executor implementation — including each test and example fake — to declare a dialect, adding noise to every shell-tool test for a guard with no in-repo or plausible deployment to catch (shipped compositions always pair tool-pwsh with `dsh-pwsh-local` and tool-bash with `dsh-bash-local`). The pairing contract stays documented in each tool's README instead.
+
+**Extract a fully shared tool implementation base (abstract shell dialect, two thin leaves).** Considered and deferred: the bash-env extraction and the structural mirror (`render.ts`/`background.ts` twins) are the foundation it would rest on; a full base waits until a third dialect or the persistent-PTY twin makes the abstraction's shape observable.
+
+## Consequences
+
+- The bash and pwsh tools are now behaviorally interchangeable for foreground and background shell work (minus sandbox), and the pwsh prompt/description sentences are each backed by the renderer — the reviewer's grep-against-code check passes.
+- Parity ran BOTH ways once: the pwsh tool's structured foreground abort (`HarnessError('tool call aborted', TOOL_ABORTED)` with name `AbortError`) was backported to the bash tool, replacing its uncoded `Error('command aborted')` — a model-visible/logged change pinned by exact-shape tests on both sides and by the cancel-tool-calls fixture.
+- `@deepseek-ai/dsh-bash-env` is a new shipped package; `dsh-tool-bash`'s `dshHome` config moved there, so compositions mounting the shell tools must also mount `bash-env` (the spine bundles do).
+- Windows-only semantics (CRLF normalization, forced-termination exit-1/signal-null, POSIX-only self-signal) remain pinned by tests as before.
+- The pwsh tool's per-file coverage gate rides on the scriptable fake-executor suite (`tests/tools.spec.ts`); the real-pwsh integration and Loader-composition suites self-skip where `pwsh` is absent, mirroring the bash suites' division of labor.
+- The roadmap proposal's parity stage is delivered; its remaining stages are the Windows default composition and pwsh TUI/GUI rendering.

.agents/notes/implemented/feature/2026-08-02-pwsh-tool-bash-parity.zh.md

@@ -0,0 +1,36 @@
+# Agent Note: pwsh 工具与 bash 对齐
+
+Status: implemented
+
+[English](2026-08-02-pwsh-tool-bash-parity.md) | 中文
+
+## 问题
+
+首个 Windows 原生基础交付的 `dsh-tool-pwsh` 是刻意最小的画像——仅前台、无后台任务、受管环境只有三个硬编码 `DSH_*` 键、以及一个未声明就偏离 bash 工具的 marker 故事（"恒打 `[exit code: N]`"）。对该变更的 review 发现模型可见契约与实现脱节：描述承诺了渲染器从未执行的 spill 路径报告，README 宣称了不存在的导出与工具未做的渲染，工具自己的测试还钉死了有损行为。最小画像还让 `DSH_*` contributor seam 因缺席而重复：向 `ctx.bashEnv` 贡献环境事实的插件对 pwsh 调用毫无作用。
+
+## 决策
+
+`dsh-tool-pwsh` 现在逐调用镜像 `dsh-tool-bash`，减去 sandbox 面，其模型可见文本精确描述这一行为：
+
+- **渲染完全采用 bash 故事**：stdout、带标记的 `[stderr]` 段、带 spill 路径的截断通知、空体渲染 `(no output)`、退出 marker 仅限非零退出——干净退出不产生 marker。描述与 `tool:pwsh` prompt section 精确陈述这一点（"Non-zero exits are reported as `[exit code: N]` markers"），刻意不复制 bash prompt 中与其自身渲染矛盾的 "every result" 措辞。
+- **`run_in_background` 经通用任务运行时接线**，与 bash 工具完全一致：预检、owner 注册、`task_output`/`task_kill` 控制与相同的结果映射。其背后是 `pwsh-local` 早已镜像好的 `start()` 句柄。
+- **`DSH_*` 环境共享而非复制**：`BashEnvRegistry` 从 `dsh-tool-bash` 迁入新的工具无关包 `@deepseek-ai/dsh-bash-env`（`ctx.bashEnv` + 内置事实 + session-persistence contributor），两个 shell 工具都注入它。contributor 对 pwsh 调用与 bash 调用一视同仁，并消化了 bash 工具的 `FIXME(bash-env-ownership)`。
+- **Windows 现实在 bash 无对应处钉死**：每条命令都在 UTF-8 输出 preamble 下运行，使 Windows PowerShell 5.1 兜底无法经 UTF-8 解码的 collector 破坏非 ASCII 输出；prompt 教授 Windows 强制终止以无 signal 的 exit 1 结算。
+- **范围外，不变**：sandbox 升级（等待 Windows-confining 执行器）、持久 PTY shell（后端仅限 Linux/macOS；ConPTY 属路线图）、pwsh 专属 TUI/GUI 呈现（维持 generic/terminal 卡；带退出 pill 的 PowerShell 感知 terminal 卡属路线图）。
+
+## 备选方案
+
+**保留最小画像，只修声明。** 否决：review 的核心发现是"从 bash 复制的文本契约在缺少对应实现时会漂移"；最小工具加准确声明仍让 pwsh 调用没有后台执行、没有 contributor 对等、并留下一个必须永远重新辩护的偏离 marker 故事。
+
+**在加载时拒绝不匹配的执行器方言。** 合并前尝试过并撤回：在 `BashExecutor` 上加 `ShellDialect` 标记（`bash` | `powershell`），两个 shell 工具在挂载的执行器说另一种方言时抛错。它迫使每个执行器实现——包括每个测试与示例的 fake——都要声明 dialect，为一道仓内及合理部署中都没有目标可拦的护栏（交付组合总是把 tool-pwsh 配 `dsh-pwsh-local`、tool-bash 配 `dsh-bash-local`）给每个 shell 工具测试添噪。配对契约改由各工具 README 记录。
+
+**提取完全共享的工具实现基座（抽象 shell 方言，两个薄叶子）。** 考虑后推迟：bash-env 提取与结构镜像（`render.ts`/`background.ts` 孪生）是它要立足的基础；在出现第三种方言或持久 PTY 孪生、让抽象的形态可观察之前，不做完整基座。
+
+## 后果
+
+- bash 与 pwsh 工具在前台与后台 shell 工作（减 sandbox）上行为可互换，pwsh 的 prompt/描述句每句都有渲染器背书——reviewer 的“拿代码 grep 对证”检查通过。
+- 对齐也反向发生过一次：pwsh 工具的结构化前台中止（`HarnessError('tool call aborted', TOOL_ABORTED)`，name 为 `AbortError`）被回移到 bash 工具，取代其无码的 `Error('command aborted')`——这是模型可见/入日志的变更，由两侧的精确形状测试与 cancel-tool-calls fixture 钉住。
+- `@deepseek-ai/dsh-bash-env` 成为新的交付包；`dsh-tool-bash` 的 `dshHome` 配置迁往那里，因此挂载 shell 工具的组合也必须挂载 `bash-env`（spine bundle 已如此）。
+- Windows 专属语义（CRLF 归一化、强制终止 exit-1/signal-null、仅 POSIX 的自信号）一如既往由测试钉住。
+- pwsh 工具的 per-file 覆盖门禁由可脚本化的 fake-executor 套件（`tests/tools.spec.ts`）承担；真实 pwsh 的集成与 Loader 组合套件在无 `pwsh` 的宿主自跳过，与 bash 套件的分工一致。
+- 路线图提案的 parity 阶段已交付；其余阶段是 Windows 默认组合与 pwsh TUI/GUI 渲染。

.agents/notes/proposed/feature/2026-08-01-windows-pwsh-default.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/proposed/feature/2026-08-01-windows-pwsh-default.md
+2026-08-01-windows-pwsh-default.md: a310174b6864bb880070280835ccfd8623e26342
+2026-08-01-windows-pwsh-default.zh.md: 079c1e3cac789a5e3fa4d0bb889026b3fb69f78c

.agents/notes/proposed/feature/2026-08-01-windows-pwsh-default.md

@@ -0,0 +1,39 @@
+# Agent Note: Windows defaults to pwsh (roadmap)
+
+Status: proposed
+
+English | [中文](2026-08-01-windows-pwsh-default.zh.md)
+
+## Problem
+
+The harness's shipped execution profile is bash-first on every platform. Windows hosts must install a bash shim (WSL or Git-Bash) or fall back to the POSIX-only `dsh-bash-local` behavior; the model-facing bash tool teaches the bash dialect, and the TUI/Web surfaces render terminal output in bash-shaped expectations. The first Windows-native foundation shipped in the [pwsh executor and tool decision](../../implemented/feature/2026-08-01-pwsh-tool-and-executor.md): a PowerShell implementation of the `ctx.bash` seam and a parity `pwsh` tool — but nothing yet defaults Windows hosts to them.
+
+## Proposal
+
+Two follow-up stages, each independently shippable. The former stage 2 (bash-tool parity twin) shipped with the [pwsh tool bash parity decision](../../implemented/feature/2026-08-02-pwsh-tool-bash-parity.md): `tool-pwsh` now mirrors `tool-bash` for foreground and background work minus the sandbox surface, shares the `DSH_*` environment through `dsh-bash-env`, and carries a keyless application snapshot of its assembled surface.
+
+1. **Windows default composition** — the shipped CLI compositions mount `dsh-pwsh-local` as the `ctx.bash` executor and `dsh-tool-pwsh` as the model-facing shell tool on Windows hosts (bash unmounted there), while POSIX hosts keep the bash stack. This is a composition/roster decision in `base.cordis.yml` and the surface overlays, gated by platform; it makes the shipped Windows experience PowerShell-native end to end.
+2. **pwsh TUI/GUI rendering** — the TUI and Web surfaces render pwsh output with PowerShell-aware presentation (native path display, `$env:` facts), the counterpart of the bash terminal cards. This is where terminal/console rendering conventions get a PowerShell twin.
+
+The stages are deliberately sequenced: composition first (a Windows user gets PowerShell without choosing), then rendering. Nothing in this proposal changes POSIX behavior.
+
+## Alternatives considered
+
+**Default Windows to pwsh inside `dsh-bash-local` (one executor, dialect switch).** Rejected for the same reason the executor decision rejected a mode switch: the executor's identity is the shell it spawns, and platform-gated composition is a deployment choice, not an executor config.
+
+**Ship the Windows default in the same change as the executor/tool.** Rejected: the roster change needs its own evidence (what breaks when the shipped Windows tree stops mounting bash, which tools depend on bash semantics), and it belongs to a composition decision with the approval/PTY surface visible.
+
+**Keep bash on Windows via a shim and skip PowerShell defaults.** Rejected: it perpetuates the install-tax and the dialect mismatch the roadmap exists to remove; the shim is a deployment requirement, not a product behavior.
+
+## Acceptance criteria
+
+- A Windows host running the shipped `dsh` TUI/Web gets `pwsh` as its shell tool and PowerShell as the `ctx.bash` executor without configuration, and `bash` is absent from the model-visible roster there.
+- POSIX hosts are byte-for-byte unaffected (same roster, same executor).
+- The shipped-composition e2es assert the platform-gated roster on both families.
+- Stage 1 lands with the keyless pwsh-tool snapshot already in place from the parity change; stage 2 lands with TUI/Web rendering snapshots for pwsh output.
+
+## Risks
+
+- **Bash-dependent composition rows** — any shipped plugin that assumes `bash` semantics (hook bridges executing shell hooks, workspace tooling) must be audited per stage; the audit may force a staged rollout rather than one switch.
+- **Windows CI coverage gap** — unit coverage runs on Linux; Windows-only regressions in the pwsh stack surface through the Windows build/static lane and e2es, which must be extended per stage rather than assumed.
+- **Rendering conventions** — a PowerShell twin for terminal cards is a UI design decision with snapshot surface; deferring it (stage 2) keeps stage 1 shippable without UI churn.

.agents/notes/proposed/feature/2026-08-01-windows-pwsh-default.zh.md

@@ -0,0 +1,39 @@
+# Agent Note: Windows 默认改用 pwsh（路线图）
+
+Status: proposed
+
+[English](2026-08-01-windows-pwsh-default.md) | 中文
+
+## 问题
+
+harness 交付的执行画像在每个平台都是 bash 优先。Windows 主机必须安装 bash 垫片（WSL 或 Git-Bash），或退回到仅 POSIX 的 `dsh-bash-local` 行为；面向模型的 bash 工具教的是 bash 方言，TUI/Web 表面以 bash 形状的预期渲染终端输出。第一块 Windows 原生基础已随 [pwsh 执行器与工具决策](../../implemented/feature/2026-08-01-pwsh-tool-and-executor.md) 交付：`ctx.bash` seam 的 PowerShell 实现与对等的 `pwsh` 工具——但还没有任何东西让 Windows 主机默认使用它们。
+
+## 提案
+
+两个阶段，各自可独立交付。原阶段 2（bash 工具对等孪生）已随 [pwsh 工具与 bash 对齐决策](../../implemented/feature/2026-08-02-pwsh-tool-bash-parity.md) 交付：`tool-pwsh` 现在在前台与后台工作（减 sandbox 面）上镜像 `tool-bash`，通过 `dsh-bash-env` 共享 `DSH_*` 环境，并携带其组装表面的 keyless 应用快照。
+
+1. **Windows 默认组合**——交付的 CLI 组合在 Windows 主机上挂载 `dsh-pwsh-local` 作为 `ctx.bash` 执行器、`dsh-tool-pwsh` 作为面向模型的 shell 工具（那里不挂载 bash），POSIX 主机保持 bash 栈。这是 `base.cordis.yml` 与 surface 覆盖层里按平台门控的组合/清单决策；它让交付的 Windows 体验端到端 PowerShell 原生。
+2. **pwsh TUI/GUI 渲染**——TUI 与 Web 表面以 PowerShell 感知的呈现渲染 pwsh 输出（原生路径显示、`$env:` 实情），即 bash 终端卡片的对应物。这是终端/控制台渲染约定获得 PowerShell 孪生的地方。
+
+各阶段刻意排序：先组合（Windows 用户无需选择即获得 PowerShell），再渲染。本提案不改变任何 POSIX 行为。
+
+## 备选方案
+
+**在 `dsh-bash-local` 内部让 Windows 默认 pwsh（一个执行器，方言开关）。** 否决，理由与执行器决策否决模式开关相同：执行器的身份就是它 spawn 的 shell，而按平台门控的组合是部署选择，不是执行器配置。
+
+**把 Windows 默认与执行器/工具一起交付。** 否决：清单变更需要自己的证据（交付的 Windows 树停挂 bash 后什么会坏、哪些工具依赖 bash 语义），并且它属于带批准/PTY 表面可见的组合决策。
+
+**用垫片在 Windows 上保留 bash，跳过 PowerShell 默认。** 否决：这延续了安装税与路线图要消除的方言错配；垫片是部署要求，不是产品行为。
+
+## 验收标准
+
+- 运行交付版 `dsh` TUI/Web 的 Windows 主机无需配置即获得 `pwsh` 作为其 shell 工具、PowerShell 作为 `ctx.bash` 执行器，且那里的模型可见清单中没有 `bash`。
+- POSIX 主机逐字节不受影响（清单相同，执行器相同）。
+- 交付组合 e2e 在两个平台族上断言按平台门控的清单。
+- 阶段 1 落地时，parity 变更带来的 keyless pwsh 工具快照已经就位；阶段 2 附带 pwsh 输出的 TUI/Web 渲染快照落地。
+
+## 风险
+
+- **依赖 bash 的组合行**——任何假设 bash 语义的交付插件（执行 shell hooks 的 hooks 桥、工作区工具）必须按阶段审计；审计可能迫使分阶段推出而非一次切换。
+- **Windows CI 覆盖缺口**——单元覆盖在 Linux 上运行；pwsh 栈里仅 Windows 的回归通过 Windows 构建/静态通道与 e2e 浮出，必须按阶段扩展而不是想当然。
+- **渲染约定**——终端卡片的 PowerShell 孪生是带快照表面的 UI 设计决策；把它延期（阶段 2）让阶段 1 无需 UI 翻动即可交付。

AGENTS.md

@@ -14,7 +14,7 @@ packages/    @deepseek-ai/dsh-<pkg> workspaces at packages/<group>/<pkg>/
   core/        product API spine: session, system-prompt, tools, agent, agent-loop
   typert/      type graph generator, loader, and runtime registry
   llm/         LLM seam + DeepSeek adapters (direct-fetch + pi-ai design twin)
-  bash/        bash executor seam + local impl + model-facing bash tools
+  bash/        bash executor seam + local/pwsh impls + model-facing shell tools
   subprocess/  subprocess seam + local process-tree impl
   pty/         persistent PTY seam/backend/tools
   fs/          filesystem seam + local impl + policy gate + read/write/edit tools

apps/cli/composition.md

@@ -54,6 +54,8 @@ flowchart LR
   cfg --> plugin_dsh_base_approval
   plugin_dsh_base_permission["permission<br/>@deepseek-ai/dsh-permission"]
   cfg --> plugin_dsh_base_permission
+  plugin_dsh_base_bash_env["bash-env<br/>@deepseek-ai/dsh-bash-env"]
+  cfg --> plugin_dsh_base_bash_env
   plugin_dsh_base_tool_bash["tool-bash<br/>@deepseek-ai/dsh-tool-bash"]
   cfg --> plugin_dsh_base_tool_bash
   plugin_dsh_base_tool_tasks["tool-tasks<br/>@deepseek-ai/dsh-tool-tasks"]
@@ -171,6 +173,7 @@ flowchart LR
 | `bash-sandbox` | `@deepseek-ai/dsh-bash-sandbox` |
 | `approval` | `@deepseek-ai/dsh-user-approval` |
 | `permission` | `@deepseek-ai/dsh-permission` |
+| `bash-env` | `@deepseek-ai/dsh-bash-env` |
 | `tool-bash` | `@deepseek-ai/dsh-tool-bash` |
 | `tool-tasks` | `@deepseek-ai/dsh-tool-tasks` |
 | `fs-policy` | `@deepseek-ai/dsh-fs-policy` |

apps/cli/config/base.cordis.yml

@@ -173,6 +173,9 @@
         sandbox: danger-full-access
         approval: never
 
+- id: bash-env
+  name: '@deepseek-ai/dsh-bash-env'
+
 - id: tool-bash
   name: '@deepseek-ai/dsh-tool-bash'
 

apps/cli/package.json

@@ -22,6 +22,7 @@
     "@deepseek-ai/dsh-agent-loop": "workspace:^",
     "@deepseek-ai/dsh-app-boot": "workspace:^",
     "@deepseek-ai/dsh-bash-local": "workspace:^",
+    "@deepseek-ai/dsh-bash-env": "workspace:^",
     "@deepseek-ai/dsh-bash-sandbox": "workspace:^",
     "@deepseek-ai/dsh-client-connection": "workspace:^",
     "@deepseek-ai/dsh-client-hmr": "workspace:^",
@@ -75,6 +76,7 @@
     "@deepseek-ai/dsh-repeat-tool-guard": "workspace:^",
     "@deepseek-ai/dsh-pty": "workspace:^",
     "@deepseek-ai/dsh-pty-local": "workspace:^",
+    "@deepseek-ai/dsh-pwsh-local": "workspace:^",
     "@deepseek-ai/dsh-repository-plugin": "workspace:^",
     "@deepseek-ai/dsh-sandbox-local": "workspace:^",
     "@deepseek-ai/dsh-sandbox-policy": "workspace:^",
@@ -115,6 +117,7 @@
     "@deepseek-ai/dsh-tool-skill": "workspace:^",
     "@deepseek-ai/dsh-tool-str-replace-editor": "workspace:^",
     "@deepseek-ai/dsh-tool-subagent": "workspace:^",
+    "@deepseek-ai/dsh-tool-pwsh": "workspace:^",
     "@deepseek-ai/dsh-tool-subagent-control": "workspace:^",
     "@deepseek-ai/dsh-tool-subagent-report": "workspace:^",
     "@deepseek-ai/dsh-tool-tasks": "workspace:^",

apps/cli/src/web.ts

@@ -11,7 +11,7 @@ import type { Context } from 'cordis'
 import { addHarnessSourceSection, resolveConfigPath } from '@deepseek-ai/dsh-app-boot'
 import type {} from '@deepseek-ai/dsh-host-webserver'
 import type {} from '@deepseek-ai/dsh-system-prompt'
-import type {} from '@deepseek-ai/dsh-tool-bash'
+import type {} from '@deepseek-ai/dsh-bash-env'
 import { AppCLIEntry } from './app-cli-entry.ts'
 import { createProcessShutdown } from './process-shutdown.ts'
 

apps/cli/tsconfig.json

@@ -23,6 +23,9 @@
     {
       "path": "../../packages/ui/app-boot"
     },
+    {
+      "path": "../../packages/bash/bash-env"
+    },
     {
       "path": "../../packages/bash/tool-bash"
     },

apps/web/tests/bash-abort-row.e2e.ts

@@ -56,7 +56,7 @@ describe.skipIf(MODE === 'record')('web e2e: cancelled Bash row disclosure', ()
     const row = page.locator('[data-sample="bash"]').first()
     const call = row.locator('xpath=..')
     await expect.poll(() => row.getAttribute('aria-expanded')).toBe('false')
-    await expect.poll(() => call.getByText('Error: command aborted', { exact: true }).count()).toBe(1)
+    await expect.poll(() => call.getByText('Error: tool call aborted', { exact: true }).count()).toBe(1)
     await row.click()
 
     await expect.poll(() => row.getAttribute('aria-expanded')).toBe('true')
@@ -64,7 +64,7 @@ describe.skipIf(MODE === 'record')('web e2e: cancelled Bash row disclosure', ()
     await call.getByText('OUT', { exact: true }).waitFor()
     await call.getByText('Wait until cancellation', { exact: false }).waitFor()
     await call.getByText('setInterval(() => {}, 1000)', { exact: false }).waitFor()
-    await expect.poll(() => call.getByText('Error: command aborted', { exact: true }).count()).toBe(2)
+    await expect.poll(() => call.getByText('Error: tool call aborted', { exact: true }).count()).toBe(2)
 
     const snapshot = (await captureStableAria(page, '[class*="centerCol"]', scaffold.workspaceCwd))
       // The borrowed fixture's UTC date is still the previous day in PDT;

apps/web/tests/snapshots/bash-abort-row/ui.expected.md

@@ -14,10 +14,10 @@
   - img
   - img
   - text: Context injection
-- 'button "Failed Bash Error: command aborted" [expanded]':
+- 'button "Failed Bash Error: tool call aborted" [expanded]':
   - img
-  - text: "Failed Bash Error: command aborted"
-- text: "IN { \"command\": \"node -e \\\"require('node:fs').writeFileSync('started.txt', 'started'); setInterval(() => {}, 1000)\\\"\", \"description\": \"Wait until cancellation\" } OUT Error: command aborted"
+  - text: "Failed Bash Error: tool call aborted"
+- text: "IN { \"command\": \"node -e \\\"require('node:fs').writeFileSync('started.txt', 'started'); setInterval(() => {}, 1000)\\\"\", \"description\": \"Wait until cancellation\" } OUT Error: tool call aborted"
 - button "Inspect"
 - 'button "Failed Bash Error: tool call aborted before dispatch"':
   - img

docs/capability-seams.md

@@ -105,6 +105,9 @@ flowchart LR
   pkg_subagent_acp["subagent-acp"]
   pkg_bash["bash"]
   svc_bash["ctx.bash<br/>Bash executor seam"]
+  pkg_pwsh_local["pwsh-local"]
+  pkg_tool_pwsh["tool-pwsh"]
+  pkg_bash_env["bash-env"]
   svc_bashEnv["ctx.bashEnv<br/>Managed bash environment registry"]
   pkg_pty["pty"]
   svc_pty["ctx.pty<br/>Persistent PTY session registry"]
@@ -167,6 +170,7 @@ flowchart LR
   pkg_agent_loop --> svc_agentLoop
   pkg_approval --> svc_approval
   pkg_bash --> svc_bash
+  pkg_bash_env --> svc_bashEnv
   pkg_bash_local --> svc_bash
   pkg_bash_sandbox --> svc_bash
   pkg_code_runtime --> svc_codeRuntime
@@ -194,6 +198,7 @@ flowchart LR
   pkg_plan_mode --> svc_planMode
   pkg_pty --> svc_pty
   pkg_pty_local --> svc_pty
+  pkg_pwsh_local --> svc_bash
   pkg_sandbox --> svc_sandbox
   pkg_sandbox_local --> svc_sandbox
   pkg_sandbox_policy --> svc_sandboxPolicy
@@ -231,7 +236,6 @@ flowchart LR
   pkg_tasks --> svc_tasks
   pkg_tasks_local --> svc_tasks
   pkg_token_meter --> svc_tokenMeter
-  pkg_tool_bash --> svc_bashEnv
   pkg_tools --> svc_tools
   pkg_typert_registry --> svc_typert
   pkg_user_interaction --> svc_userInteraction
@@ -254,6 +258,9 @@ flowchart LR
   svc_bash --> pkg_hooks_claude
   svc_bash --> pkg_hooks_codex
   svc_bash --> pkg_tool_bash
+  svc_bash --> pkg_tool_pwsh
+  svc_bashEnv --> pkg_tool_bash
+  svc_bashEnv --> pkg_tool_pwsh
   svc_clientModuleHost --> pkg_hmr
   svc_codeRuntime --> pkg_tools
   svc_compact --> pkg_compact_basic
@@ -371,8 +378,8 @@ flowchart LR
 | `ctx.agentLoop` | `bundle` | [`agent-loop`](../packages/core/agent-loop) | - | [`agent-spine-demo`](../packages/examples/agent-spine-demo) | - | The one concrete loop plugin; extension packages depend on dsh-agent events and services, not on this package. |
 | `ctx.goals` | `core` | [`goal`](../packages/goal/goal) | - | - | - | Folds revisioned objective state from the session log and keeps live continuation activation process-local. |
 | `ctx.subprocess` | `seam` | [`subprocess`](../packages/subprocess/subprocess) | [`subprocess-local`](../packages/subprocess/subprocess-local) | [`bash-local`](../packages/bash/bash-local), [`bash-sandbox`](../packages/bash/bash-sandbox), [`lsp-local`](../packages/lsp/lsp-local), [`subagent-acp`](../packages/subagent/subagent-acp) | - | The bash executors, the LSP host, and the ACP subagent backend spawn their children through ctx.subprocess; the service owns tree lifetime, stdio dispositions (pipes, inherit, bounded spill-backed collection), and kill escalation. |
-| `ctx.bash` | `seam` | [`bash`](../packages/bash/bash) | [`bash-local`](../packages/bash/bash-local), [`bash-sandbox`](../packages/bash/bash-sandbox) | [`tool-bash`](../packages/bash/tool-bash), [`hooks-claude`](../packages/hooks/hooks-claude), [`hooks-codex`](../packages/hooks/hooks-codex) | - | The model-facing bash tools and hook bridges consume this seam; sandboxed or remote executors replace bash-local without touching them. |
-| `ctx.bashEnv` | `core` | [`tool-bash`](../packages/bash/tool-bash) | - | - | - | Plugins declare effect-scoped DSH_* facts; tool-bash collects one trusted snapshot per execution and the executor rebuilds the namespace. |
+| `ctx.bash` | `seam` | [`bash`](../packages/bash/bash) | [`bash-local`](../packages/bash/bash-local), [`bash-sandbox`](../packages/bash/bash-sandbox), [`pwsh-local`](../packages/bash/pwsh-local) | [`tool-bash`](../packages/bash/tool-bash), [`tool-pwsh`](../packages/bash/tool-pwsh), [`hooks-claude`](../packages/hooks/hooks-claude), [`hooks-codex`](../packages/hooks/hooks-codex) | - | The model-facing shell tools and hook bridges consume this seam; sandboxed, remote, or PowerShell executors replace bash-local without touching them. |
+| `ctx.bashEnv` | `core` | [`bash-env`](../packages/bash/bash-env) | - | [`tool-bash`](../packages/bash/tool-bash), [`tool-pwsh`](../packages/bash/tool-pwsh) | - | Plugins declare effect-scoped DSH_* facts; each shell tool collects one trusted snapshot per execution and its executor rebuilds the namespace. |
 | `ctx.pty` | `seam` | [`pty`](../packages/pty/pty) | [`pty-local`](../packages/pty/pty-local) | [`tool-pty`](../packages/pty/tool-pty) | - | The registry owns exact-Agent session identity and cleanup; backends own terminal mechanics, while tool-pty exposes the owner-scoped model surface. |
 | `ctx.sandbox` | `seam` | [`sandbox`](../packages/sandbox/sandbox) | [`sandbox-local`](../packages/sandbox/sandbox-local) | [`bash-sandbox`](../packages/bash/bash-sandbox), [`pty-local`](../packages/pty/pty-local) | - | Consumers hand over the exact argv they are about to spawn; same-world backends wrap it under a per-call policy and report enforcement. |
 | `ctx.sandboxPolicy` | `core` | [`sandbox-policy`](../packages/sandbox/sandbox-policy) | - | [`bash-sandbox`](../packages/bash/bash-sandbox), [`fs-sandbox`](../packages/fs/fs-sandbox), [`pty-local`](../packages/pty/pty-local) | - | The one home for the deployment default mode + workspace root; only the sandboxed executor and provider read the service (the tool layers use the pure `sandbox/mode` fold it also exports). Both enforcing families read it so bash and fs cannot confine to different roots. |

docs/config-catalog.md

@@ -192,7 +192,19 @@ export interface GoalConfig {
 
 Depends on: [`AgentLoopConfig`](#deepseek-aidsh-agent-loop) · [`GoalDomainConfig`](#deepseek-aidsh-goal) · [`InvariantConfig`](#deepseek-aidsh-invariants) · [`SessionTitleConfig`](#deepseek-aidsh-session-title) · [`SkillLocal`](../packages/skill/skill-local/src/index.ts) · [`SkillRegistryConfig`](#deepseek-aidsh-skill) · [`SystemPromptConfig`](#deepseek-aidsh-system-prompt) · [`toolBash`](../packages/bash/tool-bash/src/index.ts) · [`toolGoal`](../packages/goal/tool-goal/src/index.ts) · [`ToolsConfig`](#deepseek-aidsh-tools) · [`toolSkill`](../packages/skill/tool-skill/src/index.ts) · [`toolTasks`](../packages/tasks/tool-tasks/src/index.ts) · [`workspaceContext`](../packages/context/workspace-context/src/index.ts)
 
-Source: [`packages/examples/agent-spine-demo/src/index.ts:89`](../packages/examples/agent-spine-demo/src/index.ts)
+Source: [`packages/examples/agent-spine-demo/src/index.ts:90`](../packages/examples/agent-spine-demo/src/index.ts)
+
+## `@deepseek-ai/dsh-bash-env`
+
+```ts config-catalog
+/** Plugin config (all optional — the built-in facts resolve without defaults). */
+export interface Config {
+  /** DeepSeek Harness home directory exposed as `DSH_HOME`; defaults to `$DSH_HOME` or `~/.dsh`. */
+  dshHome?: string
+}
+```
+
+Source: [`packages/bash/bash-env/src/index.ts:29`](../packages/bash/bash-env/src/index.ts)
 
 ## `@deepseek-ai/dsh-bash-local`
 
@@ -963,6 +975,37 @@ export interface Config {
 
 Source: [`packages/pty/pty-local/src/config.ts:6`](../packages/pty/pty-local/src/config.ts)
 
+## `@deepseek-ai/dsh-pwsh-local`
+
+Requires: `subprocess`
+
+```ts config-catalog
+/** Plugin config (all optional — `static Config` supplies the defaults). */
+export interface Config {
+  /** Default working directory for commands (default: process.cwd()). */
+  cwd?: string
+  /** Default foreground timeout in milliseconds. */
+  timeoutMs?: number
+  /** Upper bound for per-call timeout overrides. */
+  maxTimeoutMs?: number
+  /** Per-stream in-memory output cap; overflow spills to a temp file. */
+  maxOutputBytes?: number
+  /** Per-stream spill-file cap; larger streams retain only their in-memory tail. */
+  maxSpillBytes?: number
+  /** Grace period for kill escalation and for inherited pipes after shell exit. */
+  graceMs?: number
+  /**
+   * Explicit pwsh executable. When omitted, well-known Windows install
+   * locations and PATH entries are probed in order (PowerShell 7 install,
+   * PATH entries such as the Microsoft Store install, then Windows
+   * PowerShell 5.1), falling back to a bare `pwsh` resolved through PATH.
+   */
+  pwshPath?: string
+}
+```
+
+Source: [`packages/bash/pwsh-local/src/index.ts:54`](../packages/bash/pwsh-local/src/index.ts)
+
 ## `@deepseek-ai/dsh-repeat-tool-guard`
 
 ```ts config-catalog
@@ -1663,19 +1706,17 @@ Source: [`packages/llm/token-meter/src/types.ts:12`](../packages/llm/token-meter
 
 ## `@deepseek-ai/dsh-tool-bash`
 
-Requires: `tools` · `bash` · `systemPrompt`
+Requires: `tools` · `bash` · `systemPrompt` · `bashEnv`
 
 ```ts config-catalog
-/** Configuration for the bash tool and its managed child environment. */
+/** Configuration for the bash tool. */
 export interface Config {
   /** Expose `run_in_background` (default true); disabled calls are also rejected. */
   enableRunInBackground?: boolean
-  /** DeepSeek Harness home directory exposed as `DSH_HOME`; defaults to `$DSH_HOME` or `~/.dsh`. */
-  dshHome?: string
 }
 ```
 
-Source: [`packages/bash/tool-bash/src/index.ts:41`](../packages/bash/tool-bash/src/index.ts)
+Source: [`packages/bash/tool-bash/src/index.ts:34`](../packages/bash/tool-bash/src/index.ts)
 
 ## `@deepseek-ai/dsh-tool-bash-persistent`
 
@@ -1813,6 +1854,20 @@ export interface Config {
 
 Source: [`packages/pty/tool-pty/src/index.ts:35`](../packages/pty/tool-pty/src/index.ts)
 
+## `@deepseek-ai/dsh-tool-pwsh`
+
+Requires: `tools` · `bash` · `systemPrompt` · `bashEnv`
+
+```ts config-catalog
+/** Configuration for the pwsh tool. */
+export interface Config {
+  /** Expose `run_in_background` (default true); disabled calls are also rejected. */
+  enableRunInBackground?: boolean
+}
+```
+
+Source: [`packages/bash/tool-pwsh/src/index.ts:41`](../packages/bash/tool-pwsh/src/index.ts)
+
 ## `@deepseek-ai/dsh-tool-ralph`
 
 Requires: `tools` · `workflows` · `subagents` · `systemPrompt`

docs/cordis-catalog/services.md

@@ -297,7 +297,7 @@ Source: [`packages/bash/bash/src/index.ts:51`](../../packages/bash/bash/src/inde
 
 ## `ctx.bashEnv` — `BashEnvRegistry`
 
-Registry (`ctx.bashEnv`) for trusted, per-execution `DSH_*` variables. The namespace is rebuilt for every model bash call: ambient `DSH_*` values are discarded by the executor, then the registry's current snapshot is injected. Built-in shell facts remain owned by the registry itself while plugins can register additional, enumerable facts with effect-scoped disposal.
+Registry (`ctx.bashEnv`) for trusted, per-execution `DSH_*` variables. The namespace is rebuilt for every model shell call: ambient `DSH_*` values are discarded by the executor, then the registry's current snapshot is injected. Built-in shell facts remain owned by the registry itself while plugins can register additional, enumerable facts with effect-scoped disposal.
 
 ```ts cordis-catalog
 /**
@@ -309,7 +309,7 @@ Registry (`ctx.bashEnv`) for trusted, per-execution `DSH_*` variables. The names
 register(contributor: BashEnvContributor): () => void
 
 /**
- * Build the trusted `DSH_*` snapshot for one bash tool execution.
+ * Build the trusted `DSH_*` snapshot for one shell tool execution.
  * @param execution - the current tool execution.
  * @returns an immutable environment overlay containing built-ins and current contributions.
  */
@@ -324,7 +324,7 @@ list(): BashEnvVariableInfo[]
 
 Types: [DshEnvironment](../core-data-structures/subprocess.md) · [ToolExecution](../core-data-structures/tools.md)
 
-Source: [`packages/bash/tool-bash/src/index.ts:104`](../../packages/bash/tool-bash/src/index.ts)
+Source: [`packages/bash/bash-env/src/index.ts:89`](../../packages/bash/bash-env/src/index.ts)
 
 ## `ctx.clientModuleHost` — `ClientModuleHostService`
 
@@ -2105,7 +2105,7 @@ abstract spawn(spec: SubprocessSpawnSpec): SubprocessHandle
 
 Types: [SubprocessHandle](../core-data-structures/subprocess.md) · [SubprocessSpawnSpec](../core-data-structures/subprocess.md)
 
-Source: [`packages/subprocess/subprocess/src/index.ts:88`](../../packages/subprocess/subprocess/src/index.ts)
+Source: [`packages/subprocess/subprocess/src/index.ts:91`](../../packages/subprocess/subprocess/src/index.ts)
 
 ## `ctx.systemPrompt` — `SystemPrompt`
 

docs/module-graph.md

@@ -38,9 +38,12 @@ flowchart TD
   end
   subgraph group_bash["packages/bash"]
     pkg_bash["bash"]
+    pkg_bash_env["bash-env"]
     pkg_bash_local["bash-local"]
     pkg_bash_sandbox["bash-sandbox"]
+    pkg_pwsh_local["pwsh-local"]
     pkg_tool_bash["tool-bash"]
+    pkg_tool_pwsh["tool-pwsh"]
   end
   subgraph group_fs["packages/fs"]
     pkg_fs["fs"]
@@ -503,6 +506,10 @@ flowchart TD
   pkg_bash_local --> pkg_invariants
   pkg_bash_local --> pkg_subprocess
   pkg_bash_local --> pkg_timeout
+  pkg_pwsh_local --> pkg_bash
+  pkg_pwsh_local --> pkg_invariants
+  pkg_pwsh_local --> pkg_subprocess
+  pkg_pwsh_local --> pkg_timeout
   pkg_fs_local --> pkg_fs
   pkg_fs_local --> pkg_invariants
   pkg_fs_policy --> pkg_fs
@@ -690,18 +697,11 @@ flowchart TD
   pkg_tool_goal --> pkg_session
   pkg_tool_goal --> pkg_system_prompt
   pkg_tool_goal --> pkg_tools
-  pkg_tool_bash --> pkg_agent
-  pkg_tool_bash --> pkg_bash
-  pkg_tool_bash --> pkg_invariants
-  pkg_tool_bash --> pkg_llm
-  pkg_tool_bash --> pkg_paths
-  pkg_tool_bash --> pkg_sandbox
-  pkg_tool_bash --> pkg_sandbox_policy
-  pkg_tool_bash --> pkg_session_persistence
-  pkg_tool_bash --> pkg_system_prompt
-  pkg_tool_bash --> pkg_tasks
-  pkg_tool_bash --> pkg_tools
-  pkg_tool_bash --> pkg_user_approval
+  pkg_bash_env --> pkg_bash
+  pkg_bash_env --> pkg_invariants
+  pkg_bash_env --> pkg_paths
+  pkg_bash_env --> pkg_session_persistence
+  pkg_bash_env --> pkg_tools
   pkg_tool_fs --> pkg_fs
   pkg_tool_fs --> pkg_invariants
   pkg_tool_fs --> pkg_llm
@@ -885,6 +885,25 @@ flowchart TD
   pkg_tool_workflow --> pkg_system_prompt
   pkg_tool_workflow --> pkg_tools
   pkg_tool_workflow --> pkg_workflow
+  pkg_tool_bash --> pkg_agent
+  pkg_tool_bash --> pkg_bash
+  pkg_tool_bash --> pkg_bash_env
+  pkg_tool_bash --> pkg_invariants
+  pkg_tool_bash --> pkg_llm
+  pkg_tool_bash --> pkg_sandbox
+  pkg_tool_bash --> pkg_sandbox_policy
+  pkg_tool_bash --> pkg_system_prompt
+  pkg_tool_bash --> pkg_tasks
+  pkg_tool_bash --> pkg_tools
+  pkg_tool_bash --> pkg_user_approval
+  pkg_tool_pwsh --> pkg_agent
+  pkg_tool_pwsh --> pkg_bash
+  pkg_tool_pwsh --> pkg_bash_env
+  pkg_tool_pwsh --> pkg_invariants
+  pkg_tool_pwsh --> pkg_llm
+  pkg_tool_pwsh --> pkg_system_prompt
+  pkg_tool_pwsh --> pkg_tasks
+  pkg_tool_pwsh --> pkg_tools
   pkg_subagent_acp --> pkg_agent
   pkg_subagent_acp --> pkg_invariants
   pkg_subagent_acp --> pkg_llm
@@ -964,27 +983,6 @@ flowchart TD
   pkg_client_ui_subagent --> pkg_invariants
   pkg_client_ui_subagent --> pkg_subagent
   pkg_client_ui_subagent --> pkg_token_meter
-  pkg_agent_spine_demo --> pkg_agent
-  pkg_agent_spine_demo --> pkg_agent_loop
-  pkg_agent_spine_demo --> pkg_goal
-  pkg_agent_spine_demo --> pkg_goal_session
-  pkg_agent_spine_demo --> pkg_invariants
-  pkg_agent_spine_demo --> pkg_llm
-  pkg_agent_spine_demo --> pkg_llm_retry
-  pkg_agent_spine_demo --> pkg_paths
-  pkg_agent_spine_demo --> pkg_scope
-  pkg_agent_spine_demo --> pkg_session
-  pkg_agent_spine_demo --> pkg_session_title
-  pkg_agent_spine_demo --> pkg_skill
-  pkg_agent_spine_demo --> pkg_skill_local
-  pkg_agent_spine_demo --> pkg_system_prompt
-  pkg_agent_spine_demo --> pkg_tasks_local
-  pkg_agent_spine_demo --> pkg_tool_bash
-  pkg_agent_spine_demo --> pkg_tool_goal
-  pkg_agent_spine_demo --> pkg_tool_skill
-  pkg_agent_spine_demo --> pkg_tool_tasks
-  pkg_agent_spine_demo --> pkg_tools
-  pkg_agent_spine_demo --> pkg_workspace_context
   pkg_sdk_protocol --> pkg_invariants
   pkg_sdk_protocol --> pkg_llm
   pkg_sdk_protocol --> pkg_session
@@ -1020,6 +1018,39 @@ flowchart TD
   pkg_jsonrpc --> pkg_sdk_protocol
   pkg_jsonrpc --> pkg_session
   pkg_jsonrpc --> pkg_subagent
+  pkg_agent_spine_demo --> pkg_agent
+  pkg_agent_spine_demo --> pkg_agent_loop
+  pkg_agent_spine_demo --> pkg_bash_env
+  pkg_agent_spine_demo --> pkg_goal
+  pkg_agent_spine_demo --> pkg_goal_session
+  pkg_agent_spine_demo --> pkg_invariants
+  pkg_agent_spine_demo --> pkg_llm
+  pkg_agent_spine_demo --> pkg_llm_retry
+  pkg_agent_spine_demo --> pkg_paths
+  pkg_agent_spine_demo --> pkg_scope
+  pkg_agent_spine_demo --> pkg_session
+  pkg_agent_spine_demo --> pkg_session_title
+  pkg_agent_spine_demo --> pkg_skill
+  pkg_agent_spine_demo --> pkg_skill_local
+  pkg_agent_spine_demo --> pkg_system_prompt
+  pkg_agent_spine_demo --> pkg_tasks_local
+  pkg_agent_spine_demo --> pkg_tool_bash
+  pkg_agent_spine_demo --> pkg_tool_goal
+  pkg_agent_spine_demo --> pkg_tool_skill
+  pkg_agent_spine_demo --> pkg_tool_tasks
+  pkg_agent_spine_demo --> pkg_tools
+  pkg_agent_spine_demo --> pkg_workspace_context
+  pkg_sdk_client --> pkg_invariants
+  pkg_sdk_client --> pkg_llm
+  pkg_sdk_client --> pkg_sdk_protocol
+  pkg_sdk_client --> pkg_session
+  pkg_subagent_dsh_sdk --> pkg_agent
+  pkg_subagent_dsh_sdk --> pkg_invariants
+  pkg_subagent_dsh_sdk --> pkg_llm
+  pkg_subagent_dsh_sdk --> pkg_sdk_client
+  pkg_subagent_dsh_sdk --> pkg_session
+  pkg_subagent_dsh_sdk --> pkg_subagent
+  pkg_subagent_dsh_sdk --> pkg_subprocess
   pkg_acp_demo --> pkg_acp
   pkg_acp_demo --> pkg_agent_spine_demo
   pkg_acp_demo --> pkg_app_boot
@@ -1040,17 +1071,6 @@ flowchart TD
   pkg_cli_demo --> pkg_session_persistence_jsonl
   pkg_cli_demo --> pkg_tools
   pkg_cli_demo --> pkg_workspace_context
-  pkg_sdk_client --> pkg_invariants
-  pkg_sdk_client --> pkg_llm
-  pkg_sdk_client --> pkg_sdk_protocol
-  pkg_sdk_client --> pkg_session
-  pkg_subagent_dsh_sdk --> pkg_agent
-  pkg_subagent_dsh_sdk --> pkg_invariants
-  pkg_subagent_dsh_sdk --> pkg_llm
-  pkg_subagent_dsh_sdk --> pkg_sdk_client
-  pkg_subagent_dsh_sdk --> pkg_session
-  pkg_subagent_dsh_sdk --> pkg_subagent
-  pkg_subagent_dsh_sdk --> pkg_subprocess
 ```
 
 | Package | Group | Depends on |
@@ -1139,6 +1159,7 @@ flowchart TD
 | [`token-meter`](../packages/llm/token-meter) | `llm` | [`invariants`](../packages/support/invariants), [`llm`](../packages/llm/llm), [`session`](../packages/core/session), [`session-projection`](../packages/session-projection/session-projection) |
 | [`goal`](../packages/goal/goal) | `goal` | [`agent`](../packages/core/agent), [`brand`](../packages/util/brand), [`invariants`](../packages/support/invariants), [`llm`](../packages/llm/llm), [`scope`](../packages/core/scope), [`session`](../packages/core/session), [`session-projection`](../packages/session-projection/session-projection) |
 | [`bash-local`](../packages/bash/bash-local) | `bash` | [`bash`](../packages/bash/bash), [`invariants`](../packages/support/invariants), [`subprocess`](../packages/subprocess/subprocess), [`timeout`](../packages/util/timeout) |
+| [`pwsh-local`](../packages/bash/pwsh-local) | `bash` | [`bash`](../packages/bash/bash), [`invariants`](../packages/support/invariants), [`subprocess`](../packages/subprocess/subprocess), [`timeout`](../packages/util/timeout) |
 | [`fs-local`](../packages/fs/fs-local) | `fs` | [`fs`](../packages/fs/fs), [`invariants`](../packages/support/invariants) |
 | [`fs-policy`](../packages/fs/fs-policy) | `fs` | [`fs`](../packages/fs/fs), [`invariants`](../packages/support/invariants) |
 | [`skill-local`](../packages/skill/skill-local) | `skill` | [`fs`](../packages/fs/fs), [`invariants`](../packages/support/invariants), [`paths`](../packages/util/paths), [`skill`](../packages/skill/skill) |
@@ -1179,7 +1200,7 @@ flowchart TD
 | [`session-telemetry-otel`](../packages/telemetry/session-telemetry-otel) | `telemetry` | [`brand`](../packages/util/brand), [`invariants`](../packages/support/invariants), [`llm`](../packages/llm/llm), [`paths`](../packages/util/paths), [`session`](../packages/core/session), [`session-telemetry`](../packages/telemetry/session-telemetry) |
 | [`agent-loop`](../packages/core/agent-loop) | `core` | [`agent`](../packages/core/agent), [`invariants`](../packages/support/invariants), [`llm`](../packages/llm/llm), [`scope`](../packages/core/scope), [`session`](../packages/core/session), [`session-persistence`](../packages/session-persistence/session-persistence), [`system-prompt`](../packages/core/system-prompt), [`tools`](../packages/core/tools) |
 | [`tool-goal`](../packages/goal/tool-goal) | `goal` | [`agent`](../packages/core/agent), [`goal`](../packages/goal/goal), [`invariants`](../packages/support/invariants), [`llm`](../packages/llm/llm), [`session`](../packages/core/session), [`system-prompt`](../packages/core/system-prompt), [`tools`](../packages/core/tools) |
-| [`tool-bash`](../packages/bash/tool-bash) | `bash` | [`agent`](../packages/core/agent), [`bash`](../packages/bash/bash), [`invariants`](../packages/support/invariants), [`llm`](../packages/llm/llm), [`paths`](../packages/util/paths), [`sandbox`](../packages/sandbox/sandbox), [`sandbox-policy`](../packages/sandbox/sandbox-policy), [`session-persistence`](../packages/session-persistence/session-persistence), [`system-prompt`](../packages/core/system-prompt), [`tasks`](../packages/tasks/tasks), [`tools`](../packages/core/tools), [`user-approval`](../packages/ui/user-approval) |
+| [`bash-env`](../packages/bash/bash-env) | `bash` | [`bash`](../packages/bash/bash), [`invariants`](../packages/support/invariants), [`paths`](../packages/util/paths), [`session-persistence`](../packages/session-persistence/session-persistence), [`tools`](../packages/core/tools) |
 | [`tool-fs`](../packages/fs/tool-fs) | `fs` | [`fs`](../packages/fs/fs), [`invariants`](../packages/support/invariants), [`llm`](../packages/llm/llm), [`sandbox`](../packages/sandbox/sandbox), [`sandbox-policy`](../packages/sandbox/sandbox-policy), [`session`](../packages/core/session), [`system-prompt`](../packages/core/system-prompt), [`tools`](../packages/core/tools), [`user-approval`](../packages/ui/user-approval) |
 | [`tool-fs-search`](../packages/fs/tool-fs-search) | `fs` | [`invariants`](../packages/support/invariants), [`llm`](../packages/llm/llm), [`retention`](../packages/util/retention), [`session`](../packages/core/session), [`spill`](../packages/spill/spill), [`subprocess`](../packages/subprocess/subprocess), [`system-prompt`](../packages/core/system-prompt), [`tools`](../packages/core/tools) |
 | [`tool-str-replace-editor`](../packages/fs/tool-str-replace-editor) | `fs` | [`fs`](../packages/fs/fs), [`invariants`](../packages/support/invariants), [`sandbox`](../packages/sandbox/sandbox), [`sandbox-policy`](../packages/sandbox/sandbox-policy), [`tools`](../packages/core/tools) |
@@ -1210,6 +1231,8 @@ flowchart TD
 | [`tool-pty`](../packages/pty/tool-pty) | `pty` | [`agent`](../packages/core/agent), [`invariants`](../packages/support/invariants), [`llm`](../packages/llm/llm), [`pty`](../packages/pty/pty), [`retention`](../packages/util/retention), [`system-prompt`](../packages/core/system-prompt), [`tasks`](../packages/tasks/tasks), [`tools`](../packages/core/tools) |
 | [`tool-tasks`](../packages/tasks/tool-tasks) | `tasks` | [`agent`](../packages/core/agent), [`invariants`](../packages/support/invariants), [`llm`](../packages/llm/llm), [`retention`](../packages/util/retention), [`system-prompt`](../packages/core/system-prompt), [`tasks`](../packages/tasks/tasks), [`tools`](../packages/core/tools) |
 | [`tool-workflow`](../packages/workflow/tool-workflow) | `workflow` | [`agent`](../packages/core/agent), [`invariants`](../packages/support/invariants), [`llm`](../packages/llm/llm), [`system-prompt`](../packages/core/system-prompt), [`tools`](../packages/core/tools), [`workflow`](../packages/workflow/workflow) |
+| [`tool-bash`](../packages/bash/tool-bash) | `bash` | [`agent`](../packages/core/agent), [`bash`](../packages/bash/bash), [`bash-env`](../packages/bash/bash-env), [`invariants`](../packages/support/invariants), [`llm`](../packages/llm/llm), [`sandbox`](../packages/sandbox/sandbox), [`sandbox-policy`](../packages/sandbox/sandbox-policy), [`system-prompt`](../packages/core/system-prompt), [`tasks`](../packages/tasks/tasks), [`tools`](../packages/core/tools), [`user-approval`](../packages/ui/user-approval) |
+| [`tool-pwsh`](../packages/bash/tool-pwsh) | `bash` | [`agent`](../packages/core/agent), [`bash`](../packages/bash/bash), [`bash-env`](../packages/bash/bash-env), [`invariants`](../packages/support/invariants), [`llm`](../packages/llm/llm), [`system-prompt`](../packages/core/system-prompt), [`tasks`](../packages/tasks/tasks), [`tools`](../packages/core/tools) |
 | [`subagent-acp`](../packages/subagent/subagent-acp) | `subagent` | [`agent`](../packages/core/agent), [`invariants`](../packages/support/invariants), [`llm`](../packages/llm/llm), [`session`](../packages/core/session), [`subagent`](../packages/subagent/subagent), [`subprocess`](../packages/subprocess/subprocess) |
 | [`subagent-inprocess`](../packages/subagent/subagent-inprocess) | `subagent` | [`agent`](../packages/core/agent), [`invariants`](../packages/support/invariants), [`llm`](../packages/llm/llm), [`sandbox-policy`](../packages/sandbox/sandbox-policy), [`session`](../packages/core/session), [`subagent`](../packages/subagent/subagent), [`system-prompt`](../packages/core/system-prompt), [`tools`](../packages/core/tools), [`user-approval`](../packages/ui/user-approval) |
 | [`tool-subagent`](../packages/subagent/tool-subagent) | `subagent` | [`agent`](../packages/core/agent), [`invariants`](../packages/support/invariants), [`llm`](../packages/llm/llm), [`subagent`](../packages/subagent/subagent), [`tasks`](../packages/tasks/tasks), [`tools`](../packages/core/tools) |
@@ -1221,14 +1244,14 @@ flowchart TD
 | [`client-ui-permission`](../packages/client/ui-permission) | `client` | [`client-connection`](../packages/client/connection), [`client-locale`](../packages/client/locale), [`client-runtime`](../packages/client/runtime), [`client-schema-form`](../packages/client/schema-form), [`client-ui-command`](../packages/client/ui-command), [`client-ui-primitives`](../packages/client/ui-primitives), [`client-ui-slash`](../packages/client/ui-slash), [`client-ui-slots`](../packages/client/ui-slots), [`invariants`](../packages/support/invariants), [`permission`](../packages/ui/permission) |
 | [`client-ui-plan`](../packages/client/ui-plan) | `client` | [`client-connection`](../packages/client/connection), [`client-locale`](../packages/client/locale), [`client-runtime`](../packages/client/runtime), [`client-ui-conversation`](../packages/client/ui-conversation), [`client-ui-primitives`](../packages/client/ui-primitives), [`client-ui-slots`](../packages/client/ui-slots), [`invariants`](../packages/support/invariants), [`plan-mode`](../packages/plan/plan-mode) |
 | [`client-ui-subagent`](../packages/client/ui-subagent) | `client` | [`client-locale`](../packages/client/locale), [`client-runtime`](../packages/client/runtime), [`client-ui-conversation`](../packages/client/ui-conversation), [`client-ui-primitives`](../packages/client/ui-primitives), [`client-ui-slash`](../packages/client/ui-slash), [`client-ui-slots`](../packages/client/ui-slots), [`invariants`](../packages/support/invariants), [`subagent`](../packages/subagent/subagent), [`token-meter`](../packages/llm/token-meter) |
-| [`agent-spine-demo`](../packages/examples/agent-spine-demo) | `examples` | [`agent`](../packages/core/agent), [`agent-loop`](../packages/core/agent-loop), [`goal`](../packages/goal/goal), [`goal-session`](../packages/goal/goal-session), [`invariants`](../packages/support/invariants), [`llm`](../packages/llm/llm), [`llm-retry`](../packages/llm/llm-retry), [`paths`](../packages/util/paths), [`scope`](../packages/core/scope), [`session`](../packages/core/session), [`session-title`](../packages/session-title/session-title), [`skill`](../packages/skill/skill), [`skill-local`](../packages/skill/skill-local), [`system-prompt`](../packages/core/system-prompt), [`tasks-local`](../packages/tasks/tasks-local), [`tool-bash`](../packages/bash/tool-bash), [`tool-goal`](../packages/goal/tool-goal), [`tool-skill`](../packages/skill/tool-skill), [`tool-tasks`](../packages/tasks/tool-tasks), [`tools`](../packages/core/tools), [`workspace-context`](../packages/context/workspace-context) |
 | [`sdk-protocol`](../packages/sdk/sdk-protocol) | `sdk` | [`invariants`](../packages/support/invariants), [`llm`](../packages/llm/llm), [`session`](../packages/core/session), [`subagent`](../packages/subagent/subagent) |
 | [`tool-ralph`](../packages/workflow/tool-ralph) | `workflow` | [`agent`](../packages/core/agent), [`invariants`](../packages/support/invariants), [`llm`](../packages/llm/llm), [`subagent`](../packages/subagent/subagent), [`system-prompt`](../packages/core/system-prompt), [`tools`](../packages/core/tools), [`workflow`](../packages/workflow/workflow) |
 | [`workflow-workerthread`](../packages/workflow/workflow-workerthread) | `workflow` | [`agent`](../packages/core/agent), [`brand`](../packages/util/brand), [`invariants`](../packages/support/invariants), [`llm`](../packages/llm/llm), [`session`](../packages/core/session), [`subagent`](../packages/subagent/subagent), [`tools`](../packages/core/tools), [`workflow`](../packages/workflow/workflow) |
 | [`subagent-fork`](../packages/subagent/subagent-fork) | `subagent` | [`agent`](../packages/core/agent), [`invariants`](../packages/support/invariants), [`session`](../packages/core/session), [`subagent`](../packages/subagent/subagent), [`subagent-inprocess`](../packages/subagent/subagent-inprocess) |
 | [`subagent-spawn`](../packages/subagent/subagent-spawn) | `subagent` | [`invariants`](../packages/support/invariants), [`subagent`](../packages/subagent/subagent), [`subagent-inprocess`](../packages/subagent/subagent-inprocess) |
 | [`jsonrpc`](../packages/ui/jsonrpc) | `ui` | [`agent`](../packages/core/agent), [`invariants`](../packages/support/invariants), [`llm`](../packages/llm/llm), [`llm-deepseek`](../packages/llm/llm-deepseek), [`scope`](../packages/core/scope), [`sdk-protocol`](../packages/sdk/sdk-protocol), [`session`](../packages/core/session), [`subagent`](../packages/subagent/subagent) |
-| [`acp-demo`](../packages/examples/acp-demo) | `examples` | [`acp`](../packages/acp/acp), [`agent-spine-demo`](../packages/examples/agent-spine-demo), [`app-boot`](../packages/ui/app-boot), [`invariants`](../packages/support/invariants), [`session-checkpoint-policy`](../packages/session-persistence/session-checkpoint-policy), [`session-persistence-jsonl`](../packages/session-persistence/session-persistence-jsonl), [`session-query`](../packages/session-query/session-query), [`session-query-sqlite`](../packages/session-query/session-query-sqlite), [`tools`](../packages/core/tools), [`workspace-context`](../packages/context/workspace-context) |
-| [`cli-demo`](../packages/examples/cli-demo) | `examples` | [`agent`](../packages/core/agent), [`agent-spine-demo`](../packages/examples/agent-spine-demo), [`app-boot`](../packages/ui/app-boot), [`invariants`](../packages/support/invariants), [`llm`](../packages/llm/llm), [`session`](../packages/core/session), [`session-checkpoint-policy`](../packages/session-persistence/session-checkpoint-policy), [`session-persistence-jsonl`](../packages/session-persistence/session-persistence-jsonl), [`tools`](../packages/core/tools), [`workspace-context`](../packages/context/workspace-context) |
+| [`agent-spine-demo`](../packages/examples/agent-spine-demo) | `examples` | [`agent`](../packages/core/agent), [`agent-loop`](../packages/core/agent-loop), [`bash-env`](../packages/bash/bash-env), [`goal`](../packages/goal/goal), [`goal-session`](../packages/goal/goal-session), [`invariants`](../packages/support/invariants), [`llm`](../packages/llm/llm), [`llm-retry`](../packages/llm/llm-retry), [`paths`](../packages/util/paths), [`scope`](../packages/core/scope), [`session`](../packages/core/session), [`session-title`](../packages/session-title/session-title), [`skill`](../packages/skill/skill), [`skill-local`](../packages/skill/skill-local), [`system-prompt`](../packages/core/system-prompt), [`tasks-local`](../packages/tasks/tasks-local), [`tool-bash`](../packages/bash/tool-bash), [`tool-goal`](../packages/goal/tool-goal), [`tool-skill`](../packages/skill/tool-skill), [`tool-tasks`](../packages/tasks/tool-tasks), [`tools`](../packages/core/tools), [`workspace-context`](../packages/context/workspace-context) |
 | [`sdk-client`](../packages/sdk/sdk-client) | `sdk` | [`invariants`](../packages/support/invariants), [`llm`](../packages/llm/llm), [`sdk-protocol`](../packages/sdk/sdk-protocol), [`session`](../packages/core/session) |
 | [`subagent-dsh-sdk`](../packages/subagent/subagent-dsh-sdk) | `subagent` | [`agent`](../packages/core/agent), [`invariants`](../packages/support/invariants), [`llm`](../packages/llm/llm), [`sdk-client`](../packages/sdk/sdk-client), [`session`](../packages/core/session), [`subagent`](../packages/subagent/subagent), [`subprocess`](../packages/subprocess/subprocess) |
+| [`acp-demo`](../packages/examples/acp-demo) | `examples` | [`acp`](../packages/acp/acp), [`agent-spine-demo`](../packages/examples/agent-spine-demo), [`app-boot`](../packages/ui/app-boot), [`invariants`](../packages/support/invariants), [`session-checkpoint-policy`](../packages/session-persistence/session-checkpoint-policy), [`session-persistence-jsonl`](../packages/session-persistence/session-persistence-jsonl), [`session-query`](../packages/session-query/session-query), [`session-query-sqlite`](../packages/session-query/session-query-sqlite), [`tools`](../packages/core/tools), [`workspace-context`](../packages/context/workspace-context) |
+| [`cli-demo`](../packages/examples/cli-demo) | `examples` | [`agent`](../packages/core/agent), [`agent-spine-demo`](../packages/examples/agent-spine-demo), [`app-boot`](../packages/ui/app-boot), [`invariants`](../packages/support/invariants), [`llm`](../packages/llm/llm), [`session`](../packages/core/session), [`session-checkpoint-policy`](../packages/session-persistence/session-checkpoint-policy), [`session-persistence-jsonl`](../packages/session-persistence/session-persistence-jsonl), [`tools`](../packages/core/tools), [`workspace-context`](../packages/context/workspace-context) |

docs/testing.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 docs/testing.md
-testing.md: 89d495e05c7521becea052ad67ac602ba28c22ef
-testing.zh.md: 8e19734d09d5b0bdbeffe9426bed7c12f23fbc41
+testing.md: 728c65f1911cbaa098f653af9436a92336fbe068
+testing.zh.md: 72b7c3bcfa69f4c65fc128dbcbb19c080fb0fbc4

docs/testing.md

@@ -7,9 +7,9 @@ How this repo tests, tier by tier, and the rules that keep a green suite meaning
 ## Tiers
 
 - **Unit** (`pnpm run test`): vitest over package and example specs under their `tests/**` directories plus repository script specs under `scripts/**/*.spec.ts`; tests stay with the code area they exercise. Every registry gets an HMR-safety test (dispose the contributing fiber, assert cleanup). Prefer edge cases, error paths, event ordering, concurrency races, and permanent contract regressions (see `packages/core/agent-loop/tests/contract-regressions.spec.ts`).
-- **Coverage gate** (`pnpm run test:coverage`): the gating run, per-file 100% on `packages/*/*/src`. An uncovered line is often dead code the gate is correctly flagging for deletion, not a missing test to bolt on. Line coverage is necessary, never sufficient — it proves lines ran, not that the feature works as shipped.
+- **Coverage gate** (`pnpm run test:coverage`): the gating run, per-file 100% on `packages/*/*/src`. An uncovered line is often dead code the gate is correctly flagging for deletion, not a missing test to bolt on. Line coverage is necessary, never sufficient — it proves lines ran, not that the feature works as shipped. Per-file 100% on `packages/bash/pwsh-local/src` needs a real `pwsh`: without one its executor suites self-skip and `vitest.config.ts` exempts the file so pwsh-less hosts stay green, while CI runners ship pwsh and enforce the full bar.
 - **Real-API e2e** (`pnpm run test:e2e`): with-key tests against live provider APIs — the DeepSeek model plus provider-specific smokes that gate on their own keys (`EXA_API_KEY`, `PERPLEXITY_API_KEY`, …); each suite self-skips without its key so keyless CI stays green ([real-API e2e Agent Note](../.agents/notes/implemented/testing/2026-06-19-real-api-e2e-ci.md)).
-- **Snapshot** (`pnpm run test:snapshot`): keyless expected outputs cover external behavior — transport contracts and presentation, while persisted logs pin assembled backend behavior. ACP boots the real automation-server example, replays a recorded session, and diffs normalized JSON-RPC plus the re-persisted log ([ACP snapshot Agent Note](../.agents/notes/implemented/testing/2026-06-19-acp-snapshot-tests.md)); headless pins `stream-json` through its real one-shot process. Use `pnpm run test:snapshot:record` when a model transcript changes and `pnpm run test:snapshot:refresh` when replay input remains valid; review every JSONL and expected-output diff. One ACP scenario (`text-turn`) pins full system-prompt/tool-schema content; other fixtures tokenize it so an edit churns one line ([pinned-header Agent Note](../.agents/notes/archived/testing/2026-07-06-pin-request-header-content-in-one-scenario.md)).
+- **Snapshot** (`pnpm run test:snapshot`): keyless expected outputs cover external behavior — transport contracts and presentation, while persisted logs pin assembled backend behavior. ACP boots the real automation-server example, replays a recorded session, and diffs normalized JSON-RPC plus the re-persisted log ([ACP snapshot Agent Note](../.agents/notes/implemented/testing/2026-06-19-acp-snapshot-tests.md)); headless pins `stream-json` through its real one-shot process. TUI journeys replay primary/child JSONL through the real loop and tools, then project ANSI into semantic terminal-state outputs; package snapshots retain transient states and a real PTY covers the process boundary ([TUI snapshot Agent Note](../.agents/notes/archived/testing/2026-07-18-tui-terminal-state-snapshots.md)). Use `pnpm run test:snapshot:record` when a model transcript changes and `pnpm run test:snapshot:refresh` when replay input remains valid; review every JSONL and expected-output diff. One ACP scenario (`text-turn`) pins full system-prompt/tool-schema content; other fixtures tokenize it so an edit churns one line ([pinned-header Agent Note](../.agents/notes/archived/testing/2026-07-06-pin-request-header-content-in-one-scenario.md)).
 - **Web browser snapshot** (`pnpm run test:web`; required Linux PR gate): Chromium compares replayed browser output with `apps/web/tests/snapshots/`. CI forces read-only `DSH_SNAPSHOT=replay`, never writing expected outputs; record/refresh stay local and every diff is reviewed ([web e2e lane](../.agents/notes/implemented/testing/2026-07-24-web-gui-browser-e2e-lane.md), [CI gate decision](../.agents/notes/implemented/testing/2026-07-30-web-browser-snapshot-ci-gate.md)). `test:web` [builds first](../.agents/notes/implemented/bug-fix/2026-07-28-themed-scrollbars-and-reserved-gutter.md) for plugin CSS.
 
 Committed session-format JSONL uses the canonical packed-row layout, and the keyless snapshot gate discovers every such fixture by its `session` header. In-flight branches carrying older fixture edits merge current `master` and run the [temporary migrator](../scripts/migrate-packed-session-fixtures.ts) through `pnpm run migrate:packed-session-fixtures`; the [removal proposal](../.agents/notes/proposed/process/2026-07-26-remove-packed-session-fixture-migrator.md) retires that command and these links after all affected branches converge.
@@ -46,4 +46,4 @@ An e2e assertion re-runs the command or re-reads the file externally; a keyword
 
 ## When a snapshot test is required
 
-Every non-trivial model-, protocol-, or human-visible change adds or updates a keyless scenario in the same PR through a runnable example's owning snapshot suite. Package tests, e2e assertions, mock/test-only compositions, and PR rationale do not replace the assembled transcript; extend the harness when needed. ACP automation scenarios use `examples/<name>/tests/snapshots/`, a scenario table over the [`dsh-acp-snapshot`](../packages/support/acp-snapshot/README.md) suite factory (`examples/acp-agent` is primary); `examples/headless-agent` owns the `stream-json` snapshot and replay fixtures. Browser-rendered web GUI journeys use `apps/web/tests/snapshots/`. New capability seams, lifecycle shapes, or transcript surfaces name every coverage tier at plan time and verify the harness can express it before implementation.
+Every non-trivial model-, protocol-, or human-visible change adds or updates a keyless scenario in the same PR through a runnable example's owning snapshot suite. Package tests, e2e assertions, mock/test-only compositions, and PR rationale do not replace the assembled transcript; extend the harness when needed. ACP automation scenarios use `examples/<name>/tests/snapshots/`, a scenario table over the [`dsh-acp-snapshot`](../packages/support/acp-snapshot/README.md) suite factory (`examples/acp-agent` is primary); `examples/headless-agent` owns the `stream-json` snapshot and replay fixtures. The `pwsh-tool-turn` ACP scenario boots real `pwsh` and skips where it is absent. Completed interactive-terminal journeys use JSONL-driven scenarios under `apps/cli/tests/snapshots/`; transient presentation uses the package-local semantic matrix, with a PTY case when input, Loader selection, or terminal teardown changes. Browser-rendered web GUI journeys use `apps/web/tests/snapshots/`. New capability seams, lifecycle shapes, or transcript surfaces name every coverage tier at plan time and verify the harness can express it before implementation.

docs/testing.zh.md

@@ -7,9 +7,9 @@
 ## 层级
 
 - **单元测试**（`pnpm run test`）：vitest 运行包（package）和示例各自的 `tests/**` 目录下的测试，以及匹配 `scripts/**/*.spec.ts` 的仓库脚本测试；测试文件与其所覆盖的代码区域放在一起。每个注册表都有一个 HMR（热模块替换）安全测试（dispose（资源释放）贡献的 fiber，断言清理完成）。优先覆盖边界情况、错误路径、事件顺序、并发竞态，以及永久性契约回归（见 `packages/core/agent-loop/tests/contract-regressions.spec.ts`）。
-- **覆盖率门禁**（`pnpm run test:coverage`）：门禁级运行，对 `packages/*/*/src` 按文件 100% 覆盖。未覆盖的行往往是门禁正确标记出的死代码（应删除），而非需要补写的测试。行覆盖率是必要条件，但永远不是充分条件：它证明行被执行过，不证明功能按交付预期工作。
+- **覆盖率门禁**（`pnpm run test:coverage`）：门禁级运行，对 `packages/*/*/src` 按文件 100% 覆盖。未覆盖的行往往是门禁正确标记出的死代码（应删除），而非需要补写的测试。行覆盖率是必要条件，但永远不是充分条件：它证明行被执行过，不证明功能按交付预期工作。`packages/bash/pwsh-local/src` 的按文件 100% 覆盖需要真实的 `pwsh`：缺少它时其 executor 套件会自动跳过，`vitest.config.ts` 会豁免该文件以使无 pwsh 的主机保持绿色，而 CI runner 自带 pwsh，仍按完整标准执行门禁。
 - **真实 API e2e**（`pnpm run test:e2e`）：带密钥测试调用真实提供方 API，包括 DeepSeek 模型以及各提供方特有的冒烟测试；这些测试各自由自己的密钥控制（`EXA_API_KEY`、`PERPLEXITY_API_KEY` 等），缺少密钥时套件会自动跳过，使 keyless CI 保持绿色（[真实 API e2e Agent Note](../.agents/notes/implemented/testing/2026-06-19-real-api-e2e-ci.md)）。
-- **快照**（`pnpm run test:snapshot`）：无密钥预期输出覆盖对外行为（传输契约与呈现），持久化日志则固定组装后的后端行为。ACP 启动真实的自动化服务器示例、回放录制会话，并对归一化 JSON-RPC 与重新持久化的日志执行 diff（[ACP 快照 Agent Note](../.agents/notes/implemented/testing/2026-06-19-acp-snapshot-tests.md)）；headless 通过真实单次运行进程固定 `stream-json`。当模型 transcript（文本记录）发生变化时使用 `pnpm run test:snapshot:record`，回放输入仍然有效时使用 `pnpm run test:snapshot:refresh`；请审查每一处 JSONL 与预期输出差异。一个 ACP 场景（`text-turn`）固定完整的系统提示词与工具 schema 内容；其他 fixture（测试前置数据）将其 token 化，因此修改只会扰动一行（[pinned-header Agent Note](../.agents/notes/archived/testing/2026-07-06-pin-request-header-content-in-one-scenario.md)）。
+- **快照**（`pnpm run test:snapshot`）：无密钥预期输出覆盖对外行为（传输契约与呈现），持久化日志则固定组装后的后端行为。ACP 启动真实的自动化服务器示例、回放录制会话，并对归一化 JSON-RPC 与重新持久化的日志执行 diff（[ACP 快照 Agent Note](../.agents/notes/implemented/testing/2026-06-19-acp-snapshot-tests.md)）；headless 通过真实单次运行进程固定 `stream-json`。TUI 旅程通过真实循环与工具回放主会话与子会话 JSONL，再将 ANSI 投影为语义化终端状态输出；包级快照保留瞬态状态，真实 PTY 覆盖进程边界（[TUI 快照 Agent Note](../.agents/notes/archived/testing/2026-07-18-tui-terminal-state-snapshots.md)）。当模型 transcript（文本记录）发生变化时使用 `pnpm run test:snapshot:record`，回放输入仍然有效时使用 `pnpm run test:snapshot:refresh`；请审查每一处 JSONL 与预期输出差异。一个 ACP 场景（`text-turn`）固定完整的系统提示词与工具 schema 内容；其他 fixture（测试前置数据）将其 token 化，因此修改只会扰动一行（[pinned-header Agent Note](../.agents/notes/archived/testing/2026-07-06-pin-request-header-content-in-one-scenario.md)）。
 - **Web 浏览器快照**（`pnpm run test:web`；必需的 Linux PR（Pull Request）门禁）：Chromium 将回放后的浏览器输出与 `apps/web/tests/snapshots/` 比较。CI 强制只读的 `DSH_SNAPSHOT=replay`，绝不写入预期输出；record/refresh 留在本地，每处 diff 都须评审（[web e2e 车道](../.agents/notes/implemented/testing/2026-07-24-web-gui-browser-e2e-lane.md)、[CI 门禁决策](../.agents/notes/implemented/testing/2026-07-30-web-browser-snapshot-ci-gate.md)）。`test:web` 会[先构建](../.agents/notes/implemented/bug-fix/2026-07-28-themed-scrollbars-and-reserved-gutter.md)以交付插件 CSS。
 
 签入仓库的会话格式 JSONL 使用规范打包行布局，无密钥快照门禁会通过 `session` header 发现每一份此类 fixture。仍携带旧版 fixture 改动的在途分支应合并当前 `master`，并通过 `pnpm run migrate:packed-session-fixtures` 运行[临时迁移器](../scripts/migrate-packed-session-fixtures.ts)；待所有受影响分支收敛后，[移除提案](../.agents/notes/proposed/process/2026-07-26-remove-packed-session-fixture-migrator.md)会移除该命令及这些链接。
@@ -46,4 +46,4 @@ e2e 断言应重新运行命令或从外部重新读取文件；对 agent 自身
 
 ## 何时需要快照测试
 
-每项非平凡的模型可见、协议可见或人类可见变更，都必须在同一 PR 中，通过可运行示例所属的快照套件添加或更新无密钥场景。包测试、e2e 断言、mock 与仅测试组合、PR 理由都不能取代组装后的 transcript；必要时应扩展 harness。ACP 自动化场景使用 `examples/<name>/tests/snapshots/`，即基于 [`dsh-acp-snapshot`](../packages/support/acp-snapshot/README.md) 套件工厂的场景表（`examples/acp-agent` 为主套件）；`examples/headless-agent` 拥有 `stream-json` 快照与回放 fixture。浏览器渲染的 Web GUI 旅程使用 `apps/web/tests/snapshots/`。新的能力 seam、生命周期形态或 transcript 呈现接口在计划阶段就要列出每个覆盖层级，并在实现前验证 harness 能够表达它们。
+每项非平凡的模型可见、协议可见或人类可见变更，都必须在同一 PR 中，通过可运行示例所属的快照套件添加或更新无密钥场景。包测试、e2e 断言、mock 与仅测试组合、PR 理由都不能取代组装后的 transcript；必要时应扩展 harness。ACP 自动化场景使用 `examples/<name>/tests/snapshots/`，即基于 [`dsh-acp-snapshot`](../packages/support/acp-snapshot/README.md) 套件工厂的场景表（`examples/acp-agent` 为主套件）；`examples/headless-agent` 拥有 `stream-json` 快照与回放 fixture。`pwsh-tool-turn` ACP 场景启动真实 `pwsh`，在无 `pwsh` 的主机上跳过。已完成的交互式终端旅程使用 `apps/cli/tests/snapshots/` 下由 JSONL 驱动的场景；瞬态呈现使用包内语义矩阵，输入、Loader 选择或终端清理发生变化时还要添加 PTY 用例。新的能力 seam、生命周期形态或 transcript 呈现接口在计划阶段就要列出每个覆盖层级，并在实现前验证 harness 能够表达它们。

docs/tool-catalog.md

@@ -18,7 +18,8 @@ This table connects model-visible tool names to the plugin package and service s
 | `@deepseek-ai/dsh-tool-ask-user` | `ask_user_question` | `ctx.tools`, `ctx.userInteraction` | `tool/call`, `tool/result after a UI/provider answers the question` | - | ask_user_question pauses the tool call until the active UI provider returns a human answer. |
 | `@deepseek-ai/dsh-tools` | `run_code` | `ctx.tools`, `ctx.codeRuntime (execution time)`, `ctx.systemPrompt` | `tool/call`, `one tool/code-dispatch-start + tool/code-dispatch pair per bridged sub-call`, `tool/result` | - | Owned by the tool registry as a reserved transport outside filterable capability layers under `mode: code` / `mode: both` (see the Code Mode Agent Note). Under `code` it is the registry's only wire contribution; the other visible capabilities are declared in a generated TypeScript SDK section, and a program calls them through bindings scheduled under the native concurrency contract (submission-ordered starts and policy; concurrency-safe bodies overlap up to `maxParallelSubCalls`) that re-enter the complete guarded tool pipeline and link each nested execution to this outer result. |
 | `@deepseek-ai/dsh-plan-mode` | `exit_plan_mode` | `ctx.tools`, `ctx.systemPrompt`, `ctx.userInteraction (execution time, opportunistic)` | `tool/call`, `plan/mode inactive on an approved review`, `tool/result` | - | exit_plan_mode stays in the model-facing schema while planning is inactive so transitions add no tool-catalog churn on top of the plan-policy change. Its execute path rejects calls outside plan mode; in plan mode it presents the plan over the user-interaction seam (approve / keep planning with feedback), and approval logs plan mode inactive at the step boundary. |
-| `@deepseek-ai/dsh-tool-bash` | `bash` | `ctx.tools`, `ctx.bash`, `ctx.tasks at call time for run_in_background` | `tool/call`, `tool/result` | - | The bash tool is the model-facing consumer of the bash executor seam. A `run_in_background` run registers with the generic `ctx.tasks` runtime and is collected/stopped through the `task_*` tools from `@deepseek-ai/dsh-tool-tasks`; the `enableRunInBackground` config (default true) removes the parameter entirely when disabled. |
+| `@deepseek-ai/dsh-tool-bash` | `bash` | `ctx.tools`, `ctx.bash`, `ctx.systemPrompt`, `ctx.bashEnv`, `ctx.tasks at call time for run_in_background` | `tool/call`, `tool/result` | - | The bash tool is the model-facing consumer of the bash executor seam. A `run_in_background` run registers with the generic `ctx.tasks` runtime and is collected/stopped through the `task_*` tools from `@deepseek-ai/dsh-tool-tasks`; the `enableRunInBackground` config (default true) removes the parameter entirely when disabled. |
+| `@deepseek-ai/dsh-tool-pwsh` | `pwsh` | `ctx.tools`, `ctx.bash`, `ctx.systemPrompt`, `ctx.bashEnv`, `ctx.tasks at call time for run_in_background` | `tool/call`, `tool/result` | - | The pwsh tool is the PowerShell-dialect consumer of the bash executor seam for Windows compositions (a PowerShell executor such as `@deepseek-ai/dsh-pwsh-local` backs `ctx.bash`); it mirrors the bash tool call-for-call minus the sandbox surface — `run_in_background` runs register with the generic `ctx.tasks` runtime and are collected/stopped through the `task_*` tools, and the managed `DSH_*` environment comes from `@deepseek-ai/dsh-bash-env`. Each call runs in a fresh process (no persistent PTY session; ConPTY is roadmap work), with native `C:\...` paths and `$env:NAME` variables. |
 | `@deepseek-ai/dsh-tool-cordis` | `cordis_inspect`, `cordis_mount`, `cordis_unmount` | `ctx.tools` | `tool/call`, `tool/result`, `process-local temporary Plugin lifecycle` | - | Not in any shipped tree (a deliberate opt-in — temporary Plugin code reaches the real runtime, see .agents/notes/implemented/feature/2026-07-08-self-referential-cordis-toolset.md). Plugins created by cordis_mount may register ADDITIONAL model-visible tools until unmounted or DSH restarts; a full changed request header logs those tool-set changes. |
 | `@deepseek-ai/dsh-tool-bash-persistent` | `bash` | `ctx.tools`, `ctx.pty`, `an owning Agent at execution time` | `tool/call`, `PTY shell state`, `tool/result` | - | One owner-isolated persistent bash tool; deployment composition supplies the PTY backend and may override the model-facing environment description. |
 | `@deepseek-ai/dsh-tool-str-replace-editor` | `str_replace_editor` | `ctx.tools`, `ctx.fs` | `tool/call`, `fs/observed after successful file operations`, `tool/result` | - | Standalone view/create/unique literal replace/line insert tool over the filesystem seam; it composes with any shell or terminal surface. |
@@ -207,6 +208,48 @@ Source: [`packages/bash/tool-bash/src/index.ts`](../packages/bash/tool-bash/src/
 
 The bash tool is the model-facing consumer of the bash executor seam. A `run_in_background` run registers with the generic `ctx.tasks` runtime and is collected/stopped through the `task_*` tools from `@deepseek-ai/dsh-tool-tasks`; the `enableRunInBackground` config (default true) removes the parameter entirely when disabled.
 
+## `@deepseek-ai/dsh-tool-pwsh`
+
+### `pwsh`
+
+Execute a PowerShell command (`pwsh -Command`) and return its stdout/stderr. Each call runs in a fresh pwsh process: no state (cwd, variables, functions) persists between calls — pass `workdir` instead of using `cd`. Paths use native Windows form (`C:\...`); read environment variables with `$env:NAME`. Non-zero exits are reported as `[exit code: N]`. Current harness environment facts are exposed through managed `$env:DSH_*` variables; inspect them when needed. Long output is truncated to its tail; the full output is saved to a file whose path is reported when available. On Windows a force-killed command settles as `[exit code: 1]` without a signal marker — treat it as an interruption, not a command failure. Set `run_in_background: true` for long-running commands: the call returns a task id immediately; read its output with `task_output` and stop it with `task_kill`.
+
+```json
+{
+  "type": "object",
+  "properties": {
+    "command": {
+      "type": "string",
+      "description": "The PowerShell command to execute."
+    },
+    "description": {
+      "type": "string",
+      "description": "Clear, concise description of what this command does in active voice, 5-10 words (shown in the UI). Examples: \"ls\" → \"List files in current directory\"; \"git status\" → \"Show working tree status\"; \"Get-Process\" → \"List running processes\"."
+    },
+    "timeoutMs": {
+      "type": "number",
+      "description": "Timeout in milliseconds. The executor applies its configured default and cap, and kills the command on expiry."
+    },
+    "workdir": {
+      "type": "string",
+      "description": "Working directory for this command. Defaults to the session workspace; a relative path is resolved against it."
+    },
+    "run_in_background": {
+      "type": "boolean",
+      "description": "Run in the background and return a task id immediately (collect with task_output, stop with task_kill). No timeout applies."
+    }
+  },
+  "required": [
+    "command",
+    "description"
+  ]
+}
+```
+
+Source: [`packages/bash/tool-pwsh/src/index.ts`](../packages/bash/tool-pwsh/src/index.ts)
+
+The pwsh tool is the PowerShell-dialect consumer of the bash executor seam for Windows compositions (a PowerShell executor such as `@deepseek-ai/dsh-pwsh-local` backs `ctx.bash`); it mirrors the bash tool call-for-call minus the sandbox surface — `run_in_background` runs register with the generic `ctx.tasks` runtime and are collected/stopped through the `task_*` tools, and the managed `DSH_*` environment comes from `@deepseek-ai/dsh-bash-env`. Each call runs in a fresh process (no persistent PTY session; ConPTY is roadmap work), with native `C:\...` paths and `$env:NAME` variables.
+
 ## `@deepseek-ai/dsh-tool-cordis`
 
 ### `cordis_inspect`

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

@@ -1,10 +1,12 @@
 import { fileURLToPath } from 'node:url'
 import { readFileSync } from 'node:fs'
+import { spawnSync } from 'node:child_process'
 import { mkdir, utimes, writeFile } from 'node:fs/promises'
 import { dirname, join } from 'node:path'
 import { homedir } from 'node:os'
 import { expect, it } from 'vitest'
 import { defineAcpSnapshotSuite, type Scenario, type SnapshotSuiteOptions } from '@deepseek-ai/dsh-acp-snapshot'
+import { resolvePwshPath } from '@deepseek-ai/dsh-pwsh-local'
 import { decodeStorageRecord } from '@deepseek-ai/dsh-session'
 
 /**
@@ -47,6 +49,7 @@ const SUBAGENT_DURABILITY_FAILURE_CONFIG = fileURLToPath(
 const LSP_CONFIG = fileURLToPath(new URL('./lsp.cordis.yml', import.meta.url))
 const WEB_CONFIG = fileURLToPath(new URL('../web.cordis.yml', import.meta.url))
 const FS_SEARCH_CONFIG = fileURLToPath(new URL('./fs-search.cordis.yml', import.meta.url))
+const PWSH_CONFIG = fileURLToPath(new URL('./pwsh.cordis.yml', import.meta.url))
 const SNAPSHOTS_DIR = join(dirname(fileURLToPath(import.meta.url)), 'snapshots')
 const PACKED_CHUNKS_SOURCE = 'hook-cc-pretool-deny'
 
@@ -157,6 +160,22 @@ const SCENARIOS: Scenario[] = [
     configPath: PTY_CONFIG,
   },
   { name: 'bash-tool-turn', hasModelTurn: true, recorded: true },
+  // The pwsh overlay (pwsh.cordis.yml / pwsh.cordis.snapshot.yml) swaps the
+  // bundle's bash tool for the PowerShell twin, so its header class pins its
+  // own prompt/tool sidecars and a recorded transcript.
+  {
+    name: 'pwsh-tool-turn',
+    hasModelTurn: true,
+    recorded: true,
+    pinsHeader: true,
+    headerClass: 'pwsh',
+    configPath: PWSH_CONFIG,
+    // The composition boots the real pwsh executor; hosts without a `pwsh`
+    // binary skip the run (fixtures stay guarded). The recorded turn writes
+    // PWSH_OK via [Console]::Out.Write so the fixture carries no platform
+    // newline and one recording replays on every host.
+    pwshOnly: true,
+  },
   { name: 'todo-write', hasModelTurn: true, recorded: true },
   {
     name: 'skill-load',
@@ -419,11 +438,17 @@ const SCENARIOS: Scenario[] = [
   },
 ]
 
+// Hosts without a usable PowerShell skip the pwsh-tool-turn run (its fixtures
+// stay guarded); the probe follows the executor's own resolution so a Windows
+// host with only an install-location pwsh still runs the scenario.
+const hasPwsh = spawnSync(resolvePwshPath(), ['-NoLogo', '-NoProfile', '-NonInteractive', '-Command', '$true'], { encoding: 'utf8' }).status === 0
+
 defineAcpSnapshotSuite({
   agent: AGENT,
   snapshotsDir: SNAPSHOTS_DIR,
   scenarios: SCENARIOS,
   mode: snapshotModeFromEnv(process.env.DSH_SNAPSHOT),
+  hasPwsh,
 })
 
 it('packed ACP fixture retains every chunk row kind without changing the logical session', () => {

examples/acp-agent/tests/fixtures/bash/tool-pwsh/cordis.yml

@@ -0,0 +1,27 @@
+# Minimal tool-pwsh composition: real app boot path, real pwsh executor, real
+# foreground + background tool calls; driven by the package's loader.spec.ts.
+- id: system-prompt
+  name: '@deepseek-ai/dsh-system-prompt'
+
+- id: tools
+  name: '@deepseek-ai/dsh-tools'
+
+- id: subprocess
+  name: '@deepseek-ai/dsh-subprocess-local'
+
+- id: bash
+  name: '@deepseek-ai/dsh-pwsh-local'
+  config:
+    graceMs: 200
+
+- id: bash-env
+  name: '@deepseek-ai/dsh-bash-env'
+
+- id: tasks
+  name: '@deepseek-ai/dsh-tasks-local'
+
+- id: tool-tasks
+  name: '@deepseek-ai/dsh-tool-tasks'
+
+- id: tool-pwsh
+  name: '@deepseek-ai/dsh-tool-pwsh'

examples/acp-agent/tests/fixtures/bash/tool-pwsh/driver.ts

@@ -0,0 +1,67 @@
+#!/usr/bin/env node
+/**
+ * Test driver: boot the tool-pwsh Loader composition, execute one real
+ * foreground and one real background pwsh command through the tool registry,
+ * and persist the observed model-visible output to `./pwsh-loader-report.json`
+ * for the package spec's inspect step.
+ */
+
+import { writeFile } from 'node:fs/promises'
+import { boot, resolveConfigPath } from '@deepseek-ai/dsh-app-boot'
+import { CallId } from '@deepseek-ai/dsh-llm'
+
+const configPath = process.argv[2]
+if (configPath === undefined) throw new Error('tool-pwsh driver requires a config path')
+
+const ctx = await boot('tool-pwsh-loader-smoke', resolveConfigPath(configPath, undefined))
+try {
+  const schema = ctx.tools.schemas().find(tool => tool.name === 'pwsh')
+  if (schema === undefined) throw new Error('pwsh tool not registered by the composition')
+  const prompt = (await ctx.systemPrompt.assemble()).sections.find(section => section.name === 'tool:pwsh')
+
+  const foreground = await ctx.tools.execute({
+    signal: new AbortController().signal,
+    callId: CallId('loader-fg'),
+    name: 'pwsh',
+    arguments: { command: 'Write-Output loader-ok', description: 'loader foreground' },
+  })
+  const foregroundText = foreground.content.filter(block => block.type === 'text').map(block => block.text).join('')
+
+  const background = await ctx.tools.execute({
+    signal: new AbortController().signal,
+    callId: CallId('loader-bg'),
+    name: 'pwsh',
+    arguments: {
+      command: 'Start-Sleep -Milliseconds 200; Write-Output loader-bg-ok',
+      description: 'loader background',
+      run_in_background: true,
+    },
+  })
+  const taskId = (background.value as { taskId: string }).taskId
+
+  // The output delta and the terminal status can land in separate reads
+  // (Windows flushes the child pipe at exit), so accumulate both.
+  let backgroundText = ''
+  const deadline = Date.now() + 10_000
+  while (Date.now() < deadline) {
+    const read = await ctx.tools.execute({
+      signal: new AbortController().signal,
+      callId: CallId('loader-bg-read'),
+      name: 'task_output',
+      arguments: { task_id: taskId },
+    })
+    backgroundText += read.content.filter(block => block.type === 'text').map(block => block.text).join('')
+    if (backgroundText.includes('loader-bg-ok') && backgroundText.includes('[status: completed')) break
+    await new Promise(resolve => setTimeout(resolve, 50))
+  }
+
+  await writeFile('./pwsh-loader-report.json', JSON.stringify({
+    schemaHasRunInBackground: Object.hasOwn(schema.parameters.properties as object, 'run_in_background'),
+    promptHasMarkerSection: prompt?.text.includes('Non-zero exits are reported as `[exit code: N]` markers') === true,
+    // Normalize PowerShell's platform line endings (CRLF on Windows, LF elsewhere).
+    foregroundText: foregroundText.replace(/\r\n/g, '\n'),
+    backgroundText: backgroundText.replace(/\r\n/g, '\n'),
+  }))
+} finally {
+  await ctx.fiber.dispose()
+}

examples/acp-agent/tests/pwsh.cordis.snapshot.yml

@@ -0,0 +1,38 @@
+# Minimal keyless composition: real app, pwsh executor, and pwsh tool; replayed model.
+- id: llm-replay
+  name: '@deepseek-ai/dsh-llm-replay'
+  config:
+    providers:
+      - id: deepseek-official
+        name: DeepSeek
+        models:
+          - id: deepseek-v4-pro
+
+- id: subprocess
+  name: '@deepseek-ai/dsh-subprocess-local'
+
+- id: bash
+  name: '@deepseek-ai/dsh-pwsh-local'
+
+- id: bash-env
+  name: '@deepseek-ai/dsh-bash-env'
+
+- id: acp-agent
+  name: '@deepseek-ai/dsh-acp-demo'
+  config:
+    provider: deepseek-official
+    model: deepseek-v4-pro
+    persistenceRoot: !!js process.env.DSH_SNAPSHOT_SESSIONS_ROOT ?? './.sessions'
+    persistenceCompression: none
+    workspaceContext: false
+    skills:
+      enabled: false
+    # task_output/task_kill stay mounted (the bundle's toolTasks default) so
+    # background pwsh runs are readable and killable.
+    goals: false
+    # The pwsh tool replaces the bundle's bash tool in this composition.
+    toolBash: false
+    persona: You are a concise snapshot agent working in {{cwd}}.
+
+- id: tool-pwsh
+  name: '@deepseek-ai/dsh-tool-pwsh'

examples/acp-agent/tests/pwsh.cordis.yml

@@ -0,0 +1,37 @@
+# Minimal live counterpart for the pwsh-tool-turn snapshot composition.
+- id: llm-deepseek
+  name: '@deepseek-ai/dsh-llm-deepseek'
+  config:
+    apiKey: !!js process.env.DEEPSEEK_API_KEY
+    baseURL: !!js process.env.DEEPSEEK_BASE_URL
+    models:
+      - id: deepseek-v4-pro
+
+- id: subprocess
+  name: '@deepseek-ai/dsh-subprocess-local'
+
+- id: bash
+  name: '@deepseek-ai/dsh-pwsh-local'
+
+- id: bash-env
+  name: '@deepseek-ai/dsh-bash-env'
+
+- id: acp-agent
+  name: '@deepseek-ai/dsh-acp-demo'
+  config:
+    provider: deepseek-official
+    model: deepseek-v4-pro
+    persistenceRoot: !!js process.env.DSH_SNAPSHOT_SESSIONS_ROOT ?? './.sessions'
+    persistenceCompression: !!js "process.env.DSH_SNAPSHOT === undefined ? 'zstd' : 'none'"
+    workspaceContext: false
+    skills:
+      enabled: false
+    # task_output/task_kill stay mounted (the bundle's toolTasks default) so
+    # background pwsh runs are readable and killable.
+    goals: false
+    # The pwsh tool replaces the bundle's bash tool in this composition.
+    toolBash: false
+    persona: You are a concise snapshot agent working in {{cwd}}.
+
+- id: tool-pwsh
+  name: '@deepseek-ai/dsh-tool-pwsh'

examples/acp-agent/tests/snapshots/cancel-tool-calls/session.jsonl

@@ -16,7 +16,7 @@
 {"type":"assistant/chunk","seq":14,"time":1785487611319,"data":{"turn":1,"step":1,"chunk":{"type":"finish","reason":{"kind":"tool-calls"}}}}
 {"type":"assistant/message","seq":15,"time":1785487611319,"data":{"turn":1,"step":1,"message":{"role":"assistant","content":[{"type":"tool-call","id":"call_wait","name":"bash","arguments":"{\"command\":\"node -e \\\"require('node:fs').writeFileSync('started.txt', 'started'); setInterval(() => {}, 1000)\\\"\",\"description\":\"Wait until cancellation\"}"},{"type":"tool-call","id":"call_skipped","name":"bash","arguments":"{\"command\":\"printf skipped > skipped.txt\",\"description\":\"Write skipped marker\"}"}],"source":{"kind":"model","provider":"deepseek-official","model":"deepseek-v4-flash"},"id":"bd630f41-b45d-4183-a785-1ff6e7049b62"},"usage":{"inputTokens":10,"outputTokens":10}},"sourceEventSeqs":[7,8,9,10,11,12,13,14],"surfaceOp":"append"}
 {"type":"tool/call","seq":16,"time":1785487611319,"data":{"turn":1,"step":1,"callId":"call_wait","name":"bash","arguments":"{\"command\":\"node -e \\\"require('node:fs').writeFileSync('started.txt', 'started'); setInterval(() => {}, 1000)\\\"\",\"description\":\"Wait until cancellation\"}"}}
-{"type":"tool/result","seq":17,"time":1785487611378,"data":{"turn":1,"step":1,"message":{"source":{"kind":"tool","callId":"call_wait"},"content":[{"type":"tool-result","toolCallId":"call_wait","content":[{"type":"text","text":"Error: command aborted"}],"isError":true}],"role":"user","id":"252903b2-b4e1-4a33-81d8-d5befefcb27e"}},"sourceEventSeqs":[16],"surfaceOp":"append"}
+{"type":"tool/result","seq":17,"time":1785487611378,"data":{"turn":1,"step":1,"message":{"source":{"kind":"tool","callId":"call_wait"},"content":[{"type":"tool-result","toolCallId":"call_wait","content":[{"type":"text","text":"Error: tool call aborted"}],"isError":true}],"role":"user","id":"252903b2-b4e1-4a33-81d8-d5befefcb27e"},"error":{"name":"AbortError","code":"ABORTED"}},"sourceEventSeqs":[16],"surfaceOp":"append"}
 {"type":"tool/call","seq":18,"time":1785487611378,"data":{"turn":1,"step":1,"callId":"call_skipped","name":"bash","arguments":"{\"command\":\"printf skipped > skipped.txt\",\"description\":\"Write skipped marker\"}"}}
 {"type":"tool/result","seq":19,"time":1785487611378,"data":{"turn":1,"step":1,"message":{"source":{"kind":"tool","callId":"call_skipped"},"content":[{"type":"tool-result","toolCallId":"call_skipped","content":[{"type":"text","text":"Error: tool call aborted before dispatch"}],"isError":true}],"role":"user","id":"282c5c8c-7296-4545-8014-e6393b351436"},"error":{"name":"AbortError","code":"ABORTED_BEFORE_DISPATCH"}},"sourceEventSeqs":[18],"surfaceOp":"append"}
 {"type":"step/end","seq":20,"time":1785487611378,"data":{"turn":1,"step":1}}

examples/acp-agent/tests/snapshots/pwsh-tool-turn/input.json

@@ -0,0 +1,7 @@
+{
+  "steps": [
+    { "op": "initialize" },
+    { "op": "newSession" },
+    { "op": "prompt", "text": "Use the pwsh tool to run exactly: [Console]::Out.Write('PWSH_OK'). Then reply with the single word DONE and stop." }
+  ]
+}

examples/acp-agent/tests/snapshots/pwsh-tool-turn/session.jsonl

@@ -0,0 +1,32 @@
+{"type":"session","version":0,"id":"0b7ff6ab-2486-4b2f-a43e-0fa29a1a46ed","createdAt":1785678162241,"cwd":"{{cwd}}","delegationDepth":0}
+{"type":"turn/start","seq":0,"time":1785678162244,"data":{"turn":1,"trigger":{"kind":"message","source":{"kind":"user"}}}}
+{"type":"user/message","seq":1,"time":1785678162245,"data":{"content":[{"type":"text","text":"Use the pwsh tool to run exactly: [Console]::Out.Write('PWSH_OK'). Then reply with the single word DONE and stop."}],"source":{"kind":"user"},"role":"user","id":"6efbdc24-7abe-4f34-ac6d-15f93d49ad9a"},"surfaceOp":"append"}
+{"type":"session/title","seq":2,"time":1785678162246,"data":{"title":"Use the pwsh tool to","messageSeqs":[1],"source":{"kind":"fallback"}}}
+{"type":"step/start","seq":3,"time":1785678162261,"data":{"turn":1,"step":1}}
+{"type":"request/header","seq":4,"time":1785678162261,"data":{"header":{"config":{"provider":"deepseek-official","model":"deepseek-v4-pro"},"system":"{{system}}","tools":"{{tools}}"},"reason":"initial"}}
+{"type":"request/context","seq":5,"time":1785678162262,"data":{"provider":"deepseek-official","model":"deepseek-v4-pro"}}
+{"type":"assistant/chunk","seq":6,"time":1785678162968,"data":{"turn":1,"step":1,"chunk":{"type":"block-start","index":0,"blockType":"reasoning"}}}
+{"type":"reasoning-chunks","seq0":7,"time0":1785678162968,"data":{"turn":1,"step":1,"index":0,"dt":[393,0,0,0,1,0,0,0,0,0,17,0,0,0,0,0,0,0,1,290,0],"texts":["The"," user"," wants"," me"," to"," run"," a"," PowerShell"," command"," and"," then"," reply"," with"," \"","D","ONE","\"."," Let"," me"," execute"," it","."]}}
+{"type":"assistant/chunk","seq":29,"time":1785678163671,"data":{"turn":1,"step":1,"chunk":{"type":"block-start","index":1,"blockType":"tool-call"}}}
+{"type":"tool-call-chunks","seq0":30,"time0":1785678163671,"data":{"turn":1,"step":1,"index":1,"dt":[0,0,0,0,0,0,17,0,0,0,0,0,109,0,0,0,0,0,0,22,0,0,0,0,275,0,1,0,0,0,0,0,0,0],"id":"call_00_e0MSVSocL0o4UWjOdG4c2072","name":"pwsh","args":["","{","\"","command","\"",": ","\"","[","Console","]","::","Out",".Write","('","P","WS","H","_OK","')","\"",", ","\"","description","\"",": ","\"","Write"," P","WS","H","_OK"," to"," console","\"","}"]}}
+{"type":"assistant/chunk","seq":65,"time":1785678164124,"data":{"turn":1,"step":1,"chunk":{"type":"block-end","index":0,"block":{"type":"reasoning","text":"The user wants me to run a PowerShell command and then reply with \"DONE\". Let me execute it."}}}}
+{"type":"assistant/chunk","seq":66,"time":1785678164124,"data":{"turn":1,"step":1,"chunk":{"type":"block-end","index":1,"block":{"type":"tool-call","id":"call_00_e0MSVSocL0o4UWjOdG4c2072","name":"pwsh","arguments":"{\"command\": \"[Console]::Out.Write('PWSH_OK')\", \"description\": \"Write PWSH_OK to console\"}"}}}}
+{"type":"assistant/chunk","seq":67,"time":1785678164124,"data":{"turn":1,"step":1,"chunk":{"type":"usage","usage":{"inputTokens":1255,"outputTokens":99,"cacheReadTokens":0,"reasoningTokens":22}}}}
+{"type":"assistant/chunk","seq":68,"time":1785678164124,"data":{"turn":1,"step":1,"chunk":{"type":"finish","reason":{"kind":"tool-calls"}}}}
+{"type":"assistant/message","seq":69,"time":1785678164126,"data":{"turn":1,"step":1,"message":{"role":"assistant","content":[{"type":"reasoning","text":"The user wants me to run a PowerShell command and then reply with \"DONE\". Let me execute it."},{"type":"tool-call","id":"call_00_e0MSVSocL0o4UWjOdG4c2072","name":"pwsh","arguments":"{\"command\": \"[Console]::Out.Write('PWSH_OK')\", \"description\": \"Write PWSH_OK to console\"}"}],"source":{"kind":"model","provider":"deepseek-official","model":"deepseek-v4-pro"},"id":"6e968eea-46b8-4489-8005-5e898d53c1a9"},"usage":{"inputTokens":1255,"outputTokens":99,"cacheReadTokens":0,"reasoningTokens":22}},"sourceEventSeqs":[6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,55,56,57,58,59,60,61,62,63,64,65,66,67,68],"surfaceOp":"append"}
+{"type":"tool/call","seq":70,"time":1785678164127,"data":{"turn":1,"step":1,"callId":"call_00_e0MSVSocL0o4UWjOdG4c2072","name":"pwsh","arguments":"{\"command\": \"[Console]::Out.Write('PWSH_OK')\", \"description\": \"Write PWSH_OK to console\"}"}}
+{"type":"tool/result","seq":71,"time":1785678164405,"data":{"turn":1,"step":1,"message":{"source":{"kind":"tool","callId":"call_00_e0MSVSocL0o4UWjOdG4c2072"},"content":[{"type":"tool-result","toolCallId":"call_00_e0MSVSocL0o4UWjOdG4c2072","content":[{"type":"text","text":"PWSH_OK"}],"isError":false}],"role":"user","id":"964dfad5-651e-47f0-90a5-fe5bc711a3ff"}},"sourceEventSeqs":[70],"surfaceOp":"append"}
+{"type":"step/end","seq":72,"time":1785678164405,"data":{"turn":1,"step":1}}
+{"type":"step/start","seq":73,"time":1785678164410,"data":{"turn":1,"step":2}}
+{"type":"assistant/chunk","seq":74,"time":1785678165135,"data":{"turn":1,"step":2,"chunk":{"type":"block-start","index":0,"blockType":"reasoning"}}}
+{"type":"reasoning-chunks","seq0":75,"time0":1785678165136,"data":{"turn":1,"step":2,"index":0,"dt":[176,44,56,0,0,42,0,0,0,48,0,0,0,48,0,0,60,0,0,0,0,39,0,0],"texts":["The"," command"," executed"," successfully"," and"," printed"," \"","P","WS","H","_OK","\"."," Now"," I"," need"," to"," reply"," with"," \"","D","ONE","\""," and"," stop","."]}}
+{"type":"assistant/chunk","seq":100,"time":1785678165649,"data":{"turn":1,"step":2,"chunk":{"type":"block-start","index":1,"blockType":"text"}}}
+{"type":"assistant/chunk","seq":101,"time":1785678165649,"data":{"turn":1,"step":2,"chunk":{"type":"text-delta","index":1,"text":"D"}}}
+{"type":"assistant/chunk","seq":102,"time":1785678165649,"data":{"turn":1,"step":2,"chunk":{"type":"text-delta","index":1,"text":"ONE"}}}
+{"type":"assistant/chunk","seq":103,"time":1785678165693,"data":{"turn":1,"step":2,"chunk":{"type":"block-end","index":0,"block":{"type":"reasoning","text":"The command executed successfully and printed \"PWSH_OK\". Now I need to reply with \"DONE\" and stop."}}}}
+{"type":"assistant/chunk","seq":104,"time":1785678165693,"data":{"turn":1,"step":2,"chunk":{"type":"block-end","index":1,"block":{"type":"text","text":"DONE"}}}}
+{"type":"assistant/chunk","seq":105,"time":1785678165693,"data":{"turn":1,"step":2,"chunk":{"type":"usage","usage":{"inputTokens":90,"outputTokens":28,"cacheReadTokens":1280,"reasoningTokens":25}}}}
+{"type":"assistant/chunk","seq":106,"time":1785678165693,"data":{"turn":1,"step":2,"chunk":{"type":"finish","reason":{"kind":"stop"}}}}
+{"type":"assistant/message","seq":107,"time":1785678165693,"data":{"turn":1,"step":2,"message":{"role":"assistant","content":[{"type":"reasoning","text":"The command executed successfully and printed \"PWSH_OK\". Now I need to reply with \"DONE\" and stop."},{"type":"text","text":"DONE"}],"source":{"kind":"model","provider":"deepseek-official","model":"deepseek-v4-pro"},"id":"91f35706-53e9-4fcd-891e-2c9eafccde98"},"usage":{"inputTokens":90,"outputTokens":28,"cacheReadTokens":1280,"reasoningTokens":25}},"sourceEventSeqs":[74,75,76,77,78,79,80,81,82,83,84,85,86,87,88,89,90,91,92,93,94,95,96,97,98,99,100,101,102,103,104,105,106],"surfaceOp":"append"}
+{"type":"step/end","seq":108,"time":1785678165694,"data":{"turn":1,"step":2}}
+{"type":"turn/end","seq":109,"time":1785678165694,"data":{"turn":1,"reason":{"kind":"completed"}}}

examples/acp-agent/tests/snapshots/pwsh-tool-turn/stdout.expected.jsonl

@@ -0,0 +1,4 @@
+{"jsonrpc":"2.0","id":1,"result":{"protocolVersion":1,"agentInfo":{"name":"deepseek-harness-acp","version":"0.0.1"},"agentCapabilities":{"promptCapabilities":{"image":false,"audio":false,"embeddedContext":false}},"authMethods":[]}}
+{"jsonrpc":"2.0","id":2,"result":{"sessionId":"{{sessionId}}"}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_message_chunk","content":{"type":"text","text":"DONE"}}}}
+{"jsonrpc":"2.0","id":3,"result":{"stopReason":"end_turn"}}

examples/acp-agent/tests/snapshots/pwsh-tool-turn/system-prompt.expected.md

@@ -0,0 +1,7 @@
+You are an AI agent powered by the DeepSeek Harness SDK.
+
+You are a concise snapshot agent working in {{cwd}}.
+
+Non-zero exits are reported as `[exit code: N]` markers; investigate failures before moving on. On Windows a killed process settles as `[exit code: 1]` without a signal marker; treat a bare exit 1 after an interruption as a termination, not a command failure.
+
+Track every background task id you start. You are notified in-session when a task finishes — do not busy-poll or sleep on one; keep working on independent steps and do not duplicate a running task's work. Before giving a final answer, collect every still-relevant task with task_output (set wait: true only when you are genuinely blocked on it), and task_kill tasks that stopped mattering.

examples/acp-agent/tests/snapshots/pwsh-tool-turn/tool-schemas.expected.json

@@ -0,0 +1,90 @@
+{
+  "initial": [
+    {
+      "name": "pwsh",
+      "description": "Execute a PowerShell command (`pwsh -Command`) and return its stdout/stderr. Each call runs in a fresh pwsh process: no state (cwd, variables, functions) persists between calls — pass `workdir` instead of using `cd`. Paths use native Windows form (`C:\\...`); read environment variables with `$env:NAME`. Non-zero exits are reported as `[exit code: N]`. Current harness environment facts are exposed through managed `$env:DSH_*` variables; inspect them when needed. Long output is truncated to its tail; the full output is saved to a file whose path is reported when available. On Windows a force-killed command settles as `[exit code: 1]` without a signal marker — treat it as an interruption, not a command failure. Set `run_in_background: true` for long-running commands: the call returns a task id immediately; read its output with `task_output` and stop it with `task_kill`.",
+      "parameters": {
+        "type": "object",
+        "properties": {
+          "command": {
+            "type": "string",
+            "description": "The PowerShell command to execute."
+          },
+          "description": {
+            "type": "string",
+            "description": "Clear, concise description of what this command does in active voice, 5-10 words (shown in the UI). Examples: \"ls\" → \"List files in current directory\"; \"git status\" → \"Show working tree status\"; \"Get-Process\" → \"List running processes\"."
+          },
+          "timeoutMs": {
+            "type": "number",
+            "description": "Timeout in milliseconds. The executor applies its configured default and cap, and kills the command on expiry."
+          },
+          "workdir": {
+            "type": "string",
+            "description": "Working directory for this command. Defaults to the session workspace; a relative path is resolved against it."
+          },
+          "run_in_background": {
+            "type": "boolean",
+            "description": "Run in the background and return a task id immediately (collect with task_output, stop with task_kill). No timeout applies."
+          }
+        },
+        "required": [
+          "command",
+          "description"
+        ]
+      }
+    },
+    {
+      "name": "task_kill",
+      "description": "Request cancellation of a running background task by task id. Returns immediately; the task settles as killed once its work actually stops.",
+      "parameters": {
+        "type": "object",
+        "properties": {
+          "task_id": {
+            "type": "string",
+            "description": "Task id returned by the tool that started the background work."
+          },
+          "reason": {
+            "type": "string",
+            "description": "Optional short reason, recorded in the log and forwarded to the task."
+          }
+        },
+        "required": [
+          "task_id"
+        ]
+      }
+    },
+    {
+      "name": "task_list",
+      "description": "List your background tasks (running and finished) with their ids, kinds, and statuses.",
+      "parameters": {
+        "type": "object",
+        "properties": {}
+      }
+    },
+    {
+      "name": "task_output",
+      "description": "Read a background task. Stream tasks return only output since the previous read; final-output tasks return their result after settlement. Every response ends with `[status: ...]`. Reads are non-blocking unless `wait: true`, which waits up to the configured cap.",
+      "parameters": {
+        "type": "object",
+        "properties": {
+          "task_id": {
+            "type": "string",
+            "description": "Task id returned by the tool that started the background work."
+          },
+          "wait": {
+            "type": "boolean",
+            "description": "Block until the task reaches a terminal status or the timeout expires. A timed-out wait returns [status: running] and leaves the task alive."
+          },
+          "timeout_ms": {
+            "type": "number",
+            "description": "Max wait in milliseconds (only meaningful with wait: true). Defaults to the configured wait timeout; capped by the configured maximum."
+          }
+        },
+        "required": [
+          "task_id"
+        ]
+      }
+    }
+  ],
+  "changes": []
+}

examples/headless-agent/tests/code-mode.e2e.ts

@@ -13,6 +13,7 @@ import AgentRegistry, { type Agent } from '@deepseek-ai/dsh-agent'
 
 import AgentLoop from '@deepseek-ai/dsh-agent-loop'
 import { LocalBashExecutor } from '@deepseek-ai/dsh-bash-local'
+import * as BashEnvPlugin from '@deepseek-ai/dsh-bash-env'
 import LocalSubprocessService from '@deepseek-ai/dsh-subprocess-local'
 import * as ToolBash from '@deepseek-ai/dsh-tool-bash'
 import * as LlmDeepSeek from '@deepseek-ai/dsh-llm-deepseek'
@@ -57,6 +58,7 @@ async function codeModeHarness(cwd: string): Promise<Context> {
   await harness.plugin(AgentLoop, { agents: [] })
   await harness.plugin(LlmDeepSeek)
   await harness.plugin(LocalSubprocessService)
+  await harness.plugin(BashEnvPlugin)
   await harness.plugin(LocalBashExecutor, { cwd, timeoutMs: 30_000 })
   await harness.plugin(ToolBash)
   await harness.plugin(WorkerCodeRuntime, {})
@@ -117,6 +119,7 @@ async function backgroundCodeModeHarness(cwd: string): Promise<Context> {
   await harness.plugin(LocalTaskService)
   await harness.plugin(ToolTasks, {})
   await harness.plugin(LocalSubprocessService)
+  await harness.plugin(BashEnvPlugin)
   await harness.plugin(LocalBashExecutor, { cwd, timeoutMs: 30_000 })
   await harness.plugin(ToolBash)
   return harness

examples/headless-agent/tests/harness.ts

@@ -4,6 +4,7 @@ import type { Agent } from '@deepseek-ai/dsh-agent'
 import AgentLoop from '@deepseek-ai/dsh-agent-loop'
 import { mountAgentLoopTestDependencies } from '@deepseek-ai/dsh-agent-loop-testkit'
 import { LocalBashExecutor } from '@deepseek-ai/dsh-bash-local'
+import * as BashEnvPlugin from '@deepseek-ai/dsh-bash-env'
 import LocalSubprocessService from '@deepseek-ai/dsh-subprocess-local'
 import * as ToolBash from '@deepseek-ai/dsh-tool-bash'
 import * as ToolTodo from '@deepseek-ai/dsh-tool-todo'
@@ -61,6 +62,7 @@ export async function codingHarness(workdir: string, options: CodingHarnessOptio
     models: [{ id: 'deepseek-v4-flash', contextWindow: options.modelContextWindow }],
   })
   await ctx.plugin(LocalSubprocessService)
+  await ctx.plugin(BashEnvPlugin)
   await ctx.plugin(LocalBashExecutor, { cwd: workdir, timeoutMs: 30_000 })
   await ctx.plugin(ToolBash)
   await ctx.plugin(ToolTodo)

examples/package.json

@@ -14,6 +14,7 @@
     "@deepseek-ai/dsh-agent-spine-demo": "workspace:*",
     "@deepseek-ai/dsh-app-boot": "workspace:*",
     "@deepseek-ai/dsh-bash": "workspace:*",
+    "@deepseek-ai/dsh-bash-env": "workspace:*",
     "@deepseek-ai/dsh-bash-local": "workspace:*",
     "@deepseek-ai/dsh-bash-sandbox": "workspace:*",
     "@deepseek-ai/dsh-cli-demo": "workspace:*",
@@ -42,6 +43,7 @@
     "@deepseek-ai/dsh-plan-mode": "workspace:*",
     "@deepseek-ai/dsh-pty": "workspace:*",
     "@deepseek-ai/dsh-pty-local": "workspace:*",
+    "@deepseek-ai/dsh-pwsh-local": "workspace:*",
     "@deepseek-ai/dsh-repeat-tool-guard": "workspace:*",
     "@deepseek-ai/dsh-repository-plugin": "workspace:*",
     "@deepseek-ai/dsh-sandbox-local": "workspace:*",
@@ -81,6 +83,7 @@
     "@deepseek-ai/dsh-tool-goal": "workspace:*",
     "@deepseek-ai/dsh-tool-lsp": "workspace:*",
     "@deepseek-ai/dsh-tool-pty": "workspace:*",
+    "@deepseek-ai/dsh-tool-pwsh": "workspace:*",
     "@deepseek-ai/dsh-tool-ralph": "workspace:*",
     "@deepseek-ai/dsh-tool-session-query": "workspace:*",
     "@deepseek-ai/dsh-tool-skill": "workspace:*",

packages/bash/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/bash/README.md
-README.md: e60ad9b0e4c48cf35a2601e7dec4d2d50807707b
-README.zh.md: deb23ea820de40c99f0affd3726d9a49857039ea
+README.md: ef82e9f4684ecf551ac7701d812088dd6b2ef6d0
+README.zh.md: 84ff244ec3d1ff5d385a3eb334e4cf9f1fe31e03

packages/bash/README.md

@@ -2,13 +2,16 @@
 
 English | [中文](README.zh.md)
 
-The canonical three-package capability seam (see [capability seams](../../.agents/notes/implemented/architecture/2026-06-13-capability-seams.md)): an abstract executor interface, concrete implementations, and the model-facing tool that consumes it. All **product** packages.
+The capability family spans the canonical executor seam, its implementations, the shared shell environment, and the model-facing tools. All **product** packages.
 
 | Package | Role | ctx key |
 |---|---|---|
 | `bash/` | Abstract bash executor seam (interface + vocabulary; sandbox result facts carry the [`sandbox/`](../sandbox/README.md) seam's mode/enforcement vocabulary, and the managed-env/output vocabulary is re-exported from the [`subprocess/`](../subprocess/README.md) seam) | `ctx.bash` |
 | `bash-local/` | Local `BashExecutor` implementation over the [`subprocess/`](../subprocess/README.md) service (command defaulting, deadlines, terminal env, background-read merge) | (registers `ctx.bash`) |
 | `bash-sandbox/` | Sandbox-consuming `BashExecutor` (wraps every command argv via `ctx.sandbox`, stamps denial/enforcement facts; extends `bash-local`'s mechanics) | (registers `ctx.bash`) |
+| `pwsh-local/` | Local PowerShell `BashExecutor` implementation over the [`subprocess/`](../subprocess/README.md) service (executable resolution, UTF-8-pinned spawn, Windows termination semantics) | (registers `ctx.bash`) |
+| `bash-env/` | Tool-independent managed `DSH_*` shell environment registry shared by the shell tools (built-in facts + effect-scoped contributors) | (registers `ctx.bashEnv`) |
 | `tool-bash/` | Model-facing `bash` schema; background processes register with the generic [`tasks/`](../tasks/README.md) runtime | (registers on `ctx.tools`) |
+| `tool-pwsh/` | Model-facing PowerShell-dialect `pwsh` schema (behavior mirrors `tool-bash` minus the sandbox surface); background processes register with the generic [`tasks/`](../tasks/README.md) runtime | (registers on `ctx.tools`) |
 
 The interface lives at `bash/bash/`. `bash-sandbox` replacing `bash-local` without touching the interface or the tool is the split doing exactly what it exists for — a leaf `cordis.yml` picks one executor entry, plus a `ctx.sandbox` provider entry for the confined one (see [the acp-agent example's default composition](../../examples/acp-agent/)).

packages/bash/README.zh.md

@@ -2,13 +2,16 @@
 
 [English](README.md) | 中文
 
-规范的三包能力 seam（见[能力 seam](../../.agents/notes/implemented/architecture/2026-06-13-capability-seams.md)）：抽象执行器接口、具体实现，以及消费该接口的面向模型工具。这些全是**产品**包。
+能力家族横跨规范执行器 seam、其实现、共享 shell 环境与面向模型的工具。这些全是**产品**包。
 
 | 包 | 职责 | ctx key |
 |---|---|---|
 | `bash/` | 抽象 bash 执行器 seam（接口 + 词汇；沙箱结果事实携带 [`sandbox/`](../sandbox/README.md) seam 的模式／强制执行词汇，受管环境／输出词汇则从 [`subprocess/`](../subprocess/README.md) seam 重导出） | `ctx.bash` |
 | `bash-local/` | 构建在 [`subprocess/`](../subprocess/README.md) 服务之上的本地 `BashExecutor` 实现（命令默认值补全、deadline、终端环境、后台读取合并） | （注册 `ctx.bash`） |
 | `bash-sandbox/` | 消费沙箱的 `BashExecutor`（通过 `ctx.sandbox` 包装每个命令 argv，标记拒绝／强制执行事实；扩展 `bash-local` 的机制） | （注册 `ctx.bash`） |
+| `pwsh-local/` | 构建在 [`subprocess/`](../subprocess/README.md) 服务之上的本地 PowerShell `BashExecutor` 实现（可执行文件解析、UTF-8 固定 spawn、Windows 终止语义） | （注册 `ctx.bash`） |
+| `bash-env/` | 工具无关的受管 `DSH_*` shell 环境注册表，由 shell 工具共享（内置事实 + 受 effect 作用域约束的 contributor） | （注册 `ctx.bashEnv`） |
 | `tool-bash/` | 面向模型的 `bash` schema；后台进程注册到通用 [`tasks/`](../tasks/README.md) 运行时 | （注册到 `ctx.tools`） |
+| `tool-pwsh/` | 面向模型的 PowerShell 方言 `pwsh` schema（行为镜像 `tool-bash`，减去 sandbox 面）；后台进程注册到通用 [`tasks/`](../tasks/README.md) 运行时 | （注册到 `ctx.tools`） |
 
 接口位于 `bash/bash/`。以 `bash-sandbox` 替换 `bash-local`，同时不改动接口或工具，正是这种拆分存在的意义：叶级 `cordis.yml` 选择一个执行器插件条目；受限实现还需再选择一个 `ctx.sandbox` 提供方插件条目（见 [acp-agent 示例的默认组合](../../examples/acp-agent/)）。

packages/bash/bash-env/README.i18n.yaml

@@ -0,0 +1,6 @@
+# Bilingual-pair consistency record (docs/i18n/README.md): the git blob hash of each
+# side as of the last confirmed-consistent state. Both languages carry equal authority;
+# after editing either side, bring the other along and re-record with:
+#   pnpm run verify-translation-pairing --write packages/bash/bash-env/README.md
+README.md: 7b939326d4effd14fc83ef0ad4e133f019f1011f
+README.zh.md: aeb33629def3fcc10294bbca19b37d43dcc73a0c

packages/bash/bash-env/README.md

@@ -0,0 +1,51 @@
+# @deepseek-ai/dsh-bash-env
+
+English | [中文](README.zh.md)
+
+The tool-independent shell environment plugin: owns the `ctx.bashEnv` registry of trusted, per-execution `DSH_*` variables that the model-facing shell tools (`dsh-tool-bash`, `dsh-tool-pwsh`) collect into every shell call's environment. Built-in shell facts (`DSH_HOME`, `DSH_SHELL=1`, `DSH_SESSION_ID`) are owned by the registry itself; other plugins register additional enumerable facts with effect-scoped disposal, and duplicate ownership or undeclared runtime keys fail loudly.
+
+The package root exports the Cordis plugin contract (`name`, `inject`, `Config`, `apply`) plus the `BashEnvRegistry` service class and its contributor types; consumers use `ctx.bashEnv` after loading this plugin.
+
+## Config
+
+```yaml
+- id: bash-env
+  name: '@deepseek-ai/dsh-bash-env'
+  config:
+    dshHome: C:\Users\me\.dsh   # default: $DSH_HOME, then ~/.dsh
+```
+
+## Managed environment
+
+Every foreground and background model shell call receives a newly collected trusted `DSH_*` environment. `DSH_HOME` is the absolute Harness home resolved by [`@deepseek-ai/dsh-paths`](../../util/paths/README.md) (`dshHome` config, then ambient `$DSH_HOME`, then `~/.dsh`) and `DSH_SHELL=1` identifies the managed child. Agent calls additionally receive `DSH_SESSION_ID=agent.session.header.id`; when the active persistence seam locates a JSONL artifact they also receive `DSH_SESSION_JSONL=<absolute target path>`. The JSONL path is a location hint: it may not exist before the first flush or contain the current buffered turn, and it is not an authorization credential.
+
+`ctx.bashEnv` owns collection. Other plugins can register an effect-scoped contributor with a stable name, declared keys/descriptions, and `resolve(execution: ToolExecution)`; duplicate ownership and undeclared runtime keys fail loudly, while `list()` enumerates declarations without executing providers. Harness built-ins reserve `DSH_HOME`, `DSH_SHELL`, and `DSH_SESSION_ID`; this plugin's persistence translator owns `DSH_SESSION_JSONL` by reading the backend-neutral `sessionPersistence.locate()` seam.
+
+```ts
+import type { Context } from 'cordis'
+import type {} from '@deepseek-ai/dsh-bash-env'
+
+export const inject = ['bashEnv']
+
+export function apply(ctx: Context): void {
+  ctx.bashEnv.register({
+    name: 'deployment-region',
+    variables: { DSH_DEPLOYMENT_REGION: { description: 'Current deployment region.' } },
+    resolve: execution => execution.agent === undefined ? {} : { DSH_DEPLOYMENT_REGION: 'cn-north' },
+  })
+}
+```
+
+The overlay is computed from the current `ToolExecution` and passed through the dedicated `BashExecRequest.dshEnv` channel. The local executors remove all inherited `DSH_*` before merging that snapshot, so nested harnesses and concurrent parent/child agents cannot leak stale identities. `process.env` is never modified. The shell tools' descriptions teach the generic `$DSH_*` convention rather than naming persistence-specific variables or adding a permanent system-prompt section.
+
+## Model Experience
+
+Indirectly, through the shell tools (`dsh-tool-bash`, `dsh-tool-pwsh`), which collect this registry's managed `DSH_*` snapshot into every shell-tool call.
+
+#### KV Cache effect
+
+No direct invalidation; the named consumers own any request-prefix changes.
+
+## Known Limitations and Deferred Work
+
+- **`list()` enumerates contributor-declared variables only** — registry-owned built-ins (`DSH_HOME`, `DSH_SHELL`, `DSH_SESSION_ID`) are not included, so diagnostics, prompt, or UI code must not treat `list()` as an exhaustive environment catalog.

packages/bash/bash-env/README.zh.md

@@ -0,0 +1,51 @@
+# @deepseek-ai/dsh-bash-env
+
+[English](README.md) | 中文
+
+工具无关的 shell 环境插件：拥有 `ctx.bashEnv` 注册表，管理受信任的、每次执行收集的 `DSH_*` 变量，供模型可见的 shell 工具（`dsh-tool-bash`、`dsh-tool-pwsh`）收集进每次 shell 调用的环境。内置 shell 事实（`DSH_HOME`、`DSH_SHELL=1`、`DSH_SESSION_ID`）归注册表自身所有；其他插件可以注册额外的可枚举事实，注册随插件纤维（fiber）释放，重复所有权或未声明的运行时键会响亮失败。
+
+包根导出 Cordis 插件契约（`name`、`inject`、`Config`、`apply`）以及 `BashEnvRegistry` 服务类及其 contributor 类型；消费者在加载本插件后使用 `ctx.bashEnv`。
+
+## Config
+
+```yaml
+- id: bash-env
+  name: '@deepseek-ai/dsh-bash-env'
+  config:
+    dshHome: C:\Users\me\.dsh   # default: $DSH_HOME, then ~/.dsh
+```
+
+## Managed environment
+
+每次前台与后台模型 shell 调用都会收到一份新收集的受信任 `DSH_*` 环境。`DSH_HOME` 是由 [`@deepseek-ai/dsh-paths`](../../util/paths/README.md) 解析的 Harness 主目录绝对路径（`dshHome` 配置，然后环境变量 `$DSH_HOME`，然后 `~/.dsh`），`DSH_SHELL=1` 标识受管理的子进程。带 agent 的调用额外收到 `DSH_SESSION_ID=agent.session.header.id`；当活动的持久化 seam 定位到 JSONL 工件时，它们还会收到 `DSH_SESSION_JSONL=<绝对目标路径>`。JSONL 路径只是位置提示：首次 flush 之前它可能不存在，也不一定包含当前缓冲中的轮次，并且它不是授权凭据。
+
+`ctx.bashEnv` 负责收集。其他插件可以注册一个受 effect 作用域约束的 contributor，带有稳定名称、已声明的键/描述以及 `resolve(execution: ToolExecution)`；重复所有权与未声明的运行时键会响亮失败，而 `list()` 只枚举声明、不执行 provider。Harness 内置键保留 `DSH_HOME`、`DSH_SHELL` 与 `DSH_SESSION_ID`；本插件的持久化翻译器通过读取与后端无关的 `sessionPersistence.locate()` seam 拥有 `DSH_SESSION_JSONL`。
+
+```ts
+import type { Context } from 'cordis'
+import type {} from '@deepseek-ai/dsh-bash-env'
+
+export const inject = ['bashEnv']
+
+export function apply(ctx: Context): void {
+  ctx.bashEnv.register({
+    name: 'deployment-region',
+    variables: { DSH_DEPLOYMENT_REGION: { description: 'Current deployment region.' } },
+    resolve: execution => execution.agent === undefined ? {} : { DSH_DEPLOYMENT_REGION: 'cn-north' },
+  })
+}
+```
+
+覆盖层根据当前 `ToolExecution` 计算，并通过专用的 `BashExecRequest.dshEnv` 通道传递。本地执行器在合并该快照前移除所有继承的 `DSH_*`，因此嵌套 harness 与并发的父子 agent 无法泄漏过期的身份。`process.env` 永不被修改。shell 工具的描述只教授通用的 `$DSH_*` 约定，而不是点名持久化相关的变量或添加常驻的 system-prompt 段落。
+
+## Model Experience
+
+Indirectly, through the shell tools (`dsh-tool-bash`, `dsh-tool-pwsh`), which collect this registry's managed `DSH_*` snapshot into every shell-tool call.
+
+#### KV Cache effect
+
+No direct invalidation; the named consumers own any request-prefix changes.
+
+## Known Limitations and Deferred Work
+
+- **`list()` 只枚举 contributor 声明的变量** — 注册表自有的内置键（`DSH_HOME`、`DSH_SHELL`、`DSH_SESSION_ID`）不包含在内，因此诊断、prompt 或 UI 代码不得把 `list()` 当作完整的环境目录。

packages/bash/bash-env/package.json

@@ -0,0 +1,50 @@
+{
+  "name": "@deepseek-ai/dsh-bash-env",
+  "description": "Tool-independent managed DSH_* shell environment registry",
+  "version": "0.0.1",
+  "private": true,
+  "type": "module",
+  "main": "lib/index.js",
+  "types": "lib/types/index.d.ts",
+  "exports": {
+    ".": {
+      "types": "./lib/types/index.d.ts",
+      "default": "./lib/index.js"
+    },
+    "./invariant": {
+      "types": "./lib/types/invariant.d.ts",
+      "default": "./lib/invariant.js"
+    },
+    "./src/*": "./src/*",
+    "./package.json": "./package.json"
+  },
+  "files": [
+    "lib/index.js",
+    "lib/invariant.js",
+    "lib/types/**/*.d.ts",
+    "lib/types/**/*.d.ts.map",
+    "src"
+  ],
+  "license": "BSD-3-Clause",
+  "peerDependencies": {
+    "@deepseek-ai/dsh-bash": "^0.0.1",
+    "@deepseek-ai/dsh-invariants": "^0.0.1",
+    "@deepseek-ai/dsh-paths": "^0.0.1",
+    "@deepseek-ai/dsh-session-persistence": "^0.0.1",
+    "@deepseek-ai/dsh-tools": "^0.0.1",
+    "cordis": "^4.0.0-rc.7"
+  },
+  "dependencies": {
+    "schemastery": "^3.18.0"
+  },
+  "devDependencies": {
+    "@deepseek-ai/dsh-agent": "workspace:^",
+    "@deepseek-ai/dsh-bash": "workspace:^",
+    "@deepseek-ai/dsh-invariants": "workspace:^",
+    "@deepseek-ai/dsh-llm": "workspace:^",
+    "@deepseek-ai/dsh-paths": "workspace:^",
+    "@deepseek-ai/dsh-session-persistence": "workspace:^",
+    "@deepseek-ai/dsh-tools": "workspace:^",
+    "cordis": "^4.0.0-rc.7"
+  }
+}

packages/bash/bash-env/src/index.ts

@@ -0,0 +1,217 @@
+/**
+ * Tool-independent shell environment plugin: owns the `ctx.bashEnv` registry of
+ * trusted, per-execution `DSH_*` variables consumed by the model-facing shell
+ * tools (`dsh-tool-bash`, `dsh-tool-pwsh`). Built-in shell facts are owned by
+ * the registry itself while plugins can register additional, enumerable facts
+ * with effect-scoped disposal.
+ *
+ * @module @deepseek-ai/dsh-bash-env
+ */
+
+import { Service, type Context } from 'cordis'
+import z from 'schemastery'
+import { DSH_ENV_PREFIX } from '@deepseek-ai/dsh-bash'
+import type { DshEnvironment, DshEnvironmentKey } from '@deepseek-ai/dsh-bash'
+import { DSH_HOME_ENV, resolveDshHome } from '@deepseek-ai/dsh-paths'
+import type { ToolExecution } from '@deepseek-ai/dsh-tools'
+import type {} from '@deepseek-ai/dsh-session-persistence'
+
+declare module 'cordis' {
+  interface Context {
+    bashEnv: BashEnvRegistry
+  }
+}
+
+export const name = 'bash-env'
+export const inject: string[] = []
+
+/** Plugin config (all optional — the built-in facts resolve without defaults). */
+export interface Config {
+  /** DeepSeek Harness home directory exposed as `DSH_HOME`; defaults to `$DSH_HOME` or `~/.dsh`. */
+  dshHome?: string
+}
+
+/** Runtime configuration schema for the bash-env plugin. */
+export const Config: z<Config> = z.object({
+  dshHome: z.string(),
+})
+
+/** Model-visible metadata for one managed `DSH_*` environment variable. */
+export interface BashEnvVariable {
+  /** Concise description of the environment fact represented by the variable. */
+  description: string
+}
+
+/**
+ * A plugin contribution to the managed environment of each model shell call.
+ * Declared keys make ownership conflicts detectable before the first command;
+ * `resolve` computes only the values available for the current execution.
+ */
+export interface BashEnvContributor {
+  /** Stable contributor name used in diagnostics and duplicate detection. */
+  name: string
+  /** Complete set of `DSH_*` keys this contributor may return. */
+  variables: Readonly<Record<DshEnvironmentKey, BashEnvVariable>>
+  /**
+   * Resolve this contributor's available values for one tool execution.
+   * @param execution - the shell tool execution and its optional calling agent.
+   * @returns a partial map containing only keys declared in {@link variables}.
+   */
+  resolve(execution: ToolExecution): Readonly<Partial<Record<DshEnvironmentKey, string>>>
+}
+
+/** An enumerable declaration returned by {@link BashEnvRegistry.list}. */
+export interface BashEnvVariableInfo extends BashEnvVariable {
+  /** Contributor that owns the variable. */
+  contributor: string
+  /** Declared `DSH_*` environment variable name. */
+  key: DshEnvironmentKey
+}
+
+const DSH_SHELL_KEY = `${DSH_ENV_PREFIX}SHELL` as const
+const DSH_SESSION_ID_KEY = `${DSH_ENV_PREFIX}SESSION_ID` as const
+const DSH_SESSION_JSONL_KEY = `${DSH_ENV_PREFIX}SESSION_JSONL` as const
+const RESERVED_BASH_ENV_KEYS = new Set<DshEnvironmentKey>([
+  DSH_HOME_ENV,
+  DSH_SHELL_KEY,
+  DSH_SESSION_ID_KEY,
+])
+const BASH_ENV_KEY_SUFFIX = /^[A-Z][A-Z0-9_]*$/
+
+/**
+ * Registry (`ctx.bashEnv`) for trusted, per-execution `DSH_*` variables.
+ * The namespace is rebuilt for every model shell call: ambient `DSH_*` values
+ * are discarded by the executor, then the registry's current snapshot is
+ * injected. Built-in shell facts remain owned by the registry itself while
+ * plugins can register additional, enumerable facts with effect-scoped
+ * disposal.
+ */
+export class BashEnvRegistry extends Service {
+  private readonly contributors = new Map<string, BashEnvContributor>()
+  private readonly keyOwners = new Map<DshEnvironmentKey, string>()
+  private readonly dshHome: string
+
+  /**
+   * Create and install the `ctx.bashEnv` service.
+   * @param ctx - Cordis context that owns the service and registrations.
+   * @param config - home-directory configuration for the built-in variables.
+   */
+  constructor(ctx: Context, config: Config = {}) {
+    super(ctx, 'bashEnv')
+    this.dshHome = resolveDshHome(config.dshHome)
+  }
+
+  /**
+   * Register one environment contributor. Names and keys are unique; built-in
+   * keys are reserved. Registration is disposed with the calling plugin fiber.
+   * @param contributor - declared key ownership and per-execution resolver.
+   * @returns the disposer that unregisters the contribution.
+   */
+  register(contributor: BashEnvContributor): () => void {
+    const dispose = this.ctx.effect(function* (this: BashEnvRegistry) {
+      if (contributor.name.trim().length === 0) {
+        throw new Error('bash env contributor name must be non-empty')
+      }
+      if (this.contributors.has(contributor.name)) {
+        throw new Error(`bash env contributor "${contributor.name}" is already registered`)
+      }
+
+      const variables = Object.entries(contributor.variables) as [DshEnvironmentKey, BashEnvVariable][]
+      for (const [key, variable] of variables) {
+        if (!key.startsWith(DSH_ENV_PREFIX)
+          || !BASH_ENV_KEY_SUFFIX.test(key.slice(DSH_ENV_PREFIX.length))) {
+          throw new Error(`bash env contributor "${contributor.name}" declared invalid key "${key}"`)
+        }
+        if (RESERVED_BASH_ENV_KEYS.has(key)) {
+          throw new Error(`bash env contributor "${contributor.name}" cannot own reserved key "${key}"`)
+        }
+        if (variable.description.trim().length === 0) {
+          throw new Error(`bash env contributor "${contributor.name}" must describe "${key}"`)
+        }
+        const owner = this.keyOwners.get(key)
+        if (owner !== undefined) {
+          throw new Error(`bash env key "${key}" is already owned by contributor "${owner}"; contributor "${contributor.name}" cannot also own it`)
+        }
+      }
+
+      this.contributors.set(contributor.name, contributor)
+      for (const [key] of variables) this.keyOwners.set(key, contributor.name)
+      yield () => {
+        this.contributors.delete(contributor.name)
+        for (const [key] of variables) this.keyOwners.delete(key)
+      }
+    }.bind(this), 'bashEnv.register()')
+    return () => void dispose()
+  }
+
+  /**
+   * Build the trusted `DSH_*` snapshot for one shell tool execution.
+   * @param execution - the current tool execution.
+   * @returns an immutable environment overlay containing built-ins and current contributions.
+   */
+  collect(execution: ToolExecution): DshEnvironment {
+    const values: Record<DshEnvironmentKey, string> = {
+      [DSH_HOME_ENV]: this.dshHome,
+      [DSH_SHELL_KEY]: '1',
+    }
+    if (execution.agent !== undefined) {
+      values[DSH_SESSION_ID_KEY] = execution.agent.session.header.id
+    }
+
+    for (const contributor of [...this.contributors.values()].sort((left, right) => left.name.localeCompare(right.name))) {
+      const resolved = contributor.resolve(execution)
+      for (const [rawKey, value] of Object.entries(resolved)) {
+        const key = rawKey as DshEnvironmentKey
+        if (!Object.hasOwn(contributor.variables, key)) {
+          throw new Error(`bash env contributor "${contributor.name}" returned undeclared key "${key}"`)
+        }
+        if (typeof value !== 'string') {
+          throw new Error(`bash env contributor "${contributor.name}" returned a non-string value for "${key}"`)
+        }
+        values[key] = value
+      }
+    }
+
+    return Object.freeze(Object.fromEntries(Object.entries(values).sort(([left], [right]) => left.localeCompare(right))))
+  }
+
+  // TODO(bash-env-list-builtins): Include registry-owned built-ins before diagnostics,
+  // prompt, or UI code treats list() as an exhaustive environment catalog.
+  /**
+   * Enumerate plugin-contributed variables without executing their resolvers.
+   * @returns declarations sorted by environment variable name.
+   */
+  list(): BashEnvVariableInfo[] {
+    return [...this.contributors.values()]
+      .flatMap(contributor => Object.entries(contributor.variables).map(([key, variable]) => ({
+        contributor: contributor.name,
+        description: variable.description,
+        key: key as DshEnvironmentKey,
+      })))
+      .sort((left, right) => left.key.localeCompare(right.key))
+  }
+}
+
+/**
+ * Load the bash-env plugin: register the `ctx.bashEnv` service and the
+ * shell-agnostic persistence contributor (`DSH_SESSION_JSONL`).
+ * @param ctx - Cordis context that owns the service and registrations.
+ * @param config - home-directory configuration for the built-in variables.
+ */
+export function apply(ctx: Context, config: Config = {}): void {
+  const registry = new BashEnvRegistry(ctx, config)
+  registry.register({
+    name: 'session-persistence',
+    variables: {
+      [DSH_SESSION_JSONL_KEY]: {
+        description: 'Absolute target path of the current session JSONL when the active persistence backend provides one.',
+      },
+    },
+    resolve(execution) {
+      const agent = execution.agent
+      if (agent === undefined) return {}
+      const location = ctx.get('sessionPersistence')?.locate(agent.session.header)
+      return location?.kind === 'jsonl' ? { [DSH_SESSION_JSONL_KEY]: location.path } : {}
+    },
+  })
+}

packages/bash/bash-env/src/invariant.ts

@@ -0,0 +1,30 @@
+/**
+ * Package-owned invariant companion for `@deepseek-ai/dsh-bash-env`.
+ * @module @deepseek-ai/dsh-bash-env/invariant
+ */
+
+/* jscpd:ignore-start */
+import type { Context } from 'cordis'
+import type { InvariantInstaller } from '@deepseek-ai/dsh-invariants'
+
+const PACKAGE_NAME = '@deepseek-ai/dsh-bash-env'
+
+/** Cordis companion plugin name. */
+export const name = 'bash-env-invariant'
+/** Service required before the companion can reserve package ownership. */
+export const inject = ['invariants']
+
+/**
+ * No runtime invariant: the environment registry validates ownership and collected values at each
+ * registration/collection; it publishes no independent snapshot that a companion could cross-check.
+ */
+const install: InvariantInstaller = () => {}
+
+/**
+ * Register this package's invariant companion.
+ * @param ctx - Cordis context carrying the invariant service.
+ * @returns the installed registration's disposer after setup succeeds.
+ */
+export const apply = (ctx: Context): Promise<() => void> =>
+  Promise.resolve(ctx.invariants.register(PACKAGE_NAME, install))
+/* jscpd:ignore-end */

packages/bash/bash-env/tests/bash-env.spec.ts

@@ -1,3 +1,9 @@
+/**
+ * Registry tests for `@deepseek-ai/dsh-bash-env`: built-in facts, contributor
+ * ownership and validation, collection ordering, effect-scoped disposal, and
+ * the explicit disposer contract.
+ */
+
 import { homedir } from 'node:os'
 import { join, resolve } from 'node:path'
 import { afterEach, describe, expect, it, vi } from 'vitest'
@@ -5,7 +11,8 @@ import { Context } from 'cordis'
 import { CallId } from '@deepseek-ai/dsh-llm'
 import type { Agent } from '@deepseek-ai/dsh-agent'
 import type { ToolExecution } from '@deepseek-ai/dsh-tools'
-import { BashEnvRegistry } from '@deepseek-ai/dsh-tool-bash'
+import { BashEnvRegistry } from '@deepseek-ai/dsh-bash-env'
+import * as BashEnvPlugin from '@deepseek-ai/dsh-bash-env'
 
 const testToolSignal = new AbortController().signal
 
@@ -190,4 +197,41 @@ describe('BashEnvRegistry', () => {
     dispose()
     expect(registry.collect(execution())).not.toHaveProperty('DSH_EXPLICIT_DISPOSAL')
   })
+
+  it('the plugin registers the service and the persistence contributor on load', async () => {
+    const ctx = new Context()
+    await ctx.plugin(BashEnvPlugin)
+    expect(ctx.bashEnv).toBeInstanceOf(BashEnvRegistry)
+    expect(ctx.bashEnv.list()).toEqual([
+      {
+        contributor: 'session-persistence',
+        description: 'Absolute target path of the current session JSONL when the active persistence backend provides one.',
+        key: 'DSH_SESSION_JSONL',
+      },
+    ])
+  })
+
+  it('the persistence contributor resolves DSH_SESSION_JSONL only for a jsonl backend', async () => {
+    const ctx = new Context()
+    await ctx.plugin(BashEnvPlugin)
+    ctx.provide('sessionPersistence', {
+      locate: () => ({ kind: 'jsonl' as const, path: 'C:\\sessions\\s.jsonl' }),
+    })
+    expect(ctx.bashEnv.collect(execution('sess-p')).DSH_SESSION_JSONL).toBe('C:\\sessions\\s.jsonl')
+  })
+
+  it('the persistence contributor omits the variable for a non-jsonl backend', async () => {
+    const ctx = new Context()
+    await ctx.plugin(BashEnvPlugin)
+    ctx.provide('sessionPersistence', {
+      locate: () => ({ kind: 'sqlite' as const, path: 'C:\\sessions\\s.db' }),
+    })
+    expect(ctx.bashEnv.collect(execution('sess-p'))).not.toHaveProperty('DSH_SESSION_JSONL')
+  })
+
+  it('the persistence contributor omits the variable without a persistence backend', async () => {
+    const ctx = new Context()
+    await ctx.plugin(BashEnvPlugin)
+    expect(ctx.bashEnv.collect(execution('sess-p'))).not.toHaveProperty('DSH_SESSION_JSONL')
+  })
 })

packages/bash/bash-env/tsconfig.json

@@ -0,0 +1,36 @@
+{
+  "extends": "../../../tsconfig.base.json",
+  "compilerOptions": {
+    "rootDir": "src",
+    "outDir": "lib/types"
+  },
+  "include": [
+    "src"
+  ],
+  "references": [
+    {
+      "path": "../../../vendor/cosmokit"
+    },
+    {
+      "path": "../../../vendor/cordis"
+    },
+    {
+      "path": "../../../vendor/schemastery"
+    },
+    {
+      "path": "../../bash/bash"
+    },
+    {
+      "path": "../../util/paths"
+    },
+    {
+      "path": "../../core/tools"
+    },
+    {
+      "path": "../../session-persistence/session-persistence"
+    },
+    {
+      "path": "../../support/invariants"
+    }
+  ]
+}

packages/bash/pwsh-local/README.i18n.yaml

@@ -0,0 +1,6 @@
+# Bilingual-pair consistency record (docs/i18n/README.md): the git blob hash of each
+# side as of the last confirmed-consistent state. Both languages carry equal authority;
+# after editing either side, bring the other along and re-record with:
+#   pnpm run verify-translation-pairing --write packages/bash/pwsh-local/README.md
+README.md: 9deba9c1b63ccfdb9e1805b9896db33f144839bf
+README.zh.md: e45c820e1d5e31aebd9ed365c6130850f1db2a62

packages/bash/pwsh-local/README.md

@@ -0,0 +1,56 @@
+# @deepseek-ai/dsh-pwsh-local
+
+English | [中文](README.zh.md)
+
+Local PowerShell implementation of the `@deepseek-ai/dsh-bash` executor seam over the [`@deepseek-ai/dsh-subprocess`](../../subprocess/subprocess/README.md) service: `PwshLocalExecutor` spawns `pwsh -NoLogo -NoProfile -NonInteractive -Command <command>` per call as a managed process through `ctx.subprocess`, and owns everything PowerShell-shaped — executable resolution, command defaulting and caps, timeout/cancel classification, the model-friendly terminal environment, and the model-facing stdout/stderr merge for background reads. Group mechanics (bounded spill-backed output, credential scrub, kill escalation, disposal) are the subprocess service's.
+
+The command string rides as ONE argv element to `-Command`: PowerShell itself parses the text, and no intermediate shell exists, so there is no shell-quoting layer to escape (the `bash -c` string domain has no equivalent here). Native Win32 paths (`C:\...`) pass through unchanged.
+
+The package root exports the default and named `PwshLocalExecutor` plugin, its `Config`, the pure `resolvePwshPath`/`candidatePwshPaths` helpers, and the `ENV_OVERRIDES`/`ENCODING_PREAMBLE` constants the executor injects into every spawn.
+
+## Config
+
+```yaml
+- id: bash
+  name: '@deepseek-ai/dsh-pwsh-local'
+  config:
+    cwd: C:\path\to\workspace   # default: process.cwd()
+    timeoutMs: 120000           # default foreground timeout
+    maxTimeoutMs: 600000        # cap for per-call overrides
+    maxOutputBytes: 64000       # per-stream in-memory cap; overflow spills to disk
+    maxSpillBytes: 67108864     # per-stream full-output spill cap
+    graceMs: 3000               # kill escalation and post-exit pipe-drain grace
+    pwshPath: C:\Program Files\PowerShell\7\pwsh.exe  # explicit executable; else well-known locations, then PATH
+```
+
+## Behavior (and where it came from)
+
+The Windows counterpart of `dsh-bash-local`, deliberately mirroring its semantics call-for-call:
+
+- **Spawn per call, no shell state** — every call is a fresh non-interactive `pwsh -Command` (deterministic; no profile files). The `-NoLogo -NoProfile -NonInteractive` flags disable startup banners, profile loading, and prompts that would garble tool output.
+- **UTF-8 output pinned** — every command runs with `[Console]::OutputEncoding` and `$OutputEncoding` set to UTF-8 first, so the Windows PowerShell 5.1 fallback (or any host whose console code page is not UTF-8) cannot garble non-ASCII output: the subprocess collector decodes bytes as UTF-8. Input encoding is left at the host default; pwsh 7 defaults to UTF-8 and is unaffected.
+- **Executable resolution** — `resolvePwshPath` prefers an explicit `pwshPath`, then on Windows probes PowerShell 7's install location, every PATH entry (Microsoft Store installs; surrounding quotes stripped), and Windows PowerShell 5.1 as a legacy last resort, checking `existsSync` on each; elsewhere it falls back to a bare `pwsh` resolved through PATH. Resolution is a pure function of `(configured, env, platform)` and happens once at construction.
+- **Configured budgets over managed groups** — `resolve()` fills `workdir`/`timeoutMs`/`stdoutMaxBytes` from config, and every spawn hands the service explicit byte caps, spill cap, and `graceMs`. Tree termination (taskkill on Windows, process-group signals on POSIX), the post-exit pipe-drain grace, tail-keep truncation, and bounded spill files are [`dsh-subprocess-local`](../../subprocess/subprocess-local/README.md) mechanics. A foreground `BashExecRequest.stdoutMaxBytes` can raise stdout's capture budget for one trusted caller; stderr and background runs still use `maxOutputBytes`.
+- **Timeout and cancel classification** — `run()` fuses its config-clamped timeout with the caller's signal through one deadline; only the executor's own timeout reports `timedOut`, an upstream cancel reports `aborted`, and a self-terminated command reports neither ([timeout-library Agent Note](../../../.agents/notes/implemented/architecture/2026-07-06-timeout-deadline-library.md)). Windows reports forced termination as exit 1 without a signal, so signal-stamped facts (`signal`, `killed` status) are POSIX-only there; the timeout/abort classification is platform-independent.
+- **Model-friendly terminal env** — `NO_COLOR=1 PAGER=cat GIT_PAGER=cat` (no `TERM=dumb`: that is a POSIX concept; `NO_COLOR` is honored by modern PowerShell renderers) merged as ordinary env under the service's credential scrub and `DSH_*` channel rules; an explicit caller entry still wins.
+- **Background processes** — `start()` returns a live `BashProcess` handle immediately, no timeout applies, and the handle's `readOutput()` merges the service's offset-based stdout/stderr reads into one marked-section delta with a consuming cursor. A still-running process belongs to the subprocess service, so it survives executor reloads and dies (killed and joined) with the service's disposal. Everything task-shaped (ids, ownership, polling, notices) lives in the generic [`ctx.tasks` runtime](../../tasks/tasks/README.md), which the tool layer registers the handle with — this executor never sees a session or a registry.
+
+## Model Experience
+
+Indirectly, through `dsh-tool-pwsh`, which renders this executor's bounded stdout/stderr tails, background-process deltas (through the generic task runtime), spill-file paths, and infrastructure failures.
+
+#### KV Cache effect
+
+No direct invalidation; the named consumer owns any request-prefix changes.
+
+## Known Limitations and Deferred Work
+
+- **Unconfined by itself** — this executor always runs commands with the harness process's authority; deployments needing confinement compose a sandboxing bash executor or policy instead.
+- **No persistent shell or PTY** — every call starts a fresh `pwsh -Command`; interactive terminal sessions remain deferred until the roadmap's pwsh TUI/GUI rendering work lands.
+- **The command string is PowerShell text** — the `-Command` domain has no shell-quoting layer, but a model-facing command is parsed by PowerShell itself, so PowerShell syntax errors are command failures, not launch failures.
+- **A background spawn-failure note is single-delivery** — the subprocess service buffers no output for a process that never ran, so the executor injects `spawn failed: …` into exactly one `readOutput()` delta; a reader that discards that delta cannot recover it.
+- **Windows termination reports no signal** — a force-killed process settles as exit 1 with `signal: null`, so signal-based status classification (POSIX `killed`) does not apply on Windows; `kill()`-initiated stops still stamp `killed` directly.
+- **The encoding preamble precedes the command** — PowerShell requires `param(...)`, `#requires`, and `using namespace`/`using assembly` statements at the very top of a script, so a command whose first statement is one of those cannot run under the UTF-8 output preamble. Wrap a `param(...)` script in `& { … }` (a param block legally heads a script block); `using` statements and `#requires` have no in-command workaround (`#requires` is inert inside `-Command` regardless of position) — run such scripts from a file instead.
+- **Non-ASCII stdin under Windows PowerShell 5.1 may be mis-decoded** — the preamble pins output encoding only; `[Console]::InputEncoding` stays at the host default because setting it under redirected stdin throws. pwsh 7 defaults to UTF-8 and is unaffected.
+
+Scrub-heuristic and spill-retention caveats live with [`dsh-subprocess-local`](../../subprocess/subprocess-local/README.md), which owns those mechanics.

packages/bash/pwsh-local/README.zh.md

@@ -0,0 +1,56 @@
+# @deepseek-ai/dsh-pwsh-local
+
+[English](README.md) | 中文
+
+`@deepseek-ai/dsh-bash` 执行器 seam 的本地 PowerShell 实现，基于 [`@deepseek-ai/dsh-subprocess`](../../subprocess/subprocess/README.md) 服务：`PwshLocalExecutor` 每次调用以受管进程的方式通过 `ctx.subprocess` spawn `pwsh -NoLogo -NoProfile -NonInteractive -Command <command>`，并拥有所有 PowerShell 形状的职责——可执行文件解析、命令默认化与上限、超时/取消分类、面向模型的终端环境，以及后台读取的 stdout/stderr 合并。进程组机制（有界 spill 输出、凭据清理、终止升级、销毁）属于 subprocess 服务。
+
+命令字符串作为 ONE argv 元素传给 `-Command`：由 PowerShell 自己解析文本，不存在中间 shell，因此没有需要转义的 shell 引号层（`bash -c` 字符串域在这里没有对应物）。原生 Win32 路径（`C:\...`）原样通过。
+
+包根导出默认与具名 `PwshLocalExecutor` 插件、其 `Config`、纯函数 `resolvePwshPath`/`candidatePwshPaths` 辅助函数，以及执行器注入每次 spawn 的 `ENV_OVERRIDES`/`ENCODING_PREAMBLE` 常量。
+
+## 配置
+
+```yaml
+- id: bash
+  name: '@deepseek-ai/dsh-pwsh-local'
+  config:
+    cwd: C:\path\to\workspace   # default: process.cwd()
+    timeoutMs: 120000           # default foreground timeout
+    maxTimeoutMs: 600000        # cap for per-call overrides
+    maxOutputBytes: 64000       # per-stream in-memory cap; overflow spills to disk
+    maxSpillBytes: 67108864     # per-stream full-output spill cap
+    graceMs: 3000               # kill escalation and post-exit pipe-drain grace
+    pwshPath: C:\Program Files\PowerShell\7\pwsh.exe  # explicit executable; else well-known locations, then PATH
+```
+
+## 行为（及其由来）
+
+作为 `dsh-bash-local` 的 Windows 对应物，逐调用地镜像其语义：
+
+- **每次调用新建进程，无 shell 状态**——每次调用都是全新的非交互 `pwsh -Command`（确定性；不加载 profile 文件）。`-NoLogo -NoProfile -NonInteractive` 关闭启动横幅、profile 加载与会干扰工具输出的提示符。
+- **UTF-8 输出固定**——每条命令都先以 UTF-8 设置 `[Console]::OutputEncoding` 与 `$OutputEncoding`，因此 Windows PowerShell 5.1 兜底（或任何控制台代码页非 UTF-8 的主机）不会破坏非 ASCII 输出：subprocess collector 以 UTF-8 解码字节。输入编码保持宿主默认；pwsh 7 默认为 UTF-8，不受影响。
+- **可执行文件解析**——`resolvePwshPath` 优先显式 `pwshPath`，然后在 Windows 上依次探测 PowerShell 7 安装位置、每个 PATH 条目（Microsoft Store 安装；剥离两端引号）以及作为遗留兜底的 Windows PowerShell 5.1，逐一检查 `existsSync`；其他平台回退为通过 PATH 解析的裸 `pwsh`。解析是 `(configured, env, platform)` 的纯函数，在构造时执行一次。
+- **受管进程组之上的配置预算**——`resolve()` 从配置填充 `workdir`/`timeoutMs`/`stdoutMaxBytes`，每次 spawn 都向服务提供显式字节上限、spill 上限与 `graceMs`。进程树终止（Windows 用 taskkill，POSIX 用进程组信号）、退出后管道排空宽限、保尾截断与有界 spill 文件是 [`dsh-subprocess-local`](../../subprocess/subprocess-local/README.md) 的机制。前台 `BashExecRequest.stdoutMaxBytes` 可为单个受信调用方提高 stdout 捕获预算；stderr 与后台运行仍使用 `maxOutputBytes`。
+- **超时与取消分类**——`run()` 通过一个 deadline 融合配置夹取的超时与调用方信号；只有执行器自身超时报告 `timedOut`，上游取消报告 `aborted`，自我终止的命令两者都不报告（见 [timeout 库 Agent Note](../../../.agents/notes/implemented/architecture/2026-07-06-timeout-deadline-library.md)）。Windows 将强制终止报告为退出码 1 且无信号，因此基于信号的实情（`signal`、`killed` 状态）在那里仅限 POSIX；超时/取消分类与平台无关。
+- **面向模型的终端环境**——`NO_COLOR=1 PAGER=cat GIT_PAGER=cat`（没有 `TERM=dumb`：那是 POSIX 概念；现代 PowerShell 渲染器遵循 `NO_COLOR`），作为普通 env 在服务的凭据清理与 `DSH_*` 通道规则之下合并；显式调用方条目仍然优先。
+- **后台进程**——`start()` 立即返回存活的 `BashProcess` 句柄，不设超时；句柄的 `readOutput()` 把服务基于偏移的 stdout/stderr 读取合并为带标记分段的增量与消费游标。仍在运行的进程属于 subprocess 服务，因此它跨执行器重载存活，并随服务销毁（被终止并 join）。一切任务形状的职责（id、所有权、轮询、通知）都在通用 [`ctx.tasks` 运行时](../../tasks/tasks/README.md) 中，由工具层把句柄注册进去——本执行器从不接触会话或注册表。
+
+## 模型体验
+
+间接地，经由 `dsh-tool-pwsh` 呈现本执行器的有界 stdout/stderr 尾部、后台进程增量（经通用任务运行时）、spill 文件路径与基础设施失败。
+
+#### KV Cache 影响
+
+无直接失效；具名消费方拥有请求前缀的任何变更。
+
+## 已知局限与延期工作
+
+- **自身不设沙箱**——本执行器始终以 harness 进程的权限运行命令；需要约束的部署应组合沙箱化 bash 执行器或策略。
+- **无持久 shell 或 PTY**——每次调用都是全新的 `pwsh -Command`；交互式终端会话在路线图的 pwsh TUI/GUI 渲染工作落地之前保持延期。
+- **命令字符串是 PowerShell 文本**——`-Command` 域没有 shell 引号层，但面向模型的命令由 PowerShell 自己解析，因此 PowerShell 语法错误是命令失败，而非启动失败。
+- **后台 spawn 失败提示只投递一次**——subprocess 服务不会为从未运行的进程缓冲输出，因此执行器只把 `spawn failed: …` 注入一次 `readOutput()` 增量；丢弃该增量的读取方无法恢复它。
+- **Windows 终止不报告信号**——被强制终止的进程以退出码 1、`signal: null` 结束，因此基于信号的状态分类（POSIX `killed`）在 Windows 上不适用；`kill()` 发起的停止仍会直接盖上 `killed`。
+- **编码 preamble 位于命令之前**——PowerShell 要求 `param(...)`、`#requires` 与 `using namespace`/`using assembly` 语句位于脚本最顶部，因此以其中一种开头的命令无法在 UTF-8 输出 preamble 下运行。`param(...)` 脚本可包进 `& { … }`（param 块可以合法地位于脚本块开头）；`using` 语句与 `#requires` 在命令内没有变通办法（`#requires` 在 `-Command` 中无论位置如何都不生效）——此类脚本请改从文件运行。
+- **Windows PowerShell 5.1 下的非 ASCII stdin 可能被错误解码**——preamble 只固定输出编码；`[Console]::InputEncoding` 保持主机默认，因为在重定向 stdin 下设置它会抛出异常。pwsh 7 默认 UTF-8，不受影响。
+
+清理启发式与 spill 保留的注意事项由 [`dsh-subprocess-local`](../../subprocess/subprocess-local/README.md) 持有，它拥有这些机制。

packages/bash/pwsh-local/package.json

@@ -0,0 +1,47 @@
+{
+  "name": "@deepseek-ai/dsh-pwsh-local",
+  "description": "Local PowerShell implementation of the DeepSeek Harness bash executor seam",
+  "version": "0.0.1",
+  "private": true,
+  "type": "module",
+  "main": "lib/index.js",
+  "types": "lib/types/index.d.ts",
+  "exports": {
+    ".": {
+      "types": "./lib/types/index.d.ts",
+      "default": "./lib/index.js"
+    },
+    "./invariant": {
+      "types": "./lib/types/invariant.d.ts",
+      "default": "./lib/invariant.js"
+    },
+    "./src/*": "./src/*",
+    "./package.json": "./package.json"
+  },
+  "files": [
+    "lib/index.js",
+    "lib/invariant.js",
+    "lib/types/**/*.d.ts",
+    "lib/types/**/*.d.ts.map",
+    "src"
+  ],
+  "license": "BSD-3-Clause",
+  "peerDependencies": {
+    "@deepseek-ai/dsh-bash": "^0.0.1",
+    "@deepseek-ai/dsh-invariants": "^0.0.1",
+    "@deepseek-ai/dsh-subprocess": "^0.0.1",
+    "@deepseek-ai/dsh-timeout": "^0.0.1",
+    "cordis": "^4.0.0-rc.7"
+  },
+  "dependencies": {
+    "schemastery": "^3.18.0"
+  },
+  "devDependencies": {
+    "@deepseek-ai/dsh-bash": "workspace:^",
+    "@deepseek-ai/dsh-invariants": "workspace:^",
+    "@deepseek-ai/dsh-subprocess": "workspace:^",
+    "@deepseek-ai/dsh-subprocess-local": "workspace:^",
+    "@deepseek-ai/dsh-timeout": "workspace:^",
+    "cordis": "^4.0.0-rc.7"
+  }
+}

packages/bash/pwsh-local/src/index.ts

@@ -0,0 +1,288 @@
+/**
+ * Local PowerShell implementation of the bash executor seam. Each command runs
+ * as `pwsh -NoLogo -NoProfile -NonInteractive -Command <command>` in a managed
+ * process spawned through `ctx.subprocess`; the executor owns command
+ * defaulting, deadlines and cause classification, the model-friendly terminal
+ * environment, and the model-facing stdout/stderr merge for background reads.
+ *
+ * The command string is passed as ONE argv element to `-Command`: PowerShell
+ * itself parses the text, and no intermediate shell exists, so there is no
+ * shell-quoting layer to escape (the `bash -c` string domain has no
+ * equivalent here). Native Win32 paths (`C:\...`) pass through unchanged.
+ *
+ * @module @deepseek-ai/dsh-pwsh-local
+ */
+
+import { Context } from 'cordis'
+import z from 'schemastery'
+import { BashExecutor } from '@deepseek-ai/dsh-bash'
+import type { BashExecRequest, BashExecSpec, BashProcess, BashProcessRead, BashRunResult, CollectedOutput } from '@deepseek-ai/dsh-bash'
+import type { SubprocessCollect, SubprocessHandle, SubprocessOutputReader, SubprocessSpawnSpec } from '@deepseek-ai/dsh-subprocess'
+import { clampTimeout, deadline, timeoutOf } from '@deepseek-ai/dsh-timeout'
+import { resolvePwshPath } from './resolve.ts'
+
+/* jscpd:ignore-start -- deliberate call-for-call mirror of dsh-bash-local (Agent Note: pwsh-tool-and-executor). */
+/**
+ * Model-friendly environment overrides for PowerShell: disable colors and
+ * pagers that would garble tool output. `TERM=dumb` is a POSIX concept and is
+ * deliberately absent; `NO_COLOR` is honored by modern pwsh renderers.
+ */
+export const ENV_OVERRIDES = {
+  NO_COLOR: '1',
+  PAGER: 'cat',
+  GIT_PAGER: 'cat',
+} as const
+
+/**
+ * UTF-8 output pinning prepended to every command. The subprocess collector
+ * decodes output bytes as UTF-8, but Windows PowerShell 5.1 (the last-resort
+ * executable fallback) writes the console/OEM code page by default, which
+ * garbles non-ASCII output; pwsh 7 defaults to UTF-8 and is unaffected. The
+ * statements ride on line 1 after `; ` separators so PowerShell error line
+ * numbers stay accurate.
+ */
+export const ENCODING_PREAMBLE =
+  '[Console]::OutputEncoding = [System.Text.UTF8Encoding]::new($false); $OutputEncoding = [System.Text.UTF8Encoding]::new($false); '
+
+/** Default SIGTERM→SIGKILL grace period (the `graceMs` config). */
+const DEFAULT_GRACE_MS = 3_000
+
+/** Default per-stream spill cap (the `maxSpillBytes` config). */
+const DEFAULT_MAX_SPILL_BYTES = 64 * 1024 * 1024
+
+/** Plugin config (all optional — `static Config` supplies the defaults). */
+export interface Config {
+  /** Default working directory for commands (default: process.cwd()). */
+  cwd?: string
+  /** Default foreground timeout in milliseconds. */
+  timeoutMs?: number
+  /** Upper bound for per-call timeout overrides. */
+  maxTimeoutMs?: number
+  /** Per-stream in-memory output cap; overflow spills to a temp file. */
+  maxOutputBytes?: number
+  /** Per-stream spill-file cap; larger streams retain only their in-memory tail. */
+  maxSpillBytes?: number
+  /** Grace period for kill escalation and for inherited pipes after shell exit. */
+  graceMs?: number
+  /**
+   * Explicit pwsh executable. When omitted, well-known Windows install
+   * locations and PATH entries are probed in order (PowerShell 7 install,
+   * PATH entries such as the Microsoft Store install, then Windows
+   * PowerShell 5.1), falling back to a bare `pwsh` resolved through PATH.
+   */
+  pwshPath?: string
+}
+
+/** The shape after schemastery applied the defaults (cwd/pwshPath have none). */
+type ResolvedConfig = Required<Omit<Config, 'cwd' | 'pwshPath'>> & Pick<Config, 'cwd' | 'pwshPath'>
+
+// Resolution lives in its own dependency-free module so the repository's
+// coverage-gate probe shares the exact definition the suites use.
+export { candidatePwshPaths, resolvePwshPath } from './resolve.ts'
+
+/** Project a settled collect-mode reader into the final CollectedOutput shape. */
+function finalOutput(reader: SubprocessOutputReader): CollectedOutput {
+  const read = reader.readFrom(0)
+  return {
+    text: read.text,
+    truncated: read.lossy,
+    ...read.spillPath !== undefined ? { spillPath: read.spillPath } : {},
+  }
+}
+
+function assertPositiveFinite(name: string, value: number): void {
+  if (!Number.isFinite(value) || value <= 0) {
+    throw new Error(`pwsh-local: ${name} must be a positive finite number`)
+  }
+}
+
+/**
+ * Local PowerShell executor over `ctx.subprocess`. Bounded output, spill
+ * files, and process-tree termination are the subprocess service's mechanics;
+ * this executor supplies their configured budgets per spawn.
+ */
+export class PwshLocalExecutor extends BashExecutor {
+  static inject = ['subprocess']
+
+  static Config: z<Config> = z.object({
+    cwd: z.string(),
+    timeoutMs: z.number().default(120_000),
+    maxTimeoutMs: z.number().default(600_000),
+    maxOutputBytes: z.number().default(64_000),
+    maxSpillBytes: z.number().default(DEFAULT_MAX_SPILL_BYTES),
+    graceMs: z.number().default(DEFAULT_GRACE_MS),
+    pwshPath: z.string(),
+  })
+
+  /** Validated config (schemastery applied the defaults before construction). */
+  readonly config: ResolvedConfig
+
+  /** The pwsh executable resolved once at construction. */
+  readonly pwshPath: string
+
+  constructor(ctx: Context, config: Config) {
+    super(ctx)
+    // Schemastery fills these fields before construction; the type does not encode that step.
+    this.config = config as ResolvedConfig
+    assertPositiveFinite('timeoutMs', this.config.timeoutMs)
+    assertPositiveFinite('maxTimeoutMs', this.config.maxTimeoutMs)
+    assertPositiveFinite('maxOutputBytes', this.config.maxOutputBytes)
+    assertPositiveFinite('maxSpillBytes', this.config.maxSpillBytes)
+    assertPositiveFinite('graceMs', this.config.graceMs)
+    this.pwshPath = resolvePwshPath(this.config.pwshPath)
+  }
+
+  /**
+   * Resolve a request into a fully-specified spec: fill `workdir` from
+   * `config.cwd` (else `process.cwd()`), and `timeoutMs` from
+   * `config.timeoutMs`, capped at `config.maxTimeoutMs`.
+   */
+  resolve(request: BashExecRequest): BashExecSpec {
+    const timeoutMs = clampTimeout(
+      request.timeoutMs,
+      this.config.timeoutMs,
+      this.config.maxTimeoutMs,
+      'pwsh-local: request.timeoutMs',
+    )
+    const stdoutMaxBytes = request.stdoutMaxBytes ?? this.config.maxOutputBytes
+    assertPositiveFinite('request.stdoutMaxBytes', stdoutMaxBytes)
+    return {
+      command: request.command,
+      workdir: request.workdir ?? this.config.cwd ?? process.cwd(),
+      timeoutMs,
+      stdoutMaxBytes,
+      ...request.signal ? { signal: request.signal } : {},
+      ...request.stdin !== undefined ? { stdin: request.stdin } : {},
+      ...request.env !== undefined ? { env: request.env } : {},
+      ...request.dshEnv !== undefined ? { dshEnv: request.dshEnv } : {},
+      sandboxPolicy: request.sandboxPolicy,
+    }
+  }
+
+  /** Map one resolved bash spec onto a fully-specified subprocess spawn. */
+  private spawnSpec(spec: BashExecSpec, stdoutMaxBytes: number, signal: AbortSignal | undefined): SubprocessSpawnSpec {
+    const collect = (maxBytes: number): SubprocessCollect =>
+      ({ maxBytes, spill: { maxBytes: this.config.maxSpillBytes } })
+    return {
+      argv: [this.pwshPath, '-NoLogo', '-NoProfile', '-NonInteractive', '-Command', `${ENCODING_PREAMBLE}${spec.command}`],
+      cwd: spec.workdir,
+      stdio: {
+        stdin: spec.stdin !== undefined ? { data: spec.stdin } : 'ignore',
+        stdout: collect(stdoutMaxBytes),
+        stderr: collect(this.config.maxOutputBytes),
+      },
+      graceMs: this.config.graceMs,
+      signal,
+      env: { ...ENV_OVERRIDES, ...spec.env, ...spec.dshEnv },
+    }
+  }
+
+  /** The collect-mode readers the executor itself requested (present by construction). */
+  private static collected(handle: SubprocessHandle): { stdout: SubprocessOutputReader; stderr: SubprocessOutputReader } {
+    const { stdout, stderr } = handle.collected
+    /* v8 ignore start -- collect dispositions expose both readers by the seam contract; defensive. */
+    if (stdout === undefined || stderr === undefined) {
+      throw new Error('pwsh-local: subprocess implementation dropped a requested collect stream')
+    }
+    /* v8 ignore stop */
+    return { stdout, stderr }
+  }
+
+  async run(spec: BashExecSpec): Promise<BashRunResult> {
+    // One deadline combines timeout and upstream cancellation; disposal clears its timer.
+    using d = deadline(spec.signal, spec.timeoutMs, 'BASH_TIMEOUT')
+    const handle = this.ctx.subprocess.spawn(this.spawnSpec(spec, spec.stdoutMaxBytes, d.signal))
+    const outcome = await handle.done
+    const collected = PwshLocalExecutor.collected(handle)
+    // Only this executor's timeout reason counts as timedOut; outer deadlines count as aborts.
+    const timedOut = timeoutOf(d.signal, 'BASH_TIMEOUT') !== undefined
+    const aborted = d.signal.aborted && !timedOut
+    return {
+      ...outcome,
+      timedOut,
+      aborted,
+      timeoutMs: spec.timeoutMs,
+      stdout: finalOutput(collected.stdout),
+      stderr: finalOutput(collected.stderr),
+    }
+  }
+
+  start(spec: BashExecSpec): BashProcess {
+    // Background runs ignore timeoutMs; callers stop them through kill() or spec.signal.
+    const running = this.ctx.subprocess.spawn(this.spawnSpec(spec, this.config.maxOutputBytes, spec.signal))
+    const collected = PwshLocalExecutor.collected(running)
+
+    // A spawn failure produces no process output, so the subprocess service has nothing
+    // to buffer; the note is delivered exactly once through the read path.
+    let spawnFailureNote: string | undefined
+    const consumeSpawnFailure = (): string => {
+      const note = spawnFailureNote ?? ''
+      spawnFailureNote = undefined
+      return note
+    }
+
+    let stdoutOffset = 0
+    let stderrOffset = 0
+    const proc: BashProcess = {
+      status: 'running',
+      exitCode: null,
+      signal: null,
+      done: running.done.then((outcome) => {
+        // Any signal termination is killed, including a command signaling itself.
+        if (proc.status === 'running') {
+          proc.status = spec.signal?.aborted === true || outcome.signal !== null ? 'killed' : 'completed'
+        }
+        proc.exitCode = outcome.exitCode
+        proc.signal = outcome.signal
+        this.onProcessDone(proc, collected.stderr.readFrom(0).text)
+      }, (error: unknown) => {
+        // Background spawn failures settle as killed and surface through the read path.
+        proc.status = 'killed'
+        spawnFailureNote = `spawn failed: ${String(error)}`
+        this.onProcessDone(proc, spawnFailureNote)
+      }),
+      readOutput: (): BashProcessRead => {
+        const out = collected.stdout.readFrom(stdoutOffset)
+        const err = collected.stderr.readFrom(stderrOffset)
+        stdoutOffset = out.nextOffset
+        stderrOffset = err.nextOffset
+
+        // A failed spawn never produced process output, so the note and real
+        // stderr text are mutually exclusive.
+        const errText = err.text.length > 0 ? err.text : consumeSpawnFailure()
+        // Single newline between sections: stdout chunks usually end with one
+        // already; add it only when missing.
+        const separator = out.text.length > 0 && !out.text.endsWith('\n') ? '\n' : ''
+        const delta = out.text
+          + (errText.length > 0 ? `${separator}[stderr]\n${errText}` : '')
+        return {
+          delta,
+          lossy: out.lossy || err.lossy,
+          ...out.spillPath !== undefined ? { stdoutSpillPath: out.spillPath } : {},
+          ...err.spillPath !== undefined ? { stderrSpillPath: err.spillPath } : {},
+        }
+      },
+      kill: (): boolean => {
+        if (proc.status !== 'running') return false
+        proc.status = 'killed'
+        running.terminate()
+        return true
+      },
+    }
+    return proc
+  }
+
+  /**
+   * Settlement hook for subclasses that attach execution facts to a process.
+   * The base implementation is intentionally empty. Mirrored from
+   * `dsh-bash-local` (whose sandboxing subclass consumes the same hook); it is
+   * the declared seam for a future pwsh-confining subclass and has no consumer
+   * in this package yet.
+   * @param _proc - the settled process handle.
+   * @param _stderr - the process's retained stderr tail used by subclasses for settlement classification.
+   */
+  protected onProcessDone(_proc: BashProcess, _stderr: string): void {}
+}
+/* jscpd:ignore-end */
+
+export default PwshLocalExecutor

packages/bash/pwsh-local/src/invariant.ts

@@ -0,0 +1,30 @@
+/**
+ * Package-owned invariant companion for `@deepseek-ai/dsh-pwsh-local`.
+ * @module @deepseek-ai/dsh-pwsh-local/invariant
+ */
+
+/* jscpd:ignore-start */
+import type { Context } from 'cordis'
+import type { InvariantInstaller } from '@deepseek-ai/dsh-invariants'
+
+const PACKAGE_NAME = '@deepseek-ai/dsh-pwsh-local'
+
+/** Cordis companion plugin name. */
+export const name = 'pwsh-local-invariant'
+/** Service required before the companion can reserve package ownership. */
+export const inject = ['invariants']
+
+/**
+ * No runtime invariant: this package exposes no independent event sequence or mutable data relation
+ * beyond contracts enforced at its owning seam.
+ */
+const install: InvariantInstaller = () => {}
+
+/**
+ * Register this package's invariant companion.
+ * @param ctx - Cordis context carrying the invariant service.
+ * @returns the installed registration's disposer after setup succeeds.
+ */
+export const apply = (ctx: Context): Promise<() => void> =>
+  Promise.resolve(ctx.invariants.register(PACKAGE_NAME, install))
+/* jscpd:ignore-end */

packages/bash/pwsh-local/src/resolve.ts

@@ -0,0 +1,60 @@
+/**
+ * PowerShell executable resolution, dependency-free so non-package consumers
+ * (the repository's coverage-gate probe in `vitest.config.ts`) can share the
+ * ONE resolution definition with the executor and its suites — a probe that
+ * resolved differently from the code under test could exempt a file whose
+ * suites actually run.
+ *
+ * @module @deepseek-ai/dsh-pwsh-local/resolve
+ */
+
+import { existsSync } from 'node:fs'
+import { join } from 'node:path'
+
+/**
+ * Well-known Windows PowerShell install locations plus PATH entries, newest
+ * first. Explicitly parameterized (env) so resolution is a pure function of
+ * its inputs on every platform.
+ * @param env - the environment to probe; defaults to the process environment.
+ * @returns candidate `pwsh` executable paths in resolution order.
+ */
+export function candidatePwshPaths(env: NodeJS.ProcessEnv = process.env): string[] {
+  const programFiles = env.ProgramFiles ?? 'C:\\Program Files'
+  const systemRoot = env.SystemRoot ?? 'C:\\Windows'
+  const candidates = [
+    join(programFiles, 'PowerShell', '7', 'pwsh.exe'),
+  ]
+  // Microsoft Store installs (and any user-added location) live on PATH;
+  // entries may carry surrounding quotes from `setx`-style definitions.
+  for (const entry of (env.PATH ?? '').split(';')) {
+    const trimmed = entry.trim().replace(/^"|"$/g, '')
+    if (trimmed.length === 0) continue
+    candidates.push(join(trimmed, 'pwsh.exe'))
+  }
+  // Windows PowerShell 5.1 remains the last-resort fallback on legacy hosts.
+  candidates.push(join(systemRoot, 'System32', 'WindowsPowerShell', 'v1.0', 'powershell.exe'))
+  return candidates
+}
+
+/**
+ * Resolve the pwsh executable this executor spawns.
+ * @param configured - an explicit `pwshPath` config value, trusted as-is.
+ * @param env - the environment to probe on Windows; defaults to the process environment.
+ * @param platform - the platform to resolve for; defaults to the process platform.
+ * @returns the first existing well-known location on Windows (PowerShell 7
+ *   install, a PATH entry such as the Microsoft Store install, then Windows
+ *   PowerShell 5.1), else `pwsh` for PATH resolution.
+ */
+export function resolvePwshPath(
+  configured?: string,
+  env: NodeJS.ProcessEnv = process.env,
+  platform: NodeJS.Platform = process.platform,
+): string {
+  if (configured !== undefined && configured.length > 0) return configured
+  if (platform === 'win32') {
+    for (const candidate of candidatePwshPaths(env)) {
+      if (existsSync(candidate)) return candidate
+    }
+  }
+  return 'pwsh'
+}

packages/bash/pwsh-local/tests/executor.spec.ts

@@ -0,0 +1,454 @@
+/**
+ * Real-process tests for `@deepseek-ai/dsh-pwsh-local`: the LOCAL subprocess
+ * service plus a REAL pwsh executable, exercised through the executor seam
+ * (`resolve` → `run`/`start`). These verify the world — actual PowerShell
+ * runs, output capture, truncation and spill, deadlines, kill escalation, and
+ * the background-handle contract. The suite self-skips when no usable `pwsh`
+ * resolves (a CI accommodation for hosts without PowerShell); the pure unit tests
+ * (config validation, executable resolution) run on every platform. PowerShell
+ * writes CRLF on Windows, so exact text assertions normalize line endings.
+ */
+
+import { mkdirSync, mkdtempSync, writeFileSync } from 'node:fs'
+import { tmpdir } from 'node:os'
+import { join } from 'node:path'
+import { spawnSync } from 'node:child_process'
+import { describe, expect, it } from 'vitest'
+import { Context } from 'cordis'
+import { PwshLocalExecutor, ENCODING_PREAMBLE, candidatePwshPaths, resolvePwshPath } from '@deepseek-ai/dsh-pwsh-local'
+import LocalSubprocessService from '@deepseek-ai/dsh-subprocess-local'
+import SubprocessService from '@deepseek-ai/dsh-subprocess'
+import type { SubprocessHandle, SubprocessOutputReader, SubprocessSpawnSpec } from '@deepseek-ai/dsh-subprocess'
+import type { BashProcess } from '@deepseek-ai/dsh-bash'
+
+const spillDir = mkdtempSync(join(tmpdir(), 'dsh-pwsh-exec-spec-'))
+
+// The probe follows the executor's own resolution (Program Files installs on
+// Windows are found even when bare `pwsh` is not on PATH).
+const hasPwsh = spawnSync(resolvePwshPath(), ['-NoLogo', '-NoProfile', '-NonInteractive', '-Command', '$true'], { encoding: 'utf8' }).status === 0
+
+/** Normalize PowerShell's platform line endings (CRLF on Windows, LF elsewhere). */
+const lf = (text: string): string => text.replace(/\r\n/g, '\n')
+
+/** Case-insensitive path equality on Windows (Get-Location may re-case the drive). */
+function samePath(actual: string, expected: string): boolean {
+  const norm = (value: string) => (process.platform === 'win32' ? value.toLowerCase() : value)
+  return norm(actual) === norm(expected)
+}
+
+async function setup(config: ConstructorParameters<typeof PwshLocalExecutor>[1] = {}) {
+  const ctx = new Context()
+  await ctx.plugin(LocalSubprocessService)
+  ;(ctx.subprocess as LocalSubprocessService).internals = { spillDir }
+  // A short kill grace via the REAL config path, so escalation tests stay fast.
+  await ctx.plugin(PwshLocalExecutor, { graceMs: 200, ...config })
+  const bash = ctx.bash as PwshLocalExecutor
+  return { ctx, bash }
+}
+
+/**
+ * Poll a handle's consuming readOutput until the ACCUMULATED delta contains
+ * `expected`; returns the accumulation (reads never re-deliver, so the caller
+ * gets everything produced up to the match).
+ */
+async function readUntil(proc: BashProcess, expected: string, timeoutMs = 5_000): Promise<string> {
+  const deadline = Date.now() + timeoutMs
+  let all = ''
+  while (Date.now() < deadline) {
+    all += proc.readOutput().delta
+    if (lf(all).includes(expected)) return lf(all)
+    await new Promise(resolve => setTimeout(resolve, 20))
+  }
+  throw new Error(`process output did not include ${JSON.stringify(expected)}; accumulated ${JSON.stringify(lf(all))}`)
+}
+
+describe('resolvePwshPath and candidatePwshPaths (pure, every platform)', () => {
+  it('trusts an explicit configured path verbatim', () => {
+    expect(resolvePwshPath('C:\\custom\\pwsh.exe')).toBe('C:\\custom\\pwsh.exe')
+    expect(resolvePwshPath('pwsh')).toBe('pwsh')
+  })
+
+  it('falls through an empty configured path to platform resolution', () => {
+    // SystemRoot points at a non-existent tree so the Windows PowerShell 5.1
+    // fallback candidate cannot exist either.
+    expect(resolvePwshPath('', { PATH: 'P:\\Store', SystemRoot: 'S:\\no-windows' }, 'win32')).toBe('pwsh')
+  })
+
+  it('returns pwsh on non-Windows platforms regardless of the environment', () => {
+    expect(resolvePwshPath(undefined, { ProgramFiles: 'P:\\Program Files' }, 'linux')).toBe('pwsh')
+    expect(resolvePwshPath(undefined, { PATH: 'P:\\Store' }, 'darwin')).toBe('pwsh')
+  })
+
+  it('lists PowerShell 7, PATH entries (quotes stripped), then Windows PowerShell 5.1 on win32', () => {
+    const candidates = candidatePwshPaths({
+      ProgramFiles: 'P:\\Program Files',
+      SystemRoot: 'S:\\Windows',
+      PATH: ';"Q:\\quoted store";' + ';',
+    })
+    expect(candidates).toEqual([
+      join('P:\\Program Files', 'PowerShell', '7', 'pwsh.exe'),
+      join('Q:\\quoted store', 'pwsh.exe'),
+      join('S:\\Windows', 'System32', 'WindowsPowerShell', 'v1.0', 'powershell.exe'),
+    ])
+    // A missing PATH contributes no entries (the empty-string fallback).
+    expect(candidatePwshPaths({ ProgramFiles: 'P:\\Program Files', SystemRoot: 'S:\\Windows' }))
+      .toEqual([
+        join('P:\\Program Files', 'PowerShell', '7', 'pwsh.exe'),
+        join('S:\\Windows', 'System32', 'WindowsPowerShell', 'v1.0', 'powershell.exe'),
+      ])
+  })
+
+  it('returns the first EXISTING win32 candidate, else pwsh', () => {
+    const dir = mkdtempSync(join(tmpdir(), 'dsh-pwsh-resolve-'))
+    const store = join(dir, 'store')
+    mkdirSync(store, { recursive: true })
+    writeFileSync(join(store, 'pwsh.exe'), '')
+    // The existing PATH entry wins over the non-existent Program Files install.
+    expect(resolvePwshPath(undefined, { ProgramFiles: join(dir, 'missing'), PATH: store }, 'win32'))
+      .toBe(join(store, 'pwsh.exe'))
+    // No candidate exists anywhere (SystemRoot points at a non-existent tree,
+    // so even the Windows PowerShell 5.1 fallback cannot exist) → the
+    // PATH-resolution fallback.
+    expect(resolvePwshPath(undefined, { ProgramFiles: join(dir, 'missing'), PATH: join(dir, 'empty'), SystemRoot: join(dir, 'no-windows') }, 'win32'))
+      .toBe('pwsh')
+  })
+})
+
+describe('spawn construction (pure, every platform)', () => {
+  /** A subprocess service that records spawn specs and settles instantly. */
+  class CapturingSubprocessService extends SubprocessService {
+    specs: SubprocessSpawnSpec[] = []
+    private readonly reader: SubprocessOutputReader = {
+      readFrom: () => ({ text: '', lossy: false, nextOffset: 0 }),
+    }
+    override spawn(spec: SubprocessSpawnSpec): SubprocessHandle {
+      this.specs.push(spec)
+      return {
+        pid: -1,
+        stdin: undefined,
+        stdout: undefined,
+        stderr: undefined,
+        collected: { stdout: this.reader, stderr: this.reader },
+        done: Promise.resolve({ exitCode: 0, signal: null }),
+        terminate: () => {},
+        waitForExit: async () => true,
+      }
+    }
+  }
+
+  it('runs every command as ONE argv element under the UTF-8 encoding preamble', async () => {
+    const ctx = new Context()
+    const subprocess = new CapturingSubprocessService(ctx)
+    await ctx.plugin(PwshLocalExecutor)
+    await ctx.bash.run(ctx.bash.resolve({ command: 'Write-Output 你好' }))
+    expect(subprocess.specs).toHaveLength(1)
+    const { argv } = subprocess.specs[0]!
+    expect(argv.slice(0, 5)).toEqual([expect.any(String), '-NoLogo', '-NoProfile', '-NonInteractive', '-Command'])
+    expect(argv[5]).toBe(`${ENCODING_PREAMBLE}Write-Output 你好`)
+    expect(ENCODING_PREAMBLE).toContain('[Console]::OutputEncoding')
+    expect(ENCODING_PREAMBLE).toContain('$OutputEncoding')
+  })
+})
+
+describe.skipIf(!hasPwsh)('PwshLocalExecutor.run', () => {
+  it('resolves with output and the effective timeout', async () => {
+    const { bash } = await setup({ timeoutMs: 5_000 })
+    const result = await bash.run(bash.resolve({ command: 'Write-Output hi' }))
+    expect(result.exitCode).toBe(0)
+    expect(lf(result.stdout.text)).toBe('hi\n')
+    expect(result.timeoutMs).toBe(5_000)
+  })
+
+  it('uses config cwd, overridable per call', async () => {
+    const first = mkdtempSync(join(tmpdir(), 'dsh-pwsh-cwd-a-'))
+    const second = mkdtempSync(join(tmpdir(), 'dsh-pwsh-cwd-b-'))
+    const { bash } = await setup({ cwd: first })
+    const fromConfig = await bash.run(bash.resolve({ command: '(Get-Location).Path' }))
+    expect(samePath(fromConfig.stdout.text.trim(), first)).toBe(true)
+    const fromCall = await bash.run(bash.resolve({ command: '(Get-Location).Path', workdir: second }))
+    expect(samePath(fromCall.stdout.text.trim(), second)).toBe(true)
+  })
+
+  it('defaults cwd to process.cwd()', async () => {
+    const { bash } = await setup()
+    const result = await bash.run(bash.resolve({ command: '(Get-Location).Path' }))
+    expect(samePath(result.stdout.text.trim(), process.cwd())).toBe(true)
+  })
+
+  it('caps per-call timeouts at maxTimeoutMs', async () => {
+    const { bash } = await setup({ timeoutMs: 1_000, maxTimeoutMs: 2_000 })
+    const result = await bash.run(bash.resolve({ command: 'Write-Output ok', timeoutMs: 99_999 }))
+    expect(result.timeoutMs).toBe(2_000)
+  })
+
+  it('rejects invalid numeric config and timeout overrides', async () => {
+    await expect(setup({ timeoutMs: Number.NaN })).rejects.toThrow(/timeoutMs/)
+    await expect(setup({ maxTimeoutMs: 0 })).rejects.toThrow(/maxTimeoutMs/)
+    await expect(setup({ maxOutputBytes: -1 })).rejects.toThrow(/maxOutputBytes/)
+    await expect(setup({ maxSpillBytes: 0 })).rejects.toThrow(/maxSpillBytes/)
+    await expect(setup({ graceMs: 0 })).rejects.toThrow(/graceMs/)
+
+    const { bash } = await setup()
+    expect(() => bash.resolve({ command: 'Write-Output ok', timeoutMs: Number.NaN })).toThrow(/request\.timeoutMs/)
+    expect(() => bash.resolve({ command: 'Write-Output ok', timeoutMs: -1 })).toThrow(/request\.timeoutMs/)
+    expect(() => bash.resolve({ command: 'Write-Output ok', stdoutMaxBytes: Number.NaN })).toThrow(/request\.stdoutMaxBytes/)
+    expect(() => bash.resolve({ command: 'Write-Output ok', stdoutMaxBytes: -1 })).toThrow(/request\.stdoutMaxBytes/)
+  })
+
+  it('defaults stdoutMaxBytes to maxOutputBytes and lets foreground callers raise stdout only', async () => {
+    const { bash } = await setup({ maxOutputBytes: 100 })
+    expect(bash.resolve({ command: 'Write-Output ok' }).stdoutMaxBytes).toBe(100)
+
+    // Raw Console writes avoid PowerShell's own line-ending and formatting
+    // layers, so the byte counts are exact on every platform.
+    const result = await bash.run(bash.resolve({
+      command: '[Console]::Out.Write("x" * 500); [Console]::Error.WriteLine("e" * 500)',
+      stdoutMaxBytes: 500,
+    }))
+
+    expect(result.stdout.text).toBe('x'.repeat(500))
+    expect(result.stdout.truncated).toBe(false)
+    expect(result.stderr.truncated).toBe(true)
+    expect(result.stderr.text.length).toBeLessThanOrEqual(100)
+  })
+
+  it('per-call timeout takes precedence under the cap and kills on expiry', async () => {
+    const { bash } = await setup({ timeoutMs: 60_000 })
+    const result = await bash.run(bash.resolve({ command: 'Start-Sleep -Seconds 60', timeoutMs: 100 }))
+    expect(result.timedOut).toBe(true)
+    // Mutually exclusive: a timeout classifies as timedOut, never also aborted.
+    expect(result.aborted).toBe(false)
+    expect(result.timeoutMs).toBe(100)
+  })
+
+  it('propagates abort signals', async () => {
+    const { bash } = await setup()
+    const controller = new AbortController()
+    const pending = bash.run(bash.resolve({ command: 'Start-Sleep -Seconds 60', signal: controller.signal }))
+    setTimeout(() => { controller.abort() }, 50)
+    const result = await pending
+    expect(result.aborted).toBe(true)
+    // Mutually exclusive: an upstream cancel classifies as aborted, never also timedOut.
+    expect(result.timedOut).toBe(false)
+  })
+
+  it('classifies a self-killed command as neither timed out nor aborted', async () => {
+    const { bash } = await setup({ timeoutMs: 60_000 })
+    const result = await bash.run(bash.resolve({ command: 'Stop-Process -Id $PID' }))
+    expect(result.timedOut).toBe(false)
+    expect(result.aborted).toBe(false)
+    // Windows reports a forced termination without a signal; POSIX reports the
+    // terminating signal PowerShell chose (SIGTERM, or SIGKILL for the hard kill).
+    if (process.platform === 'win32') {
+      expect(result.signal).toBeNull()
+    } else {
+      expect(['SIGTERM', 'SIGKILL']).toContain(result.signal)
+    }
+  })
+
+  it('rejects on spawn failure (bad workdir)', async () => {
+    const { bash } = await setup()
+    await expect(bash.run(bash.resolve({ command: 'Write-Output ok', workdir: '/nonexistent-dsh' }))).rejects.toThrow(/ENOENT/)
+  })
+
+  it('resolve() carries stdin/env/dshEnv onto the spec, and run() threads them to the command', async () => {
+    const { bash } = await setup()
+    const spec = bash.resolve({
+      command: '$s = ([Console]::In.ReadToEnd()).TrimEnd(); Write-Output $s; Write-Output "[$env:SEAM_VAR][$env:DSH_SEAM_VAR]"',
+      stdin: 'piped\n',
+      env: { SEAM_VAR: 'env-ok' },
+      dshEnv: { DSH_SEAM_VAR: 'dsh-ok' },
+    })
+    // resolve() keeps the optional input/environment fields verbatim.
+    expect(spec.stdin).toBe('piped\n')
+    expect(spec.env).toEqual({ SEAM_VAR: 'env-ok' })
+    expect(spec.dshEnv).toEqual({ DSH_SEAM_VAR: 'dsh-ok' })
+    const result = await bash.run(spec)
+    expect(lf(result.stdout.text)).toBe('piped\n[env-ok][dsh-ok]\n')
+  })
+
+  it('resolve() omits stdin/env/dshEnv when the request supplies none', async () => {
+    const { bash } = await setup()
+    const spec = bash.resolve({ command: 'Write-Output ok' })
+    expect('stdin' in spec).toBe(false)
+    expect('env' in spec).toBe(false)
+    expect('dshEnv' in spec).toBe(false)
+  })
+})
+
+describe.skipIf(!hasPwsh)('PwshLocalExecutor.start (background process handles)', () => {
+  it('start returns immediately with a running handle that settles as completed', async () => {
+    const { bash } = await setup()
+    const before = Date.now()
+    const proc = bash.start(bash.resolve({ command: 'Start-Sleep -Milliseconds 200; Write-Output done' }))
+    expect(Date.now() - before).toBeLessThan(150)
+    expect(proc.status).toBe('running')
+    await proc.done
+    expect(proc.status).toBe('completed')
+    expect(proc.exitCode).toBe(0)
+  })
+
+  it('threads stdin and extra env into a background process', async () => {
+    const { bash } = await setup()
+    const proc = bash.start(bash.resolve({
+      command: '$s = ([Console]::In.ReadToEnd()).TrimEnd(); Write-Output $s; Write-Output "[$env:BG_VAR][$env:DSH_BG_VAR]"',
+      stdin: 'bg-stdin\n',
+      env: { BG_VAR: 'bg-env' },
+      dshEnv: { DSH_BG_VAR: 'bg-dsh-env' },
+    }))
+    const output = await readUntil(proc, '[bg-env][bg-dsh-env]')
+    expect(output).toBe('bg-stdin\n[bg-env][bg-dsh-env]\n')
+    await proc.done
+    expect(proc.exitCode).toBe(0)
+  })
+
+  it('readOutput is consuming: increments are never re-delivered, and reads stay valid after exit', async () => {
+    const { bash } = await setup()
+    const proc = bash.start(bash.resolve({ command: 'Write-Output first; Start-Sleep -Seconds 1; Write-Output second' }))
+    const first = await readUntil(proc, 'first\n')
+    expect(lf(first)).toBe('first\n')
+    await proc.done
+    // Read-after-exit returns the remaining buffered output — once.
+    const second = proc.readOutput()
+    expect(lf(second.delta)).toBe('second\n')
+    expect(second.lossy).toBe(false)
+    expect(proc.readOutput().delta).toBe('')
+  })
+
+  it('readOutput marks stderr sections', async () => {
+    const { bash } = await setup()
+    const proc = bash.start(bash.resolve({ command: 'Write-Output out; [Console]::Error.WriteLine("err")' }))
+    await proc.done
+    expect(lf(proc.readOutput().delta)).toBe('out\n[stderr]\nerr\n')
+  })
+
+  it('readOutput reports stderr-only deltas without a leading newline', async () => {
+    const { bash } = await setup()
+    const proc = bash.start(bash.resolve({ command: '[Console]::Error.WriteLine("err")' }))
+    await proc.done
+    expect(lf(proc.readOutput().delta)).toBe('[stderr]\nerr\n')
+  })
+
+  it('readOutput adds a separator only when stdout lacks a trailing newline', async () => {
+    const { bash } = await setup()
+    const proc = bash.start(bash.resolve({ command: '[Console]::Out.Write("out"); [Console]::Error.WriteLine("err")' }))
+    await proc.done
+    expect(lf(proc.readOutput().delta)).toBe('out\n[stderr]\nerr\n')
+  })
+
+  it('readOutput flags lossy reads and reports stdout spill paths', async () => {
+    const { bash } = await setup({ maxOutputBytes: 100 })
+    const proc = bash.start(bash.resolve({ command: '1..100 | ForEach-Object { "line-$_" }' }))
+    await proc.done
+    const read = proc.readOutput()
+    // Window slid past offset 0 → lossy, spill path points at the full stream.
+    expect(read.lossy).toBe(true)
+    expect(read.stdoutSpillPath).toBeDefined()
+  })
+
+  it('readOutput reports stderr spill paths', async () => {
+    const { bash } = await setup({ maxOutputBytes: 100 })
+    const proc = bash.start(bash.resolve({ command: '1..100 | ForEach-Object { [Console]::Error.WriteLine("line-$_") }' }))
+    await proc.done
+    const read = proc.readOutput()
+    expect(read.lossy).toBe(true)
+    expect(read.stderrSpillPath).toBeDefined()
+    expect(lf(read.delta)).toContain('[stderr]')
+  })
+
+  it('kill() terminates the process tree: true once, false after settlement', async () => {
+    const { bash } = await setup()
+    const proc = bash.start(bash.resolve({ command: 'Start-Sleep -Seconds 60' }))
+    expect(proc.kill()).toBe(true)
+    await proc.done
+    expect(proc.status).toBe('killed')
+    expect(proc.kill()).toBe(false)
+  })
+
+  it('kill() returns false for a naturally completed process', async () => {
+    const { bash } = await setup()
+    const proc = bash.start(bash.resolve({ command: 'Write-Output ok' }))
+    await proc.done
+    expect(proc.status).toBe('completed')
+    expect(proc.kill()).toBe(false)
+  })
+
+  it('a spec.signal abort settles the handle as killed, not completed', async () => {
+    const { bash } = await setup()
+    const controller = new AbortController()
+    const proc = bash.start(bash.resolve({ command: 'Start-Sleep -Seconds 60', signal: controller.signal }))
+    controller.abort()
+    await proc.done
+    expect(proc.status).toBe('killed')
+  })
+
+  it.skipIf(process.platform === 'win32')('a self-signal exit settles the handle as killed, not completed (POSIX)', async () => {
+    const { bash } = await setup()
+    const proc = bash.start(bash.resolve({ command: 'Stop-Process -Id $PID' }))
+    await proc.done
+    expect(proc.status).toBe('killed')
+    expect(proc.exitCode).toBeNull()
+    // PowerShell picks SIGTERM for Stop-Process, SIGKILL for the hard kill.
+    expect(['SIGTERM', 'SIGKILL']).toContain(proc.signal)
+  })
+
+  it('a background spawn failure settles as killed with the error readable on stderr', async () => {
+    const { bash } = await setup()
+    const proc = bash.start(bash.resolve({ command: 'Write-Output ok', workdir: '/nonexistent-dsh' }))
+    // done resolves (never rejects) even though the process never ran.
+    await expect(proc.done).resolves.toBeUndefined()
+    expect(proc.status).toBe('killed')
+    expect(proc.readOutput().delta).toContain('spawn failed:')
+  })
+})
+
+describe.skipIf(!hasPwsh)('process lifecycle ownership (the subprocess service, not the executor)', () => {
+  it('a background process survives executor-fiber disposal and dies with the subprocess service', async () => {
+    const ctx = new Context()
+    const managerFiber = await ctx.plugin(LocalSubprocessService)
+    ;(ctx.subprocess as LocalSubprocessService).internals = { spillDir }
+    const executorFiber = await ctx.plugin(PwshLocalExecutor, { graceMs: 200 })
+    const bash = ctx.bash as PwshLocalExecutor
+
+    // The child prints its own pid so the test can probe liveness through the
+    // public read surface alone.
+    const proc = bash.start(bash.resolve({ command: 'Write-Output $PID; Start-Sleep -Seconds 60' }))
+    const pid = Number((await readUntil(proc, '\n')).trim())
+    expect(Number.isInteger(pid) && pid > 0).toBe(true)
+
+    // Executor reload/disposal leaves background work running — the
+    // handle stays live and readable, mirroring the task runtime's
+    // registrations-outlive-producer-fibers contract.
+    await executorFiber.dispose()
+    expect(proc.status).toBe('running')
+    expect(() => process.kill(pid, 0)).not.toThrow()
+
+    // Service disposal kills the group and AWAITS its exit (no orphans).
+    await managerFiber.dispose()
+    expect(() => process.kill(pid, 0)).toThrow()
+    await proc.done
+    // POSIX reports the kill as a signal; Windows reports a forced
+    // termination as exit 1 with no signal (indistinguishable from a crash),
+    // so the status stamp follows the platform's exit facts.
+    expect(proc.status).toBe(process.platform === 'win32' ? 'completed' : 'killed')
+  })
+
+  it('service disposal settles running handles and leaves settled ones untouched', async () => {
+    const ctx = new Context()
+    const managerFiber = await ctx.plugin(LocalSubprocessService)
+    ;(ctx.subprocess as LocalSubprocessService).internals = { spillDir }
+    await ctx.plugin(PwshLocalExecutor, { graceMs: 200 })
+    const bash = ctx.bash as PwshLocalExecutor
+
+    const finished = bash.start(bash.resolve({ command: 'Write-Output done' }))
+    await finished.done
+    expect(finished.status).toBe('completed')
+    const running = bash.start(bash.resolve({ command: 'Start-Sleep -Seconds 60' }))
+
+    await managerFiber.dispose()
+    // A settled process was untouched; the live one was terminated and joined.
+    expect(finished.status).toBe('completed')
+    await running.done
+    expect(running.status).toBe(process.platform === 'win32' ? 'completed' : 'killed')
+  })
+})

packages/bash/pwsh-local/tsconfig.json

@@ -0,0 +1,36 @@
+{
+  "extends": "../../../tsconfig.base.json",
+  "compilerOptions": {
+    "rootDir": "src",
+    "outDir": "lib/types"
+  },
+  "include": [
+    "src"
+  ],
+  "references": [
+    {
+      "path": "../../../vendor/cosmokit"
+    },
+    {
+      "path": "../../../vendor/cordis"
+    },
+    {
+      "path": "../../../vendor/schemastery"
+    },
+    {
+      "path": "../../util/brand"
+    },
+    {
+      "path": "../../util/timeout"
+    },
+    {
+      "path": "../../bash/bash"
+    },
+    {
+      "path": "../../subprocess/subprocess"
+    },
+    {
+      "path": "../../support/invariants"
+    }
+  ]
+}

packages/bash/tool-bash/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/bash/tool-bash/README.md
-README.md: 29b9fba369e1fc6a4b8bb7bdd6543b7678df627d
-README.zh.md: 31f691f7bfb8d2cb905751663151c3f6a6bc6c57
+README.md: 35a5647365dab6daa903c14cba8b83702b50305d
+README.zh.md: eb7901f3445117988d77e6d39b73681480b7a754

packages/bash/tool-bash/README.md

@@ -4,7 +4,7 @@ English | [中文](README.zh.md)
 
 The model-facing `bash` tool registered over the `ctx.bash` executor seam. Foreground execution stays behind that seam; a background process handle is registered with the generic `ctx.tasks` runtime and controlled through `task_output`, `task_list`, and `task_kill` from `@deepseek-ai/dsh-tool-tasks`.
 
-Requires a loaded executor implementation (e.g. `@deepseek-ai/dsh-bash-local`); the plugin stays pending until `ctx.bash` exists (`inject: ['tools', 'bash', 'systemPrompt']`).
+Requires a loaded executor implementation (e.g. `@deepseek-ai/dsh-bash-local`) and the [`@deepseek-ai/dsh-bash-env`](../bash-env/README.md) registry; the plugin stays pending until every injected service exists (`inject: ['tools', 'bash', 'systemPrompt', 'bashEnv']`). The tool contract is bash-dialect — mount a bash-parsing executor.
 
 The package root exposes only the Cordis plugin contract (`name`, `inject`, `Config`, `apply`); result rendering and background-process adaptation remain implementation details covered by same-package tests.
 
@@ -28,26 +28,7 @@ The plugin also contributes the `tool:bash` prompt section (order 105): check th
 
 ### Managed shell environment
 
-Every foreground and background model bash call receives a newly collected trusted `DSH_*` environment. `DSH_HOME` is the absolute Harness home resolved by [`@deepseek-ai/dsh-paths`](../../util/paths/README.md) (`dshHome` config, then ambient `$DSH_HOME`, then `~/.dsh`) and `DSH_SHELL=1` identifies the managed child. Agent calls additionally receive `DSH_SESSION_ID=agent.session.header.id`; when the active persistence seam locates a JSONL artifact they also receive `DSH_SESSION_JSONL=<absolute target path>`. The JSONL path is a location hint: it may not exist before the first flush or contain the current buffered turn, and it is not an authorization credential.
-
-`ctx.bashEnv` owns collection. Other plugins can register an effect-scoped contributor with a stable name, declared keys/descriptions, and `resolve(execution: ToolExecution)`; duplicate ownership and undeclared runtime keys fail loudly, while `list()` enumerates declarations without executing providers. Harness built-ins reserve `DSH_HOME`, `DSH_SHELL`, and `DSH_SESSION_ID`; tool-bash's persistence translator owns `DSH_SESSION_JSONL` by reading the backend-neutral `sessionPersistence.locate()` seam.
-
-```ts
-import type { Context } from 'cordis'
-import type {} from '@deepseek-ai/dsh-tool-bash'
-
-export const inject = ['bashEnv']
-
-export function apply(ctx: Context): void {
-  ctx.bashEnv.register({
-    name: 'deployment-region',
-    variables: { DSH_DEPLOYMENT_REGION: { description: 'Current deployment region.' } },
-    resolve: execution => execution.agent === undefined ? {} : { DSH_DEPLOYMENT_REGION: 'cn-north' },
-  })
-}
-```
-
-The overlay is computed from the current `ToolExecution` and passed through the dedicated `BashExecRequest.dshEnv` channel. The local executor removes all inherited `DSH_*` before merging that snapshot, so nested harnesses and concurrent parent/child agents cannot leak stale identities. `process.env` is never modified. The tool description teaches the generic `$DSH_*` convention rather than naming persistence-specific variables or adding a permanent system-prompt section.
+Every foreground and background model bash call receives a freshly collected trusted `DSH_*` environment through the shared [`dsh-bash-env`](../bash-env/README.md) registry: `DSH_HOME` (the absolute Harness home), `DSH_SHELL=1`, the agent's `DSH_SESSION_ID`, and `DSH_SESSION_JSONL` when the active persistence backend locates one. The registry contract — contributor registration, loud duplicate/undeclared-key failure, the built-in reservations, and the contributor example — lives in that package's README. The snapshot passes through the dedicated `BashExecRequest.dshEnv` channel; the local executor removes all inherited `DSH_*` before merging it, so nested harnesses and concurrent parent/child agents cannot leak stale identities, and `process.env` is never modified. The tool description teaches the generic `$DSH_*` convention rather than naming persistence-specific variables or adding a permanent system-prompt section.
 
 Result text contains stdout, an optional `[stderr]` section, then applicable sandbox-denial, timeout, signal, exit-code, and truncation markers. Timeout is reported independently of final exit status; nonzero exit remains a model-interpreted result rather than `isError`. Truncation links a safe complete spill file or reports it unavailable. Only infrastructure failures such as spawn errors and aborts produce `isError`.
 
@@ -141,7 +122,7 @@ Append-only; newly visible content follows the reusable request prefix and does
 
 #### What the model sees
 
-Validation and policy failures are normalized as `Error: <message>`. This package's stable messages are `invalid command: expected a non-empty string`, `invalid description: expected a non-empty string`, `invalid timeoutMs: expected a positive number, got <value>`, `invalid escalation: sandbox_permissions requires a justification`, `invalid escalation: justification is only valid together with sandbox_permissions`, `invalid justification: expected a non-empty sentence`, `background execution is disabled for this bash tool`, `background tasks unavailable: load @deepseek-ai/dsh-tasks and @deepseek-ai/dsh-tool-tasks`, `sandbox_permissions is not available in this composition (no sandboxing executor to escalate)`, `sandbox escalation to "<mode>" is not strictly wider than this call's current "<mode>" mode`, the approval-availability/rejection/cancellation variants, and `command aborted`.
+Validation and policy failures are normalized as `Error: <message>`. This package's stable messages are `invalid command: expected a non-empty string`, `invalid description: expected a non-empty string`, `invalid timeoutMs: expected a positive number, got <value>`, `invalid escalation: sandbox_permissions requires a justification`, `invalid escalation: justification is only valid together with sandbox_permissions`, `invalid justification: expected a non-empty sentence`, `background execution is disabled for this bash tool`, `background tasks unavailable: load @deepseek-ai/dsh-tasks and @deepseek-ai/dsh-tool-tasks`, `sandbox_permissions is not available in this composition (no sandboxing executor to escalate)`, `sandbox escalation to "<mode>" is not strictly wider than this call's current "<mode>" mode`, the approval-availability/rejection/cancellation variants, and `tool call aborted`.
 
 #### Token effect
 

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

@@ -4,7 +4,7 @@
 
 模型侧 `bash` 工具，注册在 `ctx.bash` 执行器 seam 上。前台执行始终位于该 seam 之后；后台进程句柄会注册到通用 `ctx.tasks` 运行时，并通过 `task_output`、`task_list` 和 `task_kill` 控制；这些工具由 `@deepseek-ai/dsh-tool-tasks` 提供。
 
-需要加载执行器实现（例如 `@deepseek-ai/dsh-bash-local`）；在 `ctx.bash` 可用之前，插件会保持等待状态（`inject: ['tools', 'bash', 'systemPrompt']`）。
+需要加载执行器实现（例如 `@deepseek-ai/dsh-bash-local`）与 [`@deepseek-ai/dsh-bash-env`](../bash-env/README.md) 注册表；在每个注入服务就绪之前，插件会保持等待状态（`inject: ['tools', 'bash', 'systemPrompt', 'bashEnv']`）。工具契约是 bash 方言——请挂载能解析 bash 的执行器。
 
 包（package）根只公开 Cordis 插件契约（`name`、`inject`、`Config`、`apply`）；结果渲染和后台进程适配仍是实现细节，由同包测试覆盖。
 
@@ -28,26 +28,7 @@
 
 ### 托管 shell 环境
 
-每次模型发起的前台或后台 bash 调用都会收到新收集的一组可信 `DSH_*` 环境变量。`DSH_HOME` 是由 [`@deepseek-ai/dsh-paths`](../../util/paths/README.md) 解析出的 Harness home 绝对路径（依次采用 `dshHome` 配置、环境中的 `$DSH_HOME`、`~/.dsh`），`DSH_SHELL=1` 则标识受托管的子进程。Agent 调用还会收到 `DSH_SESSION_ID=agent.session.header.id`；当活跃的持久化 seam 找到 JSONL 产物时，也会收到 `DSH_SESSION_JSONL=<absolute target path>`。JSONL 路径只是位置提示：首次 flush 前它可能尚不存在，也可能不包含当前缓冲的轮次，并且它不是授权凭据。
-
-`ctx.bashEnv` 持有收集过程。其他插件可以注册具有 effect 作用域的贡献方，提供稳定名称、已声明的键／说明以及 `resolve(execution: ToolExecution)`；重复持有或运行时返回未声明的键会快速失败，而 `list()` 无需执行提供方即可列举声明。Harness 内置项保留 `DSH_HOME`、`DSH_SHELL` 和 `DSH_SESSION_ID`；tool-bash 的持久化转换器持有 `DSH_SESSION_JSONL`，其值来自后端无关的 `sessionPersistence.locate()` seam。
-
-```ts
-import type { Context } from 'cordis'
-import type {} from '@deepseek-ai/dsh-tool-bash'
-
-export const inject = ['bashEnv']
-
-export function apply(ctx: Context): void {
-  ctx.bashEnv.register({
-    name: 'deployment-region',
-    variables: { DSH_DEPLOYMENT_REGION: { description: 'Current deployment region.' } },
-    resolve: execution => execution.agent === undefined ? {} : { DSH_DEPLOYMENT_REGION: 'cn-north' },
-  })
-}
-```
-
-overlay 根据当前 `ToolExecution` 计算，并通过专用的 `BashExecRequest.dshEnv` 通道传递。本地执行器会先删除继承的所有 `DSH_*`，再合并该快照，因此嵌套 harness 和并发的父／子 agent 不会泄漏陈旧身份。它绝不会修改 `process.env`。工具说明只教授通用 `$DSH_*` 约定，不会点名持久化专用变量，也不会添加永久的系统提示词段落。
+每次模型发起的前台或后台 bash 调用都会通过共享的 [`dsh-bash-env`](../bash-env/README.md) 注册表收到新收集的一组可信 `DSH_*` 环境变量：`DSH_HOME`（Harness home 绝对路径）、`DSH_SHELL=1`、agent 的 `DSH_SESSION_ID`，以及当活跃持久化后端能定位时的 `DSH_SESSION_JSONL`。注册表契约——贡献方注册、重复／未声明键的响亮失败、内置项保留与贡献方示例——住在该包的 README 里。快照通过专用的 `BashExecRequest.dshEnv` 通道传递；本地执行器会先删除继承的所有 `DSH_*` 再合并，因此嵌套 harness 和并发的父／子 agent 不会泄漏陈旧身份，且绝不修改 `process.env`。工具说明只教授通用 `$DSH_*` 约定，不会点名持久化专用变量，也不会添加永久的系统提示词段落。
 
 结果文本依次包含 stdout、可选的 `[stderr]` 段落和适用的沙箱拒绝、超时、信号、退出代码及截断标记。超时与最终退出状态分别报告；非零退出仍是由模型解释的结果，不会成为 `isError`。截断结果会链接安全的完整 spill 文件，或报告文件不可用。只有 spawn 错误和中止等基础设施故障才会产生 `isError`。
 
@@ -141,7 +122,7 @@ renderer 先输出依数据而定的 stdout 尾部，再输出可选的 `[stderr
 
 #### 模型看到的内容
 
-验证和策略失败统一为 `Error: <message>`。此包的稳定消息包括 `invalid command: expected a non-empty string`、`invalid description: expected a non-empty string`、`invalid timeoutMs: expected a positive number, got <value>`、`invalid escalation: sandbox_permissions requires a justification`、`invalid escalation: justification is only valid together with sandbox_permissions`、`invalid justification: expected a non-empty sentence`、`background execution is disabled for this bash tool`、`background tasks unavailable: load @deepseek-ai/dsh-tasks and @deepseek-ai/dsh-tool-tasks`、`sandbox_permissions is not available in this composition (no sandboxing executor to escalate)`、`sandbox escalation to "<mode>" is not strictly wider than this call's current "<mode>" mode`、审批不可用／拒绝／取消变体，以及 `command aborted`。
+验证和策略失败统一为 `Error: <message>`。此包的稳定消息包括 `invalid command: expected a non-empty string`、`invalid description: expected a non-empty string`、`invalid timeoutMs: expected a positive number, got <value>`、`invalid escalation: sandbox_permissions requires a justification`、`invalid escalation: justification is only valid together with sandbox_permissions`、`invalid justification: expected a non-empty sentence`、`background execution is disabled for this bash tool`、`background tasks unavailable: load @deepseek-ai/dsh-tasks and @deepseek-ai/dsh-tool-tasks`、`sandbox_permissions is not available in this composition (no sandboxing executor to escalate)`、`sandbox escalation to "<mode>" is not strictly wider than this call's current "<mode>" mode`、审批不可用／拒绝／取消变体，以及 `tool call aborted`。
 
 #### Token 影响
 

packages/bash/tool-bash/package.json

@@ -29,12 +29,11 @@
   "peerDependencies": {
     "@deepseek-ai/dsh-agent": "^0.0.1",
     "@deepseek-ai/dsh-bash": "^0.0.1",
+    "@deepseek-ai/dsh-bash-env": "^0.0.1",
     "@deepseek-ai/dsh-invariants": "^0.0.1",
     "@deepseek-ai/dsh-llm": "^0.0.1",
-    "@deepseek-ai/dsh-paths": "^0.0.1",
     "@deepseek-ai/dsh-sandbox": "^0.0.1",
     "@deepseek-ai/dsh-sandbox-policy": "^0.0.1",
-    "@deepseek-ai/dsh-session-persistence": "^0.0.1",
     "@deepseek-ai/dsh-system-prompt": "^0.0.1",
     "@deepseek-ai/dsh-tasks": "^0.0.1",
     "@deepseek-ai/dsh-tools": "^0.0.1",
@@ -49,15 +48,14 @@
     "@deepseek-ai/dsh-agent-loop": "workspace:^",
     "@deepseek-ai/dsh-agent-loop-testkit": "workspace:^",
     "@deepseek-ai/dsh-bash": "workspace:^",
+    "@deepseek-ai/dsh-bash-env": "workspace:^",
     "@deepseek-ai/dsh-bash-local": "workspace:^",
     "@deepseek-ai/dsh-invariants": "workspace:^",
     "@deepseek-ai/dsh-llm": "workspace:^",
     "@deepseek-ai/dsh-subprocess-local": "workspace:^",
-    "@deepseek-ai/dsh-paths": "workspace:^",
     "@deepseek-ai/dsh-sandbox": "workspace:^",
     "@deepseek-ai/dsh-sandbox-policy": "workspace:^",
     "@deepseek-ai/dsh-session": "workspace:^",
-    "@deepseek-ai/dsh-session-persistence": "workspace:^",
     "@deepseek-ai/dsh-session-persistence-jsonl": "workspace:^",
     "@deepseek-ai/dsh-system-prompt": "workspace:^",
     "@deepseek-ai/dsh-tasks": "workspace:^",

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

@@ -8,205 +8,39 @@
  * @module @deepseek-ai/dsh-tool-bash
  */
 
-import { Service, type Context } from 'cordis'
+import type { Context } from 'cordis'
 import z from 'schemastery'
 import { isAbsolute, resolve as resolvePath } from 'node:path'
 import { defineTool, TOOL_ABORTED } from '@deepseek-ai/dsh-tools'
 import type { GenericCallView, TerminalCallView, ToolExecution, ToolResult, ToolResultView } from '@deepseek-ai/dsh-tools'
 import { HarnessError } from '@deepseek-ai/dsh-llm'
 import type { Agent } from '@deepseek-ai/dsh-agent'
-import type {} from '@deepseek-ai/dsh-session-persistence'
 import type {} from '@deepseek-ai/dsh-system-prompt'
 import type {} from '@deepseek-ai/dsh-tasks'
 import type {} from '@deepseek-ai/dsh-user-approval'
+import type {} from '@deepseek-ai/dsh-bash-env'
 import type { SandboxExecutionPolicy, SandboxMode } from '@deepseek-ai/dsh-sandbox'
 import { ESCALATION_TARGETS, approveEscalation, canonicalPath, validateEscalationArgs } from '@deepseek-ai/dsh-sandbox'
 import type { SandboxPolicyService } from '@deepseek-ai/dsh-sandbox-policy'
 import { DSH_ENV_PREFIX } from '@deepseek-ai/dsh-bash'
-import type { BashRunResult, DshEnvironment, DshEnvironmentKey } from '@deepseek-ai/dsh-bash'
-import { DSH_HOME_ENV, resolveDshHome } from '@deepseek-ai/dsh-paths'
+import type { BashRunResult } from '@deepseek-ai/dsh-bash'
 import { processOutcome } from './background.ts'
 import { parseExitStatus, renderProcessRead, renderResult } from './render.ts'
 
-declare module 'cordis' {
-  interface Context {
-    bashEnv: BashEnvRegistry
-  }
-}
-
 export const name = 'tool-bash'
-export const inject = ['tools', 'bash', 'systemPrompt']
+export const inject = ['tools', 'bash', 'systemPrompt', 'bashEnv']
 
-/** Configuration for the bash tool and its managed child environment. */
+/** Configuration for the bash tool. */
 export interface Config {
   /** Expose `run_in_background` (default true); disabled calls are also rejected. */
   enableRunInBackground?: boolean
-  /** DeepSeek Harness home directory exposed as `DSH_HOME`; defaults to `$DSH_HOME` or `~/.dsh`. */
-  dshHome?: string
 }
 
 /** Runtime configuration schema for the bash tool plugin. */
 export const Config: z<Config> = z.object({
   enableRunInBackground: z.boolean().default(true),
-  dshHome: z.string(),
 })
 
-/** Model-visible metadata for one managed `DSH_*` environment variable. */
-export interface BashEnvVariable {
-  /** Concise description of the environment fact represented by the variable. */
-  description: string
-}
-
-/**
- * A plugin contribution to the managed environment of each model bash call.
- * Declared keys make ownership conflicts detectable before the first command;
- * `resolve` computes only the values available for the current execution.
- */
-export interface BashEnvContributor {
-  /** Stable contributor name used in diagnostics and duplicate detection. */
-  name: string
-  /** Complete set of `DSH_*` keys this contributor may return. */
-  variables: Readonly<Record<DshEnvironmentKey, BashEnvVariable>>
-  /**
-   * Resolve this contributor's available values for one tool execution.
-   * @param execution - the bash tool execution and its optional calling agent.
-   * @returns a partial map containing only keys declared in {@link variables}.
-   */
-  resolve(execution: ToolExecution): Readonly<Partial<Record<DshEnvironmentKey, string>>>
-}
-
-/** An enumerable declaration returned by {@link BashEnvRegistry.list}. */
-export interface BashEnvVariableInfo extends BashEnvVariable {
-  /** Contributor that owns the variable. */
-  contributor: string
-  /** Declared `DSH_*` environment variable name. */
-  key: DshEnvironmentKey
-}
-
-const DSH_SHELL_KEY = `${DSH_ENV_PREFIX}SHELL` as const
-const DSH_SESSION_ID_KEY = `${DSH_ENV_PREFIX}SESSION_ID` as const
-const DSH_SESSION_JSONL_KEY = `${DSH_ENV_PREFIX}SESSION_JSONL` as const
-const RESERVED_BASH_ENV_KEYS = new Set<DshEnvironmentKey>([
-  DSH_HOME_ENV,
-  DSH_SHELL_KEY,
-  DSH_SESSION_ID_KEY,
-])
-const BASH_ENV_KEY_SUFFIX = /^[A-Z][A-Z0-9_]*$/
-
-/**
- * Registry (`ctx.bashEnv`) for trusted, per-execution `DSH_*` variables.
- * The namespace is rebuilt for every model bash call: ambient `DSH_*` values
- * are discarded by the executor, then the registry's current snapshot is
- * injected. Built-in shell facts remain owned by the registry itself while
- * plugins can register additional, enumerable facts with effect-scoped
- * disposal.
- */
-export class BashEnvRegistry extends Service {
-  private readonly contributors = new Map<string, BashEnvContributor>()
-  private readonly keyOwners = new Map<DshEnvironmentKey, string>()
-  private readonly dshHome: string
-
-  /**
-   * Create and install the `ctx.bashEnv` service.
-   * @param ctx - Cordis context that owns the service and registrations.
-   * @param config - home-directory configuration for the built-in variables.
-   */
-  constructor(ctx: Context, config: Config = {}) {
-    super(ctx, 'bashEnv')
-    this.dshHome = resolveDshHome(config.dshHome)
-  }
-
-  /**
-   * Register one environment contributor. Names and keys are unique; built-in
-   * keys are reserved. Registration is disposed with the calling plugin fiber.
-   * @param contributor - declared key ownership and per-execution resolver.
-   * @returns the disposer that unregisters the contribution.
-   */
-  register(contributor: BashEnvContributor): () => void {
-    const dispose = this.ctx.effect(function* (this: BashEnvRegistry) {
-      if (contributor.name.trim().length === 0) {
-        throw new Error('bash env contributor name must be non-empty')
-      }
-      if (this.contributors.has(contributor.name)) {
-        throw new Error(`bash env contributor "${contributor.name}" is already registered`)
-      }
-
-      const variables = Object.entries(contributor.variables) as [DshEnvironmentKey, BashEnvVariable][]
-      for (const [key, variable] of variables) {
-        if (!key.startsWith(DSH_ENV_PREFIX)
-          || !BASH_ENV_KEY_SUFFIX.test(key.slice(DSH_ENV_PREFIX.length))) {
-          throw new Error(`bash env contributor "${contributor.name}" declared invalid key "${key}"`)
-        }
-        if (RESERVED_BASH_ENV_KEYS.has(key)) {
-          throw new Error(`bash env contributor "${contributor.name}" cannot own reserved key "${key}"`)
-        }
-        if (variable.description.trim().length === 0) {
-          throw new Error(`bash env contributor "${contributor.name}" must describe "${key}"`)
-        }
-        const owner = this.keyOwners.get(key)
-        if (owner !== undefined) {
-          throw new Error(`bash env key "${key}" is already owned by contributor "${owner}"; contributor "${contributor.name}" cannot also own it`)
-        }
-      }
-
-      this.contributors.set(contributor.name, contributor)
-      for (const [key] of variables) this.keyOwners.set(key, contributor.name)
-      yield () => {
-        this.contributors.delete(contributor.name)
-        for (const [key] of variables) this.keyOwners.delete(key)
-      }
-    }.bind(this), 'bashEnv.register()')
-    return () => void dispose()
-  }
-
-  /**
-   * Build the trusted `DSH_*` snapshot for one bash tool execution.
-   * @param execution - the current tool execution.
-   * @returns an immutable environment overlay containing built-ins and current contributions.
-   */
-  collect(execution: ToolExecution): DshEnvironment {
-    const values: Record<DshEnvironmentKey, string> = {
-      [DSH_HOME_ENV]: this.dshHome,
-      [DSH_SHELL_KEY]: '1',
-    }
-    if (execution.agent !== undefined) {
-      values[DSH_SESSION_ID_KEY] = execution.agent.session.header.id
-    }
-
-    for (const contributor of [...this.contributors.values()].sort((left, right) => left.name.localeCompare(right.name))) {
-      const resolved = contributor.resolve(execution)
-      for (const [rawKey, value] of Object.entries(resolved)) {
-        const key = rawKey as DshEnvironmentKey
-        if (!Object.hasOwn(contributor.variables, key)) {
-          throw new Error(`bash env contributor "${contributor.name}" returned undeclared key "${key}"`)
-        }
-        if (typeof value !== 'string') {
-          throw new Error(`bash env contributor "${contributor.name}" returned a non-string value for "${key}"`)
-        }
-        values[key] = value
-      }
-    }
-
-    return Object.freeze(Object.fromEntries(Object.entries(values).sort(([left], [right]) => left.localeCompare(right))))
-  }
-
-  // TODO(bash-env-list-builtins): Include registry-owned built-ins before diagnostics,
-  // prompt, or UI code treats list() as an exhaustive environment catalog.
-  /**
-   * Enumerate plugin-contributed variables without executing their resolvers.
-   * @returns declarations sorted by environment variable name.
-   */
-  list(): BashEnvVariableInfo[] {
-    return [...this.contributors.values()]
-      .flatMap(contributor => Object.entries(contributor.variables).map(([key, variable]) => ({
-        contributor: contributor.name,
-        description: variable.description,
-        key: key as DshEnvironmentKey,
-      })))
-      .sort((left, right) => left.key.localeCompare(right.key))
-  }
-}
-
 /** Parsed tool args; execute validates value constraints absent from ParameterSchemaSpec. */
 interface BashToolArgs {
   command: string
@@ -354,24 +188,6 @@ const BACKGROUND_OUTPUT_PROPERTIES = {
 } as const
 
 export function apply(ctx: Context, config: Config = {}): void {
-  // FIXME(bash-env-ownership): Move ctx.bashEnv to a tool-independent shell
-  // environment plugin; replacing this tool with persistent Bash must not
-  // remove the managed DSH_* contributor seam.
-  const bashEnv = new BashEnvRegistry(ctx, config)
-  bashEnv.register({
-    name: 'session-persistence',
-    variables: {
-      [DSH_SESSION_JSONL_KEY]: {
-        description: 'Absolute target path of the current session JSONL when the active persistence backend provides one.',
-      },
-    },
-    resolve(execution) {
-      const agent = execution.agent
-      if (agent === undefined) return {}
-      const location = ctx.get('sessionPersistence')?.locate(agent.session.header)
-      return location?.kind === 'jsonl' ? { [DSH_SESSION_JSONL_KEY]: location.path } : {}
-    },
-  })
   const backgroundEnabled = config.enableRunInBackground ?? true
   const defaultMode = ctx.bash.sandboxMode
   const escalationModes: readonly SandboxMode[] = defaultMode === undefined ? [] : ESCALATION_TARGETS
@@ -522,7 +338,7 @@ export function apply(ctx: Context, config: Config = {}): void {
         ? standingPolicy
         : { ...(standingPolicy as SandboxExecutionPolicy), mode: approvedMode }
       const workdir = resolveWorkdir(args.workdir, exec, standingPolicy?.workspaceRoot)
-      const dshEnv = bashEnv.collect(exec)
+      const dshEnv = ctx.bashEnv.collect(exec)
       const request = {
         command: args.command,
         ...workdir !== undefined ? { workdir } : {},
@@ -565,7 +381,11 @@ export function apply(ctx: Context, config: Config = {}): void {
         ...request,
         signal: exec.signal,
       }))
-      if (result.aborted) throw new Error('command aborted')
+      if (result.aborted) {
+        const error = new HarnessError('tool call aborted', TOOL_ABORTED)
+        error.name = 'AbortError'
+        throw error
+      }
       return { kind: 'foreground' as const, ...canonicalBashResult(result) }
     },
     presentCall: presentBashCall,

packages/bash/tool-bash/tests/integration.spec.ts

@@ -14,6 +14,7 @@ import * as ToolTasks from '@deepseek-ai/dsh-tool-tasks'
 import { LocalBashExecutor } from '@deepseek-ai/dsh-bash-local'
 import LocalSubprocessService from '@deepseek-ai/dsh-subprocess-local'
 import * as ToolBash from '@deepseek-ai/dsh-tool-bash'
+import * as BashEnvPlugin from '@deepseek-ai/dsh-bash-env'
 import { MockAdapter, textResponse, toolCallResponse } from '../../../core/agent-loop/tests/mock-adapter.ts'
 
 /**
@@ -32,8 +33,9 @@ async function harness(adapter: MockAdapter, sessionRoot?: string, dshHome?: str
   await ctx.plugin(LocalTaskService)
   await ctx.plugin(ToolTasks)
   await ctx.plugin(LocalSubprocessService)
+  await ctx.plugin(BashEnvPlugin, dshHome === undefined ? {} : { dshHome })
   await ctx.plugin(LocalBashExecutor, { timeoutMs: 10_000 })
-  await ctx.plugin(ToolBash, dshHome === undefined ? {} : { dshHome })
+  await ctx.plugin(ToolBash)
   ctx.llm.registerAdapter(['mock'], adapter)
   return ctx
 }

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

@@ -20,6 +20,7 @@ import { LocalBashExecutor } from '@deepseek-ai/dsh-bash-local'
 import LocalSubprocessService from '@deepseek-ai/dsh-subprocess-local'
 import SandboxPolicyService from '@deepseek-ai/dsh-sandbox-policy'
 import * as ToolBash from '@deepseek-ai/dsh-tool-bash'
+import * as BashEnvPlugin from '@deepseek-ai/dsh-bash-env'
 import { processOutcome } from '../src/background.ts'
 import { renderProcessRead, renderResult } from '../src/render.ts'
 
@@ -35,6 +36,7 @@ async function setup() {
   await ctx.plugin(AgentRegistry)
   await ctx.plugin(LocalSubprocessService)
   ;(ctx.subprocess as LocalSubprocessService).internals = { spillDir }
+  await ctx.plugin(BashEnvPlugin)
   await ctx.plugin(LocalBashExecutor, { timeoutMs: 10_000, graceMs: 200 })
   await ctx.plugin(ToolBash)
   return ctx
@@ -50,6 +52,7 @@ async function setupWithTasks() {
   await ctx.plugin(ToolTasks)
   await ctx.plugin(LocalSubprocessService)
   ;(ctx.subprocess as LocalSubprocessService).internals = { spillDir }
+  await ctx.plugin(BashEnvPlugin)
   await ctx.plugin(LocalBashExecutor, { timeoutMs: 10_000, graceMs: 200 })
   await ctx.plugin(ToolBash)
   return ctx
@@ -188,6 +191,7 @@ async function setupSandboxed(withApproval = false) {
   await ctx.plugin(SandboxPolicyService, {})
   await ctx.plugin(RecordingSandboxExecutor)
   if (withApproval) await ctx.plugin(ApprovalService)
+  await ctx.plugin(BashEnvPlugin)
   await ctx.plugin(ToolBash)
   return { ctx, bash: ctx.bash as RecordingSandboxExecutor }
 }
@@ -281,6 +285,7 @@ describe('bash tool', () => {
     await ctx.plugin(LocalSubprocessService)
     ;(ctx.subprocess as LocalSubprocessService).internals = { spillDir }
     await ctx.plugin(LocalBashExecutor, { maxOutputBytes: 100, graceMs: 200 })
+    await ctx.plugin(BashEnvPlugin)
     await ctx.plugin(ToolBash)
     const result = await call(ctx, 'bash', { command: 'for i in $(seq 1 100); do printf "line-%04d\\n" $i; done', description: 'test command' })
     expect(text(result)).toContain('[output truncated; full output: ')
@@ -300,7 +305,7 @@ describe('bash tool', () => {
     expect(text(result)).toMatch(/ENOENT/)
   })
 
-  it('surfaces foreground aborts as isError', async () => {
+  it('surfaces foreground aborts as the structured TOOL_ABORTED error', async () => {
     const ctx = await setup()
     const controller = new AbortController()
     const pending = ctx.tools.execute({
@@ -312,7 +317,10 @@ describe('bash tool', () => {
     setTimeout(() => { controller.abort() }, 50)
     const result = await pending
     expect(result.isError).toBe(true)
-    expect(text(result)).toMatch(/aborted/)
+    expect(result.error).toMatchObject({
+      message: 'tool call aborted',
+      info: { name: 'AbortError', code: TOOL_ABORTED },
+    })
   })
 
   // Type and required-key violations are rejected by the harness
@@ -389,6 +397,7 @@ describe('bash tool', () => {
     await ctx.plugin(ToolRegistry)
     await ctx.plugin(LocalSubprocessService)
     await ctx.plugin(LocalBashExecutor, {})
+    await ctx.plugin(BashEnvPlugin)
     const fiber = await ctx.plugin(ToolBash)
     expect(ctx.tools.schemas()).toHaveLength(1)
     expect((await ctx.systemPrompt.assemble()).sections.map(s => s.name)).toEqual(['harness:identity', 'deployment:persona', 'tool:bash'])
@@ -403,6 +412,7 @@ describe('bash tool', () => {
     await ctx.plugin(SystemPrompt)
     await ctx.plugin(ToolRegistry)
     // inject: ['tools', 'bash'] keeps the plugin pending until bash exists.
+    await ctx.plugin(BashEnvPlugin)
     await ctx.plugin(ToolBash)
     expect(ctx.tools.schemas()).toHaveLength(0)
     await ctx.plugin(LocalSubprocessService)
@@ -493,6 +503,7 @@ describe('background execution through the task runtime', () => {
     await ctx.plugin(LocalTaskService)
     await ctx.plugin(ToolTasks)
     await ctx.plugin(CountingStartExecutor)
+    await ctx.plugin(BashEnvPlugin)
     await ctx.plugin(ToolBash)
 
     const controller = new AbortController()
@@ -520,6 +531,7 @@ describe('background execution through the task runtime', () => {
     await ctx.plugin(AgentRegistry)
     await ctx.plugin(LocalTaskService)
     await ctx.plugin(CountingStartExecutor)
+    await ctx.plugin(BashEnvPlugin)
     await ctx.plugin(ToolBash)
 
     const result = await call(ctx, 'bash', { command: 'sleep 60', description: 'test command', run_in_background: true })
@@ -534,6 +546,7 @@ describe('background execution through the task runtime', () => {
     await ctx.plugin(SystemPrompt)
     await ctx.plugin(ToolRegistry)
     await ctx.plugin(LocalSubprocessService)
+    await ctx.plugin(BashEnvPlugin)
     await ctx.plugin(LocalBashExecutor, {})
     await ctx.plugin(ToolBash, { enableRunInBackground: false })
 
@@ -568,6 +581,7 @@ describe('sandbox escalation through the generic task producer', () => {
     await ctx.plugin(SystemPrompt)
     await ctx.plugin(ToolRegistry)
     await ctx.plugin(RecordingSandboxExecutor)
+    await ctx.plugin(BashEnvPlugin)
     await expect(ctx.plugin(ToolBash)).rejects.toThrow('tool-bash: the mounted bash executor confines but ctx.sandboxPolicy is missing')
   })
 
@@ -1003,9 +1017,9 @@ describe('tool-owned UI presentation (presentCall / presentResult)', () => {
     // not renderResult output, so a generic fenced card, no terminal output/exit.
     const out = ctx.tools.get('bash')!.presentResult!(
       { command: 'x', description: 'x' },
-      { content: [{ type: 'text', text: 'command aborted' }], isError: true },
+      { content: [{ type: 'text', text: 'tool call aborted' }], isError: true },
     )
-    expect(out).toEqual({ card: 'generic', content: [{ type: 'text', text: '```console\ncommand aborted\n```' }] })
+    expect(out).toEqual({ card: 'generic', content: [{ type: 'text', text: '```console\ntool call aborted\n```' }] })
   })
 
   it('bash presentResult: leaves a non-text (unexpected) result untouched → undefined (UI keeps raw content)', async () => {
@@ -1097,8 +1111,9 @@ describe('the model-facing bash tool builds its request from named args only (no
     }
     await ctx.plugin(LocalTaskService)
     await ctx.plugin(ToolTasks)
+    await ctx.plugin(BashEnvPlugin, { dshHome: recordingDshHome })
     await ctx.plugin(RecordingBashExecutor)
-    await ctx.plugin(ToolBash, { dshHome: recordingDshHome })
+    await ctx.plugin(ToolBash)
     return { ctx, bash: ctx.bash as RecordingBashExecutor }
   }
 

packages/bash/tool-bash/tsconfig.json

@@ -26,21 +26,18 @@
     {
       "path": "../../core/agent"
     },
-    {
-      "path": "../../session-persistence/session-persistence"
-    },
     {
       "path": "../../bash/bash"
     },
-    {
-      "path": "../../util/paths"
-    },
     {
       "path": "../../tasks/tasks"
     },
     {
       "path": "../../core/system-prompt"
     },
+    {
+      "path": "../../bash/bash-env"
+    },
     {
       "path": "../../ui/user-approval"
     },

packages/bash/tool-pwsh/README.i18n.yaml

@@ -0,0 +1,6 @@
+# Bilingual-pair consistency record (docs/i18n/README.md): the git blob hash of each
+# side as of the last confirmed-consistent state. Both languages carry equal authority;
+# after editing either side, bring the other along and re-record with:
+#   pnpm run verify-translation-pairing --write packages/bash/tool-pwsh/README.md
+README.md: dfe26a63684d61dcdd6f969c2c2261dac79325c7
+README.zh.md: 2344f8477e5b15f2c4d366dd82b46358eacbc1b7

packages/bash/tool-pwsh/README.md

@@ -0,0 +1,125 @@
+# @deepseek-ai/dsh-tool-pwsh
+
+English | [中文](README.zh.md)
+
+The model-facing `pwsh` tool registered over the `ctx.bash` executor seam. Intended for Windows compositions where a PowerShell executor (e.g. `@deepseek-ai/dsh-pwsh-local`) backs `ctx.bash`; the tool contract is PowerShell-dialect: native `C:\...` paths and `$env:NAME` variables. Behavior mirrors `dsh-tool-bash` call-for-call minus the sandbox surface — foreground and `run_in_background` execution through the generic task runtime, the managed `DSH_*` environment through the shared `bash-env` registry, and the bash marker/truncation rendering story (a clean exit produces no marker).
+
+Requires a loaded executor implementation and the `bash-env` plugin; the tool stays pending until both exist (`inject: ['tools', 'bash', 'systemPrompt', 'bashEnv']`).
+
+The package root exposes only the Cordis plugin contract (`name`, `inject`, `Config`, `apply`); result rendering (`src/render.ts`) and background-task adaptation (`src/background.ts`) mirror the bash tool's structure and stay reachable through the package's `./src/*` export.
+
+The plugin also contributes the `tool:pwsh` prompt section (order 105): non-zero exits are reported as `[exit code: N]` markers, and Windows interruption settles as exit 1 without a signal marker.
+
+## Tools
+
+### `pwsh`
+
+| Arg | Type | Notes |
+|---|---|---|
+| `command` | string (required) | Run via `pwsh -Command`. No state persists between calls — use `workdir`, not `cd`. |
+| `description` | string (required) | One-line, active-voice summary of the command (5-10 words), for UI/log display only — no effect on execution. |
+| `timeoutMs` | number | Timeout override in milliseconds. The executor applies its configured default and cap. |
+| `workdir` | string | Working directory for this call. Defaults to the calling agent's session cwd (`session.header.cwd`) so each session runs in its own workspace; a relative `workdir` is resolved against that same identity. |
+| `run_in_background` | boolean | Return a task id immediately; no timeout applies. |
+
+`command`, `workdir`, and `timeoutMs` are resolved against the executor's config defaults via `ctx.bash.resolve()` before execution. The workdir default is applied in the tool layer from the calling agent's `session.header.cwd` BEFORE `resolve()` — the per-session cwd must come from `exec.agent`, since N sessions share one executor; only when no session cwd is available does the executor fall back to its own config / `process.cwd()`.
+
+### Managed shell environment
+
+Every foreground and background model pwsh call receives a freshly collected trusted `DSH_*` environment through the shared [`dsh-bash-env`](../bash-env/) registry: `DSH_HOME` (the absolute Harness home), `DSH_SHELL=1`, the agent's `DSH_SESSION_ID`, and `DSH_SESSION_JSONL` when the active persistence backend locates one. Plugins contributing `DSH_*` facts to `ctx.bashEnv` apply to pwsh calls exactly as they do to bash calls. The snapshot passes through the dedicated `BashExecRequest.dshEnv` channel; `process.env` is never modified. The description teaches the generic `$env:DSH_*` convention rather than naming persistence-specific variables.
+
+Result text contains stdout, an optional `[stderr]` section, then applicable truncation, timeout, signal, and exit markers. A clean exit (0, no signal) produces no marker; an empty body renders as `(no output)`. Truncation links a safe complete spill file or reports it unavailable. Timeout is reported independently of final exit status; nonzero exit remains a model-interpreted result rather than `isError`. Windows reports forced termination as exit 1 without a signal, so `[killed by signal: …]` is POSIX-only there. Only infrastructure failures — spawn errors and aborts (`tool call aborted`) — produce `isError`.
+
+The canonical success is `{ kind: 'foreground', ...BashRunResult }` for a completed foreground process or `{ kind: 'background', taskId }` for a published task. The renderer preserves exactly `started background task <id>` for background acks; programmatic consumers use the typed fields without parsing the rendered text.
+
+When `run_in_background` is true, this plugin preflights `ctx.tasks.start()` before spawning, registers the calling agent as owner, and adapts the returned `BashProcess` handle into generic cancel/done/incremental-output hooks. The task runtime owns ids, cross-session isolation, completion notices, waiting, and disposal cleanup; this plugin only maps pwsh exit facts into task output and outcome detail. `enableRunInBackground: false` removes the parameter and rejects a forced background call at execution time.
+
+## UI presentation
+
+The tool owns its `presentCall`/`presentResult` render intent. A foreground call is a `terminal` card carrying command, description, and optional cwd; a `run_in_background` call is a `generic` card with the raw command, mirroring the bash tool's background presentation. A completed result is a `generic` card with the rendered output in a `console` fence. The bash tool's terminal card with its parsed exit-status pill has no pwsh counterpart yet — a PowerShell-aware presentation is roadmap work. These presenters are pure and replay-safe.
+
+## Model Experience
+
+### System prompt
+
+#### What the model sees
+
+Every request in this plugin's registration scope contains the pwsh guidance below. Scoped tool restrictions can hide the schema without removing this independently registered section.
+
+##### Pwsh guidance
+
+```markdown
+Non-zero exits are reported as `[exit code: N]` markers; investigate failures before moving on. On Windows a killed process settles as `[exit code: 1]` without a signal marker; treat a bare exit 1 after an interruption as a termination, not a command failure.
+```
+
+#### Token effect
+
+Small fixed input cost per request while the plugin is active.
+
+#### KV Cache effect
+
+Prefix-stable while the registration scope and prompt text are unchanged. Plugin activation or disposal may invalidate reuse from this prompt section.
+
+### Tool schemas
+
+#### What the model sees
+
+The model sees the generated [`pwsh` schema](../../../docs/tool-catalog.md#deepseek-aidsh-tool-pwsh). Agent-scoped tool restrictions can remove the definition for that agent.
+
+#### Token effect
+
+Fixed schema cost on every request where the tool is visible.
+
+#### KV Cache effect
+
+Prefix-stable while visibility and the tool definition are unchanged. A restriction or config change may invalidate reuse from the first changed token.
+
+### Foreground result
+
+#### What the model sees
+
+The renderer emits the data-dependent stdout tail, then optional `[stderr]` and the stderr tail. Conditional lines are exactly `[output truncated; full output: <path>]`, `[timed out after <timeoutMs>ms]`, `[killed by signal: <signal>]`, and `[exit code: <exitCode>]` (nonzero exits only); an empty body renders as `(no output)`.
+
+#### Token effect
+
+Zero result tokens before a call. Output is bounded per stream, while each emitted line remains in history until compaction.
+
+#### KV Cache effect
+
+Append-only; newly visible content follows the reusable request prefix and does not invalidate existing KV-cache entries.
+
+### Background result
+
+#### What the model sees
+
+A background start renders exactly `started background task <id>`; subsequent reads and status flow through the generic `task_output`/`task_kill` tools, including the lossy-read spill notice when in-memory truncation dropped unread bytes.
+
+#### Token effect
+
+The ack is a fixed short line; task output is bounded per read.
+
+#### KV Cache effect
+
+Append-only; newly visible content follows the reusable request prefix and does not invalidate existing KV-cache entries.
+
+### Tool errors
+
+#### What the model sees
+
+Validation and infrastructure failures are normalized as `Error: <message>`. This package's stable messages are `invalid command: expected a non-empty string`, `invalid description: expected a non-empty string`, `invalid timeoutMs: expected a positive number, got <value>`, `run_in_background is disabled for this deployment (enableRunInBackground: false)`, `background tasks unavailable: load @deepseek-ai/dsh-tasks and @deepseek-ai/dsh-tool-tasks`, and `tool call aborted`.
+
+#### Token effect
+
+Only the failing call adds these retained tokens; an aborted call adds no command output.
+
+#### KV Cache effect
+
+Append-only; newly visible content follows the reusable request prefix and does not invalidate existing KV-cache entries.
+
+## Known Limitations and Deferred Work
+
+- **No sandbox escalation** — `sandbox_permissions`/`justification` are absent; escalation waits for a Windows-confining executor (the bash tool's sandbox surface is not mirrored).
+- **No persistent shell or PTY** — every call starts a fresh `pwsh -Command`; the PTY backends are Linux/macOS-only today, and a Windows ConPTY persistent shell is roadmap work.
+- **PowerShell-dialect contract** — the model must write PowerShell (native paths, `$env:` variables), not bash; there is no dialect translation.
+- **Generic UI presentation** — results use the generic card; a PowerShell-aware terminal card with exit-status pill is roadmap work.
+- **Session-cwd identity is not canonicalized** — the workdir base is the session header cwd as-is, unlike the bash tool's sandbox-root-canonicalized identity; only the sandbox-less case applies here.

packages/bash/tool-pwsh/README.zh.md

@@ -0,0 +1,125 @@
+# @deepseek-ai/dsh-tool-pwsh
+
+[English](README.md) | 中文
+
+注册在 `ctx.bash` 执行器 seam 之上的模型可见 `pwsh` 工具。面向由 PowerShell 执行器（如 `@deepseek-ai/dsh-pwsh-local`）支撑 `ctx.bash` 的 Windows 组合；工具契约是 PowerShell 方言：原生 `C:\...` 路径与 `$env:NAME` 变量。行为与 `dsh-tool-bash` 逐调用对齐、减去 sandbox 面——通过通用任务运行时执行前台与 `run_in_background`、通过共享 `bash-env` 注册表管理 `DSH_*` 环境、以及 bash 的 marker/截断渲染故事（干净退出不产生 marker）。
+
+需要已加载的执行器实现与 `bash-env` 插件；两者都存在前工具保持 pending（`inject: ['tools', 'bash', 'systemPrompt', 'bashEnv']`）。
+
+包根只导出 Cordis 插件契约（`name`、`inject`、`Config`、`apply`）；结果渲染（`src/render.ts`）与后台任务适配（`src/background.ts`）镜像 bash 工具的结构，并可通过包的 `./src/*` 导出访问。
+
+插件还贡献 `tool:pwsh` prompt section（order 105）：非零退出以 `[exit code: N]` marker 报告，Windows 上的中断以无 signal 的 exit 1 结算。
+
+## 工具
+
+### `pwsh`
+
+| Arg | Type | Notes |
+|---|---|---|
+| `command` | string (required) | 通过 `pwsh -Command` 运行。调用之间不保留状态——用 `workdir`，不要用 `cd`。 |
+| `description` | string (required) | 命令的一行主动语态摘要（5-10 词），仅用于 UI/日志展示——不影响执行。 |
+| `timeoutMs` | number | 超时覆盖值（毫秒）。执行器应用其配置的默认值与上限。 |
+| `workdir` | string | 本次调用的工作目录。默认取调用 agent 的会话 cwd（`session.header.cwd`），使每个会话在自己的工作区运行；相对 `workdir` 基于同一身份解析。 |
+| `run_in_background` | boolean | 立即返回任务 id；不适用超时。 |
+
+`command`、`workdir` 与 `timeoutMs` 在执行前经 `ctx.bash.resolve()` 按执行器配置默认值解析。workdir 默认值在工具层于 `resolve()` 之前从调用 agent 的 `session.header.cwd` 取得——每次会话的 cwd 必须来自 `exec.agent`，因为 N 个会话共享一个执行器；仅当没有会话 cwd 时执行器才回退到自己的配置 / `process.cwd()`。
+
+### Managed shell environment
+
+每次前台与后台模型 pwsh 调用都会通过共享的 [`dsh-bash-env`](../bash-env/) 注册表收到一份新收集的受信任 `DSH_*` 环境：`DSH_HOME`（Harness 主目录绝对路径）、`DSH_SHELL=1`、agent 的 `DSH_SESSION_ID`，以及活跃持久化后端定位到 JSONL 时的 `DSH_SESSION_JSONL`。向 `ctx.bashEnv` 贡献 `DSH_*` 事实的插件对 pwsh 调用与 bash 调用一视同仁。快照通过专用的 `BashExecRequest.dshEnv` 通道传递；`process.env` 永不被修改。描述只教授通用的 `$env:DSH_*` 约定，而不是点名持久化相关的变量。
+
+结果文本包含 stdout、可选的 `[stderr]` 段，然后是适用的截断、超时、signal 与退出 marker。干净退出（0、无 signal）不产生 marker；空体渲染为 `(no output)`。截断会链接一个安全的完整 spill 文件，或报告其不可用。超时独立于最终退出状态报告；非零退出仍是模型解读的结果而非 `isError`。Windows 上强制终止以无 signal 的 exit 1 结算，因此 `[killed by signal: …]` 在那里仅存在于 POSIX。只有基础设施失败——spawn 错误与中止（`tool call aborted`）——产生 `isError`。
+
+规范成功形态是已完成前台进程的 `{ kind: 'foreground', ...BashRunResult }` 或已发布任务的 `{ kind: 'background', taskId }`。渲染器对后台 ack 精确保留 `started background task <id>`；编程消费者使用类型化字段而不解析渲染文本。
+
+当 `run_in_background` 为 true 时，本插件在 spawn 前预检 `ctx.tasks.start()`，把调用 agent 注册为 owner，并将返回的 `BashProcess` 句柄适配为通用的 cancel/done/增量输出钩子。任务运行时拥有 id、跨会话隔离、完成通知、等待与清理；本插件只把 pwsh 退出事实映射进任务输出与结果明细。`enableRunInBackground: false` 会移除参数并在执行时拒绝强制的后台调用。
+
+## UI presentation
+
+工具拥有自己的 `presentCall`/`presentResult` 呈现意图。前台调用是携带命令、描述与可选 cwd 的 `terminal` 卡；`run_in_background` 调用是携带原始命令的 `generic` 卡，镜像 bash 工具的后台呈现。完成的结果是以 `console` 围栏包裹渲染输出的 `generic` 卡。bash 工具那种带解析退出状态 pill 的 terminal 卡在 pwsh 侧暂无对应——PowerShell 感知的呈现属于路线图工作。这些 presenter 是纯函数且可重放。
+
+## Model Experience
+
+### System prompt
+
+#### What the model sees
+
+本插件注册作用域内的每个请求都包含下面的 pwsh 指引。作用域工具限制可以隐藏 schema，但不会移除这个独立注册的段落。
+
+##### Pwsh guidance
+
+```markdown
+Non-zero exits are reported as `[exit code: N]` markers; investigate failures before moving on. On Windows a killed process settles as `[exit code: 1]` without a signal marker; treat a bare exit 1 after an interruption as a termination, not a command failure.
+```
+
+#### Token effect
+
+插件激活期间每次请求的固定小额输入成本。
+
+#### KV Cache effect
+
+注册作用域与 prompt 文本不变时前缀稳定。插件激活或释放可能使该 prompt 段落的复用失效。
+
+### Tool schemas
+
+#### What the model sees
+
+模型看到生成的 [`pwsh` schema](../../../docs/tool-catalog.md#deepseek-aidsh-tool-pwsh)。按 agent 作用域的工具限制可以移除该 agent 的定义。
+
+#### Token effect
+
+工具可见的每个请求上的固定 schema 成本。
+
+#### KV Cache effect
+
+可见性与工具定义不变时前缀稳定。限制或配置变更可能从首个变化 token 起使复用失效。
+
+### Foreground result
+
+#### What the model sees
+
+渲染器输出数据相关的 stdout 尾部，然后是可选的 `[stderr]` 与 stderr 尾部。条件行精确为 `[output truncated; full output: <path>]`、`[timed out after <timeoutMs>ms]`、`[killed by signal: <signal>]` 与 `[exit code: <exitCode>]`（仅非零退出）；空体渲染为 `(no output)`。
+
+#### Token effect
+
+调用前零结果 token。每个流的输出有界，而每条已发出的行保留在历史中直到压缩。
+
+#### KV Cache effect
+
+仅追加；新出现的内容跟随可复用的请求前缀，不会使既有 KV-cache 条目失效。
+
+### Background result
+
+#### What the model sees
+
+后台启动精确渲染为 `started background task <id>`；随后的读取与状态通过通用 `task_output`/`task_kill` 工具流转，包括内存截断丢弃未读字节时的 lossy 读取 spill 通知。
+
+#### Token effect
+
+ack 是固定短行；任务输出按读取有界。
+
+#### KV Cache effect
+
+仅追加；新出现的内容跟随可复用的请求前缀，不会使既有 KV-cache 条目失效。
+
+### Tool errors
+
+#### What the model sees
+
+校验与基础设施失败规范化为 `Error: <message>`。本包的稳定消息包括 `invalid command: expected a non-empty string`、`invalid description: expected a non-empty string`、`invalid timeoutMs: expected a positive number, got <value>`、`run_in_background is disabled for this deployment (enableRunInBackground: false)`、`background tasks unavailable: load @deepseek-ai/dsh-tasks and @deepseek-ai/dsh-tool-tasks` 与 `tool call aborted`。
+
+#### Token effect
+
+只有失败的调用会新增这些保留 token；被中止的调用不产生命令输出。
+
+#### KV Cache effect
+
+仅追加；新出现的内容跟随可复用的请求前缀，不会使既有 KV-cache 条目失效。
+
+## Known Limitations and Deferred Work
+
+- **无 sandbox 升级** — 没有 `sandbox_permissions`/`justification`；升级等待 Windows-confining 执行器（bash 工具的 sandbox 面不被镜像）。
+- **无持久 shell 或 PTY** — 每次调用都启动全新的 `pwsh -Command`；PTY 后端目前仅限 Linux/macOS，Windows ConPTY 持久 shell 属于路线图工作。
+- **PowerShell 方言契约** — 模型必须写 PowerShell（原生路径、`$env:` 变量），而不是 bash；没有方言翻译。
+- **通用 UI 呈现** — 结果使用 generic 卡；带退出状态 pill 的 PowerShell 感知 terminal 卡属于路线图工作。
+- **会话 cwd 身份不做规范化** — workdir 基座直接取会话头 cwd 原值，不同于 bash 工具经 sandbox-root 规范化的身份；此处只涉及无 sandbox 场景。

packages/bash/tool-pwsh/package.json

@@ -0,0 +1,59 @@
+{
+  "name": "@deepseek-ai/dsh-tool-pwsh",
+  "description": "Model-facing pwsh tool over the bash executor seam",
+  "version": "0.0.1",
+  "private": true,
+  "type": "module",
+  "main": "lib/index.js",
+  "types": "lib/types/index.d.ts",
+  "exports": {
+    ".": {
+      "types": "./lib/types/index.d.ts",
+      "default": "./lib/index.js"
+    },
+    "./invariant": {
+      "types": "./lib/types/invariant.d.ts",
+      "default": "./lib/invariant.js"
+    },
+    "./src/*": "./src/*",
+    "./package.json": "./package.json"
+  },
+  "files": [
+    "lib/index.js",
+    "lib/invariant.js",
+    "lib/types/**/*.d.ts",
+    "lib/types/**/*.d.ts.map",
+    "src"
+  ],
+  "license": "BSD-3-Clause",
+  "peerDependencies": {
+    "@deepseek-ai/dsh-agent": "^0.0.1",
+    "@deepseek-ai/dsh-bash": "^0.0.1",
+    "@deepseek-ai/dsh-bash-env": "^0.0.1",
+    "@deepseek-ai/dsh-invariants": "^0.0.1",
+    "@deepseek-ai/dsh-llm": "^0.0.1",
+    "@deepseek-ai/dsh-system-prompt": "^0.0.1",
+    "@deepseek-ai/dsh-tasks": "^0.0.1",
+    "@deepseek-ai/dsh-tools": "^0.0.1",
+    "cordis": "^4.0.0-rc.7"
+  },
+  "dependencies": {
+    "schemastery": "^3.18.0"
+  },
+  "devDependencies": {
+    "@deepseek-ai/dsh-agent": "workspace:^",
+    "@deepseek-ai/dsh-bash": "workspace:^",
+    "@deepseek-ai/dsh-bash-env": "workspace:^",
+    "@deepseek-ai/dsh-invariants": "workspace:^",
+    "@deepseek-ai/dsh-llm": "workspace:^",
+    "@deepseek-ai/dsh-loader-smoke": "workspace:^",
+    "@deepseek-ai/dsh-pwsh-local": "workspace:^",
+    "@deepseek-ai/dsh-subprocess-local": "workspace:^",
+    "@deepseek-ai/dsh-system-prompt": "workspace:^",
+    "@deepseek-ai/dsh-tasks": "workspace:^",
+    "@deepseek-ai/dsh-tasks-local": "workspace:^",
+    "@deepseek-ai/dsh-tool-tasks": "workspace:^",
+    "@deepseek-ai/dsh-tools": "workspace:^",
+    "cordis": "^4.0.0-rc.7"
+  }
+}

packages/bash/tool-pwsh/src/background.ts

@@ -0,0 +1,31 @@
+/**
+ * Generic-task adaptation for background pwsh process handles — the shell-agnostic
+ * twin of `dsh-tool-bash`'s background adaptation.
+ *
+ * @module @deepseek-ai/dsh-tool-pwsh/background
+ */
+
+import type { BashProcess } from '@deepseek-ai/dsh-bash'
+
+/* jscpd:ignore-start -- deliberate twin of dsh-tool-bash/background.ts (Agent Note). */
+
+/**
+ * Map a settled background process onto the generic task-outcome vocabulary:
+ * `killed` stays `killed` (detail: the signal when one is known), everything
+ * else is `completed` with the exit code as detail. A nonzero command exit is
+ * reported, not failed, exactly like the foreground rendering.
+ * @param proc - the settled process handle.
+ * @returns the outcome for the `ctx.tasks` registration.
+ */
+export function processOutcome(proc: BashProcess): { status: 'completed' | 'killed'; detail: string } {
+  // TODO(background-infrastructure-outcome): widen BashProcess with an explicit
+  // infrastructure-failure outcome, then map spawn failures and
+  // sandbox.runnerFailed to task `failed`. The current seam aliases a spawn
+  // failure with a signal-less kill and a runner failure with an ordinary
+  // wrapper exit; real nonzero command exits must remain `completed`.
+  if (proc.status === 'killed') {
+    return { status: 'killed', detail: proc.signal !== null ? `signal: ${proc.signal}` : 'killed before exit' }
+  }
+  return { status: 'completed', detail: `exit code: ${proc.exitCode ?? 0}` }
+}
+/* jscpd:ignore-end */

packages/bash/tool-pwsh/src/index.ts

@@ -0,0 +1,306 @@
+/**
+ * Model-facing `pwsh` tool over the `ctx.bash` executor seam. Intended for
+ * Windows compositions where a PowerShell executor (e.g.
+ * `@deepseek-ai/dsh-pwsh-local`) backs `ctx.bash`; the tool contract is
+ * PowerShell-dialect: native `C:\...` paths and `$env:NAME` variables.
+ *
+ * Behavior mirrors `dsh-tool-bash` call-for-call minus the sandbox surface:
+ * foreground and `run_in_background` execution (background handles register
+ * with the generic `ctx.tasks` runtime), the managed `DSH_*` environment
+ * through the shared `bash-env` registry, and the bash marker/truncation
+ * rendering story. UI presentation stays on the existing generic/terminal
+ * cards; a pwsh-specific rendering twin is roadmap work.
+ *
+ * @module @deepseek-ai/dsh-tool-pwsh
+ */
+
+import { isAbsolute, resolve as resolvePath } from 'node:path'
+import type { Context } from 'cordis'
+import z from 'schemastery'
+import { defineTool, TOOL_ABORTED } from '@deepseek-ai/dsh-tools'
+import type { GenericCallView, TerminalCallView, ToolResult, ToolResultView } from '@deepseek-ai/dsh-tools'
+import { HarnessError } from '@deepseek-ai/dsh-llm'
+import type { Agent } from '@deepseek-ai/dsh-agent'
+import type {} from '@deepseek-ai/dsh-system-prompt'
+import type {} from '@deepseek-ai/dsh-tasks'
+import type {} from '@deepseek-ai/dsh-bash-env'
+import type { BashRunResult } from '@deepseek-ai/dsh-bash'
+import { processOutcome } from './background.ts'
+import { renderPwshProcessRead, renderPwshResult } from './render.ts'
+
+declare module '@deepseek-ai/dsh-tasks' {
+  interface TaskKindMap {
+    pwsh: 'pwsh'
+  }
+}
+
+export const name = 'tool-pwsh'
+export const inject = ['tools', 'bash', 'systemPrompt', 'bashEnv']
+
+/** Configuration for the pwsh tool. */
+export interface Config {
+  /** Expose `run_in_background` (default true); disabled calls are also rejected. */
+  enableRunInBackground?: boolean
+}
+
+/** Runtime configuration schema for the pwsh tool plugin. */
+export const Config: z<Config> = z.object({
+  enableRunInBackground: z.boolean().default(true),
+})
+
+/** Parsed tool args; execute validates value constraints absent from ParameterSchemaSpec. */
+interface PwshToolArgs {
+  command: string
+  description: string
+  timeoutMs?: number
+  workdir?: string
+  run_in_background?: boolean
+}
+
+/** The canonical foreground result of one pwsh call (the `output.schema` value shape). */
+interface PwshForegroundResult {
+  kind: 'foreground'
+  exitCode: number | null
+  signal: NodeJS.Signals | null
+  timedOut: boolean
+  aborted: boolean
+  timeoutMs: number
+  stdout: { text: string; truncated: boolean; spillPath?: string }
+  stderr: { text: string; truncated: boolean; spillPath?: string }
+}
+
+/* jscpd:ignore-start -- minimal mirror of dsh-tool-bash's validation and execute plumbing (Agent Note). */
+function validatePwshArgs(args: PwshToolArgs): void {
+  if (args.command.trim().length === 0) {
+    throw new Error('invalid command: expected a non-empty string')
+  }
+  if (args.description.trim().length === 0) {
+    throw new Error('invalid description: expected a non-empty string')
+  }
+  if (args.timeoutMs !== undefined && (!Number.isFinite(args.timeoutMs) || args.timeoutMs <= 0)) {
+    throw new Error(`invalid timeoutMs: expected a positive number, got ${JSON.stringify(args.timeoutMs)}`)
+  }
+}
+/* jscpd:ignore-end */
+
+function pwshDescription(backgroundEnabled: boolean): string {
+  const background = backgroundEnabled
+    ? 'Set `run_in_background: true` for long-running commands: the call returns a task id immediately; read its output with `task_output` and stop it with `task_kill`.'
+    : 'Background execution is not available; long-running commands must finish within the timeout.'
+  return 'Execute a PowerShell command (`pwsh -Command`) and return its stdout/stderr. '
+    + 'Each call runs in a fresh pwsh process: no state (cwd, variables, functions) persists between calls — '
+    + 'pass `workdir` instead of using `cd`. Paths use native Windows form (`C:\\...`); read environment '
+    + 'variables with `$env:NAME`. Non-zero exits are reported as `[exit code: N]`. '
+    + 'Current harness environment facts are exposed through managed `$env:DSH_*` variables; inspect them when needed. '
+    + 'Long output is truncated to its tail; the full output is saved to a file whose path is reported when available. '
+    + 'On Windows a force-killed command settles as `[exit code: 1]` without a signal marker — treat it as an interruption, not a command failure. '
+    + background
+}
+
+/**
+ * Resolve an explicit workdir first, making a relative one session-workspace-relative;
+ * otherwise use the session header cwd and leave executor defaulting as the fallback.
+ */
+function resolveWorkdir(modelWorkdir: string | undefined, exec: { agent?: Agent }): string | undefined {
+  const headerCwd = exec.agent?.session.header.cwd
+  if (modelWorkdir === undefined) return headerCwd
+  if (headerCwd !== undefined && !isAbsolute(modelWorkdir)) {
+    return resolvePath(headerCwd, modelWorkdir)
+  }
+  return modelWorkdir
+}
+
+/** Detach the executor DTO from readonly seam interfaces into plain JSON data. */
+function canonicalPwshResult(result: BashRunResult): PwshForegroundResult {
+  const output = (stream: BashRunResult['stdout']) => ({
+    text: stream.text,
+    truncated: stream.truncated,
+    ...stream.spillPath !== undefined ? { spillPath: stream.spillPath } : {},
+  })
+  return {
+    kind: 'foreground',
+    exitCode: result.exitCode,
+    signal: result.signal,
+    timedOut: result.timedOut,
+    aborted: result.aborted,
+    timeoutMs: result.timeoutMs,
+    /* jscpd:ignore-start -- the canonical projection and background-handle shape mirror dsh-tool-bash's by design (Agent Note). */
+    stdout: output(result.stdout),
+    stderr: output(result.stderr),
+  }
+}
+
+/** Canonical background-handle properties shared by the pwsh output union. */
+const BACKGROUND_OUTPUT_PROPERTIES = {
+  kind: { type: 'string', required: true, const: 'background' },
+  taskId: { type: 'string', required: true },
+} as const
+/* jscpd:ignore-end */
+
+export function apply(ctx: Context, config: Config = {}): void {
+  const backgroundEnabled = config.enableRunInBackground ?? true
+
+  ctx.systemPrompt.section({
+    name: 'tool:pwsh',
+    order: 105,
+    text: 'Non-zero exits are reported as `[exit code: N]` markers; investigate failures before moving on. '
+      + 'On Windows a killed process settles as `[exit code: 1]` without a signal marker; treat a bare exit 1 after an interruption as a termination, not a command failure.',
+  })
+
+  ctx.tools.register(defineTool({
+    name: 'pwsh',
+    description: pwshDescription(backgroundEnabled),
+    parameters: {
+      command: { type: 'string', required: true, description: 'The PowerShell command to execute.' },
+      description: {
+        type: 'string',
+        required: true,
+        description: 'Clear, concise description of what this command does in active voice, '
+          + '5-10 words (shown in the UI). Examples: "ls" → "List files in current directory"; '
+          + '"git status" → "Show working tree status"; "Get-Process" → "List running processes".',
+      },
+      timeoutMs: { type: 'number', description: 'Timeout in milliseconds. The executor applies its configured default and cap, and kills the command on expiry.' },
+      workdir: { type: 'string', description: 'Working directory for this command. Defaults to the session workspace; a relative path is resolved against it.' },
+      ...backgroundEnabled ? {
+        run_in_background: { type: 'boolean' as const, description: 'Run in the background and return a task id immediately (collect with task_output, stop with task_kill). No timeout applies.' },
+      } : {},
+    },
+    output: {
+      // The foreground result wire shape mirrors dsh-tool-bash's by contract —
+      // consumers of one must accept the other (see the pwsh-tool-and-executor
+      // Agent Note).
+      /* jscpd:ignore-start -- deliberate result-schema symmetry with dsh-tool-bash. */
+      schema: {
+        oneOf: [
+          {
+            type: 'object',
+            additionalProperties: false,
+            properties: BACKGROUND_OUTPUT_PROPERTIES,
+          },
+          {
+            type: 'object',
+            additionalProperties: false,
+            properties: {
+              kind: { type: 'string', required: true, const: 'foreground' },
+              exitCode: { required: true, oneOf: [{ type: 'integer' }, { type: 'null' }] },
+              signal: { required: true, oneOf: [{ type: 'string' }, { type: 'null' }] },
+              timedOut: { type: 'boolean', required: true },
+              aborted: { type: 'boolean', required: true },
+              timeoutMs: { type: 'number', required: true },
+              stdout: {
+                type: 'object',
+                additionalProperties: false,
+                required: true,
+                properties: {
+                  text: { type: 'string', required: true },
+                  truncated: { type: 'boolean', required: true },
+                  spillPath: { type: 'string' },
+                },
+              },
+              stderr: {
+                type: 'object',
+                additionalProperties: false,
+                required: true,
+                properties: {
+                  text: { type: 'string', required: true },
+                  truncated: { type: 'boolean', required: true },
+                  spillPath: { type: 'string' },
+                },
+              },
+            },
+          },
+        ],
+      },
+      /* jscpd:ignore-end */
+      render: (_args, value) => [{
+        type: 'text',
+        text: value.kind === 'background'
+          ? `started background task ${value.taskId}`
+          : renderPwshResult(value),
+      }],
+    },
+    /* jscpd:ignore-start -- the execute path mirrors dsh-tool-bash's by design (see the pwsh-tool-and-executor Agent Note). */
+    async execute(args: PwshToolArgs, exec) {
+      validatePwshArgs(args)
+      const workdir = resolveWorkdir(args.workdir, exec)
+      const request = {
+        command: args.command,
+        ...workdir !== undefined ? { workdir } : {},
+        ...args.timeoutMs !== undefined ? { timeoutMs: args.timeoutMs } : {},
+        dshEnv: ctx.bashEnv.collect(exec),
+      }
+      if (args.run_in_background === true) {
+        // Undeclared keys are allowed, so schema omission also needs enforcement.
+        if (!backgroundEnabled) {
+          throw new Error('run_in_background is disabled for this deployment (enableRunInBackground: false)')
+        }
+        const tasks = ctx.get('tasks')
+        if (tasks === undefined) {
+          throw new Error('background tasks unavailable: load @deepseek-ai/dsh-tasks and @deepseek-ai/dsh-tool-tasks')
+        }
+        // The caller owns cancellation until ctx.tasks commits detached ownership.
+        /* v8 ignore start -- the bash twin's branch is exercised by its sandbox-approval mid-call abort;
+           pwsh has no approval surface, and the tool registry's pre-dispatch abort check intercepts
+           already-aborted signals first, so this mirror-only guard has no reachable trigger. */
+        if (exec.signal.aborted) {
+          const error = new HarnessError('tool call aborted', TOOL_ABORTED)
+          error.name = 'AbortError'
+          throw error
+        }
+        /* v8 ignore end */
+        // Task preflight finishes before the starter can spawn a process.
+        const id = tasks.start({
+          kind: 'pwsh',
+          label: args.command,
+          ...exec.agent ? { owner: exec.agent } : {},
+          run: () => {
+            const proc = ctx.bash.start(ctx.bash.resolve(request))
+            return {
+              cancel: () => void proc.kill(),
+              done: proc.done.then(() => processOutcome(proc)),
+              readOutput: () => renderPwshProcessRead(proc.readOutput()),
+            }
+          },
+        })
+        return { kind: 'background' as const, taskId: id }
+      }
+      const result = await ctx.bash.run(ctx.bash.resolve({
+        ...request,
+        signal: exec.signal,
+      }))
+      if (result.aborted) {
+        const error = new HarnessError('tool call aborted', TOOL_ABORTED)
+        error.name = 'AbortError'
+        throw error
+      }
+      return canonicalPwshResult(result)
+    },
+    /* jscpd:ignore-end */
+    /* jscpd:ignore-start -- the background call card mirrors presentBashCall's by design (Agent Note). */
+    presentCall: (args: PwshToolArgs): TerminalCallView | GenericCallView => {
+      // Background acknowledgements carry no terminal exit status; the generic
+      // card mirrors the bash tool's background presentation.
+      if (args.run_in_background === true) {
+        return {
+          card: 'generic',
+          title: args.command,
+          kind: 'execute',
+          rawInput: args.command,
+          content: [{ type: 'text', text: args.description }],
+        }
+      }
+      return {
+        card: 'terminal',
+        title: args.command,
+        description: args.description,
+        ...args.workdir !== undefined ? { cwd: args.workdir } : {},
+      }
+    },
+    /* jscpd:ignore-end */
+    presentResult: (_args: unknown, result: ToolResult): ToolResultView | undefined => {
+      const block = result.content.length === 1 ? result.content[0] : undefined
+      if (block === undefined || block.type !== 'text') return undefined
+      return { card: 'generic', content: [{ type: 'text', text: `\`\`\`console\n${block.text.replace(/\n+$/, '')}\n\`\`\`` }] }
+    },
+  }))
+}

packages/bash/tool-pwsh/src/invariant.ts

@@ -0,0 +1,30 @@
+/**
+ * Package-owned invariant companion for `@deepseek-ai/dsh-tool-pwsh`.
+ * @module @deepseek-ai/dsh-tool-pwsh/invariant
+ */
+
+/* jscpd:ignore-start */
+import type { Context } from 'cordis'
+import type { InvariantInstaller } from '@deepseek-ai/dsh-invariants'
+
+const PACKAGE_NAME = '@deepseek-ai/dsh-tool-pwsh'
+
+/** Cordis companion plugin name. */
+export const name = 'tool-pwsh-invariant'
+/** Service required before the companion can reserve package ownership. */
+export const inject = ['invariants']
+
+/**
+ * No runtime invariant: this package exposes no independent event sequence or mutable data relation
+ * beyond contracts enforced at its owning seam.
+ */
+const install: InvariantInstaller = () => {}
+
+/**
+ * Register this package's invariant companion.
+ * @param ctx - Cordis context carrying the invariant service.
+ * @returns the installed registration's disposer after setup succeeds.
+ */
+export const apply = (ctx: Context): Promise<() => void> =>
+  Promise.resolve(ctx.invariants.register(PACKAGE_NAME, install))
+/* jscpd:ignore-end */

packages/bash/tool-pwsh/src/render.ts

@@ -0,0 +1,81 @@
+/**
+ * Model-facing result rendering for the pwsh tool — the PowerShell twin of
+ * `dsh-tool-bash`'s renderer minus the sandbox surface: stdout, a marked
+ * stderr section, truncation notices with spill paths, then exit-status
+ * markers. Non-zero exits are reported, not errored — the model decides how to
+ * react; only infrastructure failures (spawn errors, aborts) surface as
+ * isError results.
+ *
+ * @module @deepseek-ai/dsh-tool-pwsh/render
+ */
+
+import type { BashProcessRead, CollectedOutput } from '@deepseek-ai/dsh-bash'
+
+/* jscpd:ignore-start -- deliberate twin of dsh-tool-bash/render.ts minus the sandbox surface (Agent Note). */
+
+/** Append the truncation notice (with the full-output spill path) to a stream's text. */
+function streamText(output: CollectedOutput): string {
+  if (!output.truncated) return output.text
+  return `${output.text}\n[output truncated; full output: ${output.spillPath ?? '(unavailable)'}]`
+}
+
+/** The renderable foreground result shape (the schema-derived value, no `kind`). */
+export interface RenderablePwshResult {
+  exitCode: number | null
+  signal: string | null
+  timedOut: boolean
+  timeoutMs: number
+  stdout: CollectedOutput
+  stderr: CollectedOutput
+}
+
+/**
+ * Shape one finished run into the text the model sees: stdout, then a marked
+ * stderr section, then exit-status markers, matching the bash tool's story —
+ * a clean exit (0, no signal) produces no marker.
+ * @param result - the completed foreground run from the executor.
+ * @returns the model-facing text: output body (or `(no output)`), then any timeout/signal/exit markers, each on its own line.
+ */
+export function renderPwshResult(result: RenderablePwshResult): string {
+  const out = streamText(result.stdout)
+  const err = streamText(result.stderr)
+
+  let body = out
+  if (err.length > 0) {
+    // Single newline between sections (stdout usually ends with one already).
+    if (body.length > 0 && !body.endsWith('\n')) body += '\n'
+    body += `[stderr]\n${err}`
+  }
+  if (body.length === 0) body = '(no output)'
+
+  const markers: string[] = []
+  // A command may trap the termination and exit 0 after timeout; still report interruption.
+  if (result.timedOut) markers.push(`[timed out after ${result.timeoutMs}ms]`)
+  if (result.signal !== null) {
+    markers.push(`[killed by signal: ${result.signal}]`)
+  } else if (result.exitCode !== 0) {
+    markers.push(`[exit code: ${result.exitCode}]`)
+  }
+  if (markers.length === 0) return body
+
+  if (!body.endsWith('\n')) body += '\n'
+  return body + markers.join('\n')
+}
+
+/**
+ * Shape one background-process read into the `task_output` delta the model
+ * sees: the incremental delta, plus the lossy-read notice (with full-stream
+ * spill paths) when in-memory truncation dropped unread bytes.
+ * @param read - one incremental read from the process handle.
+ * @returns the delta text with any loss notice appended.
+ */
+export function renderPwshProcessRead(read: BashProcessRead): string {
+  const notices: string[] = []
+  if (read.lossy) {
+    const paths = [read.stdoutSpillPath, read.stderrSpillPath].filter((path): path is string => path !== undefined)
+    notices.push(`[some output was dropped from memory; full output: ${paths.length > 0 ? paths.join(', ') : '(unavailable)'}]`)
+  }
+  if (notices.length === 0) return read.delta
+  return `${read.delta}${read.delta.length > 0 && !read.delta.endsWith('\n') ? '\n' : ''}${notices.join('\n')}`
+}
+/* jscpd:ignore-end */

packages/bash/tool-pwsh/tests/integration.spec.ts

@@ -0,0 +1,154 @@
+/**
+ * Integration tests: the REAL `@deepseek-ai/dsh-pwsh-local` executor plus the
+ * `pwsh` tool, exercised through `ctx.tools.execute()` with a real PowerShell
+ * process. These verify the world — actual commands run, stdout/stderr come
+ * back, exit codes render, timeouts abort, background tasks settle through the
+ * generic task runtime, and per-session cwd resolution works. The suite
+ * self-skips when no usable `pwsh` resolves (a CI accommodation for hosts without
+ * PowerShell); the fake-executor suite (tools.spec.ts) carries the coverage
+ * gate.
+ */
+
+import { afterEach, beforeEach, describe, expect, it } from 'vitest'
+import { mkdtemp, rm, writeFile } from 'node:fs/promises'
+import { tmpdir } from 'node:os'
+import { join } from 'node:path'
+import { spawnSync } from 'node:child_process'
+import { Context } from 'cordis'
+import { CallId } from '@deepseek-ai/dsh-llm'
+import SystemPrompt from '@deepseek-ai/dsh-system-prompt'
+import ToolRegistry, { TOOL_ABORTED } from '@deepseek-ai/dsh-tools'
+import LocalTaskService from '@deepseek-ai/dsh-tasks-local'
+import * as ToolTasks from '@deepseek-ai/dsh-tool-tasks'
+import LocalSubprocessService from '@deepseek-ai/dsh-subprocess-local'
+import { PwshLocalExecutor, resolvePwshPath } from '@deepseek-ai/dsh-pwsh-local'
+import * as ToolPwsh from '@deepseek-ai/dsh-tool-pwsh'
+import * as BashEnvPlugin from '@deepseek-ai/dsh-bash-env'
+
+const testToolSignal = new AbortController().signal
+
+// The probe follows the executor's own resolution (Program Files installs on
+// Windows are found even when bare `pwsh` is not on PATH).
+const hasPwsh = spawnSync(resolvePwshPath(), ['-NoLogo', '-NoProfile', '-NonInteractive', '-Command', '$true'], { encoding: 'utf8' }).status === 0
+
+/** Normalize PowerShell's platform line endings (CRLF on Windows, LF elsewhere). */
+const lf = (text: string): string => text.replace(/\r\n/g, '\n')
+
+let dir: string
+let ctx: Context
+
+let callCounter = 0
+function call(name: string, args: unknown, agentObj?: object, signal?: AbortSignal) {
+  return ctx.tools.execute({
+    signal: signal ?? testToolSignal,
+    callId: CallId(`it-${++callCounter}`),
+    name,
+    arguments: args,
+    ...agentObj ? { agent: agentObj as never } : {},
+  })
+}
+
+function text(result: { content: { type: string; text?: string }[] }): string {
+  return result.content.filter(b => b.type === 'text').map(b => b.text).join('')
+}
+
+describe.skipIf(!hasPwsh)('pwsh tool over the real pwsh executor', () => {
+  beforeEach(async () => {
+    dir = await mkdtemp(join(tmpdir(), 'dsh-tool-pwsh-'))
+    await writeFile(join(dir, 'greeting.txt'), 'hello pwsh\n')
+
+    ctx = new Context()
+    await ctx.plugin(SystemPrompt)
+    await ctx.plugin(ToolRegistry)
+    await ctx.plugin(LocalTaskService)
+    await ctx.plugin(ToolTasks)
+    await ctx.plugin(LocalSubprocessService)
+    await ctx.plugin(BashEnvPlugin)
+    await ctx.plugin(PwshLocalExecutor, { timeoutMs: 20_000, graceMs: 200 })
+    await ctx.plugin(ToolPwsh)
+  })
+
+  afterEach(async () => {
+    await rm(dir, { recursive: true, force: true })
+  })
+
+  const agent = () => ({ session: { header: { id: 'session-int', cwd: dir } } })
+
+  it('runs a command and returns stdout with no marker on a clean exit', async () => {
+    const result = await call('pwsh', { command: 'Write-Output hi', description: 'say hi' }, agent())
+    expect(result.isError).toBe(false)
+    if (result.isError) throw new Error('expected pwsh success')
+    expect(result.value).toMatchObject({ kind: 'foreground', exitCode: 0 })
+    expect(lf(text(result))).toBe('hi\n')
+  })
+
+  it('returns stderr in a marked section and a nonzero exit as a marker, not an error', async () => {
+    const result = await call('pwsh', {
+      command: '[Console]::Error.WriteLine("boom"); exit 3',
+      description: 'fail loudly',
+    }, agent())
+    expect(result.isError).toBe(false)
+    expect(lf(text(result))).toBe('[stderr]\nboom\n[exit code: 3]')
+  })
+
+  it('resolves relative paths in the session workspace', async () => {
+    const result = await call('pwsh', {
+      command: 'Get-Content greeting.txt',
+      description: 'read greeting',
+    }, agent())
+    expect(result.isError).toBe(false)
+    expect(lf(text(result))).toBe('hello pwsh\n')
+  })
+
+  it('a per-call timeout kills the run and reports the timed-out marker, not an error', async () => {
+    const result = await call('pwsh', {
+      command: 'Start-Sleep -Seconds 60',
+      description: 'sleep forever',
+      timeoutMs: 100,
+    }, agent())
+    expect(result.isError).toBe(false)
+    if (result.isError) throw new Error('expected a timed-out foreground result')
+    expect(result.value).toMatchObject({ kind: 'foreground', timedOut: true, aborted: false })
+    // Windows reports the forced termination as exit 1 without a signal;
+    // POSIX reports SIGTERM — the timeout marker is the stable fact.
+    expect(lf(text(result))).toContain('[timed out after 100ms]')
+  })
+
+  it('an upstream cancellation aborts the run', async () => {
+    const controller = new AbortController()
+    const pending = call('pwsh', {
+      command: 'Start-Sleep -Seconds 60',
+      description: 'sleep forever',
+    }, agent(), controller.signal)
+    setTimeout(() => { controller.abort() }, 50)
+    const result = await pending
+    expect(result.isError).toBe(true)
+    expect(result.error).toMatchObject({ info: { name: 'AbortError', code: TOOL_ABORTED } })
+  })
+
+  it('a background run settles through the REAL task_output tool', async () => {
+    const started = await call('pwsh', {
+      command: 'Start-Sleep -Milliseconds 300; Write-Output bg-done',
+      description: 'background greeting',
+      run_in_background: true,
+    })
+    expect(started.isError).toBe(false)
+    if (started.isError) throw new Error('expected background pwsh success')
+    expect(started.value).toMatchObject({ kind: 'background' })
+    const taskId = (started.value as { taskId: string }).taskId
+
+    // The output delta and the terminal status can land in separate reads
+    // (Windows flushes the child pipe at exit), so collect incrementally —
+    // the same two-step shape as the bash background suite.
+    const deadline = Date.now() + 10_000
+    let output = ''
+    while (Date.now() < deadline) {
+      const read = await call('task_output', { task_id: taskId })
+      output += text(read)
+      if (output.includes('bg-done') && output.includes('[status: completed, exit code: 0]')) break
+      await new Promise(resolve => setTimeout(resolve, 50))
+    }
+    expect(output).toContain('bg-done')
+    expect(output).toContain('[status: completed, exit code: 0]')
+  })
+})

packages/bash/tool-pwsh/tests/loader.spec.ts

@@ -0,0 +1,63 @@
+/**
+ * REAL-composition tier (packages/AGENTS.md): boot the examples-owned
+ * tool-pwsh Loader fixture as a subprocess through the same app/boot path a
+ * deployment uses, execute real foreground and background pwsh commands
+ * through the tool registry, and assert the assembled model-visible surface:
+ * schema, prompt section, and rendered results. Self-skips when no `pwsh`
+ * executable exists (a CI accommodation for hosts without PowerShell).
+ */
+
+import { readFile } from 'node:fs/promises'
+import { join } from 'node:path'
+import { fileURLToPath } from 'node:url'
+import { spawnSync } from 'node:child_process'
+import { describe, expect, it } from 'vitest'
+import { LOADER_SMOKE_TEST_TIMEOUT_MS, runLoaderSmoke } from '@deepseek-ai/dsh-loader-smoke'
+import { resolvePwshPath } from '@deepseek-ai/dsh-pwsh-local'
+
+// The probe follows the executor's own resolution (Program Files installs on
+// Windows are found even when bare `pwsh` is not on PATH).
+const hasPwsh = spawnSync(resolvePwshPath(), ['-NoLogo', '-NoProfile', '-NonInteractive', '-Command', '$true'], { encoding: 'utf8' }).status === 0
+
+const driver = fileURLToPath(new URL(
+  '../../../../examples/acp-agent/tests/fixtures/bash/tool-pwsh/driver.ts',
+  import.meta.url,
+))
+const configPath = fileURLToPath(new URL(
+  '../../../../examples/acp-agent/tests/fixtures/bash/tool-pwsh/cordis.yml',
+  import.meta.url,
+))
+const repoTsconfig = fileURLToPath(new URL('../../../../tsconfig.json', import.meta.url))
+
+interface PwshLoaderReport {
+  schemaHasRunInBackground: boolean
+  promptHasMarkerSection: boolean
+  foregroundText: string
+  backgroundText: string
+}
+
+describe.skipIf(!hasPwsh)('tool-pwsh through a real Loader composition', () => {
+  it('registers the pwsh surface and renders real foreground and background results', async () => {
+    let report: PwshLoaderReport | undefined
+    const { stderr } = await runLoaderSmoke({
+      label: 'tool-pwsh loader smoke',
+      tempDirPrefix: 'tool-pwsh-loader-',
+      binScript: driver,
+      libBinScript: driver,
+      configPath,
+      tsconfigPath: repoTsconfig,
+      inspect: async (cwd) => {
+        report = JSON.parse(await readFile(join(cwd, 'pwsh-loader-report.json'), 'utf8')) as PwshLoaderReport
+      },
+    })
+    expect(stderr).not.toContain('UNHANDLED')
+    expect(report).toBeDefined()
+    expect(report).toMatchObject({
+      schemaHasRunInBackground: true,
+      promptHasMarkerSection: true,
+    })
+    expect(report?.foregroundText).toBe('loader-ok\n')
+    expect(report?.backgroundText).toContain('loader-bg-ok')
+    expect(report?.backgroundText).toContain('[status: completed, exit code: 0]')
+  }, LOADER_SMOKE_TEST_TIMEOUT_MS)
+})

packages/bash/tool-pwsh/tests/tools.spec.ts

@@ -0,0 +1,637 @@
+/**
+ * Consumer-surface tests for the `pwsh` tool over a FAKE bash executor,
+ * exercised through `ctx.tools.execute()` so nothing bypasses the tool
+ * registry. The fake executor makes every seam outcome scriptable — output
+ * text, truncation, timeout, abort, nonzero exits, background handles — so
+ * these tests verify the schema, argument validation, workdir derivation,
+ * managed `DSH_*` collection, abort translation, canonical result projection,
+ * rendering, background task wiring, and the UI presenters. Real-pwsh behavior
+ * is pinned separately in integration.spec.ts.
+ */
+
+import { describe, expect, it } from 'vitest'
+import { Context } from 'cordis'
+import { mkdtempSync } from 'node:fs'
+import { tmpdir } from 'node:os'
+import { join, resolve as resolvePath } from 'node:path'
+import { CallId } from '@deepseek-ai/dsh-llm'
+import SystemPrompt, { renderPrompt } from '@deepseek-ai/dsh-system-prompt'
+import ToolRegistry, { TOOL_ABORTED, TOOL_ABORTED_BEFORE_DISPATCH } from '@deepseek-ai/dsh-tools'
+import LocalTaskService from '@deepseek-ai/dsh-tasks-local'
+import * as ToolTasks from '@deepseek-ai/dsh-tool-tasks'
+import AgentRegistry from '@deepseek-ai/dsh-agent'
+import type { Agent } from '@deepseek-ai/dsh-agent'
+import { SessionId } from '@deepseek-ai/dsh-session'
+import { BashExecutor } from '@deepseek-ai/dsh-bash'
+import type { BashExecRequest, BashExecSpec, BashProcess, BashRunResult } from '@deepseek-ai/dsh-bash'
+import * as ToolPwsh from '@deepseek-ai/dsh-tool-pwsh'
+import * as BashEnvPlugin from '@deepseek-ai/dsh-bash-env'
+import type { BashProcessRead } from '@deepseek-ai/dsh-bash'
+import { processOutcome } from '../src/background.ts'
+import { renderPwshProcessRead } from '../src/render.ts'
+
+const testToolSignal = new AbortController().signal
+
+/**
+ * A scriptable fake executor: `resolve()` mirrors the real defaulting, `run()`
+ * returns the armed foreground script, `start()` returns the armed background
+ * handle.
+ */
+class FakeBash extends BashExecutor {
+  requests: BashExecRequest[] = []
+  specs: BashExecSpec[] = []
+  startCalls = 0
+  handler: (spec: BashExecSpec) => BashRunResult = () => runResult('')
+  backgroundHandler: (spec: BashExecSpec) => BashProcess = () => fakeProcess('bg-ok\n')
+
+  override resolve(request: BashExecRequest): BashExecSpec {
+    this.requests.push(request)
+    return {
+      command: request.command,
+      workdir: request.workdir ?? process.cwd(),
+      timeoutMs: request.timeoutMs ?? 60_000,
+      stdoutMaxBytes: request.stdoutMaxBytes ?? 64_000,
+      ...request.signal ? { signal: request.signal } : {},
+      ...request.stdin !== undefined ? { stdin: request.stdin } : {},
+      ...request.env !== undefined ? { env: request.env } : {},
+      ...request.dshEnv !== undefined ? { dshEnv: request.dshEnv } : {},
+      sandboxPolicy: request.sandboxPolicy,
+    }
+  }
+
+  override async run(spec: BashExecSpec): Promise<BashRunResult> {
+    this.specs.push(spec)
+    return this.handler(spec)
+  }
+
+  override start(spec: BashExecSpec): BashProcess {
+    this.startCalls++
+    this.specs.push(spec)
+    return this.backgroundHandler(spec)
+  }
+}
+
+/** A successful run result over the given stdout; overrides script the failure shapes. */
+function runResult(stdout: string, overrides?: Partial<BashRunResult>): BashRunResult {
+  return {
+    exitCode: 0,
+    signal: null,
+    timedOut: false,
+    aborted: false,
+    timeoutMs: 60_000,
+    stdout: { text: stdout, truncated: false },
+    stderr: { text: '', truncated: false },
+    ...overrides,
+  }
+}
+
+/** A settled successful background handle; overrides script failure shapes. */
+function fakeProcess(delta = 'bg-ok\n'): BashProcess {
+  let consumed = false
+  return {
+    status: 'completed',
+    exitCode: 0,
+    signal: null,
+    done: Promise.resolve(),
+    readOutput: () => {
+      if (consumed) return { delta: '', lossy: false }
+      consumed = true
+      return { delta, lossy: false }
+    },
+    kill: () => false,
+  }
+}
+
+/** A running background handle whose kill() settles it as killed (like a real task_kill). */
+function killableProcess(): BashProcess {
+  let resolveDone: () => void = () => {}
+  const done = new Promise<void>((resolve) => { resolveDone = resolve })
+  const proc: BashProcess = {
+    status: 'running',
+    exitCode: null,
+    signal: null,
+    done,
+    readOutput: () => ({ delta: '', lossy: false }),
+    kill: () => {
+      if (proc.status !== 'running') return false
+      proc.status = 'killed'
+      proc.signal = 'SIGTERM'
+      resolveDone()
+      return true
+    },
+  }
+  return proc
+}
+
+async function setup(toolConfig: Partial<ToolPwsh.Config> = {}, dshHome?: string) {
+  const ctx = new Context()
+  await ctx.plugin(SystemPrompt)
+  await ctx.plugin(ToolRegistry)
+  await ctx.plugin(AgentRegistry)
+  await ctx.plugin(BashEnvPlugin, dshHome === undefined ? {} : { dshHome })
+  await ctx.plugin(FakeBash)
+  await ctx.plugin(ToolPwsh, toolConfig)
+  const bash = ctx.bash as FakeBash
+  return { ctx, bash }
+}
+
+/** Full harness: the generic task runtime + its control surface, then the pwsh tool. */
+async function setupWithTasks(toolConfig: Partial<ToolPwsh.Config> = {}, dshHome?: string) {
+  const ctx = new Context()
+  await ctx.plugin(SystemPrompt)
+  await ctx.plugin(ToolRegistry)
+  await ctx.plugin(AgentRegistry)
+  await ctx.plugin(LocalTaskService)
+  await ctx.plugin(ToolTasks)
+  await ctx.plugin(BashEnvPlugin, dshHome === undefined ? {} : { dshHome })
+  await ctx.plugin(FakeBash)
+  await ctx.plugin(ToolPwsh, toolConfig)
+  const bash = ctx.bash as FakeBash
+  return { ctx, bash }
+}
+
+/**
+ * Build a fake {@link Agent} with the shared agent/session identity, give it a
+ * dedicated lifecycle fiber for `Agent.ctx`, and register it in `ctx.agents`.
+ */
+function registerFakeAgent(ctx: Context, sessionId: string): Agent {
+  const scopeFiber = ctx.plugin(() => {})
+  const id = SessionId(sessionId)
+  const agent = {
+    id,
+    ctx: scopeFiber.ctx,
+    session: { id, header: { version: 0, id, createdAt: 0 } },
+  } as unknown as Agent
+  ctx.agents.register(agent)
+  return agent
+}
+
+let callCounter = 0
+function call(ctx: Context, name: string, args: unknown, agent?: Agent) {
+  return ctx.tools.execute({
+    signal: testToolSignal,
+    callId: CallId(`call-${++callCounter}`),
+    name,
+    arguments: args,
+    ...agent ? { agent } : {},
+  })
+}
+
+function text(result: { content: { type: string; text?: string }[] }): string {
+  return result.content.filter(b => b.type === 'text').map(b => b.text).join('')
+}
+
+async function callUntilText(
+  ctx: Context,
+  name: string,
+  args: unknown,
+  expected: string,
+  timeoutMs = 5_000,
+): Promise<Awaited<ReturnType<typeof call>>> {
+  const deadline = Date.now() + timeoutMs
+  let last: Awaited<ReturnType<typeof call>> | undefined
+  while (Date.now() < deadline) {
+    last = await call(ctx, name, args)
+    if (text(last).includes(expected)) return last
+    await new Promise(resolve => setTimeout(resolve, 20))
+  }
+  throw new Error(`tool output did not include ${JSON.stringify(expected)}; last text ${JSON.stringify(last === undefined ? '' : text(last))}`)
+}
+
+describe('registration', () => {
+  it('registers the pwsh tool with its prompt section and schema', async () => {
+    const { ctx } = await setup()
+    const schema = ctx.tools.schemas().find(s => s.name === 'pwsh')
+    expect(schema).toBeDefined()
+    expect(schema?.description).toContain('PowerShell command')
+    expect(schema?.parameters.properties).toMatchObject({
+      command: { type: 'string' },
+      description: { type: 'string' },
+      timeoutMs: { type: 'number' },
+      workdir: { type: 'string' },
+      run_in_background: { type: 'boolean' },
+    })
+    expect(schema?.parameters.required).toEqual(['command', 'description'])
+    const prompt = renderPrompt(await ctx.systemPrompt.assemble())
+    expect(prompt).toContain('Non-zero exits are reported as `[exit code: N]` markers')
+    expect(prompt).toContain('without a signal marker')
+  })
+
+  it('stays pending until ctx.bash exists (inject)', async () => {
+    const ctx = new Context()
+    await ctx.plugin(SystemPrompt)
+    await ctx.plugin(ToolRegistry)
+    await ctx.plugin(ToolPwsh)
+    expect(ctx.tools.schemas()).toHaveLength(0)
+  })
+
+  it('unregisters everything on fiber disposal (HMR safety)', async () => {
+    const ctx = new Context()
+    await ctx.plugin(SystemPrompt)
+    await ctx.plugin(ToolRegistry)
+    await ctx.plugin(BashEnvPlugin)
+    await ctx.plugin(FakeBash)
+    const fiber = await ctx.plugin(ToolPwsh)
+    expect(ctx.tools.schemas()).toHaveLength(1)
+    await fiber.dispose()
+    expect(ctx.tools.schemas()).toHaveLength(0)
+  })
+})
+
+describe('argument validation', () => {
+  it('rejects a blank command or description and a non-positive timeoutMs', async () => {
+    const { ctx } = await setup()
+    expect(text(await call(ctx, 'pwsh', { command: '  ', description: 'd' }))).toContain('expected a non-empty string')
+    expect(text(await call(ctx, 'pwsh', { command: 'Write-Output hi', description: ' ' }))).toContain('expected a non-empty string')
+    expect(text(await call(ctx, 'pwsh', { command: 'Write-Output hi', description: 'd', timeoutMs: -1 })))
+      .toContain('invalid timeoutMs: expected a positive number')
+  })
+})
+
+describe('execution through the bash seam', () => {
+  it('forwards command, session cwd, timeout, and managed DSH_* environment', async () => {
+    const dshHome = mkdtempSync(join(tmpdir(), 'dsh-tool-pwsh-home-'))
+    const { ctx, bash } = await setup({}, dshHome)
+    bash.handler = () => runResult('hi\n')
+    const agent = registerFakeAgent(ctx, 'session-1')
+    Object.assign(agent.session.header, { cwd: '/sessions/s1' })
+    const result = await call(ctx, 'pwsh', {
+      command: 'Write-Output hi',
+      description: 'say hi',
+      timeoutMs: 1234,
+    }, agent)
+    expect(result.isError).toBe(false)
+    const request = bash.requests[0]
+    expect(request?.command).toBe('Write-Output hi')
+    expect(request?.workdir).toBe('/sessions/s1')
+    expect(request?.timeoutMs).toBe(1234)
+    expect(request?.dshEnv).toEqual({
+      DSH_HOME: dshHome,
+      DSH_SHELL: '1',
+      DSH_SESSION_ID: 'session-1',
+    })
+    expect(bash.specs[0]?.workdir).toBe('/sessions/s1')
+  })
+
+  it('resolves a relative workdir against the session cwd, absolute ones verbatim', async () => {
+    const { ctx, bash } = await setup()
+    bash.handler = () => runResult('ok\n')
+    const agent = registerFakeAgent(ctx, 'session-cwd')
+    Object.assign(agent.session.header, { cwd: '/sessions/s1' })
+    await call(ctx, 'pwsh', { command: 'pwd', description: 'cwd', workdir: 'sub/dir' }, agent)
+    expect(bash.requests[0]?.workdir).toBe(resolvePath('/sessions/s1', 'sub/dir'))
+    await call(ctx, 'pwsh', { command: 'pwd', description: 'cwd', workdir: resolvePath('/abs/path') }, agent)
+    expect(bash.requests[1]?.workdir).toBe(resolvePath('/abs/path'))
+  })
+
+  it('omits workdir and the session id without an agent, so executor defaulting applies', async () => {
+    const { ctx, bash } = await setup()
+    bash.handler = () => runResult('ok\n')
+    await call(ctx, 'pwsh', { command: 'Write-Output ok', description: 'ok' })
+    expect(bash.requests[0]).not.toHaveProperty('workdir')
+    const dshEnv = bash.requests[0]?.dshEnv
+    expect(dshEnv).toBeDefined()
+    expect(dshEnv?.['DSH_SHELL']).toBe('1')
+    expect(dshEnv?.['DSH_HOME']).toEqual(expect.any(String))
+    expect(dshEnv).not.toHaveProperty('DSH_SESSION_ID')
+  })
+
+  it('forwards exec.signal into the resolved request', async () => {
+    const { ctx, bash } = await setup()
+    const controller = new AbortController()
+    bash.handler = () => runResult('ok\n')
+    await ctx.tools.execute({
+      signal: controller.signal,
+      callId: CallId('call-signal'),
+      name: 'pwsh',
+      arguments: { command: 'Write-Output ok', description: 'ok' },
+    })
+    expect(bash.requests[0]?.signal).toBe(controller.signal)
+  })
+
+  it('projects the canonical foreground result with stdout, stderr, and exit facts', async () => {
+    const { ctx, bash } = await setup()
+    bash.handler = () => runResult('out\n', {
+      exitCode: 2,
+      stderr: { text: 'err\n', truncated: false },
+      timeoutMs: 5000,
+    })
+    const result = await call(ctx, 'pwsh', { command: 'failing', description: 'fail' })
+    expect(result.isError).toBe(false)
+    if (result.isError) throw new Error('expected pwsh success')
+    expect(result.value).toEqual({
+      kind: 'foreground',
+      exitCode: 2,
+      signal: null,
+      timedOut: false,
+      aborted: false,
+      timeoutMs: 5000,
+      stdout: { text: 'out\n', truncated: false },
+      stderr: { text: 'err\n', truncated: false },
+    })
+    expect(text(result)).toBe('out\n[stderr]\nerr\n[exit code: 2]')
+  })
+
+  it('renders a clean exit without a marker and an empty body as (no output)', async () => {
+    const { ctx, bash } = await setup()
+    bash.handler = () => runResult('hi\n')
+    const clean = await call(ctx, 'pwsh', { command: 'Write-Output hi', description: 'say hi' })
+    expect(text(clean)).toBe('hi\n')
+
+    bash.handler = () => runResult('')
+    const empty = await call(ctx, 'pwsh', { command: 'Write-Output -NoNewline ""', description: 'nothing' })
+    expect(text(empty)).toBe('(no output)')
+  })
+
+  it('renders stderr-only output without a stdout prefix', async () => {
+    const { ctx, bash } = await setup()
+    bash.handler = () => runResult('', {
+      stderr: { text: 'err\n', truncated: false },
+      exitCode: 1,
+    })
+    const result = await call(ctx, 'pwsh', { command: 'fail', description: 'fail' })
+    expect(text(result)).toBe('[stderr]\nerr\n[exit code: 1]')
+  })
+
+  it('inserts the separating newline before the stderr section when stdout lacks one', async () => {
+    const { ctx, bash } = await setup()
+    bash.handler = () => runResult('out', {
+      stderr: { text: 'err\n', truncated: false },
+      exitCode: 1,
+    })
+    const result = await call(ctx, 'pwsh', { command: 'fail', description: 'fail' })
+    expect(text(result)).toBe('out\n[stderr]\nerr\n[exit code: 1]')
+  })
+
+  it('renders the truncation notice with the spill path, then markers', async () => {
+    const { ctx, bash } = await setup()
+    bash.handler = () => runResult('tail', {
+      stdout: { text: 'tail', truncated: true, spillPath: '/spill/out.log' },
+      stderr: { text: '', truncated: false },
+    })
+    const result = await call(ctx, 'pwsh', { command: 'noisy', description: 'noise' })
+    expect(text(result)).toBe('tail\n[output truncated; full output: /spill/out.log]')
+
+    bash.handler = () => runResult('', { timedOut: true, exitCode: null, signal: 'SIGTERM', timeoutMs: 500 })
+    const timedOut = await call(ctx, 'pwsh', { command: 'slow', description: 'slow' })
+    // A timeout kill carries both facts, mirroring the bash tool's markers.
+    expect(text(timedOut)).toBe('(no output)\n[timed out after 500ms]\n[killed by signal: SIGTERM]')
+  })
+
+  it('renders the truncation notice with (unavailable) when no spill path exists', async () => {
+    const { ctx, bash } = await setup()
+    bash.handler = () => runResult('tail', {
+      stdout: { text: 'tail', truncated: true },
+      stderr: { text: '', truncated: false },
+    })
+    const result = await call(ctx, 'pwsh', { command: 'noisy', description: 'noise' })
+    expect(text(result)).toBe('tail\n[output truncated; full output: (unavailable)]')
+  })
+
+  it('translates an aborted run into the TOOL_ABORTED HarnessError', async () => {
+    const { ctx, bash } = await setup()
+    bash.handler = () => runResult('', { aborted: true, exitCode: null, signal: 'SIGTERM' })
+    const result = await call(ctx, 'pwsh', { command: 'Start-Sleep -Seconds 60', description: 'sleep' })
+    expect(result.isError).toBe(true)
+    expect(result.error).toMatchObject({ info: { name: 'AbortError', code: TOOL_ABORTED } })
+  })
+})
+
+describe('background execution through the task runtime', () => {
+  it('run_in_background acks with the task id, readable through the REAL task_output tool', async () => {
+    const { ctx } = await setupWithTasks()
+    const started = await call(ctx, 'pwsh', { command: 'Write-Output bg-ok', description: 'test command', run_in_background: true })
+    expect(started.isError).toBe(false)
+    if (started.isError) throw new Error('expected background pwsh success')
+    expect(started.value).toEqual({ kind: 'background', taskId: 'pwsh-1' })
+    expect(text(started)).toBe('started background task pwsh-1')
+
+    const read = await callUntilText(ctx, 'task_output', { task_id: 'pwsh-1' }, 'bg-ok')
+    expect(text(read)).toContain('bg-ok')
+    // A later read reports the terminal outcome in the generic status line.
+    const final = await callUntilText(ctx, 'task_output', { task_id: 'pwsh-1' }, '[status: completed, exit code: 0]')
+    expect(final.isError).toBe(false)
+  })
+
+  it('a running background task is killable through the REAL task_kill tool', async () => {
+    const { ctx, bash } = await setupWithTasks()
+    bash.backgroundHandler = () => killableProcess()
+    await call(ctx, 'pwsh', { command: 'Start-Sleep -Seconds 60', description: 'test command', run_in_background: true })
+
+    const killed = await call(ctx, 'task_kill', { task_id: 'pwsh-1' })
+    expect(text(killed)).toBe('requested cancellation of task pwsh-1')
+    // The cancel reached the process handle; the task settles as killed with
+    // the signal detail mapped by processOutcome.
+    const final = await call(ctx, 'task_output', { task_id: 'pwsh-1', wait: true })
+    expect(text(final)).toContain('[status: killed, signal: SIGTERM]')
+  })
+
+  it('a background task started by an agent is registered with that agent as owner', async () => {
+    const { ctx } = await setupWithTasks()
+    const agent = registerFakeAgent(ctx, 'sess-owner')
+    const started = await call(ctx, 'pwsh', { command: 'Start-Sleep -Seconds 60', description: 'test command', run_in_background: true }, agent)
+    expect(text(started)).toBe('started background task pwsh-1')
+
+    const anon = await call(ctx, 'task_output', { task_id: 'pwsh-1' })
+    expect(anon.isError).toBe(true)
+    expect(text(anon)).toMatch(/belongs to another session/)
+
+    const killed = await call(ctx, 'task_kill', { task_id: 'pwsh-1' }, agent)
+    expect(killed.isError).toBe(false)
+    await call(ctx, 'task_output', { task_id: 'pwsh-1', wait: true }, agent) // await settlement — no orphan
+  })
+
+  it('fails loud when the task runtime is not loaded', async () => {
+    const { ctx } = await setup() // no LocalTaskService / ToolTasks
+    const result = await call(ctx, 'pwsh', { command: 'Start-Sleep -Seconds 60', description: 'test command', run_in_background: true })
+    expect(result.isError).toBe(true)
+    expect(text(result)).toContain('background tasks unavailable: load @deepseek-ai/dsh-tasks and @deepseek-ai/dsh-tool-tasks')
+  })
+
+  it('a pre-aborted call is skipped before the process starts', async () => {
+    const { ctx, bash } = await setupWithTasks()
+    const controller = new AbortController()
+    controller.abort()
+    const result = await ctx.tools.execute({
+      callId: CallId('call-pre-aborted'),
+      name: 'pwsh',
+      arguments: { command: 'Start-Sleep -Seconds 60', description: 'test command', run_in_background: true },
+      signal: controller.signal,
+    })
+    expect(result.isError).toBe(true)
+    expect(result.error).toEqual({
+      message: 'tool call aborted before dispatch',
+      info: { name: 'AbortError', code: TOOL_ABORTED_BEFORE_DISPATCH },
+    })
+    expect(bash.startCalls).toBe(0)
+  })
+
+  it('never spawns the process when tasks.start preflight throws (no orphan, by construction)', async () => {
+    // With no control surface, task preflight fails before the executor can spawn.
+    const ctx = new Context()
+    await ctx.plugin(SystemPrompt)
+    await ctx.plugin(ToolRegistry)
+    await ctx.plugin(LocalTaskService)
+    await ctx.plugin(BashEnvPlugin)
+    await ctx.plugin(FakeBash)
+    await ctx.plugin(ToolPwsh)
+    const bash = ctx.bash as FakeBash
+
+    const result = await call(ctx, 'pwsh', { command: 'Start-Sleep -Seconds 60', description: 'test command', run_in_background: true })
+    expect(result.isError).toBe(true)
+    expect(text(result)).toContain('no control surface is attached')
+    // Declare-then-execute: the failed preflight means no process ever ran.
+    expect(bash.startCalls).toBe(0)
+  })
+
+  it('enableRunInBackground: false removes the parameter and flips the description', async () => {
+    const { ctx } = await setup({ enableRunInBackground: false })
+    const schema = ctx.tools.schemas().find(s => s.name === 'pwsh')!
+    expect(Object.keys(schema.parameters.properties as Record<string, unknown>))
+      .toEqual(['command', 'description', 'timeoutMs', 'workdir'])
+    expect(schema.description).toContain('Background execution is not available')
+    expect(schema.description).not.toContain('run_in_background')
+
+    // Schema omission is advertising; execution must also enforce the opt-out.
+    const forced = await call(ctx, 'pwsh', { command: 'Write-Output hi', description: 'test command', run_in_background: true })
+    expect(forced.isError).toBe(true)
+    expect(text(forced)).toContain('run_in_background is disabled for this deployment')
+    const foreground = await call(ctx, 'pwsh', { command: 'Write-Output hi', description: 'test command' })
+    expect(foreground.isError).toBe(false)
+  })
+
+  it('applies the built-in background default when apply() receives a bare config', async () => {
+    // Bypasses the schemastery defaults on purpose: apply() must stand on its
+    // own `?? true` fallback when embedded programmatically without the schema.
+    const ctx = new Context()
+    await ctx.plugin(SystemPrompt)
+    await ctx.plugin(ToolRegistry)
+    await ctx.plugin(BashEnvPlugin)
+    await ctx.plugin(FakeBash)
+    ToolPwsh.apply(ctx, {})
+    const schema = ctx.tools.schemas()[0]!
+    expect(schema.parameters.properties).toHaveProperty('run_in_background')
+    expect(schema.description).toContain('task_output')
+  })
+})
+
+describe('UI presentation', () => {
+  it('a real execute renders the console view through the tool definition presenter', async () => {
+    const { ctx, bash } = await setup()
+    bash.handler = () => runResult('hi\n')
+    const args = { command: 'Write-Output hi', description: 'say hi' }
+    const result = await call(ctx, 'pwsh', args)
+    const view = ctx.tools.get('pwsh')?.presentResult?.(args, result)
+    expect(view).toEqual({
+      card: 'generic',
+      content: [{ type: 'text', text: '```console\nhi\n```' }],
+    })
+  })
+
+  it('the pending call view is a terminal card carrying command, description, and optional cwd', async () => {
+    const { ctx } = await setup()
+    const definition = ctx.tools.get('pwsh')
+    expect(definition?.presentCall?.({ command: 'Get-Process', description: 'List processes' }))
+      .toEqual({ card: 'terminal', title: 'Get-Process', description: 'List processes' })
+    expect(definition?.presentCall?.({ command: 'Get-Process', description: 'List processes', workdir: 'C:\\work' }))
+      .toMatchObject({ cwd: 'C:\\work' })
+  })
+
+  it('a background pending call renders the generic card like the bash tool', async () => {
+    const { ctx } = await setup()
+    const definition = ctx.tools.get('pwsh')
+    expect(definition?.presentCall?.({
+      command: 'Start-Sleep -Seconds 60',
+      description: 'long wait',
+      run_in_background: true,
+    })).toEqual({
+      card: 'generic',
+      title: 'Start-Sleep -Seconds 60',
+      kind: 'execute',
+      rawInput: 'Start-Sleep -Seconds 60',
+      content: [{ type: 'text', text: 'long wait' }],
+    })
+  })
+
+  it('presentResult falls back to undefined for multi-block or non-text content', async () => {
+    const { ctx } = await setup()
+    const definition = ctx.tools.get('pwsh')
+    const args = { command: 'Write-Output hi', description: 'say hi' }
+    const multi = { content: [{ type: 'text' as const, text: 'a' }, { type: 'text' as const, text: 'b' }], isError: false }
+    expect(definition?.presentResult?.(args, multi as never)).toBeUndefined()
+    const image = { content: [{ type: 'image' as const, text: 'a' }], isError: false }
+    expect(definition?.presentResult?.(args, image as never)).toBeUndefined()
+  })
+})
+
+describe('renderPwshProcessRead', () => {
+  const base: BashProcessRead = { delta: 'out\n', lossy: false }
+
+  it('returns the delta verbatim for a lossless read', () => {
+    expect(renderPwshProcessRead(base)).toBe('out\n')
+    expect(renderPwshProcessRead({ delta: '', lossy: false })).toBe('')
+  })
+
+  it('appends the loss notice with the available spill paths', () => {
+    expect(renderPwshProcessRead({ ...base, lossy: true, stdoutSpillPath: 'C:\\spill\\out.log' }))
+      .toBe('out\n[some output was dropped from memory; full output: C:\\spill\\out.log]')
+    expect(renderPwshProcessRead({
+      ...base,
+      lossy: true,
+      stdoutSpillPath: 'C:\\spill\\out.log',
+      stderrSpillPath: 'C:\\spill\\err.log',
+    }))
+      .toBe('out\n[some output was dropped from memory; full output: C:\\spill\\out.log, C:\\spill\\err.log]')
+  })
+
+  it('reports (unavailable) when a lossy read has no safe spill path', () => {
+    expect(renderPwshProcessRead({ ...base, lossy: true }))
+      .toBe('out\n[some output was dropped from memory; full output: (unavailable)]')
+  })
+
+  it('an empty lossy delta is the notice alone', () => {
+    expect(renderPwshProcessRead({ delta: '', lossy: true, stderrSpillPath: 'C:\\spill\\err.log' }))
+      .toBe('[some output was dropped from memory; full output: C:\\spill\\err.log]')
+  })
+
+  it('inserts the separating newline only when the delta lacks one', () => {
+    expect(renderPwshProcessRead({ delta: 'tail', lossy: true }))
+      .toBe('tail\n[some output was dropped from memory; full output: (unavailable)]')
+    expect(renderPwshProcessRead({ delta: 'tail\n', lossy: true }))
+      .toBe('tail\n[some output was dropped from memory; full output: (unavailable)]')
+  })
+})
+
+describe('processOutcome', () => {
+  function settled(over: Partial<BashProcess>): BashProcess {
+    return {
+      status: 'completed',
+      exitCode: 0,
+      signal: null,
+      done: Promise.resolve(),
+      readOutput: () => ({ delta: '', lossy: false }),
+      kill: () => false,
+      ...over,
+    }
+  }
+
+  it('maps a signal-killed process to killed with the signal detail', () => {
+    expect(processOutcome(settled({ status: 'killed', signal: 'SIGTERM' })))
+      .toEqual({ status: 'killed', detail: 'signal: SIGTERM' })
+  })
+
+  it('maps a killed process without a recorded signal (kill raced exit / spawn failure)', () => {
+    expect(processOutcome(settled({ status: 'killed', exitCode: null })))
+      .toEqual({ status: 'killed', detail: 'killed before exit' })
+  })
+
+  it('maps a completed process to its exit code', () => {
+    expect(processOutcome(settled({ exitCode: 3 })))
+      .toEqual({ status: 'completed', detail: 'exit code: 3' })
+  })
+
+  it('defensively reads a null exit code as 0 (handle shapes from other executors)', () => {
+    expect(processOutcome(settled({ exitCode: null })))
+      .toEqual({ status: 'completed', detail: 'exit code: 0' })
+  })
+})

packages/bash/tool-pwsh/tsconfig.json

@@ -0,0 +1,45 @@
+{
+  "extends": "../../../tsconfig.base.json",
+  "compilerOptions": {
+    "rootDir": "src",
+    "outDir": "lib/types"
+  },
+  "include": [
+    "src"
+  ],
+  "references": [
+    {
+      "path": "../../../vendor/cosmokit"
+    },
+    {
+      "path": "../../../vendor/cordis"
+    },
+    {
+      "path": "../../../vendor/schemastery"
+    },
+    {
+      "path": "../../llm/llm"
+    },
+    {
+      "path": "../../core/tools"
+    },
+    {
+      "path": "../../core/agent"
+    },
+    {
+      "path": "../../bash/bash"
+    },
+    {
+      "path": "../../bash/bash-env"
+    },
+    {
+      "path": "../../tasks/tasks"
+    },
+    {
+      "path": "../../core/system-prompt"
+    },
+    {
+      "path": "../../support/invariants"
+    }
+  ]
+}

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

@@ -184,7 +184,7 @@ export const SERVICE_API: readonly ServiceApiEntry[] = [
       },
       {
         signature: 'collect(execution: ToolExecution): DshEnvironment',
-        jsDoc: '/**\n * Build the trusted `DSH_*` snapshot for one bash tool execution.\n * @param execution - the current tool execution.\n * @returns an immutable environment overlay containing built-ins and current contributions.\n */',
+        jsDoc: '/**\n * Build the trusted `DSH_*` snapshot for one shell tool execution.\n * @param execution - the current tool execution.\n * @returns an immutable environment overlay containing built-ins and current contributions.\n */',
       },
       {
         signature: 'list(): BashEnvVariableInfo[]',

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

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

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

@@ -2,5 +2,5 @@
 # side as of the last confirmed-consistent state. Both languages carry equal authority;
 # after editing either side, bring the other along and re-record with:
 #   pnpm run verify-translation-pairing --write packages/examples/agent-spine-demo/README.md
-README.md: 34d68b0791746c28528124853a4d8ea82b68138d
-README.zh.md: 1b0a644595e35d8703d0600812268b0950b79182
+README.md: 7ea2f4afbe5d0bea62cf0fc2c7ecdd1496d20aef
+README.zh.md: cb4202ac0e72db7c85967425671144e743f31b62

packages/examples/agent-spine-demo/README.md

@@ -59,7 +59,7 @@ import type { Config } from '@deepseek-ai/dsh-agent-spine-demo'
 // workspaceContext requires { maxBytes } or false; the other owner schemas supply defaults.
 ```
 
-The bundle FORWARDS each field to the child that owns it: `agents` and `maxParallelToolCalls` to `agent-loop` (`agents` defaults to `[]`; the cap defaults there), so each app supplies its own pre-created agents — TUI and headless apps pre-create `main`, while the ACP app creates agents on demand at `session/new`; `includeHarnessIdentity`, `persona`, and `toolOrder` to `dsh-system-prompt`; `tools` to the tool registry for its presentation mode; `sessionTitle` to the fallback title service; `skills.registry`, `skills.local`, and `skills.tool` to the skill registry, local provider, and model-facing consumer; the required `workspaceContext` choice to `dsh-workspace-context` (`{ maxBytes }` enables loading and `false` disables it); `invariants` to the invariant service; and `toolBash`/`toolTasks` to the two model-facing tool plugins the bundle owns. It always mounts `dsh-llm-retry`, while each leaf adapter owns its nested `retryPolicy`. Omitted `sessionTitle` uses the explicit example policy of 5 words, 40 fallback bytes, and 80 accepted-title bytes. A `goals` object opts into the persisted domain, model tools, and same-session driver while forwarding `goals.domain` and `goals.tool` to their owners; omission or `false` leaves the stack absent so headless callers retain one-turn settlement. Set `skills.enabled: false` to omit both the local provider and model-facing skill tool, set `toolBash: false` when another plugin owns the `bash` tool name, and set `toolTasks: false` to retain the task service for foreground producers without exposing `task_output` / `task_list` / `task_kill`. It resolves `dshHome` once through [`@deepseek-ai/dsh-paths`](../../util/paths/README.md) and forwards that absolute value to tool-bash's managed environment and enabled local skill discovery. An absent top-level `dshHome` adopts `skills.local.dshHome`; supplying both with different resolved paths fails loudly. `toolBash.enableRunInBackground` controls only the bundled bash producer; independently loaded producers keep their own config. Workspace instructions register before the skill catalog so their session-prefix message renders first. App packages use `pickSpineConfig()` to copy only these bundle-owned fields.
+The bundle FORWARDS each field to the child that owns it: `agents` and `maxParallelToolCalls` to `agent-loop` (`agents` defaults to `[]`; the cap defaults there), so each app supplies its own pre-created agents — TUI and headless apps pre-create `main`, while the ACP app creates agents on demand at `session/new`; `includeHarnessIdentity`, `persona`, and `toolOrder` to `dsh-system-prompt`; `tools` to the tool registry for its presentation mode; `sessionTitle` to the fallback title service; `skills.registry`, `skills.local`, and `skills.tool` to the skill registry, local provider, and model-facing consumer; the required `workspaceContext` choice to `dsh-workspace-context` (`{ maxBytes }` enables loading and `false` disables it); `invariants` to the invariant service; and `toolBash`/`toolTasks` to the two model-facing tool plugins the bundle owns. It always mounts `dsh-llm-retry`, while each leaf adapter owns its nested `retryPolicy`. Omitted `sessionTitle` uses the explicit example policy of 5 words, 40 fallback bytes, and 80 accepted-title bytes. A `goals` object opts into the persisted domain, model tools, and same-session driver while forwarding `goals.domain` and `goals.tool` to their owners; omission or `false` leaves the stack absent so headless callers retain one-turn settlement. Set `skills.enabled: false` to omit both the local provider and model-facing skill tool, set `toolBash: false` when another plugin owns the `bash` tool name, and set `toolTasks: false` to retain the task service for foreground producers without exposing `task_output` / `task_list` / `task_kill`. It resolves `dshHome` once through [`@deepseek-ai/dsh-paths`](../../util/paths/README.md) and forwards that absolute value to the shared `bash-env` managed environment and enabled local skill discovery. An absent top-level `dshHome` adopts `skills.local.dshHome`; supplying both with different resolved paths fails loudly. `toolBash.enableRunInBackground` controls only the bundled bash producer; independently loaded producers keep their own config. Workspace instructions register before the skill catalog so their session-prefix message renders first. App packages use `pickSpineConfig()` to copy only these bundle-owned fields.
 
 For example, `{ invariants: { enabled: true, package_allowlist: ['^@deepseek-ai/dsh-'], package_blocklist: ['agent-loop$'] } }` keeps the package-owned companions mounted but suppresses the blocked owner. Blocklist matches override allowlist matches; see [`dsh-invariants`](../../support/invariants/README.md) for regex and lifecycle rules.
 

packages/examples/agent-spine-demo/README.zh.md

@@ -59,7 +59,7 @@ import type { Config } from '@deepseek-ai/dsh-agent-spine-demo'
 // workspaceContext requires { maxBytes } or false; the other owner schemas supply defaults.
 ```
 
-组合包将每个字段转发给拥有它的子节点：`agents` 与 `maxParallelToolCalls` 交给 `agent-loop`（`agents` 默认为 `[]`，上限在该处默认），因此每个应用提供自己的预创建 agent；TUI 和无头应用预创建 `main`，ACP 应用则在 `session/new` 按需创建 agent；`includeHarnessIdentity`、`persona` 与 `toolOrder` 交给 `dsh-system-prompt`；`tools` 交给工具注册表以配置呈现模式；`sessionTitle` 交给后备标题服务；`skills.registry`、`skills.local` 与 `skills.tool` 分别交给 skill 注册表、本地提供方和面向模型的消费方；必填的 `workspaceContext` 选择交给 `dsh-workspace-context`（`{ maxBytes }` 启用加载，`false` 禁用）；`invariants` 交给不变式服务；`toolBash`/`toolTasks` 交给组合包拥有的两个面向模型工具插件。组合包始终挂载 `dsh-llm-retry`，而每个叶节点适配器拥有自己的嵌套 `retryPolicy`。省略 `sessionTitle` 时采用显式示例策略：5 个词、40 个后备字节、80 个可接受标题字节。`goals` 对象会选用持久化领域、模型工具和同会话 Goal Round 驱动器，并将 `goals.domain` 与 `goals.tool` 转发给各自拥有者；省略或设为 `false` 会让整个栈缺席，使无头调用方继续以单轮次结算。设置 `skills.enabled: false` 会同时省略本地提供方和面向模型的 skill 工具；当另一个插件拥有 `bash` 工具名时设置 `toolBash: false`；设置 `toolTasks: false` 会保留供前台生产方使用的任务服务，但不公开 `task_output`/`task_list`/`task_kill`。它对 `dshHome` 只解析一次，解析通过 [`@deepseek-ai/dsh-paths`](../../util/paths/README.md) 完成，并将所得绝对值转发给 tool-bash 的托管环境和已启用的本地 skill 发现。顶层 `dshHome` 缺席时采用 `skills.local.dshHome`；两者同时提供但解析后的路径不同会明确失败。`toolBash.enableRunInBackground` 只控制内置 bash 生产方；独立加载的生产方保留各自配置。工作区指令先于 skill 目录注册，因此其会话前缀消息先渲染。应用包使用 `pickSpineConfig()`，只复制这些由组合包拥有的字段。
+组合包将每个字段转发给拥有它的子节点：`agents` 与 `maxParallelToolCalls` 交给 `agent-loop`（`agents` 默认为 `[]`，上限在该处默认），因此每个应用提供自己的预创建 agent；TUI 和无头应用预创建 `main`，ACP 应用则在 `session/new` 按需创建 agent；`includeHarnessIdentity`、`persona` 与 `toolOrder` 交给 `dsh-system-prompt`；`tools` 交给工具注册表以配置呈现模式；`sessionTitle` 交给后备标题服务；`skills.registry`、`skills.local` 与 `skills.tool` 分别交给 skill 注册表、本地提供方和面向模型的消费方；必填的 `workspaceContext` 选择交给 `dsh-workspace-context`（`{ maxBytes }` 启用加载，`false` 禁用）；`invariants` 交给不变式服务；`toolBash`/`toolTasks` 交给组合包拥有的两个面向模型工具插件。组合包始终挂载 `dsh-llm-retry`，而每个叶节点适配器拥有自己的嵌套 `retryPolicy`。省略 `sessionTitle` 时采用显式示例策略：5 个词、40 个后备字节、80 个可接受标题字节。`goals` 对象会选用持久化领域、模型工具和同会话 Goal Round 驱动器，并将 `goals.domain` 与 `goals.tool` 转发给各自拥有者；省略或设为 `false` 会让整个栈缺席，使无头调用方继续以单轮次结算。设置 `skills.enabled: false` 会同时省略本地提供方和面向模型的 skill 工具；当另一个插件拥有 `bash` 工具名时设置 `toolBash: false`；设置 `toolTasks: false` 会保留供前台生产方使用的任务服务，但不公开 `task_output`/`task_list`/`task_kill`。它对 `dshHome` 只解析一次，解析通过 [`@deepseek-ai/dsh-paths`](../../util/paths/README.md) 完成，并将所得绝对值转发给共享 `bash-env` 的托管环境和已启用的本地 skill 发现。顶层 `dshHome` 缺席时采用 `skills.local.dshHome`；两者同时提供但解析后的路径不同会明确失败。`toolBash.enableRunInBackground` 只控制内置 bash 生产方；独立加载的生产方保留各自配置。工作区指令先于 skill 目录注册，因此其会话前缀消息先渲染。应用包使用 `pickSpineConfig()`，只复制这些由组合包拥有的字段。
 
 例如，`{ invariants: { enabled: true, package_allowlist: ['^@deepseek-ai/dsh-'], package_blocklist: ['agent-loop$'] } }` 会让包拥有的配套插件保持挂载，但抑制被阻止的拥有者。Blocklist 匹配优先于 allowlist 匹配；正则表达式与生命周期规则见 [`dsh-invariants`](../../support/invariants/README.md)。
 

packages/examples/agent-spine-demo/package.json

@@ -43,6 +43,7 @@
     "@deepseek-ai/dsh-skill-local": "^0.0.1",
     "@deepseek-ai/dsh-system-prompt": "^0.0.1",
     "@deepseek-ai/dsh-tasks-local": "^0.0.1",
+    "@deepseek-ai/dsh-bash-env": "^0.0.1",
     "@deepseek-ai/dsh-tool-bash": "^0.0.1",
     "@deepseek-ai/dsh-tool-goal": "^0.0.1",
     "@deepseek-ai/dsh-tool-skill": "^0.0.1",
@@ -55,6 +56,7 @@
     "@cordisjs/plugin-timer": "workspace:^",
     "@deepseek-ai/dsh-agent": "workspace:^",
     "@deepseek-ai/dsh-agent-loop": "workspace:^",
+    "@deepseek-ai/dsh-bash-env": "workspace:^",
     "@deepseek-ai/dsh-bash-local": "workspace:^",
     "@deepseek-ai/dsh-bash-sandbox": "workspace:^",
     "@deepseek-ai/dsh-fs-local": "workspace:^",

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

@@ -29,6 +29,7 @@ import * as agentInvariant from '@deepseek-ai/dsh-agent/invariant'
 import * as scopeInvariant from '@deepseek-ai/dsh-scope/invariant'
 import * as agentLoopInvariant from '@deepseek-ai/dsh-agent-loop/invariant'
 import * as toolBash from '@deepseek-ai/dsh-tool-bash'
+import * as bashEnv from '@deepseek-ai/dsh-bash-env'
 import * as workspaceContext from '@deepseek-ai/dsh-workspace-context'
 import * as toolSkill from '@deepseek-ai/dsh-tool-skill'
 import * as toolTasks from '@deepseek-ai/dsh-tool-tasks'
@@ -234,7 +235,8 @@ export function apply(ctx: Context, config: Config): void {
   ctx.plugin(scopeInvariant)
   ctx.plugin(agentLoopInvariant)
   if (config.toolBash !== false) {
-    ctx.plugin(toolBash, Object.assign({}, config.toolBash, { dshHome }))
+    ctx.plugin(bashEnv, { dshHome })
+    ctx.plugin(toolBash, config.toolBash ?? {})
   }
   if (config.workspaceContext !== false) {
     ctx.plugin(workspaceContext, config.workspaceContext)

packages/examples/agent-spine-demo/tsconfig.json

@@ -68,6 +68,9 @@
     {
       "path": "../../util/paths"
     },
+    {
+      "path": "../../bash/bash-env"
+    },
     {
       "path": "../../bash/tool-bash"
     },

packages/sdk/helper/src/features/builtin/index.ts

@@ -34,6 +34,7 @@ export function createBuiltinRegistry(profile: ProjectProfile): FeatureRegistry
       required: true,
       baseResources: [
         { kind: 'npm-cordis-config-entry', id: 'subprocess', package: '@deepseek-ai/dsh-subprocess-local' },
+        { kind: 'npm-cordis-config-entry', id: 'bash-env', package: '@deepseek-ai/dsh-bash-env' },
         { kind: 'npm-cordis-config-entry', id: 'tool-bash', package: '@deepseek-ai/dsh-tool-bash' },
       ],
       options: [

packages/subagent/subagent-spawn/tests/harness.ts

@@ -3,6 +3,7 @@ import type { Agent } from '@deepseek-ai/dsh-agent'
 import AgentLoop from '@deepseek-ai/dsh-agent-loop'
 import { mountAgentLoopTestDependencies } from '@deepseek-ai/dsh-agent-loop-testkit'
 import { LocalBashExecutor } from '@deepseek-ai/dsh-bash-local'
+import * as BashEnvPlugin from '@deepseek-ai/dsh-bash-env'
 import LocalSubprocessService from '@deepseek-ai/dsh-subprocess-local'
 import * as ToolBash from '@deepseek-ai/dsh-tool-bash'
 import * as LlmDeepSeek from '@deepseek-ai/dsh-llm-deepseek'
@@ -29,6 +30,7 @@ export async function spawnHarness(workdir: string): Promise<Context> {
   await ctx.plugin(AgentLoop, { agents: [] })
   await ctx.plugin(LlmDeepSeek)
   await ctx.plugin(LocalSubprocessService)
+  await ctx.plugin(BashEnvPlugin)
   await ctx.plugin(LocalBashExecutor, { cwd: workdir, timeoutMs: 30_000 })
   await ctx.plugin(ToolBash)
   await ctx.plugin(SubagentService)

packages/subprocess/subprocess/src/index.ts

@@ -45,7 +45,10 @@ export const SENSITIVE_ENV_PATTERN = /KEY|PASSWORD|SECRET|TOKEN/i
  * `HOME`, locale, and proxy variables survive, so child CLIs run normally;
  * harness identity never leaks implicitly (a deliberately forwarded
  * credential or current `DSH_*` fact goes through the spec's explicit `env`,
- * which merges after this scrub). Exported as a plain function so spawners
+ * which merges after this scrub). Both scrubs match case-insensitively:
+ * Windows environment names are case-insensitive, so a parent `dsh_*` entry
+ * would otherwise survive and read back as `$env:DSH_*` in the child;
+ * deliberate lowercase `dsh_*` names on POSIX are implausible. Exported as a plain function so spawners
  * that cannot route through the service (node-pty backends, SDK-managed
  * transports) share the one scrub definition.
  * @returns a fresh environment object safe to hand to a child spawn.
@@ -53,7 +56,7 @@ export const SENSITIVE_ENV_PATTERN = /KEY|PASSWORD|SECRET|TOKEN/i
 export function scrubbedParentEnv(): Record<string, string> {
   const env: Record<string, string> = {}
   for (const [key, value] of Object.entries(process.env)) {
-    if (value !== undefined && !SENSITIVE_ENV_PATTERN.test(key) && !key.startsWith(DSH_ENV_PREFIX)) env[key] = value
+    if (value !== undefined && !SENSITIVE_ENV_PATTERN.test(key) && !key.toUpperCase().startsWith(DSH_ENV_PREFIX)) env[key] = value
   }
   return env
 }

packages/subprocess/subprocess/tests/service.spec.ts

@@ -52,20 +52,23 @@ describe('SubprocessService seam', () => {
     await expect(ctx.plugin(SecondService)).rejects.toThrow(/service "subprocess" has been registered/)
   })
 
-  it('scrubbedParentEnv drops credential-shaped and DSH_ names but keeps PATH', () => {
+  it('scrubbedParentEnv drops credential-shaped and DSH_ names (case-insensitively) but keeps PATH', () => {
     process.env.DSH_SCRUB_PROBE = 'stale'
+    process.env.dsh_scrub_probe_lower = 'stale'
     process.env.SCRUB_PROBE_TOKEN = 'secret'
     process.env.SCRUB_PROBE_PASSWORD = 'secret'
     process.env.SCRUB_PROBE_PLAIN = 'visible'
     try {
       const env = scrubbedParentEnv()
       expect(env.DSH_SCRUB_PROBE).toBeUndefined()
+      expect(env.dsh_scrub_probe_lower).toBeUndefined()
       expect(env.SCRUB_PROBE_TOKEN).toBeUndefined()
       expect(env.SCRUB_PROBE_PASSWORD).toBeUndefined()
       expect(env.SCRUB_PROBE_PLAIN).toBe('visible')
       expect(env.PATH).toBeDefined()
     } finally {
       delete process.env.DSH_SCRUB_PROBE
+      delete process.env.dsh_scrub_probe_lower
       delete process.env.SCRUB_PROBE_TOKEN
       delete process.env.SCRUB_PROBE_PASSWORD
       delete process.env.SCRUB_PROBE_PLAIN

packages/support/acp-snapshot/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/support/acp-snapshot/README.md
-README.md: e7988733827ef1d4de67d6d49764a4836e33d17c
-README.zh.md: e2466feb5e2025cb99f252b4206bfacb711bccda
+README.md: c8fe6907848a7b661c4bfb60c871f077753fda8b
+README.zh.md: 0aa28f4b2c3df1a30e5fd33a80401712f81d6614

packages/support/acp-snapshot/README.md

@@ -55,7 +55,7 @@ A scenario booting a differently-composed tree sets its own `configPath` (an ove
 
 A pin owns its generated `system-prompt.expected.md` or `tool-schemas.expected.json` by default; `systemPromptSource` and `toolSchemasSource` name another pin when the complete corresponding sequence is identical, so each distinct version is committed once. The pin's `session.jsonl` stores `"system":"{{system}}","tools":"{{tools}}"` while retaining config, reason, and any model-visible prefix. A pin with legitimate mid-run header changes declares `expectedHeaderChanges`; a shared source must declare the same count, and record/refresh rejects claimants that generate different bytes.
 
-Every scenario compares `stdout.expected.jsonl` with cwd-rooted separators canonicalized to `/`. On Windows, `pinsNativeWindowsStdout` additionally compares the complete `stdout.expected.windows.jsonl` after the shared expected output and requires that sidecar exactly when enabled. A scenario requiring a non-Windows host declares `posixOnly`, which skips its run test on Windows while the fixture guards keep covering its committed files everywhere; examples include POSIX process semantics (e.g. cancelling a live bash call kills a detached process group) and generated paths Windows cannot represent.
+Every scenario compares `stdout.expected.jsonl` with cwd-rooted separators canonicalized to `/`. On Windows, `pinsNativeWindowsStdout` additionally compares the complete `stdout.expected.windows.jsonl` after the shared expected output and requires that sidecar exactly when enabled. A scenario requiring a non-Windows host declares `posixOnly`, which skips its run test on Windows while the fixture guards keep covering its committed files everywhere; examples include POSIX process semantics (e.g. cancelling a live bash call kills a detached process group) and generated paths Windows cannot represent. A scenario whose composition needs a usable `pwsh` declares `pwshOnly`; the caller-supplied `hasPwsh` probe (the shipped acp-agent suite follows the executor's own resolution, so Program Files installs count) skips the run test when no usable `pwsh` resolves while the fixture guards keep covering its committed files everywhere.
 
 The example also ships a `cordis.snapshot.yml` replay overlay next to its `cordis.yml` (the bin swaps them under `DSH_SNAPSHOT=replay` — [single-source replay config Agent Note](../../../.agents/notes/archived/testing/2026-07-04-single-source-acp-replay-config.md)); replay fixtures are served by [`dsh-llm-replay`](../llm-replay/README.md), which this package points at via the `DSH_SNAPSHOT_*` env vars it sets on the child. `pnpm run test:snapshot:record` calls the live LLM and rewrites the recorded scenarios' model fixtures; `pnpm run test:snapshot:refresh` stays keyless, runs the replay overlay, and rewrites stdout, comparable session-log expected outputs, and owned prompt and tool-schema sidecars from the committed model scripts. Fixture roles, record/replay/refresh semantics, and scenario-table fields are documented on `Scenario` and in the [snapshot Agent Note](../../../.agents/notes/implemented/testing/2026-06-19-acp-snapshot-tests.md).
 

packages/support/acp-snapshot/README.zh.md

@@ -55,7 +55,7 @@ defineAcpSnapshotSuite({
 
 每个 pin 默认拥有其生成的 `system-prompt.expected.md` 或 `tool-schemas.expected.json`；当完整的对应序列相同时，`systemPromptSource` 和 `toolSchemasSource` 指定另一个 pin 作为来源，因此每个不同版本只提交一次。该 pin 的 `session.jsonl` 存储 `"system":"{{system}}","tools":"{{tools}}"`，同时保留配置、原因和任何模型可见前缀。具有合法运行中 header 变更的 pin 声明 `expectedHeaderChanges`；共享来源必须声明相同的 header 变更数量，录制/刷新会拒绝生成不同字节的共享引用方。
 
-每个场景都比较 `stdout.expected.jsonl`，其中以 cwd 为根的分隔符规范化为 `/`。在 Windows 上，`pinsNativeWindowsStdout` 还会在共享预期输出之后比较完整 `stdout.expected.windows.jsonl`，并在启用时精确要求该 sidecar。需要非 Windows 主机的场景声明 `posixOnly`，在 Windows 上跳过运行测试，但 fixture 保护仍在所有平台覆盖其已提交文件；示例包括 POSIX 进程语义（例如取消实时 bash 调用会终止脱离进程组）和 Windows 无法表示的生成路径。
+每个场景都比较 `stdout.expected.jsonl`，其中以 cwd 为根的分隔符规范化为 `/`。在 Windows 上，`pinsNativeWindowsStdout` 还会在共享预期输出之后比较完整 `stdout.expected.windows.jsonl`，并在启用时精确要求该 sidecar。需要非 Windows 主机的场景声明 `posixOnly`，在 Windows 上跳过运行测试，但 fixture 保护仍在所有平台覆盖其已提交文件；示例包括 POSIX 进程语义（例如取消实时 bash 调用会终止脱离进程组）和 Windows 无法表示的生成路径。组合需要可用 `pwsh` 的场景声明 `pwshOnly`；调用方提供的 `hasPwsh` 探测（随附的 acp-agent 套件遵循执行器自身的解析，因此 Program Files 安装也计入）在解析不到可用 `pwsh` 时跳过运行测试，而 fixture 保护仍处处覆盖其已提交文件。
 
 示例还发布 `cordis.snapshot.yml` 回放 overlay，位于 `cordis.yml` 旁边（bin 在 `DSH_SNAPSHOT=replay` 下交换它们，见[单源回放配置 Agent Note](../../../.agents/notes/archived/testing/2026-07-04-single-source-acp-replay-config.md)）；回放 fixture 由 [`dsh-llm-replay`](../llm-replay/README.md) 提供，该包通过对子级设置的 `DSH_SNAPSHOT_*` env var 指向它。`pnpm run test:snapshot:record` 调用实时 LLM，并重写已记录场景的模型 fixture；`pnpm run test:snapshot:refresh` 保持无密钥，运行回放 overlay，并从已提交模型脚本重写 stdout、可比较会话日志预期输出，以及各 pin 自有的提示词与工具 schema sidecar。Fixture 角色、录制/回放/刷新语义和场景表字段记录在 `Scenario` 以及[快照 Agent Note](../../../.agents/notes/implemented/testing/2026-06-19-acp-snapshot-tests.md) 中。
 

packages/support/acp-snapshot/src/suite.ts

@@ -161,25 +161,37 @@ export interface Scenario {
    * test is skipped on Windows; its fixtures stay guarded on every platform.
    */
   posixOnly?: boolean
+  /**
+   * Whether the scenario boots a composition that needs a usable `pwsh`
+   * (the pwsh-tool-turn scenario). The run test is skipped when the suite's
+   * {@link SnapshotSuiteOptions.hasPwsh} probe is false; fixtures stay guarded
+   * on every platform.
+   */
+  pwshOnly?: boolean
 }
 
 /**
  * Whether a scenario's run test is skipped for this mode and host: record mode
- * skips authored (non-`recorded`) scenarios, and {@link Scenario.posixOnly}
- * scenarios skip on Windows.
+ * skips authored (non-`recorded`) scenarios, {@link Scenario.posixOnly}
+ * scenarios skip on Windows, and {@link Scenario.pwshOnly} scenarios skip
+ * when the caller's `hasPwsh` probe is false.
  *
  * @param scenario The scenario whose run test is being registered.
  * @param recording Whether the suite runs in record mode.
  * @param platform The running Node platform, injectable for unit coverage.
+ * @param hasPwsh The caller's pwsh-availability probe; `pwshOnly` scenarios
+ *   skip unless it is true.
  * @returns True when the scenario's run test must not execute.
  */
 export function scenarioSkipped(
   scenario: Scenario,
   recording: boolean,
   platform: NodeJS.Platform = process.platform,
+  hasPwsh?: boolean,
 ): boolean {
   if (recording && !scenario.recorded) return true
-  return scenario.posixOnly === true && platform === 'win32'
+  if (scenario.posixOnly === true && platform === 'win32') return true
+  return scenario.pwshOnly === true && hasPwsh !== true
 }
 
 /** One stdout expected output selected for a platform run. */
@@ -220,6 +232,11 @@ export interface SnapshotSuiteOptions {
    * from `$DSH_SNAPSHOT` — env reading stays outside this library.
    */
   mode: 'replay' | 'record' | 'refresh'
+  /**
+   * Whether a real `pwsh` executable is available on this host (the probe the
+   * caller owns; `pwshOnly` scenarios skip when this is not true).
+   */
+  hasPwsh?: boolean
 }
 
 /** One scenario's generated claim on a shared snapshot file. */
@@ -973,8 +990,9 @@ export function defineAcpSnapshotSuite(options: SnapshotSuiteOptions): void {
   scenarioSuite('snapshot scenarios', () => {
     for (const scenario of scenarios) {
       // In RECORD mode, only re-run the `recorded` (live-API) scenarios; the `authored` ones
-      // (sidecar-driven errors/cancel) are never re-recorded. `posixOnly` scenarios skip on Windows.
-      it.skipIf(scenarioSkipped(scenario, RECORDING))(`snapshot: ${scenario.name} matches the expected outputs`, async ({ expect }) => {
+      // (sidecar-driven errors/cancel) are never re-recorded. `posixOnly` scenarios skip on Windows;
+      // `pwshOnly` scenarios skip when the caller's `hasPwsh` probe is false.
+      it.skipIf(scenarioSkipped(scenario, RECORDING, process.platform, options.hasPwsh))(`snapshot: ${scenario.name} matches the expected outputs`, async ({ expect }) => {
         const dir = join(snapshotsDir, scenario.name)
         const input = JSON.parse(await readFile(join(dir, 'input.json'), 'utf8')) as InputScript
         const overrideFile = join(dir, 'replay.override.json')

packages/support/acp-snapshot/tests/suite.spec.ts

@@ -459,6 +459,7 @@ describe('stdoutExpectedVariants', () => {
 describe('scenarioSkipped', () => {
   const authored: Scenario = { name: 'authored', hasModelTurn: true, recorded: false }
   const posix: Scenario = { name: 'posix-cancel', hasModelTurn: true, recorded: false, posixOnly: true }
+  const pwsh: Scenario = { name: 'pwsh-tool', hasModelTurn: true, recorded: false, pwshOnly: true }
 
   it('skips authored scenarios only while recording', () => {
     expect(scenarioSkipped(authored, true, 'linux')).toBe(true)
@@ -471,6 +472,13 @@ describe('scenarioSkipped', () => {
     expect(scenarioSkipped(posix, false, 'darwin')).toBe(false)
     expect(scenarioSkipped(authored, false, 'win32')).toBe(false)
   })
+
+  it('skips pwshOnly scenarios when the host lacks pwsh, and runs them otherwise', () => {
+    expect(scenarioSkipped(pwsh, false, 'linux', false)).toBe(true)
+    expect(scenarioSkipped(pwsh, false, 'win32', true)).toBe(false)
+    expect(scenarioSkipped(pwsh, false, 'linux', true)).toBe(false)
+    expect(scenarioSkipped(authored, false, 'linux', false)).toBe(false)
+  })
 })
 
 describe('fixtureContext', () => {

pnpm-lock.yaml

@@ -146,6 +146,9 @@ importers:
       '@deepseek-ai/dsh-app-boot':
         specifier: workspace:^
         version: link:../../packages/ui/app-boot
+      '@deepseek-ai/dsh-bash-env':
+        specifier: workspace:^
+        version: link:../../packages/bash/bash-env
       '@deepseek-ai/dsh-bash-local':
         specifier: workspace:^
         version: link:../../packages/bash/bash-local
@@ -305,6 +308,9 @@ importers:
       '@deepseek-ai/dsh-pty-local':
         specifier: workspace:^
         version: link:../../packages/pty/pty-local
+      '@deepseek-ai/dsh-pwsh-local':
+        specifier: workspace:^
+        version: link:../../packages/bash/pwsh-local
       '@deepseek-ai/dsh-repeat-tool-guard':
         specifier: workspace:^
         version: link:../../packages/guard/repeat-tool-guard
@@ -416,6 +422,9 @@ importers:
       '@deepseek-ai/dsh-tool-goal':
         specifier: workspace:^
         version: link:../../packages/goal/tool-goal
+      '@deepseek-ai/dsh-tool-pwsh':
+        specifier: workspace:^
+        version: link:../../packages/bash/tool-pwsh
       '@deepseek-ai/dsh-tool-ralph':
         specifier: workspace:^
         version: link:../../packages/workflow/tool-ralph
@@ -565,6 +574,9 @@ importers:
       '@deepseek-ai/dsh-bash':
         specifier: workspace:*
         version: link:../packages/bash/bash
+      '@deepseek-ai/dsh-bash-env':
+        specifier: workspace:*
+        version: link:../packages/bash/bash-env
       '@deepseek-ai/dsh-bash-local':
         specifier: workspace:*
         version: link:../packages/bash/bash-local
@@ -649,6 +661,9 @@ importers:
       '@deepseek-ai/dsh-pty-local':
         specifier: workspace:*
         version: link:../packages/pty/pty-local
+      '@deepseek-ai/dsh-pwsh-local':
+        specifier: workspace:*
+        version: link:../packages/bash/pwsh-local
       '@deepseek-ai/dsh-repeat-tool-guard':
         specifier: workspace:*
         version: link:../packages/guard/repeat-tool-guard
@@ -766,6 +781,9 @@ importers:
       '@deepseek-ai/dsh-tool-pty':
         specifier: workspace:*
         version: link:../packages/pty/tool-pty
+      '@deepseek-ai/dsh-tool-pwsh':
+        specifier: workspace:*
+        version: link:../packages/bash/tool-pwsh
       '@deepseek-ai/dsh-tool-ralph':
         specifier: workspace:*
         version: link:../packages/workflow/tool-ralph
@@ -873,6 +891,37 @@ importers:
         specifier: ^4.0.0-rc.7
         version: link:../../../vendor/cordis
 
+  packages/bash/bash-env:
+    dependencies:
+      schemastery:
+        specifier: ^3.18.0
+        version: link:../../../vendor/schemastery
+    devDependencies:
+      '@deepseek-ai/dsh-agent':
+        specifier: workspace:^
+        version: link:../../core/agent
+      '@deepseek-ai/dsh-bash':
+        specifier: workspace:^
+        version: link:../bash
+      '@deepseek-ai/dsh-invariants':
+        specifier: workspace:^
+        version: link:../../support/invariants
+      '@deepseek-ai/dsh-llm':
+        specifier: workspace:^
+        version: link:../../llm/llm
+      '@deepseek-ai/dsh-paths':
+        specifier: workspace:^
+        version: link:../../util/paths
+      '@deepseek-ai/dsh-session-persistence':
+        specifier: workspace:^
+        version: link:../../session-persistence/session-persistence
+      '@deepseek-ai/dsh-tools':
+        specifier: workspace:^
+        version: link:../../core/tools
+      cordis:
+        specifier: ^4.0.0-rc.7
+        version: link:../../../vendor/cordis
+
   packages/bash/bash-local:
     dependencies:
       schemastery:
@@ -928,6 +977,31 @@ importers:
         specifier: 0.0.0-test.0
         version: 0.0.0-test.0
 
+  packages/bash/pwsh-local:
+    dependencies:
+      schemastery:
+        specifier: ^3.18.0
+        version: link:../../../vendor/schemastery
+    devDependencies:
+      '@deepseek-ai/dsh-bash':
+        specifier: workspace:^
+        version: link:../bash
+      '@deepseek-ai/dsh-invariants':
+        specifier: workspace:^
+        version: link:../../support/invariants
+      '@deepseek-ai/dsh-subprocess':
+        specifier: workspace:^
+        version: link:../../subprocess/subprocess
+      '@deepseek-ai/dsh-subprocess-local':
+        specifier: workspace:^
+        version: link:../../subprocess/subprocess-local
+      '@deepseek-ai/dsh-timeout':
+        specifier: workspace:^
+        version: link:../../util/timeout
+      cordis:
+        specifier: ^4.0.0-rc.7
+        version: link:../../../vendor/cordis
+
   packages/bash/tool-bash:
     dependencies:
       schemastery:
@@ -946,6 +1020,9 @@ importers:
       '@deepseek-ai/dsh-bash':
         specifier: workspace:^
         version: link:../bash
+      '@deepseek-ai/dsh-bash-env':
+        specifier: workspace:^
+        version: link:../bash-env
       '@deepseek-ai/dsh-bash-local':
         specifier: workspace:^
         version: link:../bash-local
@@ -955,9 +1032,6 @@ importers:
       '@deepseek-ai/dsh-llm':
         specifier: workspace:^
         version: link:../../llm/llm
-      '@deepseek-ai/dsh-paths':
-        specifier: workspace:^
-        version: link:../../util/paths
       '@deepseek-ai/dsh-sandbox':
         specifier: workspace:^
         version: link:../../sandbox/sandbox
@@ -967,9 +1041,6 @@ importers:
       '@deepseek-ai/dsh-session':
         specifier: workspace:^
         version: link:../../core/session
-      '@deepseek-ai/dsh-session-persistence':
-        specifier: workspace:^
-        version: link:../../session-persistence/session-persistence
       '@deepseek-ai/dsh-session-persistence-jsonl':
         specifier: workspace:^
         version: link:../../session-persistence/session-persistence-jsonl
@@ -998,6 +1069,55 @@ importers:
         specifier: ^4.0.0-rc.7
         version: link:../../../vendor/cordis
 
+  packages/bash/tool-pwsh:
+    dependencies:
+      schemastery:
+        specifier: ^3.18.0
+        version: link:../../../vendor/schemastery
+    devDependencies:
+      '@deepseek-ai/dsh-agent':
+        specifier: workspace:^
+        version: link:../../core/agent
+      '@deepseek-ai/dsh-bash':
+        specifier: workspace:^
+        version: link:../bash
+      '@deepseek-ai/dsh-bash-env':
+        specifier: workspace:^
+        version: link:../bash-env
+      '@deepseek-ai/dsh-invariants':
+        specifier: workspace:^
+        version: link:../../support/invariants
+      '@deepseek-ai/dsh-llm':
+        specifier: workspace:^
+        version: link:../../llm/llm
+      '@deepseek-ai/dsh-loader-smoke':
+        specifier: workspace:^
+        version: link:../../support/loader-smoke
+      '@deepseek-ai/dsh-pwsh-local':
+        specifier: workspace:^
+        version: link:../pwsh-local
+      '@deepseek-ai/dsh-subprocess-local':
+        specifier: workspace:^
+        version: link:../../subprocess/subprocess-local
+      '@deepseek-ai/dsh-system-prompt':
+        specifier: workspace:^
+        version: link:../../core/system-prompt
+      '@deepseek-ai/dsh-tasks':
+        specifier: workspace:^
+        version: link:../../tasks/tasks
+      '@deepseek-ai/dsh-tasks-local':
+        specifier: workspace:^
+        version: link:../../tasks/tasks-local
+      '@deepseek-ai/dsh-tool-tasks':
+        specifier: workspace:^
+        version: link:../../tasks/tool-tasks
+      '@deepseek-ai/dsh-tools':
+        specifier: workspace:^
+        version: link:../../core/tools
+      cordis:
+        specifier: ^4.0.0-rc.7
+        version: link:../../../vendor/cordis
+
   packages/client/connection:
     dependencies:
       '@deepseek-ai/dsh-commands':
@@ -2692,6 +2812,9 @@ importers:
       '@deepseek-ai/dsh-agent-loop':
         specifier: workspace:^
         version: link:../../core/agent-loop
+      '@deepseek-ai/dsh-bash-env':
+        specifier: workspace:^
+        version: link:../../bash/bash-env
       '@deepseek-ai/dsh-bash-local':
         specifier: workspace:^
         version: link:../../bash/bash-local
@@ -6277,6 +6400,9 @@ importers:
       '@deepseek-ai/dsh-bash':
         specifier: workspace:^
         version: link:../../packages/bash/bash
+      '@deepseek-ai/dsh-bash-env':
+        specifier: workspace:^
+        version: link:../../packages/bash/bash-env
       '@deepseek-ai/dsh-bash-local':
         specifier: workspace:^
         version: link:../../packages/bash/bash-local

python/sdk-runtime/package.json

@@ -14,6 +14,7 @@
     "@deepseek-ai/dsh-agent-spine-demo": "workspace:^",
     "@deepseek-ai/dsh-app-boot": "workspace:^",
     "@deepseek-ai/dsh-bash": "workspace:^",
+    "@deepseek-ai/dsh-bash-env": "workspace:^",
     "@deepseek-ai/dsh-bash-local": "workspace:^",
     "@deepseek-ai/dsh-brand": "workspace:^",
     "@deepseek-ai/dsh-code-runtime": "workspace:^",

scripts/doc-budgets.manifest.json

@@ -4,7 +4,7 @@
   "docs/architecture.md": 2160,
   "docs/cordis-primer.md": 600,
   "docs/defensive-patterns.md": 550,
-  "docs/testing.md": 1100,
+  "docs/testing.md": 1150,
   "examples/AGENTS.md": 310,
   "packages/AGENTS.md": 675,
   "packages/README.md": 920

scripts/gen-doc-graphs.ts

@@ -328,16 +328,17 @@ const SERVICE_ROLES: ServiceRole[] = [
     pkg: 'bash',
     title: 'Bash executor seam',
     mode: 'seam',
-    implementations: ['bash-local', 'bash-sandbox'],
-    consumers: ['tool-bash', 'hooks-claude', 'hooks-codex'],
-    note: 'The model-facing bash tools and hook bridges consume this seam; sandboxed or remote executors replace bash-local without touching them.',
+    implementations: ['bash-local', 'bash-sandbox', 'pwsh-local'],
+    consumers: ['tool-bash', 'tool-pwsh', 'hooks-claude', 'hooks-codex'],
+    note: 'The model-facing shell tools and hook bridges consume this seam; sandboxed, remote, or PowerShell executors replace bash-local without touching them.',
   },
   {
     key: 'bashEnv',
-    pkg: 'tool-bash',
+    pkg: 'bash-env',
     title: 'Managed bash environment registry',
     mode: 'core',
-    note: 'Plugins declare effect-scoped DSH_* facts; tool-bash collects one trusted snapshot per execution and the executor rebuilds the namespace.',
+    consumers: ['tool-bash', 'tool-pwsh'],
+    note: 'Plugins declare effect-scoped DSH_* facts; each shell tool collects one trusted snapshot per execution and its executor rebuilds the namespace.',
   },
   {
     key: 'pty',