Merge remote-tracking branch 'origin/master' into codex/fix-deepseek-keepalive

# Conflicts: # .agents/notes/implemented/architecture/2026-06-21-bounded-llm-request-recovery.i18n.yaml # examples/headless-agent/tests/fixtures/deepseek-defaults.cordis.yml # packages/llm/llm-deepseek/README.i18n.yaml # packages/util/timeout/README.i18n.yaml
2026-08-09 15:00:08 +08:00
parent 168785a99a 8c124f84b6
commit 57c9e077ce
4661 changed files with 164891 additions and 79798 deletions
--- a/examples/README.i18n.yaml
+++ b/examples/README.i18n.yaml
@@ -2,5 +2,5 @@
 # side as of the last confirmed-consistent state. Both languages carry equal authority;
 # after editing either side, bring the other along and re-record with:
 #   pnpm run verify-translation-pairing --write examples/README.md
-README.md: 64e9804eb69367588e926791039c453b0a9aede9
-README.zh.md: dd26b9e3f35c2d3350da77ce04bd77b4660ced1b
+README.md: 5d021d9d9c7abae90b5f96bccd6447f4e2c3dc57
+README.zh.md: 66b355a93c0a0e6b53d1353de4024b7f86e82f7c
--- a/examples/README.md
+++ b/examples/README.md
@@ -2,32 +2,24 @@

 English | [中文](README.zh.md)

-Runnable demos (not workspaces) that showcase how the harness is wired. Each example is a **thin leaf**: either a `cordis.yml` tree that picks swappable backends and loads one app package, or an **overlay** — a patch list `dsh --config` applies over the shipped composition ([`apps/cli/config/base.cordis.yml`](../apps/cli/config/base.cordis.yml) plus a surface overlay). Bundled compositions live in [`@deepseek-ai/dsh-cli-demo`](../packages/examples/cli-demo), [`@deepseek-ai/dsh-acp-demo`](../packages/examples/acp-demo), and their shared [`@deepseek-ai/dsh-agent-spine-demo`](../packages/examples/agent-spine-demo) bundle; the `dsh` surfaces use flat config trees instead. There is no `start.ts`; the terminal `demo:*` scripts boot through the [`dsh`](../apps/cli/README.md) CLI, and the headless/ACP scripts invoke the `cli-demo`/`acp-demo` bins.
+Runnable demonstrations of the main DeepSeek Harness interfaces and extension points. Each child directory owns its configuration, prerequisites, commands, and detailed behavior.

 ## mcp-memory

-Three default-off reference overlays connect a memory MCP server through the generic MCP client. Pick one file and pass it to `dsh --config`; DSH does not install or configure the upstream memory system. See [mcp-memory/README.md](mcp-memory/README.md) for pinned prerequisites, identity mapping, the shared optional prompt, and the write → fresh-session recall → use verification recipe.
+Optional overlays that connect supported third-party memory servers through the generic MCP client. See the [memory example reference](mcp-memory/README.md).

 ## headless-agent

-A non-interactive agent demo that accepts one positional task, runs one complete model/tool turn on the `@deepseek-ai/dsh-cli-demo` app, persists a fresh session, prints `text`, `json`, or `stream-json`, and exits.
-
-Run with: `pnpm run demo:headless "task"` (needs `DEEPSEEK_API_KEY`). See [headless-agent/README.md](headless-agent/README.md) for the output contract, safety boundaries, and snapshot suite.
+A non-interactive agent that accepts one task, runs it, and emits a selected machine-readable or human-readable output format. See the [headless example reference](headless-agent/README.md).

 ## jsonrpc-agent

-An unattended coding agent driven through the Python SDK: JSON-RPC stdio, foreground-only `bash`, `read` / `write` / `edit`, one foreground `subagent`, `todo_write`, JSONL persistence, and compaction. It excludes terminal UI, stdout logging, approvals, skills, and background task controls. See [jsonrpc-agent/README.md](jsonrpc-agent/README.md).
+An unattended coding agent driven through the Python SDK and JSON-RPC. See the [JSON-RPC example reference](jsonrpc-agent/README.md).

 ## web-cordis

-The **self-referential** demo: the coding spine plus [`@deepseek-ai/dsh-tool-cordis`](../packages/cordis/tool-cordis), whose three tools (`cordis_inspect` / `cordis_mount` / `cordis_unmount`) let the agent inspect the current DSH process, mount model-written temporary Plugins (an event listener, a brand-new tool, or a service another temporary Plugin injects), and unmount them again. These Plugins exist only in memory and share one internal `cordis-dynamic` fiber subtree; `ctx.fs`/`ctx.web` ride along provider-only as capabilities they can use.
-
-Run the browser UI at `http://127.0.0.1:3081` with `pnpm run demo:cordis`, or the ACP server with `pnpm run demo:cordis acp` (both need `DEEPSEEK_API_KEY`). See [the toolset Agent Note](../.agents/notes/implemented/feature/2026-07-08-self-referential-cordis-toolset.md) for the design and sandbox caveats.
+A self-referential agent that can inspect and change its in-memory Cordis plugin tree. See the [web-cordis example reference](web-cordis/README.md).

 ## acp-agent

-An agent exposed as an **Agent Client Protocol (ACP)** automation server over JSON-RPC stdio, via [`@deepseek-ai/dsh-acp-demo`](../packages/examples/acp-demo). Programmatic clients create fresh sessions, send text prompts, consume committed assistant text, answer one-shot permission requests, and cancel work. It owns the ACP keyless snapshot suite.
-
-Run with: `pnpm run demo:acp` (needs `DEEPSEEK_API_KEY`); `pnpm run demo:code-mode` boots the same server in Code Mode via the `code-mode.cordis.yml` overlay. See [acp-agent/README.md](acp-agent/README.md) for the protocol and snapshot-test contracts.
-
-The default `cordis.yml` composes [`@deepseek-ai/dsh-sandbox-local`](../packages/sandbox/sandbox-local), [`@deepseek-ai/dsh-bash-sandbox`](../packages/bash/bash-sandbox), and [`@deepseek-ai/dsh-user-approval`](../packages/ui/user-approval). `workspace-write` confines bash and filesystem mutations to each session workspace; a wider retry becomes a one-shot machine permission request over ACP.
+An Agent Client Protocol automation server for programmatic clients, with session, permission, and cancellation support. See the [ACP example reference](acp-agent/README.md).
--- a/examples/README.zh.md
+++ b/examples/README.zh.md
@@ -2,32 +2,24 @@

 [English](README.md) | 中文

-展示 harness 如何接线的可运行演示（不是 workspace）。每个示例都是一个 **轻量叶节点**：要么是一份选择可替换后端、加载一个应用包（package）的 `cordis.yml` 配置树，要么是一个 **overlay**——由 `dsh --config` 叠加到交付组合（[`apps/cli/config/base.cordis.yml`](../apps/cli/config/base.cordis.yml) 加一份 surface overlay）之上的 patch 列表。成组的组合位于 [`@deepseek-ai/dsh-cli-demo`](../packages/examples/cli-demo)、[`@deepseek-ai/dsh-acp-demo`](../packages/examples/acp-demo) 及它们共享的 [`@deepseek-ai/dsh-agent-spine-demo`](../packages/examples/agent-spine-demo) 组合包中；`dsh` 的各 surface 则改用平铺 config tree。没有 `start.ts`；终端 `demo:*` 脚本通过 [`dsh`](../apps/cli/README.md) CLI（命令行界面）启动，无头／ACP（Agent Client Protocol）脚本则调用 `cli-demo`/`acp-demo` bin。
+展示 DeepSeek Harness 主要接口和扩展点的可运行演示。每个子目录负责自己的配置、前置条件、命令和详细行为。

 ## mcp-memory

-三份默认关闭的参考 overlay 通过通用 MCP 客户端连接一个记忆 MCP 服务器。选择其中一份文件传给 `dsh --config`；DSH 不负责安装或配置上游记忆系统。版本固定的前置条件、身份映射、可选的共用提示词，以及「写入 → 新会话召回 → 使用」验证流程详见 [mcp-memory/README.md](mcp-memory/README.md)。
+通过通用 MCP 客户端连接受支持第三方记忆服务器的可选 overlay。详见[记忆示例参考](mcp-memory/README.md)。

 ## headless-agent

-非交互式 agent（智能体）演示：接受一个位置任务，在 `@deepseek-ai/dsh-cli-demo` 应用上运行一个完整模型／工具轮次，持久化新会话，打印 `text`、`json` 或 `stream-json`，然后退出。
-
-运行：`pnpm run demo:headless "task"`（需要 `DEEPSEEK_API_KEY`）。输出契约、安全边界和快照套件详见 [headless-agent/README.md](headless-agent/README.md)。
+非交互式 agent（智能体）：接受一项任务并运行，然后以选定的机器可读或人类可读格式输出结果。详见[无头示例参考](headless-agent/README.md)。

 ## jsonrpc-agent

-通过 Python SDK 驱动的无人值守编码 agent：JSON-RPC stdio、仅前台 `bash`、`read`/`write`/`edit`、一个前台 `subagent`、`todo_write`、JSONL 持久化和压缩。它不包含终端 UI、stdout 日志、批准、skill 和后台任务控制。详见 [jsonrpc-agent/README.md](jsonrpc-agent/README.md)。
+由 Python SDK 和 JSON-RPC 驱动的无人值守编码 agent。详见 [JSON-RPC 示例参考](jsonrpc-agent/README.md)。

 ## web-cordis

-**自指** 演示：编码主干加 [`@deepseek-ai/dsh-tool-cordis`](../packages/cordis/tool-cordis)，其三个工具（`cordis_inspect`/`cordis_mount`/`cordis_unmount`）使 agent 可以检查当前 DSH 进程、挂载模型编写的临时 Plugin（事件监听器、一个全新工具，或一个供另一临时 Plugin 注入的服务），并再次卸载它们。这些 Plugin 只存在于内存中，共享一个内部 `cordis-dynamic` fiber 子树；`ctx.fs`/`ctx.web` 仅作为它们可用的能力提供方。
-
-使用 `pnpm run demo:cordis` 在 `http://127.0.0.1:3081` 启动浏览器 UI，或使用 `pnpm run demo:cordis acp` 启动 ACP 服务器（两者均需 `DEEPSEEK_API_KEY`）。设计与沙箱注意事项详见[工具集 Agent Note](../.agents/notes/implemented/feature/2026-07-08-self-referential-cordis-toolset.md)。
+能够检查并更改内存中 Cordis 插件树的自指 agent。详见 [web-cordis 示例参考](web-cordis/README.md)。

 ## acp-agent

-作为 **Agent Client Protocol (ACP)** 自动化服务器通过 JSON-RPC stdio 公开的 agent，由 [`@deepseek-ai/dsh-acp-demo`](../packages/examples/acp-demo) 提供。程序化客户端可以创建新会话、发送文本提示词、消费已提交的 assistant 文本、回答一次性权限请求并取消工作。它拥有 ACP 无密钥快照套件。
-
-运行：`pnpm run demo:acp`（需要 `DEEPSEEK_API_KEY`）；`pnpm run demo:code-mode` 通过 `code-mode.cordis.yml` 覆盖以 Code Mode 启动同一服务器。协议与快照测试契约详见 [acp-agent/README.md](acp-agent/README.md)。
-
-默认 `cordis.yml` 组合 [`@deepseek-ai/dsh-sandbox-local`](../packages/sandbox/sandbox-local)、[`@deepseek-ai/dsh-bash-sandbox`](../packages/bash/bash-sandbox) 和 [`@deepseek-ai/dsh-user-approval`](../packages/ui/user-approval)。`workspace-write` 将 bash 和文件系统变更限制在每个会话 workspace 中；范围更广的重试会通过 ACP 成为一次性机器权限请求。
+面向程序化客户端的 ACP（Agent Client Protocol）自动化服务器，支持会话、权限和取消操作。详见 [ACP 示例参考](acp-agent/README.md)。
--- a/examples/acp-agent/README.i18n.yaml
+++ b/examples/acp-agent/README.i18n.yaml
@@ -2,5 +2,5 @@
 # side as of the last confirmed-consistent state. Both languages carry equal authority;
 # after editing either side, bring the other along and re-record with:
 #   pnpm run verify-translation-pairing --write examples/acp-agent/README.md
-README.md: a37954d4d52900413a506f227759a0a7dd2a25d0
-README.zh.md: a38431ea2f01fe16ff39b5dd00ec23e881713f5d
+README.md: 61c6efafe9dde4f91385beebdfd426c57006187b
+README.zh.md: bd1b0e2200271a71074fbb2475167c25eb309d77
--- a/examples/acp-agent/README.md
+++ b/examples/acp-agent/README.md
@@ -9,7 +9,7 @@ pnpm run demo:acp             # needs DEEPSEEK_API_KEY (repo-root .env or env)
 pnpm run demo:code-mode       # same protocol with the Code Mode tool transport
 ```

-The leaf loads the ACP app, DeepSeek adapter, sandboxed bash and filesystem stacks, one-shot approval policy, compaction, subagents, workflows, hooks, a derived session-query index, and repeat guard. The app creates one fresh agent per `session/new`, persists sessions to JSONL, and keeps stdout protocol-pure. [`session-query.cordis.yml`](session-query.cordis.yml) explicitly opts into the workspace-authorized query tools and generic timeout/spill policies for their dedicated snapshot; [`fs.cordis.yml`](fs.cordis.yml) adds spill storage for filesystem scenarios, [`code-mode.cordis.yml`](code-mode.cordis.yml) adds `run_code` and its generated TypeScript SDK, and [`web.cordis.yml`](web.cordis.yml) adds the web seam, the local fetch provider, `web_fetch`, and a loopback HTML fixture server for the web-fetch snapshot.
+The leaf loads the ACP app, DeepSeek adapter, sandboxed bash and filesystem stacks, one-shot approval policy, compaction, subagents, workflows, hooks, a derived session-query index, and repeat guard. The app creates one fresh agent per `session/new`, persists sessions to JSONL, and keeps stdout protocol-pure. Optional overlays add session queries, filesystem spill storage, Code Mode, or web fetching.

 ## Protocol channel

@@ -19,12 +19,6 @@ The automation contract — supported methods, baseline prompt content, committe

 ## Session workspaces and permissions

-Each `session/new` supplies an absolute `cwd`. Sandboxed bash and filesystem mutations resolve `workspace-write` against that session cwd, so concurrent sessions can use separate project roots; platform temporary roots remain shared writable scratch space ([sandbox contract](../../packages/sandbox/sandbox/README.md)). `DSH_PERMISSION_MODE` selects `workspace-write` or `danger-full-access` for deployment and tests.
+Each `session/new` supplies an absolute `cwd`. Sandboxed bash and filesystem mutations resolve `workspace-write` against that session cwd, so concurrent sessions can use separate project roots; platform temporary roots remain shared writable scratch space ([sandbox contract](../../packages/sandbox/sandbox/README.md)). `DSH_PERMISSION_MODE` selects `workspace-write` or `danger-full-access` for the deployment.

 Under `workspace-write`, a model retry requesting wider sandbox access triggers `session/request_permission` with `allow_once` and `reject_once`. The client decides programmatically; dismissal or an unavailable answer fails closed. The selected outcome applies only to that retry and is recorded through the normal tool-result/audit path. The server never exposes a permission picker or persists client policy.
-
-## Snapshot tests
-
-This example owns the ACP snapshot suite. It boots the real automation server, replays committed model streams through `dsh-llm-replay`, and compares both normalized protocol output and re-persisted session logs. Recording uses the real model; refresh reuses committed replay input. Overrides cover throw/hang behavior, and optional `workspace/` fixtures seed world-state checks.
-
-Most scenarios pin backend behavior rather than ACP-specific behavior; the [automation-only ACP decision](../../.agents/notes/implemented/simplification/2026-07-23-acp-automation-only-protocol.md#snapshot-boundary) owns why that coverage remains transport-coupled.
--- a/examples/acp-agent/README.zh.md
+++ b/examples/acp-agent/README.zh.md
@@ -2,29 +2,23 @@

 [English](README.md) | 中文

-通过 JSON-RPC stdio 提供的面向自动化的 [Agent Client Protocol（ACP）](https://agentclientprotocol.com) 服务器。它面向 parent agent（父智能体）、subagent 提供方和其他程序化客户端，而非产品 UI。
+通过 JSON-RPC stdio 提供的面向自动化的 [ACP（Agent Client Protocol）](https://agentclientprotocol.com) 服务器。它面向 parent agent（父智能体）、subagent 提供方和其他程序化客户端，而非产品 UI。

 ```sh
 pnpm run demo:acp             # needs DEEPSEEK_API_KEY (repo-root .env or env)
 pnpm run demo:code-mode       # same protocol with the Code Mode tool transport
 ```

-该叶节点加载 ACP 应用、DeepSeek 适配器、受沙箱限制的 bash 与文件系统栈、一次性批准策略、压缩（compaction）、subagent、工作流、钩子、派生会话查询索引和重复守卫。应用为每次 `session/new` 创建一个新 agent，将会话持久化到 JSONL，并保持 stdout 只含协议内容。[`session-query.cordis.yml`](session-query.cordis.yml) 为其专用快照显式选用 workspace 授权的查询工具和通用超时／溢出策略；[`fs.cordis.yml`](fs.cordis.yml) 为文件系统场景添加溢出存储，[`code-mode.cordis.yml`](code-mode.cordis.yml) 添加 `run_code` 及其生成的 TypeScript SDK，[`web.cordis.yml`](web.cordis.yml) 则为 web-fetch 快照添加 web seam、本地抓取提供方、`web_fetch` 与一个回环 HTML fixture（测试前置数据）服务器。
+该叶节点加载 ACP 应用、DeepSeek 适配器、受沙箱限制的 bash 与文件系统栈、一次性批准策略、压缩（compaction）、subagent、工作流、钩子、派生会话查询索引和重复守卫。应用为每次 `session/new` 创建一个新 agent，将会话持久化到 JSONL，并保持 stdout 只含协议内容。可选 overlay 可添加会话查询、文件系统 spill 存储、Code Mode 或 Web 抓取。

 ## 协议通道

 Stdout 只携带以换行分隔的 ACP JSON-RPC。`@deepseek-ai/dsh-acp-demo` 不安装 stdout logger；该叶节点新增的组件必须使用 stderr 输出诊断信息。

-自动化契约（支持的方法、基线提示词内容、已提交文本输出，以及有意缺少的 UI 界面）位于 [`@deepseek-ai/dsh-acp`](../../packages/acp/acp/README.md)。
+自动化约定（支持的方法、基线提示词内容、已提交文本输出，以及有意缺少的 UI 界面）位于 [`@deepseek-ai/dsh-acp`](../../packages/acp/acp/README.md)。

 ## 会话 workspace 与权限

-每次 `session/new` 都提供一个绝对 `cwd`。受沙箱限制的 bash 和文件系统修改会以该会话 cwd 为基准应用 `workspace-write`，因此并发会话可以使用不同的项目根目录；平台临时根目录仍是共享可写暂存空间（参见[沙箱契约](../../packages/sandbox/sandbox/README.md)）。`DSH_PERMISSION_MODE` 在部署和测试中选择 `workspace-write` 或 `danger-full-access`。
+每次 `session/new` 都提供一个绝对 `cwd`。受沙箱限制的 bash 和文件系统修改会以该会话 cwd 为基准应用 `workspace-write`，因此并发会话可以使用不同的项目根目录；平台临时根目录仍是共享可写暂存空间（参见[沙箱约定](../../packages/sandbox/sandbox/README.md)）。`DSH_PERMISSION_MODE` 为部署选择 `workspace-write` 或 `danger-full-access`。

 在 `workspace-write` 下，如果模型重试请求更广泛的沙箱访问权限，就会触发 `session/request_permission`，选项为 `allow_once` 和 `reject_once`。客户端以程序方式决策；客户端放弃选择或无法给出答复时，系统会按拒绝处理。选定结果仅适用于该次重试，并通过常规工具结果／审计路径记录。服务器绝不公开权限选择器，也不持久化客户端策略。
-
-## 快照测试
-
-此示例拥有 ACP 快照套件。它会启动真实自动化服务器，通过 `dsh-llm-replay` 回放已提交的模型流，并比较规范化后的协议输出与重新持久化的会话日志。录制使用真实模型；刷新会复用已提交的回放输入。覆盖配置涵盖抛错／挂起行为，可选的 `workspace/` fixture 则为环境状态检查预置状态。
-
-大多数场景锁定后端行为，而非 ACP 专用行为；[仅面向自动化的 ACP 决策](../../.agents/notes/implemented/simplification/2026-07-23-acp-automation-only-protocol.md#snapshot-boundary)说明了为何该覆盖仍与传输层耦合。
--- a/examples/acp-agent/child-question.cordis.snapshot.yml
+++ b/examples/acp-agent/child-question.cordis.snapshot.yml
@@ -0,0 +1,50 @@
+# Keyless counterpart to child-question.cordis.yml: keep the real interaction
+# seam, model-facing tool, and tripwire provider while replacing DeepSeek with
+# per-session replay.
+- id: base
+  name: '@cordisjs/plugin-include'
+  config:
+    path: ./cordis.yml
+    patches:
+      - id: llm-deepseek
+        name: '@deepseek-ai/dsh-llm-deepseek'
+        disabled: true
+      - id: sandbox
+        name: '@deepseek-ai/dsh-sandbox-local'
+        config:
+          runnerCommand:
+            - bash
+            - -c
+            - while [ "$1" != "--" ]; do shift; done; shift; exec "$@"
+            - passthrough-runner
+          runnerFailureSignatures:
+            - 'passthrough-runner: profile rejected'
+      - id: acp-agent
+        name: '@deepseek-ai/dsh-acp-demo'
+        config:
+          provider: deepseek-official
+          model: deepseek-v4-flash
+          persistenceRoot: !!js process.env.DSH_SNAPSHOT_SESSIONS_ROOT ?? './.sessions'
+          persistenceCompression: none
+          workspaceContext:
+            maxBytes: 65536
+          persona: |
+            You are a coding assistant powered by the {{model}} model. Your working directory is {{cwd}}. Your bash tool runs under a file sandbox — a `[sandbox: file access denied …]` result is policy, not a command bug.
+
+            Verify your work by running the code or tests. Keep answers brief and factual.
+      - insert:
+          - id: llm-replay
+            name: '@deepseek-ai/dsh-llm-replay'
+            config:
+              providers:
+                - id: deepseek-official
+                  name: DeepSeek
+                  models:
+                    - id: deepseek-v4-flash
+                    - id: deepseek-v4-pro
+          - id: user-interaction
+            name: '@deepseek-ai/dsh-user-interaction'
+          - id: tool-ask-user
+            name: '@deepseek-ai/dsh-tool-ask-user'
+          - id: child-question-tripwire
+            name: './tests/fixtures/child-question-tripwire.ts'
--- a/examples/acp-agent/child-question.cordis.yml
+++ b/examples/acp-agent/child-question.cordis.yml
@@ -0,0 +1,14 @@
+# Snapshot-only human-interaction composition. The provider is a tripwire: the
+# runtime-owned child must be rejected by the seam before any UI wait begins.
+- id: base
+  name: '@cordisjs/plugin-include'
+  config:
+    path: ./cordis.yml
+    patches:
+      - insert:
+          - id: user-interaction
+            name: '@deepseek-ai/dsh-user-interaction'
+          - id: tool-ask-user
+            name: '@deepseek-ai/dsh-tool-ask-user'
+          - id: child-question-tripwire
+            name: './tests/fixtures/child-question-tripwire.ts'
--- a/examples/acp-agent/composition.md
+++ b/examples/acp-agent/composition.md
@@ -33,6 +33,8 @@ flowchart LR
  cfg --> plugin_acp_token_meter
  plugin_acp_compact_basic["compact-basic<br/>@deepseek-ai/dsh-compact-basic"]
  cfg --> plugin_acp_compact_basic
+  plugin_acp_session_projection["session-projection<br/>@deepseek-ai/dsh-session-projection"]
+  cfg --> plugin_acp_session_projection
  plugin_acp_subagent["subagent<br/>@deepseek-ai/dsh-subagent"]
  cfg --> plugin_acp_subagent
  plugin_acp_subagent_spawn["subagent-spawn<br/>@deepseek-ai/dsh-subagent-spawn"]
@@ -82,6 +84,7 @@ flowchart LR
 | `acp-agent` | `@deepseek-ai/dsh-acp-demo` |
 | `token-meter` | `@deepseek-ai/dsh-token-meter` |
 | `compact-basic` | `@deepseek-ai/dsh-compact-basic` |
+| `session-projection` | `@deepseek-ai/dsh-session-projection` |
 | `subagent` | `@deepseek-ai/dsh-subagent` |
 | `subagent-spawn` | `@deepseek-ai/dsh-subagent-spawn` |
 | `subagent-fork` | `@deepseek-ai/dsh-subagent-fork` |
--- a/examples/acp-agent/cordis.yml
+++ b/examples/acp-agent/cordis.yml
@@ -9,8 +9,6 @@
 - id: llm-deepseek
  name: '@deepseek-ai/dsh-llm-deepseek'
  config:
-    apiKey: !!js process.env.DEEPSEEK_API_KEY
-    baseURL: !!js process.env.DEEPSEEK_BASE_URL
    thinking: enabled
    reasoningEffort: max
    models:
@@ -80,6 +78,12 @@
    maxTokens: 8192
    compactionRetries: 1

+# Projection registry: subagent catalog identity (mode/label) folds through
+# its registered units; the catalog surfaces (`list_agents`, subagent listing)
+# fail loud without the capability.
+- id: session-projection
+  name: '@deepseek-ai/dsh-session-projection'
+
 # Expose fresh-child `spawn` and completed-prefix `fork` through separate tool
 # names so multi-child scenarios exercise both transports. These leaves follow
 # the app because it provides `ctx.agents` and `ctx.tools`.
@@ -98,8 +102,8 @@

 # Continuable background children are selected per delegation tool. The
 # separately loaded control package registers the global `send_message`; its
-# list plugin registers `list_agents` and requires the app's session query.
-# `report` is installed only in continuable child scopes.
+# list plugin registers `list_agents`, served through the sessionProjections
+# registry mounted above. `report` is installed only in continuable child scopes.
 - id: tool-subagent-control
  name: '@deepseek-ai/dsh-tool-subagent-control'

@@ -141,6 +145,8 @@
 # `todo_write` replaces the logged whole list for later model requests.
 - id: tool-todo
  name: '@deepseek-ai/dsh-tool-todo'
+  config:
+    allowParallelInProgress: true

 # Identical repeat calls trigger advisory context, never a block, at the default
 # thresholds [3, 5, 8]. Only the repeat-tool-guard snapshot scenario reaches them.
--- a/examples/acp-agent/partial-landlock.cordis.snapshot.yml
+++ b/examples/acp-agent/partial-landlock.cordis.snapshot.yml
@@ -0,0 +1,38 @@
+# Keyless runner-classification composition: replay authored model turns and
+# replace the shipping provider with a deterministic process-launch stand-in.
+- id: base
+  name: '@cordisjs/plugin-include'
+  config:
+    path: ./cordis.yml
+    patches:
+      - id: llm-deepseek
+        name: '@deepseek-ai/dsh-llm-deepseek'
+        disabled: true
+      - id: sandbox
+        name: '@deepseek-ai/dsh-sandbox-local'
+        disabled: true
+      - id: acp-agent
+        name: '@deepseek-ai/dsh-acp-demo'
+        config:
+          provider: deepseek-official
+          model: deepseek-v4-flash
+          persistenceRoot: !!js process.env.DSH_SNAPSHOT_SESSIONS_ROOT ?? './.sessions'
+          persistenceCompression: none
+          workspaceContext:
+            maxBytes: 65536
+          persona: |
+            You are a coding assistant powered by the {{model}} model. Your working directory is {{cwd}}. Your bash tool runs under a file sandbox — a `[sandbox: file access denied …]` result is policy, not a command bug.
+
+            Verify your work by running the code or tests. Keep answers brief and factual.
+      - insert:
+          - id: llm-replay
+            name: '@deepseek-ai/dsh-llm-replay'
+            config:
+              providers:
+                - id: deepseek-official
+                  name: DeepSeek
+                  models:
+                    - id: deepseek-v4-flash
+                    - id: deepseek-v4-pro
+          - id: partial-landlock-sandbox
+            name: './tests/fixtures/partial-landlock-sandbox.ts'
--- a/examples/acp-agent/partial-landlock.cordis.yml
+++ b/examples/acp-agent/partial-landlock.cordis.yml
@@ -0,0 +1,13 @@
+# Live counterpart for the runner-classification snapshot overlay. It replaces
+# only the sandbox provider; authored scenarios are skipped in record mode.
+- id: base
+  name: '@cordisjs/plugin-include'
+  config:
+    path: ./cordis.yml
+    patches:
+      - id: sandbox
+        name: '@deepseek-ai/dsh-sandbox-local'
+        disabled: true
+      - insert:
+          - id: partial-landlock-sandbox
+            name: './tests/fixtures/partial-landlock-sandbox.ts'
--- a/examples/acp-agent/retry.cordis.yml
+++ b/examples/acp-agent/retry.cordis.yml
@@ -13,8 +13,6 @@
      - id: llm-deepseek
        name: '@deepseek-ai/dsh-llm-deepseek'
        config:
-          apiKey: !!js process.env.DEEPSEEK_API_KEY
-          baseURL: !!js process.env.DEEPSEEK_BASE_URL
          thinking: enabled
          reasoningEffort: max
          retryPolicy:
--- a/examples/acp-agent/tests/acp.snapshot.ts
+++ b/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'

 /**
@@ -38,6 +40,7 @@ const FS_CONFIG = fileURLToPath(new URL('../fs.cordis.yml', import.meta.url))
 const SESSION_QUERY_CONFIG = fileURLToPath(new URL('../session-query.cordis.yml', import.meta.url))
 const PTY_CONFIG = fileURLToPath(new URL('../pty.cordis.yml', import.meta.url))
 const DEPTH_TWO_CONFIG = fileURLToPath(new URL('../depth-two.cordis.yml', import.meta.url))
+const CHILD_QUESTION_CONFIG = fileURLToPath(new URL('../child-question.cordis.yml', import.meta.url))
 const SESSION_SANDBOX_ROOT_CONFIG = fileURLToPath(new URL('../session-sandbox-root.cordis.yml', import.meta.url))
 const RETRY_CONFIG = fileURLToPath(new URL('../retry.cordis.yml', import.meta.url))
 const SESSION_TITLE_CONFIG = fileURLToPath(new URL('../session-title.cordis.yml', import.meta.url))
@@ -47,6 +50,8 @@ 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 PARTIAL_LANDLOCK_CONFIG = fileURLToPath(new URL('../partial-landlock.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'

@@ -86,8 +91,8 @@ async function prepareFsSearchWorkspace(cwd: string): Promise<void> {
  }
 }

-// FIXME: Migrate backend-oriented scenarios to the headless stream-json suite;
-// this ACP suite should eventually retain only automation-protocol contracts.
+// TODO(acp-snapshot-ownership): Move backend/product scenarios to headless while
+// retaining ACP protocol contracts here.

 function fixtureRecords(name: string): unknown[] {
  return readFileSync(join(SNAPSHOTS_DIR, name, 'session.jsonl'), 'utf8')
@@ -157,6 +162,48 @@ 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,
+  },
+  // Authored keyless replay through a test-only partial-Landlock provider:
+  // the exact compatibility notice must stay ordinary stderr when the wrapped
+  // `false` command exits 1, rather than becoming SANDBOX_UNAVAILABLE.
+  {
+    name: 'partial-landlock-child-failure',
+    hasModelTurn: true,
+    recorded: false,
+    headerClass: 'sandbox',
+    configPath: PARTIAL_LANDLOCK_CONFIG,
+    env: { DSH_PERMISSION_MODE: 'read-only' },
+    posixOnly: true,
+  },
+  // A valid cwd plus a missing provider executable exercises the assembled
+  // foreground error and background task marker without a platform runner.
+  {
+    name: 'missing-sandbox-runner',
+    hasModelTurn: true,
+    recorded: false,
+    headerClass: 'sandbox',
+    configPath: PARTIAL_LANDLOCK_CONFIG,
+    env: {
+      DSH_PERMISSION_MODE: 'read-only',
+      DSH_SNAPSHOT_MISSING_SANDBOX_RUNNER: '1',
+    },
+    posixOnly: true,
+  },
  { name: 'todo-write', hasModelTurn: true, recorded: true },
  {
    name: 'skill-load',
@@ -230,6 +277,8 @@ const SCENARIOS: Scenario[] = [
  // symlinked instruction file to its target's content. A second nested path
  // containing a literal closing tag is created at runtime: Git cannot check
  // that name out on Windows, so this delimiter-injection case is POSIX-only.
+  // The fixture also shadows the baseline after the first touch finishes its
+  // projection; the next entering pre-step restores it before request 2.
  // The scenario-specific config keeps home/root discovery hermetic, and the
  // resulting prefix needs its own pinned header class.
  {
@@ -287,9 +336,10 @@ const SCENARIOS: Scenario[] = [
  },
  // Authored durable-catalog transcript: the snapshot-only lifecycle marker
  // fences the second parent turn behind the child's Activation end, so
-  // `list_agents` deterministically reads the persisted child as complete.
-  // The tool itself executes for real against the control service, session
-  // query, and JSONL persistence; the marker is not model-visible.
+  // `list_agents({ scope: 'descendants' })` deterministically reads the
+  // persisted child as complete, then `interrupt_agent` executes its accepted
+  // no-op against that settled id. Both tools run through the assembled control
+  // service; the marker is not model-visible.
  {
    name: 'subagent-list-agents',
    hasModelTurn: true,
@@ -303,6 +353,19 @@ const SCENARIOS: Scenario[] = [
    overridden: true,
    configPath: DEPTH_TWO_CONFIG,
  },
+  // Authored keyless replay through the assembled app: a one-shot child calls
+  // the real ask_user_question tool, the runtime-ownership guard rejects before
+  // the tripwire provider, and the child carries the unresolved decision in its
+  // final result so the parent can complete instead of waiting forever.
+  {
+    name: 'subagent-child-question-rejection',
+    hasModelTurn: true,
+    recorded: false,
+    pinsHeader: true,
+    headerClass: 'child-question',
+    systemPromptSource: 'text-turn',
+    configPath: CHILD_QUESTION_CONFIG,
+  },
  // The workflow tool: the model writes a one-child orchestration script; the
  // child runs as a spawn subagent under the worker-thread engine (its session is the
  // child fixture), and the tool result carries the script's return value.
@@ -356,12 +419,13 @@ const SCENARIOS: Scenario[] = [
  // tool/code-dispatch events. Each overlay composes and pins its own header class.
  { name: 'code-mode-turn', hasModelTurn: true, recorded: true, pinsHeader: true, headerClass: 'code', configPath: CODE_MODE_CONFIG },
  // A nested fs dispatch inside run_code discovers workspace instructions. The
-  // injected user/message must follow the outer result while retaining workspace
-  // provenance, which proves Code Mode carries deferred tool context end to end.
+  // projection enters the inbox after the outer result and becomes model-visible
+  // on the following step, retaining workspace provenance end to end.
  {
    name: 'code-mode-workspace-context',
    hasModelTurn: true,
-    recorded: true,
+    recorded: false,
+    overridden: true,
    pinsHeader: true,
    headerClass: 'code-workspace-context',
    systemPromptSource: 'code-mode-turn',
@@ -419,11 +483,17 @@ 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', () => {
@@ -438,15 +508,25 @@ it('packed ACP fixture retains every chunk row kind without changing the logical
  expect([...new Set(rowTypes)].sort()).toStrictEqual(['reasoning-chunks', 'text-chunks', 'tool-call-chunks'])
  const withoutMessageId = (record: unknown): unknown => {
    const cloned = structuredClone(record) as {
+      time?: unknown
      type?: unknown
-      data?: { id?: unknown; message?: { id?: unknown } }
+      data?: {
+        durationMs?: unknown
+        id?: unknown
+        inserted?: Array<{ id?: unknown }>
+        message?: { id?: unknown }
+      }
+    }
+    delete cloned.time
+    if (cloned.type === 'agent/inbox/spliced') {
+      for (const message of cloned.data?.inserted ?? []) delete message.id
    }
    if (cloned.type === 'user/message') delete cloned.data?.id
    if (cloned.type === 'assistant/message'
-      || cloned.type === 'tool/result'
-      || cloned.type === 'steering/message') {
+      || cloned.type === 'tool/result') {
      delete cloned.data?.message?.id
    }
+    if (cloned.type === 'hook/result') delete cloned.data?.durationMs
    return cloned
  }
  const logicalRecords = (records: readonly unknown[]): unknown[] => [
--- a/examples/acp-agent/tests/fixtures/bash/tool-pwsh/cordis.yml
+++ b/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'
--- a/examples/acp-agent/tests/fixtures/bash/tool-pwsh/driver.ts
+++ b/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()
+}
--- a/examples/acp-agent/tests/fixtures/child-question-tripwire.ts
+++ b/examples/acp-agent/tests/fixtures/child-question-tripwire.ts
@@ -0,0 +1,17 @@
+import type { Context } from 'cordis'
+import '@deepseek-ai/dsh-user-interaction'
+
+/** Snapshot-only provider whose invocation means the child guard failed. */
+export const name = 'child-question-tripwire'
+
+/** User-interaction service required by the tripwire provider. */
+export const inject = ['userInteraction']
+
+/** Register a provider that must remain unreachable for the delegated call. */
+export function apply(ctx: Context): void {
+  ctx.userInteraction.registerProvider({
+    async ask() {
+      throw new Error('snapshot tripwire: delegated question reached the UI provider')
+    },
+  })
+}
--- a/examples/acp-agent/tests/fixtures/partial-landlock-sandbox.ts
+++ b/examples/acp-agent/tests/fixtures/partial-landlock-sandbox.ts
@@ -0,0 +1,41 @@
+import { join } from 'node:path'
+import type { ConfinedArgv, SandboxPolicy } from '@deepseek-ai/dsh-sandbox'
+import { SandboxProvider } from '@deepseek-ai/dsh-sandbox'
+
+const NOTICE = 'landlock-run: partial enforcement (older Landlock ABI)'
+const MISSING_RUNNER_ENV = 'DSH_SNAPSHOT_MISSING_SANDBOX_RUNNER'
+
+/**
+ * Snapshot-only provider for deterministic runner classification. Its default
+ * launch reproduces older-ABI Landlock; an explicit scenario flag selects a
+ * missing executable under the valid workspace cwd. Keep the Landlock tuple
+ * aligned with `RUNNER_FAILURE_RULES` in `packages/sandbox/sandbox-local/src/index.ts`.
+ */
+export default class PartialLandlockSandboxProvider extends SandboxProvider {
+  confine(argv: readonly string[], policy: SandboxPolicy): ConfinedArgv {
+    if (process.env[MISSING_RUNNER_ENV] === '1') {
+      return {
+        argv: [join(policy.workspaceRoot, '.dsh-missing-sandbox-runner'), ...argv],
+        enforcement: 'full',
+        denialSignatures: ['permission denied'],
+        runnerFailureRules: [{ fatalSignatures: ['snapshot-runner: '] }],
+      }
+    }
+    return {
+      argv: [
+        'bash',
+        '-c',
+        `printf '%s\\n' '${NOTICE}' >&2; exec "$@"`,
+        'partial-landlock-run',
+        ...argv,
+      ],
+      enforcement: 'partial',
+      denialSignatures: ['permission denied'],
+      runnerFailureRules: [{
+        allowedExitCodes: [125],
+        fatalSignatures: ['landlock-run: '],
+        informationalLines: [NOTICE],
+      }],
+    }
+  }
+}
--- a/examples/acp-agent/tests/fixtures/subagent-durability-failure.ts
+++ b/examples/acp-agent/tests/fixtures/subagent-durability-failure.ts
@@ -84,12 +84,16 @@ export function apply(ctx: Context): void {
  // runs, so the queued FIFO order is what the transcript records. The first
  // child enqueue is the initial delegation, which also pins the real child id.
  let accepted = 0
-  ctx.on('agent/inbox/enqueue', (agent) => {
+  ctx.on('agent/inbox/inserted', ({ agent }) => {
    if (agent.session.header.parentSession === undefined) return
    if (realChildId === undefined) realChildId = agent.session.header.id
    accepted += 1
    if (accepted >= 3) followupsAccepted.resolve(undefined)
  })
+  ctx.on('agent/pre-step', async ({ agent }, next) => {
+    if (agent.session.header.parentSession !== undefined) await followupsAccepted.promise
+    return next()
+  })

  // The child's ordinary per-turn flushes succeed; only the final continuation
  // turn's durability checkpoint fails, turning that turn/end into a durable
--- a/examples/acp-agent/tests/fixtures/subagent/subagent-acp/cordis.yml
+++ b/examples/acp-agent/tests/fixtures/subagent/subagent-acp/cordis.yml
@@ -34,12 +34,22 @@
    # budget, so the local numeric default cannot apply here.
    maxDepth: 'provider-managed'

- id: cli-agent
-  name: '@deepseek-ai/dsh-cli-demo'
+- id: agent-spine
+  name: '@deepseek-ai/dsh-agent-spine-demo'
  config:
-    provider: mock
-    model: mock-delegate
+    agents:
+      - id: main
+        provider: mock
+        model: mock-delegate
+        cwd: !!js process.cwd()
    persona: 'Test ACP subagent cwd inheritance.'
-    persistenceRoot: './.sessions'
-    persistenceCompression: 'none'
    workspaceContext: false
+
+- id: persistence
+  name: '@deepseek-ai/dsh-session-persistence-jsonl'
+  config:
+    root: './.sessions'
+    compression: 'none'
+
+- id: checkpoint-policy
+  name: '@deepseek-ai/dsh-session-checkpoint-policy'
--- a/examples/acp-agent/tests/fixtures/subagent/subagent-acp/driver.ts
+++ b/examples/acp-agent/tests/fixtures/subagent/subagent-acp/driver.ts
@@ -2,14 +2,14 @@
 /** Test driver: one delegation turn through a headless Loader composition. */

 import { boot, resolveConfigPath } from '@deepseek-ai/dsh-app-boot'
-import { runOneShot } from '@deepseek-ai/dsh-cli-demo/src/cli.ts'
+import { runFixtureTurn } from '@deepseek-ai/dsh-loader-smoke'

 const configPath = process.argv[2]
 if (configPath === undefined) throw new Error('acp-subagent cwd driver requires a config path')

 const ctx = await boot('acp-subagent-cwd-e2e', resolveConfigPath(configPath, undefined))
 try {
-  await runOneShot(ctx, { task: 'delegate' })
+  await runFixtureTurn(ctx, { task: 'delegate' })
 } finally {
  await ctx.fiber.dispose()
 }
--- a/examples/acp-agent/tests/fixtures/subagent/subagent-claude-code/cordis.yml
+++ b/examples/acp-agent/tests/fixtures/subagent/subagent-claude-code/cordis.yml
@@ -0,0 +1,51 @@
+# Test-only composition of both public opt-in providers and foreground tools.
+# The owning e2e boots this tree but never invokes a model or product process.
+- id: fixture
+  name: './fixture.ts'
+
+- id: subagent
+  name: '@deepseek-ai/dsh-subagent'
+
+- id: subprocess
+  name: '@deepseek-ai/dsh-subprocess-local'
+
+- id: subagent-codex
+  name: '@deepseek-ai/dsh-subagent-codex'
+
+- id: subagent-claude-code
+  name: '@deepseek-ai/dsh-subagent-claude-code'
+
+- id: tool-subagent-codex
+  name: '@deepseek-ai/dsh-tool-subagent'
+  config:
+    provider: codex
+    toolName: subagent_codex
+    enableRunInBackground: false
+    maxDepth: 'provider-managed'
+
+- id: tool-subagent-claude-code
+  name: '@deepseek-ai/dsh-tool-subagent'
+  config:
+    provider: claude-code
+    toolName: subagent_claude_code
+    enableRunInBackground: false
+    maxDepth: 'provider-managed'
+
+- id: agent-spine
+  name: '@deepseek-ai/dsh-agent-spine-demo'
+  config:
+    agents:
+      - id: main
+        provider: mock
+        model: mock-delegate
+        cwd: !!js process.cwd()
+    persona: 'This composition test must not start a model turn.'
+    workspaceContext: false
+
+- id: persistence
+  name: '@deepseek-ai/dsh-session-persistence-jsonl'
+  config:
+    root: './.sessions'
+
+- id: checkpoint-policy
+  name: '@deepseek-ai/dsh-session-checkpoint-policy'
--- a/examples/acp-agent/tests/fixtures/subagent/subagent-claude-code/driver.ts
+++ b/examples/acp-agent/tests/fixtures/subagent/subagent-claude-code/driver.ts
@@ -0,0 +1,65 @@
+#!/usr/bin/env node
+/** Inspect both public product-provider compositions without invoking them. */
+
+import { boot, resolveConfigPath } from '@deepseek-ai/dsh-app-boot'
+import type {} from '@deepseek-ai/dsh-subagent'
+import type {} from '@deepseek-ai/dsh-tools'
+
+const configPath = process.argv[2]
+if (configPath === undefined) {
+  throw new Error('product-provider Loader composition driver requires a config path')
+}
+
+let starts = 0
+const ctx = await boot(
+  'product-provider-loader-composition',
+  resolveConfigPath(configPath, undefined),
+  undefined,
+  (hostCtx) => {
+    hostCtx.on('subagent/start', () => {
+      starts += 1
+    })
+  },
+)
+
+try {
+  const providerNames = ['codex', 'claude-code'] as const
+  const toolNames = ['subagent_codex', 'subagent_claude_code'] as const
+  const providers = providerNames.map((providerName) => {
+    const provider = ctx.subagents.getProvider(providerName)
+    if (provider === undefined) {
+      throw new Error(`${providerName} provider was not registered`)
+    }
+    return {
+      name: provider.name,
+      capabilities: provider.capabilities,
+      inheritsParentContext: provider.inheritsParentContext,
+    }
+  })
+  const tools = toolNames.map((toolName) => {
+    const tool = ctx.tools.schemas().find(schema => schema.name === toolName)
+    if (tool === undefined) throw new Error(`${toolName} tool was not registered`)
+    const properties = tool.parameters.properties
+    if (
+      typeof properties !== 'object'
+      || properties === null
+      || Array.isArray(properties)
+    ) {
+      throw new Error(`${toolName} has invalid parameter properties`)
+    }
+    return {
+      name: tool.name,
+      parameterNames: Object.keys(properties).sort(),
+      required: tool.parameters.required,
+    }
+  })
+
+  process.stdout.write(`${JSON.stringify({
+    registeredProviders: ctx.subagents.list(),
+    providers,
+    tools,
+    starts,
+  })}\n`)
+} finally {
+  await ctx.fiber.dispose()
+}
--- a/examples/acp-agent/tests/fixtures/subagent/subagent-claude-code/fixture.ts
+++ b/examples/acp-agent/tests/fixtures/subagent/subagent-claude-code/fixture.ts
@@ -0,0 +1,7 @@
+/** Reuse the composition-only parent adapter shared by the product providers. */
+
+export {
+  apply,
+  inject,
+  name,
+} from '../subagent-codex/fixture.ts'
--- a/examples/acp-agent/tests/fixtures/subagent/subagent-codex/cordis.yml
+++ b/examples/acp-agent/tests/fixtures/subagent/subagent-codex/cordis.yml
@@ -0,0 +1,40 @@
+# Test-only composition of the public opt-in provider and foreground tool.
+# The owning e2e boots this tree but never invokes the model or Codex.
+- id: fixture
+  name: './fixture.ts'
+
+- id: subagent
+  name: '@deepseek-ai/dsh-subagent'
+
+- id: subprocess
+  name: '@deepseek-ai/dsh-subprocess-local'
+
+- id: subagent-codex
+  name: '@deepseek-ai/dsh-subagent-codex'
+
+- id: tool-subagent-codex
+  name: '@deepseek-ai/dsh-tool-subagent'
+  config:
+    provider: codex
+    toolName: subagent_codex
+    enableRunInBackground: false
+    maxDepth: 'provider-managed'
+
+- id: agent-spine
+  name: '@deepseek-ai/dsh-agent-spine-demo'
+  config:
+    agents:
+      - id: main
+        provider: mock
+        model: mock-delegate
+        cwd: !!js process.cwd()
+    persona: 'This composition test must not start a model turn.'
+    workspaceContext: false
+
+- id: persistence
+  name: '@deepseek-ai/dsh-session-persistence-jsonl'
+  config:
+    root: './.sessions'
+
+- id: checkpoint-policy
+  name: '@deepseek-ai/dsh-session-checkpoint-policy'
--- a/examples/acp-agent/tests/fixtures/subagent/subagent-codex/driver.ts
+++ b/examples/acp-agent/tests/fixtures/subagent/subagent-codex/driver.ts
@@ -0,0 +1,51 @@
+#!/usr/bin/env node
+/** Inspect the public Codex provider composition without invoking the product. */
+
+import { boot, resolveConfigPath } from '@deepseek-ai/dsh-app-boot'
+import type {} from '@deepseek-ai/dsh-subagent'
+import type {} from '@deepseek-ai/dsh-tools'
+
+const configPath = process.argv[2]
+if (configPath === undefined) {
+  throw new Error('subagent-codex Loader composition driver requires a config path')
+}
+
+let starts = 0
+const ctx = await boot(
+  'subagent-codex-loader-composition',
+  resolveConfigPath(configPath, undefined),
+  undefined,
+  (hostCtx) => {
+    hostCtx.on('subagent/start', () => {
+      starts += 1
+    })
+  },
+)
+
+try {
+  const provider = ctx.subagents.getProvider('codex')
+  if (provider === undefined) throw new Error('Codex provider was not registered')
+  const tool = ctx.tools.schemas().find(schema => schema.name === 'subagent_codex')
+  if (tool === undefined) throw new Error('subagent_codex tool was not registered')
+  const properties = tool.parameters.properties
+  if (typeof properties !== 'object' || properties === null || Array.isArray(properties)) {
+    throw new Error('subagent_codex tool has invalid parameter properties')
+  }
+
+  process.stdout.write(`${JSON.stringify({
+    providers: ctx.subagents.list(),
+    provider: {
+      name: provider.name,
+      capabilities: provider.capabilities,
+      inheritsParentContext: provider.inheritsParentContext,
+    },
+    tool: {
+      name: tool.name,
+      parameterNames: Object.keys(properties).sort(),
+      required: tool.parameters.required,
+    },
+    starts,
+  })}\n`)
+} finally {
+  await ctx.fiber.dispose()
+}
--- a/examples/acp-agent/tests/fixtures/subagent/subagent-codex/fixture.ts
+++ b/examples/acp-agent/tests/fixtures/subagent/subagent-codex/fixture.ts
@@ -0,0 +1,22 @@
+/** Parent adapter that fails if the composition-only Loader test starts a turn. */
+
+import type { Context } from 'cordis'
+import type { GenerateOptions, StreamChunk } from '@deepseek-ai/dsh-llm'
+import { LlmAdapter } from '@deepseek-ai/dsh-llm'
+
+class CompositionOnlyAdapter extends LlmAdapter {
+  async * stream(_options: GenerateOptions): AsyncIterable<StreamChunk> {
+    throw new Error('subagent-codex Loader composition must not invoke a model')
+  }
+}
+
+export const name = 'codex-loader-composition-fixture'
+export const inject = ['llm']
+
+/**
+ * Register a parent adapter solely so the host composition is complete.
+ * @param ctx - Loader context supplying the LLM seam.
+ */
+export function apply(ctx: Context): void {
+  ctx.llm.registerAdapter(['mock'], new CompositionOnlyAdapter())
+}
--- a/examples/acp-agent/tests/fixtures/workspace-context-compaction.ts
+++ b/examples/acp-agent/tests/fixtures/workspace-context-compaction.ts
@@ -0,0 +1,36 @@
+import type { Context } from 'cordis'
+import type {} from '@deepseek-ai/dsh-agent'
+import { COMPACT_CHECKPOINT_SOURCE } from '@deepseek-ai/dsh-compact'
+import { createUserMessage } from '@deepseek-ai/dsh-llm'
+import type {} from '@deepseek-ai/dsh-tools'
+
+export const name = 'workspace-context-compaction'
+
+/** Replace the visible workspace baseline after the first touch is fully projected. */
+export function apply(ctx: Context): void {
+  ctx.on('tools/post-execute', async (exec, result, next) => {
+    const downstream = await next()
+    if (result.isError
+      || exec.agent === undefined
+      || exec.name !== 'read'
+      || typeof exec.arguments !== 'object'
+      || exec.arguments === null
+      || !('file_path' in exec.arguments)
+      || exec.arguments.file_path !== 'nested/task.txt') return downstream
+    const agent = exec.agent
+    const baseline = agent.session.surface.nodes
+      .map(seq => agent.session.events[seq])
+      .find(event => event?.type === 'user/message'
+        && event.data.source.kind === 'workspace-instructions'
+        && event.data.source.baseline === true)
+    if (baseline === undefined) throw new Error('workspace baseline missing before snapshot compaction')
+    agent.session.append('user/message', createUserMessage({
+      content: [{ type: 'text', text: 'Earlier context was compacted for this snapshot.' }],
+      source: COMPACT_CHECKPOINT_SOURCE,
+    }), {
+      surfaceOp: { op: 'replace', start: baseline.seq, end: baseline.seq },
+      sourceEventSeqs: [baseline.seq],
+    })
+    return downstream
+  })
+}
--- a/examples/acp-agent/tests/fs-search.cordis.yml
+++ b/examples/acp-agent/tests/fs-search.cordis.yml
@@ -2,8 +2,6 @@
 - 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

--- a/examples/acp-agent/tests/goal-snapshots/goal-session/input.json
+++ b/examples/acp-agent/tests/goal-snapshots/goal-session/input.json
@@ -2,13 +2,10 @@
  "steps": [
    { "op": "initialize" },
    { "op": "newSession" },
-    {
-      "op": "promptAndWaitForAgentMessage",
-      "text": "Create a durable two-round goal for the ACP snapshot, inspect it, then report readiness.",
-      "waitForText": "GOAL ROUND ONE"
-    },
+    { "op": "promptAndWaitForAgentMessage", "text": "Create a durable two-round goal for the ACP snapshot, inspect it, then report readiness.", "waitForText": "GOAL ROUND ONE" },
    { "op": "waitForTurnStart", "minimumTurn": 3 },
    { "op": "cancel", "waitForFile": { "path": ".dsh-snapshot-goal-cancel-ready" } },
-    { "op": "waitForTurnEnd" }
+    { "op": "waitForTurnEnd" },
+    { "op": "waitForEventAfterTurnEnd", "type": "goal/change" }
  ]
 }
--- a/examples/acp-agent/tests/goal-snapshots/goal-session/session.expected.jsonl
+++ b/examples/acp-agent/tests/goal-snapshots/goal-session/session.expected.jsonl
@@ -1,56 +1,62 @@
 {"type":"session","version":0,"id":"{{sessionId}}","createdAt":0,"cwd":"{{cwd}}","delegationDepth":0}
-{"type":"turn/start","seq":0,"time":0,"data":{"turn":1,"trigger":{"kind":"message","source":{"kind":"user"}}}}
-{"type":"user/message","seq":1,"time":0,"data":{"content":[{"type":"text","text":"Create a durable two-round goal for the ACP snapshot, inspect it, then report readiness."}],"source":{"kind":"user"},"role":"user","id":"{{sessionId}}"},"surfaceOp":"append"}
-{"type":"session/title","seq":2,"time":0,"data":{"title":"Create a durable two-round goal","messageSeqs":[1],"source":{"kind":"fallback"}}}
-{"type":"user/message","seq":3,"time":0,"data":{"content":[{"type":"text","text":"Current runtime context. This snapshot supersedes earlier runtime-context snapshots.\n\nCurrent DSH file policy: danger-full-access. The DSH file sandbox does not restrict file modifications by available operations.\n\nApproval prompts are disabled in this session: actions that require approval are rejected automatically — do not request sandbox escalation (do not set `sandbox_permissions`)."}],"source":{"kind":"plugin","plugin":"@deepseek-ai/dsh-system-prompt"},"role":"user","id":"{{sessionId}}"},"surfaceOp":"append"}
-{"type":"step/start","seq":4,"time":0,"data":{"turn":1,"step":1}}
-{"type":"request/header","seq":5,"time":0,"data":{"header":{"config":{"provider":"deepseek-official","model":"deepseek-v4-flash"},"system":"{{system}}","tools":"{{tools}}"},"reason":"initial"}}
-{"type":"request/context","seq":6,"time":0,"data":{"provider":"deepseek-official","model":"deepseek-v4-flash"}}
-{"type":"assistant/chunk","seq":7,"time":0,"data":{"turn":1,"step":1,"chunk":{"type":"block-start","index":0,"blockType":"tool-call"}}}
-{"type":"assistant/chunk","seq":8,"time":0,"data":{"turn":1,"step":1,"chunk":{"type":"tool-call-delta","index":0,"id":"call_goal_create","name":"create_goal","argumentsDelta":"{\"objective\":\"Finish the ACP goal-session snapshot proof\",\"max_goal_rounds\":2}"}}}
-{"type":"assistant/chunk","seq":9,"time":0,"data":{"turn":1,"step":1,"chunk":{"type":"block-end","index":0,"block":{"type":"tool-call","id":"call_goal_create","name":"create_goal","arguments":"{\"objective\":\"Finish the ACP goal-session snapshot proof\",\"max_goal_rounds\":2}"}}}}
-{"type":"assistant/chunk","seq":10,"time":0,"data":{"turn":1,"step":1,"chunk":{"type":"usage","usage":{"inputTokens":20,"outputTokens":8}}}}
-{"type":"assistant/chunk","seq":11,"time":0,"data":{"turn":1,"step":1,"chunk":{"type":"finish","reason":{"kind":"tool-calls"}}}}
-{"type":"assistant/message","seq":12,"time":0,"data":{"turn":1,"step":1,"message":{"role":"assistant","content":[{"type":"tool-call","id":"call_goal_create","name":"create_goal","arguments":"{\"objective\":\"Finish the ACP goal-session snapshot proof\",\"max_goal_rounds\":2}"}],"source":{"kind":"model","provider":"deepseek-official","model":"deepseek-v4-flash"},"id":"{{sessionId}}"},"usage":{"inputTokens":20,"outputTokens":8}},"sourceEventSeqs":[7,8,9,10,11],"surfaceOp":"append"}
-{"type":"tool/call","seq":13,"time":0,"data":{"turn":1,"step":1,"callId":"call_goal_create","name":"create_goal","arguments":"{\"objective\":\"Finish the ACP goal-session snapshot proof\",\"max_goal_rounds\":2}"}}
-{"type":"tool/result","seq":14,"time":0,"data":{"turn":1,"step":1,"message":{"source":{"kind":"tool","callId":"call_goal_create"},"content":[{"type":"tool-result","toolCallId":"call_goal_create","content":[{"type":"text","text":"{\"goal\":{\"id\":\"goal-{{sessionId}}\",\"revision\":1,\"objective\":\"Finish the ACP goal-session snapshot proof\",\"phase\":\"active\",\"roundsStarted\":0,\"maxGoalRounds\":2},\"activation\":\"armed\"}"}],"isError":false}],"role":"user","id":"{{sessionId}}"}},"sourceEventSeqs":[13],"surfaceOp":"append"}
-{"type":"user/message","seq":15,"time":0,"data":{"content":[{"type":"text","text":"<goal_state>{\"goal\":{\"id\":\"goal-{{sessionId}}\",\"revision\":1,\"objective\":\"Finish the ACP goal-session snapshot proof\",\"phase\":\"active\",\"maxGoalRounds\":2},\"roundsStarted\":0,\"createdAt\":0,\"updatedAt\":0}</goal_state>"}],"source":{"kind":"goal","goalId":"goal-{{sessionId}}","revision":1,"round":0,"change":{"kind":"goal/change","version":1,"operation":"create","goal":{"id":"goal-{{sessionId}}","revision":1,"objective":"Finish the ACP goal-session snapshot proof","phase":"active","maxGoalRounds":2},"roundsStarted":0,"createdAt":0,"updatedAt":0}},"role":"user","id":"{{sessionId}}"},"surfaceOp":"append"}
-{"type":"step/end","seq":16,"time":0,"data":{"turn":1,"step":1}}
-{"type":"step/start","seq":17,"time":0,"data":{"turn":1,"step":2}}
-{"type":"assistant/chunk","seq":18,"time":0,"data":{"turn":1,"step":2,"chunk":{"type":"block-start","index":0,"blockType":"tool-call"}}}
-{"type":"assistant/chunk","seq":19,"time":0,"data":{"turn":1,"step":2,"chunk":{"type":"tool-call-delta","index":0,"id":"call_goal_get","name":"get_goal","argumentsDelta":"{}"}}}
-{"type":"assistant/chunk","seq":20,"time":0,"data":{"turn":1,"step":2,"chunk":{"type":"block-end","index":0,"block":{"type":"tool-call","id":"call_goal_get","name":"get_goal","arguments":"{}"}}}}
-{"type":"assistant/chunk","seq":21,"time":0,"data":{"turn":1,"step":2,"chunk":{"type":"usage","usage":{"inputTokens":30,"outputTokens":4}}}}
-{"type":"assistant/chunk","seq":22,"time":0,"data":{"turn":1,"step":2,"chunk":{"type":"finish","reason":{"kind":"tool-calls"}}}}
-{"type":"assistant/message","seq":23,"time":0,"data":{"turn":1,"step":2,"message":{"role":"assistant","content":[{"type":"tool-call","id":"call_goal_get","name":"get_goal","arguments":"{}"}],"source":{"kind":"model","provider":"deepseek-official","model":"deepseek-v4-flash"},"id":"{{sessionId}}"},"usage":{"inputTokens":30,"outputTokens":4}},"sourceEventSeqs":[18,19,20,21,22],"surfaceOp":"append"}
-{"type":"tool/call","seq":24,"time":0,"data":{"turn":1,"step":2,"callId":"call_goal_get","name":"get_goal","arguments":"{}"}}
-{"type":"tool/result","seq":25,"time":0,"data":{"turn":1,"step":2,"message":{"source":{"kind":"tool","callId":"call_goal_get"},"content":[{"type":"tool-result","toolCallId":"call_goal_get","content":[{"type":"text","text":"{\"goal\":{\"id\":\"goal-{{sessionId}}\",\"revision\":1,\"objective\":\"Finish the ACP goal-session snapshot proof\",\"phase\":\"active\",\"roundsStarted\":0,\"maxGoalRounds\":2},\"activation\":\"armed\"}"}],"isError":false}],"role":"user","id":"{{sessionId}}"}},"sourceEventSeqs":[24],"surfaceOp":"append"}
-{"type":"step/end","seq":26,"time":0,"data":{"turn":1,"step":2}}
-{"type":"step/start","seq":27,"time":0,"data":{"turn":1,"step":3}}
-{"type":"assistant/chunk","seq":28,"time":0,"data":{"turn":1,"step":3,"chunk":{"type":"block-start","index":0,"blockType":"text"}}}
-{"type":"assistant/chunk","seq":29,"time":0,"data":{"turn":1,"step":3,"chunk":{"type":"text-delta","index":0,"text":"GOAL READY"}}}
-{"type":"assistant/chunk","seq":30,"time":0,"data":{"turn":1,"step":3,"chunk":{"type":"block-end","index":0,"block":{"type":"text","text":"GOAL READY"}}}}
-{"type":"assistant/chunk","seq":31,"time":0,"data":{"turn":1,"step":3,"chunk":{"type":"usage","usage":{"inputTokens":35,"outputTokens":2}}}}
-{"type":"assistant/chunk","seq":32,"time":0,"data":{"turn":1,"step":3,"chunk":{"type":"finish","reason":{"kind":"stop"}}}}
-{"type":"assistant/message","seq":33,"time":0,"data":{"turn":1,"step":3,"message":{"role":"assistant","content":[{"type":"text","text":"GOAL READY"}],"source":{"kind":"model","provider":"deepseek-official","model":"deepseek-v4-flash"},"id":"{{sessionId}}"},"usage":{"inputTokens":35,"outputTokens":2}},"sourceEventSeqs":[28,29,30,31,32],"surfaceOp":"append"}
-{"type":"step/end","seq":34,"time":0,"data":{"turn":1,"step":3}}
-{"type":"turn/end","seq":35,"time":0,"data":{"turn":1,"reason":{"kind":"completed"}}}
-{"type":"turn/start","seq":36,"time":0,"data":{"turn":2,"trigger":{"kind":"message","source":{"kind":"goal","goalId":"goal-{{sessionId}}","revision":1,"round":1}}}}
-{"type":"user/message","seq":37,"time":0,"data":{"content":[{"type":"text","text":"<goal_round>\nObjective: \"Finish the ACP goal-session snapshot proof\"\nRound: 1/2\n\nContinue working toward the objective in this same session. Treat the current workspace, tool results, and durable session state as authoritative; inspect them instead of assuming earlier narration is still current. Make concrete progress and verify the result. Before claiming completion, gather evidence that the whole objective is achieved, read the current goal, and mark it complete. If work remains, leave the goal active for the next round. Follow the configured goal-tool policy before reporting a blocker.\n</goal_round>"}],"source":{"kind":"goal","goalId":"goal-{{sessionId}}","revision":1,"round":1},"role":"user","id":"{{sessionId}}"},"surfaceOp":"append"}
-{"type":"step/start","seq":38,"time":0,"data":{"turn":2,"step":1}}
-{"type":"assistant/chunk","seq":39,"time":0,"data":{"turn":2,"step":1,"chunk":{"type":"block-start","index":0,"blockType":"text"}}}
-{"type":"assistant/chunk","seq":40,"time":0,"data":{"turn":2,"step":1,"chunk":{"type":"text-delta","index":0,"text":"GOAL ROUND ONE"}}}
-{"type":"assistant/chunk","seq":41,"time":0,"data":{"turn":2,"step":1,"chunk":{"type":"block-end","index":0,"block":{"type":"text","text":"GOAL ROUND ONE"}}}}
-{"type":"assistant/chunk","seq":42,"time":0,"data":{"turn":2,"step":1,"chunk":{"type":"usage","usage":{"inputTokens":40,"outputTokens":3}}}}
-{"type":"assistant/chunk","seq":43,"time":0,"data":{"turn":2,"step":1,"chunk":{"type":"finish","reason":{"kind":"stop"}}}}
-{"type":"assistant/message","seq":44,"time":0,"data":{"turn":2,"step":1,"message":{"role":"assistant","content":[{"type":"text","text":"GOAL ROUND ONE"}],"source":{"kind":"model","provider":"deepseek-official","model":"deepseek-v4-flash"},"id":"{{sessionId}}"},"usage":{"inputTokens":40,"outputTokens":3}},"sourceEventSeqs":[39,40,41,42,43],"surfaceOp":"append"}
-{"type":"step/end","seq":45,"time":0,"data":{"turn":2,"step":1}}
-{"type":"turn/end","seq":46,"time":0,"data":{"turn":2,"reason":{"kind":"completed"}}}
-{"type":"turn/start","seq":47,"time":0,"data":{"turn":3,"trigger":{"kind":"message","source":{"kind":"goal","goalId":"goal-{{sessionId}}","revision":1,"round":2}}}}
-{"type":"user/message","seq":48,"time":0,"data":{"content":[{"type":"text","text":"<goal_round>\nObjective: \"Finish the ACP goal-session snapshot proof\"\nRound: 2/2\n\nContinue working toward the objective in this same session. Treat the current workspace, tool results, and durable session state as authoritative; inspect them instead of assuming earlier narration is still current. Make concrete progress and verify the result. Before claiming completion, gather evidence that the whole objective is achieved, read the current goal, and mark it complete. If work remains, leave the goal active for the next round. Follow the configured goal-tool policy before reporting a blocker.\n</goal_round>"}],"source":{"kind":"goal","goalId":"goal-{{sessionId}}","revision":1,"round":2},"role":"user","id":"{{sessionId}}"},"surfaceOp":"append"}
-{"type":"step/start","seq":49,"time":0,"data":{"turn":3,"step":1}}
-{"type":"assistant/chunk","seq":50,"time":0,"data":{"turn":3,"step":1,"chunk":{"type":"block-start","index":0,"blockType":"text"}}}
-{"type":"assistant/chunk","seq":51,"time":0,"data":{"turn":3,"step":1,"chunk":{"type":"text-delta","index":0,"text":"partial"}}}
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-{"type":"assistant/chunk","seq":42,"time":0,"data":{"turn":2,"step":2,"chunk":{"type":"text-delta","index":0,"text":"GOAL WRAP-UP: the snapshot objective is achieved and this closing message reaches the user."}}}
-{"type":"assistant/chunk","seq":43,"time":0,"data":{"turn":2,"step":2,"chunk":{"type":"block-end","index":0,"block":{"type":"text","text":"GOAL WRAP-UP: the snapshot objective is achieved and this closing message reaches the user."}}}}
-{"type":"assistant/chunk","seq":44,"time":0,"data":{"turn":2,"step":2,"chunk":{"type":"usage","usage":{"inputTokens":52,"outputTokens":14}}}}
-{"type":"assistant/chunk","seq":45,"time":0,"data":{"turn":2,"step":2,"chunk":{"type":"finish","reason":{"kind":"stop"}}}}
-{"type":"assistant/message","seq":46,"time":0,"data":{"turn":2,"step":2,"message":{"role":"assistant","content":[{"type":"text","text":"GOAL WRAP-UP: the snapshot objective is achieved and this closing message reaches the user."}],"source":{"kind":"model","provider":"deepseek-official","model":"deepseek-v4-flash"},"id":"{{sessionId}}"},"usage":{"inputTokens":52,"outputTokens":14}},"sourceEventSeqs":[41,42,43,44,45],"surfaceOp":"append"}
-{"type":"step/end","seq":47,"time":0,"data":{"turn":2,"step":2}}
-{"type":"turn/end","seq":48,"time":0,"data":{"turn":2,"reason":{"kind":"completed"}}}
+{"type":"agent/inbox/spliced","seq":0,"time":0,"data":{"target":"next-turn","start":0,"inserted":[{"content":[{"type":"text","text":"Create a durable goal for the wrap-up snapshot, then report readiness."}],"source":{"kind":"user"},"role":"user","id":"{{sessionId}}"}]}}
+{"type":"turn/start","seq":1,"time":0,"data":{"turn":1}}
+{"type":"agent/inbox/spliced","seq":2,"time":0,"data":{"target":"next-turn","start":0,"removedCount":1,"inserted":[]}}
+{"type":"step/start","seq":3,"time":0,"data":{"turn":1,"step":1}}
+{"type":"user/message","seq":4,"time":0,"data":{"content":[{"type":"text","text":"Create a durable goal for the wrap-up snapshot, then report readiness."}],"source":{"kind":"user"},"role":"user","id":"{{sessionId}}"},"surfaceOp":"append"}
+{"type":"user/message","seq":5,"time":0,"data":{"content":[{"type":"text","text":"Current runtime context. This snapshot supersedes earlier runtime-context snapshots.\n\nCurrent DSH file policy: danger-full-access. The DSH file sandbox does not restrict file modifications by available operations.\n\nApproval prompts are disabled in this session: actions that require approval are rejected automatically — do not request sandbox escalation (do not set `sandbox_permissions`)."}],"source":{"kind":"plugin","plugin":"@deepseek-ai/dsh-system-prompt","form":"snapshot","sections":[{"name":"sandbox:policy","text":"Current DSH file policy: danger-full-access. The DSH file sandbox does not restrict file modifications by available operations."},{"name":"approval:policy","text":"Approval prompts are disabled in this session: actions that require approval are rejected automatically — do not request sandbox escalation (do not set `sandbox_permissions`)."}]},"role":"user","id":"{{sessionId}}"},"surfaceOp":"append"}
+{"type":"session/title","seq":6,"time":0,"data":{"title":"Create a durable goal for","messageSeqs":[4],"source":{"kind":"fallback"}}}
+{"type":"request/header","seq":7,"time":0,"data":{"header":{"config":{"provider":"deepseek-official","model":"deepseek-v4-flash"},"system":"{{system}}","tools":"{{tools}}"},"reason":"initial"}}
+{"type":"request/context","seq":8,"time":0,"data":{"provider":"deepseek-official","model":"deepseek-v4-flash"}}
+{"type":"assistant/chunk","seq":9,"time":0,"data":{"turn":1,"step":1,"chunk":{"type":"block-start","index":0,"blockType":"tool-call"}}}
+{"type":"assistant/chunk","seq":10,"time":0,"data":{"turn":1,"step":1,"chunk":{"type":"tool-call-delta","index":0,"id":"call_goal_create","name":"create_goal","argumentsDelta":"{\"objective\":\"Finish the ACP goal wrap-up snapshot proof\",\"max_goal_rounds\":2}"}}}
+{"type":"assistant/chunk","seq":11,"time":0,"data":{"turn":1,"step":1,"chunk":{"type":"block-end","index":0,"block":{"type":"tool-call","id":"call_goal_create","name":"create_goal","arguments":"{\"objective\":\"Finish the ACP goal wrap-up snapshot proof\",\"max_goal_rounds\":2}"}}}}
+{"type":"assistant/chunk","seq":12,"time":0,"data":{"turn":1,"step":1,"chunk":{"type":"usage","usage":{"inputTokens":20,"outputTokens":8}}}}
+{"type":"assistant/chunk","seq":13,"time":0,"data":{"turn":1,"step":1,"chunk":{"type":"finish","reason":{"kind":"tool-calls"}}}}
+{"type":"assistant/message","seq":14,"time":0,"data":{"turn":1,"step":1,"message":{"role":"assistant","content":[{"type":"tool-call","id":"call_goal_create","name":"create_goal","arguments":"{\"objective\":\"Finish the ACP goal wrap-up snapshot proof\",\"max_goal_rounds\":2}"}],"source":{"kind":"model","provider":"deepseek-official","model":"deepseek-v4-flash"},"id":"{{sessionId}}"},"usage":{"inputTokens":20,"outputTokens":8}},"sourceEventSeqs":[9,10,11,12,13],"surfaceOp":"append"}
+{"type":"tool/call","seq":15,"time":0,"data":{"turn":1,"step":1,"callId":"call_goal_create","name":"create_goal","arguments":"{\"objective\":\"Finish the ACP goal wrap-up snapshot proof\",\"max_goal_rounds\":2}"}}
+{"type":"goal/change","seq":16,"time":0,"data":{"kind":"goal/change","version":1,"operation":"create","goal":{"id":"goal-{{sessionId}}","revision":1,"objective":"Finish the ACP goal wrap-up snapshot proof","phase":"active","maxGoalRounds":2},"roundsStarted":0,"createdAt":0,"updatedAt":0}}
+{"type":"tool/result","seq":17,"time":0,"data":{"turn":1,"step":1,"message":{"source":{"kind":"tool","callId":"call_goal_create"},"content":[{"type":"tool-result","toolCallId":"call_goal_create","content":[{"type":"text","text":"{\"goal\":{\"id\":\"goal-{{sessionId}}\",\"revision\":1,\"objective\":\"Finish the ACP goal wrap-up snapshot proof\",\"phase\":\"active\",\"roundsStarted\":0,\"maxGoalRounds\":2},\"activation\":\"armed\"}"}],"isError":false}],"role":"user","id":"{{sessionId}}"}},"sourceEventSeqs":[15],"surfaceOp":"append"}
+{"type":"step/end","seq":18,"time":0,"data":{"turn":1,"step":1}}
+{"type":"step/start","seq":19,"time":0,"data":{"turn":1,"step":2}}
+{"type":"assistant/chunk","seq":20,"time":0,"data":{"turn":1,"step":2,"chunk":{"type":"block-start","index":0,"blockType":"text"}}}
+{"type":"assistant/chunk","seq":21,"time":0,"data":{"turn":1,"step":2,"chunk":{"type":"text-delta","index":0,"text":"GOAL READY"}}}
+{"type":"assistant/chunk","seq":22,"time":0,"data":{"turn":1,"step":2,"chunk":{"type":"block-end","index":0,"block":{"type":"text","text":"GOAL READY"}}}}
+{"type":"assistant/chunk","seq":23,"time":0,"data":{"turn":1,"step":2,"chunk":{"type":"usage","usage":{"inputTokens":28,"outputTokens":2}}}}
+{"type":"assistant/chunk","seq":24,"time":0,"data":{"turn":1,"step":2,"chunk":{"type":"finish","reason":{"kind":"stop"}}}}
+{"type":"assistant/message","seq":25,"time":0,"data":{"turn":1,"step":2,"message":{"role":"assistant","content":[{"type":"text","text":"GOAL READY"}],"source":{"kind":"model","provider":"deepseek-official","model":"deepseek-v4-flash"},"id":"{{sessionId}}"},"usage":{"inputTokens":28,"outputTokens":2}},"sourceEventSeqs":[20,21,22,23,24],"surfaceOp":"append"}
+{"type":"step/end","seq":26,"time":0,"data":{"turn":1,"step":2}}
+{"type":"turn/end","seq":27,"time":0,"data":{"turn":1,"reason":{"kind":"completed"}}}
+{"type":"agent/inbox/spliced","seq":28,"time":0,"data":{"target":"next-turn","start":0,"inserted":[{"content":[{"type":"text","text":"<goal_round>\nObjective: \"Finish the ACP goal wrap-up snapshot proof\"\nRound: 1/2\n\nContinue working toward the objective in this same session. Treat the current workspace, tool results, and durable session state as authoritative; inspect them instead of assuming earlier narration is still current. Make concrete progress and verify the result. Before claiming completion, gather evidence that the whole objective is achieved, read the current goal, and mark it complete. If work remains, leave the goal active for the next round. Follow the configured goal-tool policy before reporting a blocker.\n</goal_round>"}],"source":{"kind":"goal","goalId":"goal-{{sessionId}}","revision":1,"round":1},"role":"user","id":"{{sessionId}}"}]}}
+{"type":"turn/start","seq":29,"time":0,"data":{"turn":2}}
+{"type":"agent/inbox/spliced","seq":30,"time":0,"data":{"target":"next-turn","start":0,"removedCount":1,"inserted":[]}}
+{"type":"step/start","seq":31,"time":0,"data":{"turn":2,"step":1}}
+{"type":"user/message","seq":32,"time":0,"data":{"content":[{"type":"text","text":"<goal_round>\nObjective: \"Finish the ACP goal wrap-up snapshot proof\"\nRound: 1/2\n\nContinue working toward the objective in this same session. Treat the current workspace, tool results, and durable session state as authoritative; inspect them instead of assuming earlier narration is still current. Make concrete progress and verify the result. Before claiming completion, gather evidence that the whole objective is achieved, read the current goal, and mark it complete. If work remains, leave the goal active for the next round. Follow the configured goal-tool policy before reporting a blocker.\n</goal_round>"}],"source":{"kind":"goal","goalId":"goal-{{sessionId}}","revision":1,"round":1},"role":"user","id":"{{sessionId}}"},"surfaceOp":"append"}
+{"type":"assistant/chunk","seq":33,"time":0,"data":{"turn":2,"step":1,"chunk":{"type":"block-start","index":0,"blockType":"tool-call"}}}
+{"type":"assistant/chunk","seq":34,"time":0,"data":{"turn":2,"step":1,"chunk":{"type":"tool-call-delta","index":0,"id":"call_goal_complete","name":"update_goal","argumentsDelta":"{\"goal_id\":\"goal-{{sessionId}}\",\"revision\":1,\"action\":\"complete\"}"}}}
+{"type":"assistant/chunk","seq":35,"time":0,"data":{"turn":2,"step":1,"chunk":{"type":"block-end","index":0,"block":{"type":"tool-call","id":"call_goal_complete","name":"update_goal","arguments":"{\"goal_id\":\"goal-{{sessionId}}\",\"revision\":1,\"action\":\"complete\"}"}}}}
+{"type":"assistant/chunk","seq":36,"time":0,"data":{"turn":2,"step":1,"chunk":{"type":"usage","usage":{"inputTokens":40,"outputTokens":9}}}}
+{"type":"assistant/chunk","seq":37,"time":0,"data":{"turn":2,"step":1,"chunk":{"type":"finish","reason":{"kind":"tool-calls"}}}}
+{"type":"assistant/message","seq":38,"time":0,"data":{"turn":2,"step":1,"message":{"role":"assistant","content":[{"type":"tool-call","id":"call_goal_complete","name":"update_goal","arguments":"{\"goal_id\":\"goal-{{sessionId}}\",\"revision\":1,\"action\":\"complete\"}"}],"source":{"kind":"model","provider":"deepseek-official","model":"deepseek-v4-flash"},"id":"{{sessionId}}"},"usage":{"inputTokens":40,"outputTokens":9}},"sourceEventSeqs":[33,34,35,36,37],"surfaceOp":"append"}
+{"type":"tool/call","seq":39,"time":0,"data":{"turn":2,"step":1,"callId":"call_goal_complete","name":"update_goal","arguments":"{\"goal_id\":\"goal-{{sessionId}}\",\"revision\":1,\"action\":\"complete\"}"}}
+{"type":"goal/change","seq":40,"time":0,"data":{"kind":"goal/change","version":1,"operation":"complete","goal":{"id":"goal-{{sessionId}}","revision":2,"objective":"Finish the ACP goal wrap-up snapshot proof","phase":"complete","maxGoalRounds":2},"roundsStarted":1,"createdAt":0,"updatedAt":0}}
+{"type":"tool/result","seq":41,"time":0,"data":{"turn":2,"step":1,"message":{"source":{"kind":"tool","callId":"call_goal_complete"},"content":[{"type":"tool-result","toolCallId":"call_goal_complete","content":[{"type":"text","text":"{\"goal\":{\"id\":\"goal-{{sessionId}}\",\"revision\":2,\"objective\":\"Finish the ACP goal wrap-up snapshot proof\",\"phase\":\"complete\",\"roundsStarted\":1,\"maxGoalRounds\":2},\"activation\":\"disarmed\"}"}],"isError":false}],"role":"user","id":"{{sessionId}}"}},"sourceEventSeqs":[39],"surfaceOp":"append"}
+{"type":"agent/inbox/spliced","seq":42,"time":0,"data":{"target":"next-step","start":0,"inserted":[{"content":[{"type":"text","text":"<goal_complete>\nObjective: \"Finish the ACP goal wrap-up snapshot proof\"\nThe goal is marked complete and this autonomous run is ending. Write the closing message to the user now: state the outcome, summarize what was done and how it was verified, and point to the concrete results (files, commits, or other artifacts). Report only what earlier rounds and tool results in this session actually establish; when a detail is not in the session, say so instead of inventing it. Note anything the user should review or do next. Address the user directly. Do not call any more tools in this run; further work waits for the user's next instruction.\n</goal_complete>"}],"source":{"kind":"plugin","plugin":"tool-goal","form":"notice","summary":"complete: Finish the ACP goal wrap-up snapshot proof"},"role":"user","id":"{{sessionId}}"}]}}
+{"type":"step/end","seq":43,"time":0,"data":{"turn":2,"step":1}}
+{"type":"agent/inbox/spliced","seq":44,"time":0,"data":{"target":"next-step","start":0,"removedCount":1,"inserted":[]}}
+{"type":"step/start","seq":45,"time":0,"data":{"turn":2,"step":2}}
+{"type":"user/message","seq":46,"time":0,"data":{"content":[{"type":"text","text":"<goal_complete>\nObjective: \"Finish the ACP goal wrap-up snapshot proof\"\nThe goal is marked complete and this autonomous run is ending. Write the closing message to the user now: state the outcome, summarize what was done and how it was verified, and point to the concrete results (files, commits, or other artifacts). Report only what earlier rounds and tool results in this session actually establish; when a detail is not in the session, say so instead of inventing it. Note anything the user should review or do next. Address the user directly. Do not call any more tools in this run; further work waits for the user's next instruction.\n</goal_complete>"}],"source":{"kind":"plugin","plugin":"tool-goal","form":"notice","summary":"complete: Finish the ACP goal wrap-up snapshot proof"},"role":"user","id":"{{sessionId}}"},"surfaceOp":"append"}
+{"type":"assistant/chunk","seq":47,"time":0,"data":{"turn":2,"step":2,"chunk":{"type":"block-start","index":0,"blockType":"text"}}}
+{"type":"assistant/chunk","seq":48,"time":0,"data":{"turn":2,"step":2,"chunk":{"type":"text-delta","index":0,"text":"GOAL WRAP-UP: the snapshot objective is achieved and this closing message reaches the user."}}}
+{"type":"assistant/chunk","seq":49,"time":0,"data":{"turn":2,"step":2,"chunk":{"type":"block-end","index":0,"block":{"type":"text","text":"GOAL WRAP-UP: the snapshot objective is achieved and this closing message reaches the user."}}}}
+{"type":"assistant/chunk","seq":50,"time":0,"data":{"turn":2,"step":2,"chunk":{"type":"usage","usage":{"inputTokens":52,"outputTokens":14}}}}
+{"type":"assistant/chunk","seq":51,"time":0,"data":{"turn":2,"step":2,"chunk":{"type":"finish","reason":{"kind":"stop"}}}}
+{"type":"assistant/message","seq":52,"time":0,"data":{"turn":2,"step":2,"message":{"role":"assistant","content":[{"type":"text","text":"GOAL WRAP-UP: the snapshot objective is achieved and this closing message reaches the user."}],"source":{"kind":"model","provider":"deepseek-official","model":"deepseek-v4-flash"},"id":"{{sessionId}}"},"usage":{"inputTokens":52,"outputTokens":14}},"sourceEventSeqs":[47,48,49,50,51],"surfaceOp":"append"}
+{"type":"step/end","seq":53,"time":0,"data":{"turn":2,"step":2}}
+{"type":"turn/end","seq":54,"time":0,"data":{"turn":2,"reason":{"kind":"completed"}}}
--- a/examples/acp-agent/tests/goal.snapshot.ts
+++ b/examples/acp-agent/tests/goal.snapshot.ts
@@ -152,7 +152,8 @@ describe('same-session goal snapshot through the ACP automation driver', () => {
      .filter(block => block.type === 'text' && block.text.startsWith('GOAL WRAP-UP'))
    expect(closing).toHaveLength(1)
    const roundTurnEnds = events.filter(event => event.type === 'turn/end' && event.data.turn === 2)
-    expect(roundTurnEnds).toEqual([expect.objectContaining({ data: { turn: 2, reason: { kind: 'completed' } } })])
+    expect(roundTurnEnds).toHaveLength(1)
+    expect(roundTurnEnds[0]?.data).toMatchObject({ turn: 2, reason: { kind: 'completed' } })

    const context: NormalizeContext = {
      sessionIds: [result.sessionId, log.id].filter((id): id is string => id !== undefined),
--- a/examples/acp-agent/tests/pwsh.cordis.snapshot.yml
+++ b/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'
--- a/examples/acp-agent/tests/pwsh.cordis.yml
+++ b/examples/acp-agent/tests/pwsh.cordis.yml
@@ -0,0 +1,35 @@
+# Minimal live counterpart for the pwsh-tool-turn snapshot composition.
+- id: llm-deepseek
+  name: '@deepseek-ai/dsh-llm-deepseek'
+  config:
+    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'
--- a/examples/acp-agent/tests/snapshots/advanced-toolchain/session.1.jsonl
+++ b/examples/acp-agent/tests/snapshots/advanced-toolchain/session.1.jsonl
@@ -1,17 +1,19 @@
 {"type":"session","version":0,"id":"22222222-2222-4222-8222-222222222222","createdAt":1783950001000,"cwd":"{{cwd}}","parentSession":"11111111-1111-4111-8111-111111111111","origin":"subagent","delegationDepth":1}
-{"type":"turn/start","seq":0,"time":1783957884563,"data":{"turn":1,"trigger":{"kind":"message","source":{"kind":"user"}}}}
-{"type":"user/message","seq":1,"time":1783957884563,"data":{"content":[{"type":"text","text":"Reply with exactly DIRECT_CHILD_OK and nothing else."}],"source":{"kind":"user"},"role":"user","id":"9769d9fc-4aef-45ae-bea7-dfa1697971ef"},"surfaceOp":"append"}
-{"type":"session/title","seq":2,"time":1783957884563,"data":{"title":"Reply with exactly DIRECT_CHILD_OK and","messageSeqs":[1],"source":{"kind":"fallback"}}}
-{"type":"subagent/descriptor","seq":3,"time":1785534720685,"data":{"version":2,"mode":"one-shot","provider":"spawn","label":"Check direct child"}}
-{"type":"user/message","seq":4,"time":1785534720686,"data":{"content":[{"type":"text","text":"Current runtime context. This snapshot supersedes earlier runtime-context snapshots.\n\nCurrent DSH file policy: danger-full-access. The DSH file sandbox does not restrict file modifications by available operations.\n\nApproval prompts are disabled in this session: actions that require approval are rejected automatically — do not request sandbox escalation (do not set `sandbox_permissions`)."}],"source":{"kind":"plugin","plugin":"@deepseek-ai/dsh-system-prompt"},"role":"user","id":"7fd53a8f-7165-47ea-adcf-84a8d303ec47"},"surfaceOp":"append"}
-{"type":"step/start","seq":5,"time":1785534720686,"data":{"turn":1,"step":1}}
-{"type":"request/header","seq":6,"time":1785534720686,"data":{"header":{"config":{"provider":"deepseek-official","model":"deepseek-v4-flash"},"system":"{{system}}","tools":"{{tools}}"},"reason":"initial"}}
-{"type":"request/context","seq":7,"time":1785534720687,"data":{"provider":"deepseek-official","model":"deepseek-v4-flash"}}
-{"type":"assistant/chunk","seq":8,"time":1783957884564,"data":{"turn":1,"step":1,"chunk":{"type":"block-start","index":0,"blockType":"text"}}}
-{"type":"assistant/chunk","seq":9,"time":1783957884564,"data":{"turn":1,"step":1,"chunk":{"type":"text-delta","index":0,"text":"DIRECT_CHILD_OK"}}}
-{"type":"assistant/chunk","seq":10,"time":1785464659110,"data":{"turn":1,"step":1,"chunk":{"type":"block-end","index":0,"block":{"type":"text","text":"DIRECT_CHILD_OK"}}}}
-{"type":"assistant/chunk","seq":11,"time":1785487621180,"data":{"turn":1,"step":1,"chunk":{"type":"usage","usage":{"inputTokens":3,"outputTokens":3}}}}
-{"type":"assistant/chunk","seq":12,"time":1785534720695,"data":{"turn":1,"step":1,"chunk":{"type":"finish","reason":{"kind":"stop"}}}}
-{"type":"assistant/message","seq":13,"time":1785534720695,"data":{"turn":1,"step":1,"message":{"role":"assistant","content":[{"type":"text","text":"DIRECT_CHILD_OK"}],"source":{"kind":"model","provider":"deepseek-official","model":"deepseek-v4-flash"},"id":"7032baa0-b8a1-4c26-8064-8a95f6fc7309"},"usage":{"inputTokens":3,"outputTokens":3}},"sourceEventSeqs":[8,9,10,11,12],"surfaceOp":"append"}
-{"type":"step/end","seq":14,"time":1785534720695,"data":{"turn":1,"step":1}}
-{"type":"turn/end","seq":15,"time":1785534720695,"data":{"turn":1,"reason":{"kind":"completed"}}}
+{"type":"agent/inbox/spliced","seq":0,"time":1785498801881,"data":{"target":"next-turn","start":0,"inserted":[{"content":[{"type":"text","text":"Reply with exactly DIRECT_CHILD_OK and nothing else."}],"source":{"kind":"user"},"role":"user","id":"ebe0cfa0-a909-47e0-8294-28ad84a8fe77"}]}}
+{"type":"turn/start","seq":1,"time":1785821418076,"data":{"turn":1}}
+{"type":"agent/inbox/spliced","seq":2,"time":1785821418076,"data":{"target":"next-turn","start":0,"removedCount":1,"inserted":[]}}
+{"type":"subagent/descriptor","seq":3,"time":1785821418091,"data":{"version":2,"mode":"one-shot","provider":"spawn","label":"Check direct child"}}
+{"type":"step/start","seq":4,"time":1785730458555,"data":{"turn":1,"step":1}}
+{"type":"user/message","seq":5,"time":1785730458555,"data":{"content":[{"type":"text","text":"Reply with exactly DIRECT_CHILD_OK and nothing else."}],"source":{"kind":"user"},"role":"user","id":"ebe0cfa0-a909-47e0-8294-28ad84a8fe77"},"surfaceOp":"append"}
+{"type":"user/message","seq":6,"time":1785730458555,"data":{"content":[{"type":"text","text":"Current runtime context. This snapshot supersedes earlier runtime-context snapshots.\n\nCurrent DSH file policy: danger-full-access. The DSH file sandbox does not restrict file modifications by available operations.\n\nApproval prompts are disabled in this session: actions that require approval are rejected automatically — do not request sandbox escalation (do not set `sandbox_permissions`)."}],"source":{"kind":"plugin","plugin":"@deepseek-ai/dsh-system-prompt","form":"snapshot","sections":[{"name":"sandbox:policy","text":"Current DSH file policy: danger-full-access. The DSH file sandbox does not restrict file modifications by available operations."},{"name":"approval:policy","text":"Approval prompts are disabled in this session: actions that require approval are rejected automatically — do not request sandbox escalation (do not set `sandbox_permissions`)."}]},"role":"user","id":"f9a2d1b6-8f23-43a5-8702-d413fed40990"},"surfaceOp":"append"}
+{"type":"session/title","seq":7,"time":1785730458555,"data":{"title":"Reply with exactly DIRECT_CHILD_OK and","messageSeqs":[5],"source":{"kind":"fallback"}}}
+{"type":"request/header","seq":8,"time":1785730458555,"data":{"header":{"config":{"provider":"deepseek-official","model":"deepseek-v4-flash"},"system":"{{system}}","tools":"{{tools}}"},"reason":"initial"}}
+{"type":"request/context","seq":9,"time":1785730458555,"data":{"provider":"deepseek-official","model":"deepseek-v4-flash"}}
+{"type":"assistant/chunk","seq":10,"time":1783957884564,"data":{"turn":1,"step":1,"chunk":{"type":"block-start","index":0,"blockType":"text"}}}
+{"type":"assistant/chunk","seq":11,"time":1783957884564,"data":{"turn":1,"step":1,"chunk":{"type":"text-delta","index":0,"text":"DIRECT_CHILD_OK"}}}
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--- a/examples/acp-agent/tests/snapshots/advanced-toolchain/session.2.jsonl
+++ b/examples/acp-agent/tests/snapshots/advanced-toolchain/session.2.jsonl
@@ -1,17 +1,19 @@
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--- a/examples/acp-agent/tests/snapshots/advanced-toolchain/session.jsonl
+++ b/examples/acp-agent/tests/snapshots/advanced-toolchain/session.jsonl
@@ -1,68 +1,70 @@
 {"type":"session","version":0,"id":"11111111-1111-4111-8111-111111111111","createdAt":1783950000000,"cwd":"{{cwd}}","delegationDepth":0}
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-{"type":"user/message","seq":1,"time":1783957884479,"data":{"content":[{"type":"text","text":"Run this advanced flow exactly once: try a no-op temporary Cordis Plugin named snapshot-marker; use run_code to inspect the live temporary Plugins through tools.cordis_inspect; delegate once to a direct spawn child; run one workflow that delegates to another spawn child; stop dyn-1; then reply with exactly ADVANCED_ACP_OK."}],"source":{"kind":"user"},"role":"user","id":"d65944b9-834c-4b58-a7c7-c0040ce4d9dc"},"surfaceOp":"append"}
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-{"type":"assistant/chunk","seq":60,"time":1783957884720,"data":{"turn":1,"step":6,"chunk":{"type":"text-delta","index":0,"text":"ADVANCED_ACP_OK"}}}
-{"type":"assistant/chunk","seq":61,"time":1785036891804,"data":{"turn":1,"step":6,"chunk":{"type":"block-end","index":0,"block":{"type":"text","text":"ADVANCED_ACP_OK"}}}}
-{"type":"assistant/chunk","seq":62,"time":1785464659324,"data":{"turn":1,"step":6,"chunk":{"type":"usage","usage":{"inputTokens":3,"outputTokens":3}}}}
-{"type":"assistant/chunk","seq":63,"time":1785487621391,"data":{"turn":1,"step":6,"chunk":{"type":"finish","reason":{"kind":"stop"}}}}
-{"type":"assistant/message","seq":64,"time":1785487621392,"data":{"turn":1,"step":6,"message":{"role":"assistant","content":[{"type":"text","text":"ADVANCED_ACP_OK"}],"source":{"kind":"model","provider":"deepseek-official","model":"deepseek-v4-flash"},"id":"ed857166-2e7d-4153-807f-d321a87c043e"},"usage":{"inputTokens":3,"outputTokens":3}},"sourceEventSeqs":[59,60,61,62,63],"surfaceOp":"append"}
-{"type":"step/end","seq":65,"time":1785487621392,"data":{"turn":1,"step":6}}
-{"type":"turn/end","seq":66,"time":1785487621392,"data":{"turn":1,"reason":{"kind":"completed"}}}
+{"type":"agent/inbox/spliced","seq":0,"time":1785498801734,"data":{"target":"next-turn","start":0,"inserted":[{"content":[{"type":"text","text":"Run this advanced flow exactly once: try a no-op temporary Cordis Plugin named snapshot-marker; use run_code to inspect the live temporary Plugins through tools.cordis_inspect; delegate once to a direct spawn child; run one workflow that delegates to another spawn child; stop dyn-1; then reply with exactly ADVANCED_ACP_OK."}],"source":{"kind":"user"},"role":"user","id":"6e45782a-31be-4ba7-8c4a-7411a2027e36"}]}}
+{"type":"turn/start","seq":1,"time":1785821417918,"data":{"turn":1}}
+{"type":"agent/inbox/spliced","seq":2,"time":1785821417919,"data":{"target":"next-turn","start":0,"removedCount":1,"inserted":[]}}
+{"type":"step/start","seq":3,"time":1783957884486,"data":{"turn":1,"step":1}}
+{"type":"user/message","seq":4,"time":1785498801761,"data":{"content":[{"type":"text","text":"Run this advanced flow exactly once: try a no-op temporary Cordis Plugin named snapshot-marker; use run_code to inspect the live temporary Plugins through tools.cordis_inspect; delegate once to a direct spawn child; run one workflow that delegates to another spawn child; stop dyn-1; then reply with exactly ADVANCED_ACP_OK."}],"source":{"kind":"user"},"role":"user","id":"6e45782a-31be-4ba7-8c4a-7411a2027e36"},"surfaceOp":"append"}
+{"type":"user/message","seq":5,"time":1785730458430,"data":{"content":[{"type":"text","text":"Current runtime context. This snapshot supersedes earlier runtime-context snapshots.\n\nCurrent DSH file policy: danger-full-access. The DSH file sandbox does not restrict file modifications by available operations.\n\nApproval prompts are disabled in this session: actions that require approval are rejected automatically — do not request sandbox escalation (do not set `sandbox_permissions`)."}],"source":{"kind":"plugin","plugin":"@deepseek-ai/dsh-system-prompt","form":"snapshot","sections":[{"name":"sandbox:policy","text":"Current DSH file policy: danger-full-access. The DSH file sandbox does not restrict file modifications by available operations."},{"name":"approval:policy","text":"Approval prompts are disabled in this session: actions that require approval are rejected automatically — do not request sandbox escalation (do not set `sandbox_permissions`)."}]},"role":"user","id":"9f38e2b8-1d4e-4c90-8896-00aa42307ea7"},"surfaceOp":"append"}
+{"type":"session/title","seq":6,"time":1785730458430,"data":{"title":"Run this advanced flow exactly","messageSeqs":[4],"source":{"kind":"fallback"}}}
+{"type":"request/header","seq":7,"time":1785498801765,"data":{"header":{"config":{"provider":"deepseek-official","model":"deepseek-v4-flash"},"system":"{{system}}","tools":"{{tools}}"},"reason":"initial"}}
+{"type":"request/context","seq":8,"time":1785730458431,"data":{"provider":"deepseek-official","model":"deepseek-v4-flash"}}
+{"type":"assistant/chunk","seq":9,"time":1783950000007,"data":{"turn":1,"step":1,"chunk":{"type":"block-start","index":0,"blockType":"tool-call"}}}
+{"type":"assistant/chunk","seq":10,"time":1783950000008,"data":{"turn":1,"step":1,"chunk":{"type":"tool-call-delta","index":0,"id":"advanced-mount","name":"cordis_mount","argumentsDelta":"{\"code\":\"return { name: 'snapshot-marker', apply() {} }\"}"}}}
+{"type":"assistant/chunk","seq":11,"time":1783950000009,"data":{"turn":1,"step":1,"chunk":{"type":"block-end","index":0,"block":{"type":"tool-call","id":"advanced-mount","name":"cordis_mount","arguments":"{\"code\":\"return { name: 'snapshot-marker', apply() {} }\"}"}}}}
+{"type":"assistant/chunk","seq":12,"time":1785498801774,"data":{"turn":1,"step":1,"chunk":{"type":"usage","usage":{"inputTokens":3,"outputTokens":3}}}}
+{"type":"assistant/chunk","seq":13,"time":1785730458439,"data":{"turn":1,"step":1,"chunk":{"type":"finish","reason":{"kind":"tool-calls"}}}}
+{"type":"assistant/message","seq":14,"time":1785730458440,"data":{"turn":1,"step":1,"message":{"role":"assistant","content":[{"type":"tool-call","id":"advanced-mount","name":"cordis_mount","arguments":"{\"code\":\"return { name: 'snapshot-marker', apply() {} }\"}"}],"source":{"kind":"model","provider":"deepseek-official","model":"deepseek-v4-flash"},"id":"0713b7ec-0182-4820-8ec1-39d0371b533b"},"usage":{"inputTokens":3,"outputTokens":3}},"sourceEventSeqs":[9,10,11,12,13],"surfaceOp":"append"}
+{"type":"tool/call","seq":15,"time":1785730458440,"data":{"turn":1,"step":1,"callId":"advanced-mount","name":"cordis_mount","arguments":"{\"code\":\"return { name: 'snapshot-marker', apply() {} }\"}"}}
+{"type":"tool/result","seq":16,"time":1785730458450,"data":{"turn":1,"step":1,"message":{"source":{"kind":"tool","callId":"advanced-mount"},"content":[{"type":"tool-result","toolCallId":"advanced-mount","content":[{"type":"text","text":"Temporary Plugin dyn-1 is running (plugin \"snapshot-marker\"; available until unmounted or DSH restarts)."}],"isError":false}],"role":"user","id":"b10e76f0-e1a5-4c2c-b6a2-6cbdcf259cca"}},"sourceEventSeqs":[15],"surfaceOp":"append"}
+{"type":"step/end","seq":17,"time":1785730458450,"data":{"turn":1,"step":1}}
+{"type":"step/start","seq":18,"time":1785730458460,"data":{"turn":1,"step":2}}
+{"type":"assistant/chunk","seq":19,"time":1783950000017,"data":{"turn":1,"step":2,"chunk":{"type":"block-start","index":0,"blockType":"tool-call"}}}
+{"type":"assistant/chunk","seq":20,"time":1783950000018,"data":{"turn":1,"step":2,"chunk":{"type":"tool-call-delta","index":0,"id":"advanced-code","name":"run_code","argumentsDelta":"{\"code\": \"return await tools.cordis_inspect({ what: 'temporary' })\", \"description\": \"Run the scripted inspection program\"}"}}}
+{"type":"assistant/chunk","seq":21,"time":1783950000019,"data":{"turn":1,"step":2,"chunk":{"type":"block-end","index":0,"block":{"type":"tool-call","id":"advanced-code","name":"run_code","arguments":"{\"code\": \"return await tools.cordis_inspect({ what: 'temporary' })\", \"description\": \"Run the scripted inspection program\"}"}}}}
+{"type":"assistant/chunk","seq":22,"time":1785498801800,"data":{"turn":1,"step":2,"chunk":{"type":"usage","usage":{"inputTokens":3,"outputTokens":3}}}}
+{"type":"assistant/chunk","seq":23,"time":1785730458465,"data":{"turn":1,"step":2,"chunk":{"type":"finish","reason":{"kind":"tool-calls"}}}}
+{"type":"assistant/message","seq":24,"time":1785730458465,"data":{"turn":1,"step":2,"message":{"role":"assistant","content":[{"type":"tool-call","id":"advanced-code","name":"run_code","arguments":"{\"code\": \"return await tools.cordis_inspect({ what: 'temporary' })\", \"description\": \"Run the scripted inspection program\"}"}],"source":{"kind":"model","provider":"deepseek-official","model":"deepseek-v4-flash"},"id":"e3061430-3f2d-4dd8-a3ee-c0fde800547d"},"usage":{"inputTokens":3,"outputTokens":3}},"sourceEventSeqs":[19,20,21,22,23],"surfaceOp":"append"}
+{"type":"tool/call","seq":25,"time":1785730458465,"data":{"turn":1,"step":2,"callId":"advanced-code","name":"run_code","arguments":"{\"code\": \"return await tools.cordis_inspect({ what: 'temporary' })\", \"description\": \"Run the scripted inspection program\"}"}}
+{"type":"tool/code-dispatch-start","seq":26,"time":1785730458517,"data":{"parentCallId":"advanced-code","subCallId":"advanced-code:code:1","name":"cordis_inspect","arguments":{"what":"temporary"}}}
+{"type":"tool/code-dispatch","seq":27,"time":1785730458518,"data":{"parentCallId":"advanced-code","subCallId":"advanced-code:code:1","name":"cordis_inspect","arguments":{"what":"temporary"},"isError":false,"content":[{"type":"text","text":"## Temporary Plugins\n- Temporary Plugin dyn-1: snapshot-marker [running] — provides: none; waiting for: none; lifetime: until unmounted or DSH restarts"}]}}
+{"type":"tool/result","seq":28,"time":1785730458520,"data":{"turn":1,"step":2,"message":{"source":{"kind":"tool","callId":"advanced-code"},"content":[{"type":"tool-result","toolCallId":"advanced-code","content":[{"type":"text","text":"## Temporary Plugins\n- Temporary Plugin dyn-1: snapshot-marker [running] — provides: none; waiting for: none; lifetime: until unmounted or DSH restarts"}],"isError":false}],"role":"user","id":"4dce223d-0097-4ac2-a717-d1c430240cef"}},"sourceEventSeqs":[25],"surfaceOp":"append"}
+{"type":"step/end","seq":29,"time":1785730458520,"data":{"turn":1,"step":2}}
+{"type":"step/start","seq":30,"time":1785730458527,"data":{"turn":1,"step":3}}
+{"type":"assistant/chunk","seq":31,"time":1783950000029,"data":{"turn":1,"step":3,"chunk":{"type":"block-start","index":0,"blockType":"tool-call"}}}
+{"type":"assistant/chunk","seq":32,"time":1783950000030,"data":{"turn":1,"step":3,"chunk":{"type":"tool-call-delta","index":0,"id":"advanced-direct-child","name":"subagent","argumentsDelta":"{\"description\":\"Check direct child\",\"prompt\":\"Reply with exactly DIRECT_CHILD_OK and nothing else.\"}"}}}
+{"type":"assistant/chunk","seq":33,"time":1785036891179,"data":{"turn":1,"step":3,"chunk":{"type":"block-end","index":0,"block":{"type":"tool-call","id":"advanced-direct-child","name":"subagent","arguments":"{\"description\":\"Check direct child\",\"prompt\":\"Reply with exactly DIRECT_CHILD_OK and nothing else.\"}"}}}}
+{"type":"assistant/chunk","seq":34,"time":1785498801872,"data":{"turn":1,"step":3,"chunk":{"type":"usage","usage":{"inputTokens":3,"outputTokens":3}}}}
+{"type":"assistant/chunk","seq":35,"time":1785730458531,"data":{"turn":1,"step":3,"chunk":{"type":"finish","reason":{"kind":"tool-calls"}}}}
+{"type":"assistant/message","seq":36,"time":1785730458531,"data":{"turn":1,"step":3,"message":{"role":"assistant","content":[{"type":"tool-call","id":"advanced-direct-child","name":"subagent","arguments":"{\"description\":\"Check direct child\",\"prompt\":\"Reply with exactly DIRECT_CHILD_OK and nothing else.\"}"}],"source":{"kind":"model","provider":"deepseek-official","model":"deepseek-v4-flash"},"id":"51fe1d59-eebc-457b-a072-fe217546ff04"},"usage":{"inputTokens":3,"outputTokens":3}},"sourceEventSeqs":[31,32,33,34,35],"surfaceOp":"append"}
+{"type":"tool/call","seq":37,"time":1785730458531,"data":{"turn":1,"step":3,"callId":"advanced-direct-child","name":"subagent","arguments":"{\"description\":\"Check direct child\",\"prompt\":\"Reply with exactly DIRECT_CHILD_OK and nothing else.\"}"}}
+{"type":"tool/result","seq":38,"time":1785730458562,"data":{"turn":1,"step":3,"message":{"source":{"kind":"tool","callId":"advanced-direct-child"},"content":[{"type":"tool-result","toolCallId":"advanced-direct-child","content":[{"type":"text","text":"DIRECT_CHILD_OK"}],"isError":false}],"role":"user","id":"09028579-5ae5-4d57-955e-02504f4dfc2a"}},"sourceEventSeqs":[37],"surfaceOp":"append"}
+{"type":"step/end","seq":39,"time":1785730458563,"data":{"turn":1,"step":3}}
+{"type":"step/start","seq":40,"time":1785730458572,"data":{"turn":1,"step":4}}
+{"type":"assistant/chunk","seq":41,"time":1783957884594,"data":{"turn":1,"step":4,"chunk":{"type":"block-start","index":0,"blockType":"tool-call"}}}
+{"type":"assistant/chunk","seq":42,"time":1783957884594,"data":{"turn":1,"step":4,"chunk":{"type":"tool-call-delta","index":0,"id":"advanced-workflow","name":"workflow","argumentsDelta":"{\"script\":\"phase('Delegate')\\nconst reply = await agent('Reply with exactly WORKFLOW_CHILD_OK and nothing else.', { label: 'workflow-child' })\\nreturn { reply }\",\"meta\":{\"name\":\"advanced-acp-snapshot\",\"description\":\"exercise one workflow child through ACP\"}}"}}}
+{"type":"assistant/chunk","seq":43,"time":1785036891211,"data":{"turn":1,"step":4,"chunk":{"type":"block-end","index":0,"block":{"type":"tool-call","id":"advanced-workflow","name":"workflow","arguments":"{\"script\":\"phase('Delegate')\\nconst reply = await agent('Reply with exactly WORKFLOW_CHILD_OK and nothing else.', { label: 'workflow-child' })\\nreturn { reply }\",\"meta\":{\"name\":\"advanced-acp-snapshot\",\"description\":\"exercise one workflow child through ACP\"}}"}}}}
+{"type":"assistant/chunk","seq":44,"time":1785498801920,"data":{"turn":1,"step":4,"chunk":{"type":"usage","usage":{"inputTokens":3,"outputTokens":3}}}}
+{"type":"assistant/chunk","seq":45,"time":1785730458577,"data":{"turn":1,"step":4,"chunk":{"type":"finish","reason":{"kind":"tool-calls"}}}}
+{"type":"assistant/message","seq":46,"time":1785730458577,"data":{"turn":1,"step":4,"message":{"role":"assistant","content":[{"type":"tool-call","id":"advanced-workflow","name":"workflow","arguments":"{\"script\":\"phase('Delegate')\\nconst reply = await agent('Reply with exactly WORKFLOW_CHILD_OK and nothing else.', { label: 'workflow-child' })\\nreturn { reply }\",\"meta\":{\"name\":\"advanced-acp-snapshot\",\"description\":\"exercise one workflow child through ACP\"}}"}],"source":{"kind":"model","provider":"deepseek-official","model":"deepseek-v4-flash"},"id":"ebeca5c6-68ae-43b3-87c3-c48fdfe416c8"},"usage":{"inputTokens":3,"outputTokens":3}},"sourceEventSeqs":[41,42,43,44,45],"surfaceOp":"append"}
+{"type":"tool/call","seq":47,"time":1785730458577,"data":{"turn":1,"step":4,"callId":"advanced-workflow","name":"workflow","arguments":"{\"script\":\"phase('Delegate')\\nconst reply = await agent('Reply with exactly WORKFLOW_CHILD_OK and nothing else.', { label: 'workflow-child' })\\nreturn { reply }\",\"meta\":{\"name\":\"advanced-acp-snapshot\",\"description\":\"exercise one workflow child through ACP\"}}"}}
+{"type":"tool/result","seq":48,"time":1785730458711,"data":{"turn":1,"step":4,"message":{"source":{"kind":"tool","callId":"advanced-workflow"},"content":[{"type":"tool-result","toolCallId":"advanced-workflow","content":[{"type":"text","text":"workflow \"advanced-acp-snapshot\" completed (1 agent).\nReturn value:\n{\n  \"reply\": \"WORKFLOW_CHILD_OK\"\n}"}],"isError":false}],"role":"user","id":"f892f17e-1e93-4f4b-9e9e-15116593b6fc"}},"sourceEventSeqs":[47],"surfaceOp":"append"}
+{"type":"step/end","seq":49,"time":1785730458711,"data":{"turn":1,"step":4}}
+{"type":"step/start","seq":50,"time":1785730458723,"data":{"turn":1,"step":5}}
+{"type":"assistant/chunk","seq":51,"time":1783957884719,"data":{"turn":1,"step":5,"chunk":{"type":"block-start","index":0,"blockType":"tool-call"}}}
+{"type":"assistant/chunk","seq":52,"time":1783957884719,"data":{"turn":1,"step":5,"chunk":{"type":"tool-call-delta","index":0,"id":"advanced-unmount","name":"cordis_unmount","argumentsDelta":"{\"id\":\"dyn-1\"}"}}}
+{"type":"assistant/chunk","seq":53,"time":1785036891795,"data":{"turn":1,"step":5,"chunk":{"type":"block-end","index":0,"block":{"type":"tool-call","id":"advanced-unmount","name":"cordis_unmount","arguments":"{\"id\":\"dyn-1\"}"}}}}
+{"type":"assistant/chunk","seq":54,"time":1785498802087,"data":{"turn":1,"step":5,"chunk":{"type":"usage","usage":{"inputTokens":3,"outputTokens":3}}}}
+{"type":"assistant/chunk","seq":55,"time":1785730458728,"data":{"turn":1,"step":5,"chunk":{"type":"finish","reason":{"kind":"tool-calls"}}}}
+{"type":"assistant/message","seq":56,"time":1785730458728,"data":{"turn":1,"step":5,"message":{"role":"assistant","content":[{"type":"tool-call","id":"advanced-unmount","name":"cordis_unmount","arguments":"{\"id\":\"dyn-1\"}"}],"source":{"kind":"model","provider":"deepseek-official","model":"deepseek-v4-flash"},"id":"1291ce3c-e568-4f0d-a95a-5157b8b2cc75"},"usage":{"inputTokens":3,"outputTokens":3}},"sourceEventSeqs":[51,52,53,54,55],"surfaceOp":"append"}
+{"type":"tool/call","seq":57,"time":1785730458728,"data":{"turn":1,"step":5,"callId":"advanced-unmount","name":"cordis_unmount","arguments":"{\"id\":\"dyn-1\"}"}}
+{"type":"tool/result","seq":58,"time":1785730458735,"data":{"turn":1,"step":5,"message":{"source":{"kind":"tool","callId":"advanced-unmount"},"content":[{"type":"tool-result","toolCallId":"advanced-unmount","content":[{"type":"text","text":"Temporary Plugin dyn-1 was unmounted and removed."}],"isError":false}],"role":"user","id":"b3634221-2358-4e82-aac5-e37f0a115023"}},"sourceEventSeqs":[57],"surfaceOp":"append"}
+{"type":"step/end","seq":59,"time":1785730458735,"data":{"turn":1,"step":5}}
+{"type":"step/start","seq":60,"time":1785730458747,"data":{"turn":1,"step":6}}
+{"type":"assistant/chunk","seq":61,"time":1783957884720,"data":{"turn":1,"step":6,"chunk":{"type":"block-start","index":0,"blockType":"text"}}}
+{"type":"assistant/chunk","seq":62,"time":1783957884720,"data":{"turn":1,"step":6,"chunk":{"type":"text-delta","index":0,"text":"ADVANCED_ACP_OK"}}}
+{"type":"assistant/chunk","seq":63,"time":1785036891804,"data":{"turn":1,"step":6,"chunk":{"type":"block-end","index":0,"block":{"type":"text","text":"ADVANCED_ACP_OK"}}}}
+{"type":"assistant/chunk","seq":64,"time":1785498802107,"data":{"turn":1,"step":6,"chunk":{"type":"usage","usage":{"inputTokens":3,"outputTokens":3}}}}
+{"type":"assistant/chunk","seq":65,"time":1785730458751,"data":{"turn":1,"step":6,"chunk":{"type":"finish","reason":{"kind":"stop"}}}}
+{"type":"assistant/message","seq":66,"time":1785730458751,"data":{"turn":1,"step":6,"message":{"role":"assistant","content":[{"type":"text","text":"ADVANCED_ACP_OK"}],"source":{"kind":"model","provider":"deepseek-official","model":"deepseek-v4-flash"},"id":"a32b89ce-13ed-48ba-a7f9-24144b94ec56"},"usage":{"inputTokens":3,"outputTokens":3}},"sourceEventSeqs":[61,62,63,64,65],"surfaceOp":"append"}
+{"type":"step/end","seq":67,"time":1785730458751,"data":{"turn":1,"step":6}}
+{"type":"turn/end","seq":68,"time":1785730458751,"data":{"turn":1,"reason":{"kind":"completed"}}}
--- a/examples/acp-agent/tests/snapshots/advanced-toolchain/system-prompt.expected.md
+++ b/examples/acp-agent/tests/snapshots/advanced-toolchain/system-prompt.expected.md
@@ -60,7 +60,7 @@ interface ToolArgsMap {
    /** Exact service key or event name whose original JSDoc to include; valid only with what:"api" or what:"events". */
    name?: string;
  } & Record<string, JsonValue>;
-  /** Mount a temporary Cordis Plugin in the current DSH process. This creates an in-memory runtime Plugin, not an installed or configured Plugin. It remains active across later turns until cordis_unmount, toolset unload, or DSH restart. It does not create files, install a package, change cordis.yml or personal/project config, survive restart, or automatically become permanent. To keep it, ask the Agent to implement a normal local, project, or repository Plugin through the regular development workflow. It may affect other sessions in the same process; the sandbox is not a security boundary, and injected services reach the real runtime. `code` runs now as the body of an async JavaScript function in an isolated sandbox and MUST `return` a plugin. Two forms: FUNCTION form `return (ctx) => { … }` — declares no inject, so it can register tools, listen to events, and provide services, but reaching ANY service (e.g. ctx.bash) throws; use it only when you need no services. OBJECT form `return { name?, inject: ['bash', 'llm', …], apply(ctx) { … } }` — declares dependencies, and cordis activates the plugin only after the services exist; PREFER this form. You may reach ONLY the services you list in inject: an undeclared service throws even if it exists, because an undeclared dependency would not be cleaned up if its provider is unmounted. BEFORE calling a service from your code, read cordis_inspect what:"api" — it lists method signatures AND the type shapes of their arguments/returns (do not guess a field's type; e.g. a bash run's stdout is an object, not a string). Inside `apply`, use the standard cordis API: `ctx.on(event, listener)` to observe events (see cordis_inspect what:"events"), or call `harness.registerTool(ctx, harness.defineTool({ name, description, parameters: { text: { type: 'string', required: true } }, output: { schema: { type: 'string' }, render(_args, value) { return [{ type: 'text', text: value }] } }, async execute(args) { return args.text } }))` to give yourself a new tool — it becomes callable on your NEXT step. Tool parameters: each key IS a property — { type: 'string'|'number'|'integer'|'boolean'|'null'|'object'|'array'|'json', required?: true, description?, enum?, const?, items?, properties? }; every direct DSL object declares additionalProperties: true|false, and oneOf: [schema, schema, ...] replaces type for an exact-one union. A raw JSON-Schema { type: 'object', properties, required?: […] } wrapper is also accepted with open-by-default objects. A tool's `execute` MUST return the lossless JSON value declared by `output.schema`; `output.render(args, value)` separately returns Native/model content blocks. Temporary Plugins can COMPOSE: one Plugin may `ctx.provide('name', value)` a service and another may declare `inject: ['name']` to consume it — the consumer stays pending until the provider exists and returns to pending when the provider is unmounted. Everything registered inside `apply` is cleaned up automatically by cordis_unmount. Sandbox globals: `console` (tagged `[cordis:<id>]`, writes through to the harness terminal), `harness.defineTool`, `harness.registerTool`, `btoa`, `atob`, `TextEncoder`, `TextDecoder`. Node APIs are DISABLED — do filesystem/network/timer work through the cordis services, never Node built-ins: `require`, `setTimeout`/`setInterval`, and `fetch` throw redirect errors; `process` and `Buffer` are undefined. Instead use inject: ['fs'] + ctx.fs for files, inject: ['web'] + ctx.web for HTTP, inject: ['bash'] + ctx.bash for processes, and inject: ['timer'] + ctx.setTimeout/ctx.setInterval for timing (fiber effects, auto-cleaned when unmounted) — cordis_inspect what:"api" shows what THIS runtime provides. Write PLAIN JavaScript, not TypeScript (no `as`, no type annotations). Cautions: (1) waterfall events (e.g. tools/pre-execute) hand the listener a trailing `next` callback which MUST be called — returning without `next()` VETOES the call; prefer plain notification events unless you intend to intercept. (2) Never await something that only resolves after the current turn (your code runs INSIDE a tool call of that turn — it would deadlock). (3) Your `ctx` is a restricted façade: you can register tools, observe events, provide/consume services, and use timers, but framework internals (ctx.root, ctx.fiber, ctx.extend, ctx.plugin, …) are withheld. It is not a security boundary though — the services you inject (e.g. ctx.bash) reach the real runtime. */
+  /** Mount a temporary Cordis Plugin in the current DSH process. This creates an in-memory runtime Plugin, not an installed or configured Plugin. It remains active across later turns until cordis_unmount, toolset unload, or DSH restart. It does not create files, install a package, change cordis.yml or personal/project config, survive restart, or automatically become permanent. To keep it, ask the Agent to implement a normal local, project, or repository Plugin through the regular development workflow. It may affect other sessions in the same process; the sandbox is not a security boundary, and injected services reach the real runtime. `code` runs now as the body of an async JavaScript function in an isolated sandbox and MUST `return` a plugin. Two forms: FUNCTION form `return (ctx) => { … }` — declares no inject, so it can register tools, listen to events, and provide services, but reaching ANY service (e.g. ctx.bash) throws; use it only when you need no services. OBJECT form `return { name?, inject: ['bash', 'llm', …], apply(ctx) { … } }` — declares dependencies, and cordis activates the plugin only after the services exist; PREFER this form. You may reach ONLY the services you list in inject: an undeclared service throws even if it exists, because an undeclared dependency would not be cleaned up if its provider is unmounted. BEFORE calling a service from your code, read cordis_inspect what:"api" — it lists method signatures AND the type shapes of their arguments/returns (do not guess a field's type; e.g. a bash run's stdout is an object, not a string). Inside `apply`, use the standard cordis API: `ctx.on(event, listener)` to observe events (see cordis_inspect what:"events"), or call `harness.registerTool(ctx, harness.defineTool({ name, description, parameters: { text: { type: 'string', required: true } }, output: { schema: { type: 'string' }, render(_args, value) { return [{ type: 'text', text: value }] } }, async execute(args) { return args.text } }))` to give yourself a new tool — it becomes callable on your NEXT step. Tool parameters: each key IS a property — { type: 'string'|'number'|'integer'|'boolean'|'null'|'object'|'array'|'json', required?: true, description?, enum?, const?, items?, properties? }; every direct DSL object declares additionalProperties: true|false, and oneOf: [schema, schema, ...] replaces type for an exact-one union. A raw JSON-Schema { type: 'object', properties, required?: […] } wrapper is also accepted with open-by-default objects. A tool's `execute` MUST return the lossless JSON value declared by `output.schema`; `output.render(args, value)` separately returns Native/model content blocks. Temporary Plugins can COMPOSE: one Plugin may `ctx.provide('name', value)` a service and another may declare `inject: ['name']` to consume it — the consumer stays pending until the provider exists and returns to pending when the provider is unmounted. Everything registered inside `apply` is cleaned up automatically by cordis_unmount. Sandbox globals: `console` (tagged `[cordis:<id>]`, writes through to the harness terminal), `harness.defineTool`, `harness.registerTool`, `btoa`, `atob`, `TextEncoder`, `TextDecoder`. Node APIs are DISABLED — do filesystem/network/timer work through the cordis services, never Node built-ins: `require`, `setTimeout`/`setInterval`, and `fetch` throw redirect errors; `process` and `Buffer` are undefined. Instead use inject: ['fs'] + ctx.fs for files, inject: ['web'] + ctx.web for HTTP, inject: ['bash'] + ctx.bash for processes, and inject: ['timer'] + ctx.setTimeout/ctx.setInterval for timing (fiber effects, auto-cleaned when unmounted) — cordis_inspect what:"api" shows what THIS runtime provides. Write PLAIN JavaScript, not TypeScript (no `as`, no type annotations). Cautions: (1) waterfall events (e.g. tools/pre-execute) hand the listener a trailing `next` callback which MUST be called — returning without `next()` SHORT-CIRCUITS the call; prefer plain notification events unless you intend to intercept. (2) Never await something that only resolves after the current turn (your code runs INSIDE a tool call of that turn — it would deadlock). (3) Your `ctx` is a restricted façade: you can register tools, observe events, provide/consume services, and use timers, but framework internals (ctx.root, ctx.fiber, ctx.extend, ctx.plugin, …) are withheld. It is not a security boundary though — the services you inject (e.g. ctx.bash) reach the real runtime. */
  cordis_mount: {
    /** JavaScript body returning a temporary Plugin; evaluated now and saved nowhere. */
    code: string;
@@ -94,8 +94,16 @@ interface ToolArgsMap {
  } & Record<string, JsonValue>;
  /** Read the current same-session goal, including its exact id/revision, objective, phase, completed continuation rounds, round limit, blocker reason when present, and whether another continuation is armed. Call this before updating a goal. */
  get_goal: Record<string, JsonValue>;
-  /** List your continuable background subagents by durable id and label. Status is a snapshot of the stored record: running means the subagent session is currently live in this process, complete means it exists only in storage and a `send_message` starts a new turn on the same conversation. The snapshot is not a delivery promise — `send_message` performs the authoritative check and may still fail. Children that could not be read are reported as diagnostics instead of being silently dropped. */
-  list_agents: Record<string, JsonValue>;
+  /** Request cancellation of a background agent's current turn by its agent id. The target may be your direct child or a deeper agent created under you. Only the current turn stops: messages already queued for the agent stay parked until a later send_message, agents it started keep running, and the agent itself stays available for follow-ups. This call returns as soon as the stop request is accepted, so the target may keep running briefly; interrupting an agent that already finished is an accepted no-op. */
+  interrupt_agent: {
+    /** The agent id of the running agent to interrupt. */
+    agent_id: string;
+  } & Record<string, JsonValue>;
+  /** List your continuable background subagents by durable id and label. Status comes from the live registry: running means the agent is working right now, idle means it is loaded but between turns (it may be waiting on agents it started), and complete means it exists only in storage — a direct child remains a `send_message` candidate in every status. The snapshot is not a delivery promise — `send_message` performs the authoritative check and may still fail. Children that could not be read are reported as diagnostics instead of being silently dropped. Scope `descendants` walks the whole tree below you in stable pre-order, annotating each entry with its durable direct-parent session id and depth. You may use `send_message` only for depth-1 entries; deeper entries are candidates for `interrupt_agent` only. */
+  list_agents: {
+    /** children (default) lists direct children only; descendants walks the complete tree below you. */
+    scope?: "children" | "descendants";
+  } & Record<string, JsonValue>;
  /** Run a foreground fresh-agent Ralph loop toward one immutable objective. Use only when the direct human explicitly asks for Ralph or fresh-agent iteration. Each round opens a new child with no parent conversation or prior child session; the shared workspace is long-term memory, and only a bounded structured report crosses rounds. The call returns when a worker reports completion or a concrete blocker, or at the round limit. Ordinary long-running same-session work belongs to goal tools. */
  ralph: {
    /** The immutable completion objective for every fresh Ralph round. */
@@ -160,7 +168,7 @@ interface ToolArgsMap {
    /** Max wait in milliseconds (only meaningful with wait: true). Defaults to the configured wait timeout; capped by the configured maximum. */
    timeout_ms?: number;
  } & Record<string, JsonValue>;
-  /** Record and update a structured task list for the current work. Send the ENTIRE list every call — it REPLACES the previous list (there are no partial updates, no per-item edits). Use it to plan multi-step work and show progress: add one todo per concrete step before you start. Keep AT MOST ONE todo `in_progress` at a time; while work remains, exactly one active task should be `in_progress`. Mark a todo `completed` the moment it is done (do not batch completions), and allow no `in_progress` item only once all work is complete. Skip the list for trivial single-step tasks. Statuses: `pending` (not started), `in_progress` (being worked on now), `completed` (finished). */
+  /** Record and update a structured task list for the current work. Send the ENTIRE list every call — it REPLACES the previous list (there are no partial updates, no per-item edits). Use it to plan multi-step work and show progress: add one todo per concrete step before you start. Mark every todo being actively worked on `in_progress` — several at once when work genuinely runs in parallel (e.g. concurrent subagents or background commands), one for sequential work; while work remains, at least one task should be `in_progress`. Mark a todo `completed` the moment it is done (do not batch completions), and allow no `in_progress` item only once all work is complete. Skip the list for trivial single-step tasks. Statuses: `pending` (not started), `in_progress` (being worked on now), `completed` (finished). */
  todo_write: {
    /** The COMPLETE task list, replacing any previous list. */
    todos: ({
@@ -304,15 +312,22 @@ interface ToolOutputMap {
    };
    activation: "armed" | "disarmed";
  };
+  interrupt_agent: {
+    accepted: boolean;
+  };
  list_agents: ({
    kind: "child";
    id: string;
    label: string;
-    status: "running" | "complete";
+    status: "running" | "idle" | "complete";
+    parent?: string;
+    depth?: number;
  } | {
    kind: "diagnostic";
    id: string;
    reason: "corrupt" | "unsupported" | "unavailable";
+    parent?: string;
+    depth?: number;
  })[];
  ralph: {
    runId: string;
--- a/examples/acp-agent/tests/snapshots/advanced-toolchain/tool-schemas.expected.json
+++ b/examples/acp-agent/tests/snapshots/advanced-toolchain/tool-schemas.expected.json
@@ -72,7 +72,7 @@
    },
    {
      "name": "cordis_mount",
-      "description": "Mount a temporary Cordis Plugin in the current DSH process. This creates an in-memory runtime Plugin, not an installed or configured Plugin. It remains active across later turns until cordis_unmount, toolset unload, or DSH restart. It does not create files, install a package, change cordis.yml or personal/project config, survive restart, or automatically become permanent. To keep it, ask the Agent to implement a normal local, project, or repository Plugin through the regular development workflow. It may affect other sessions in the same process; the sandbox is not a security boundary, and injected services reach the real runtime. `code` runs now as the body of an async JavaScript function in an isolated sandbox and MUST `return` a plugin. Two forms: FUNCTION form `return (ctx) => { … }` — declares no inject, so it can register tools, listen to events, and provide services, but reaching ANY service (e.g. ctx.bash) throws; use it only when you need no services. OBJECT form `return { name?, inject: ['bash', 'llm', …], apply(ctx) { … } }` — declares dependencies, and cordis activates the plugin only after the services exist; PREFER this form. You may reach ONLY the services you list in inject: an undeclared service throws even if it exists, because an undeclared dependency would not be cleaned up if its provider is unmounted. BEFORE calling a service from your code, read cordis_inspect what:\"api\" — it lists method signatures AND the type shapes of their arguments/returns (do not guess a field's type; e.g. a bash run's stdout is an object, not a string). Inside `apply`, use the standard cordis API: `ctx.on(event, listener)` to observe events (see cordis_inspect what:\"events\"), or call `harness.registerTool(ctx, harness.defineTool({ name, description, parameters: { text: { type: 'string', required: true } }, output: { schema: { type: 'string' }, render(_args, value) { return [{ type: 'text', text: value }] } }, async execute(args) { return args.text } }))` to give yourself a new tool — it becomes callable on your NEXT step. Tool parameters: each key IS a property — { type: 'string'|'number'|'integer'|'boolean'|'null'|'object'|'array'|'json', required?: true, description?, enum?, const?, items?, properties? }; every direct DSL object declares additionalProperties: true|false, and oneOf: [schema, schema, ...] replaces type for an exact-one union. A raw JSON-Schema { type: 'object', properties, required?: […] } wrapper is also accepted with open-by-default objects. A tool's `execute` MUST return the lossless JSON value declared by `output.schema`; `output.render(args, value)` separately returns Native/model content blocks. Temporary Plugins can COMPOSE: one Plugin may `ctx.provide('name', value)` a service and another may declare `inject: ['name']` to consume it — the consumer stays pending until the provider exists and returns to pending when the provider is unmounted. Everything registered inside `apply` is cleaned up automatically by cordis_unmount. Sandbox globals: `console` (tagged `[cordis:<id>]`, writes through to the harness terminal), `harness.defineTool`, `harness.registerTool`, `btoa`, `atob`, `TextEncoder`, `TextDecoder`. Node APIs are DISABLED — do filesystem/network/timer work through the cordis services, never Node built-ins: `require`, `setTimeout`/`setInterval`, and `fetch` throw redirect errors; `process` and `Buffer` are undefined. Instead use inject: ['fs'] + ctx.fs for files, inject: ['web'] + ctx.web for HTTP, inject: ['bash'] + ctx.bash for processes, and inject: ['timer'] + ctx.setTimeout/ctx.setInterval for timing (fiber effects, auto-cleaned when unmounted) — cordis_inspect what:\"api\" shows what THIS runtime provides. Write PLAIN JavaScript, not TypeScript (no `as`, no type annotations). Cautions: (1) waterfall events (e.g. tools/pre-execute) hand the listener a trailing `next` callback which MUST be called — returning without `next()` VETOES the call; prefer plain notification events unless you intend to intercept. (2) Never await something that only resolves after the current turn (your code runs INSIDE a tool call of that turn — it would deadlock). (3) Your `ctx` is a restricted façade: you can register tools, observe events, provide/consume services, and use timers, but framework internals (ctx.root, ctx.fiber, ctx.extend, ctx.plugin, …) are withheld. It is not a security boundary though — the services you inject (e.g. ctx.bash) reach the real runtime.",
+      "description": "Mount a temporary Cordis Plugin in the current DSH process. This creates an in-memory runtime Plugin, not an installed or configured Plugin. It remains active across later turns until cordis_unmount, toolset unload, or DSH restart. It does not create files, install a package, change cordis.yml or personal/project config, survive restart, or automatically become permanent. To keep it, ask the Agent to implement a normal local, project, or repository Plugin through the regular development workflow. It may affect other sessions in the same process; the sandbox is not a security boundary, and injected services reach the real runtime. `code` runs now as the body of an async JavaScript function in an isolated sandbox and MUST `return` a plugin. Two forms: FUNCTION form `return (ctx) => { … }` — declares no inject, so it can register tools, listen to events, and provide services, but reaching ANY service (e.g. ctx.bash) throws; use it only when you need no services. OBJECT form `return { name?, inject: ['bash', 'llm', …], apply(ctx) { … } }` — declares dependencies, and cordis activates the plugin only after the services exist; PREFER this form. You may reach ONLY the services you list in inject: an undeclared service throws even if it exists, because an undeclared dependency would not be cleaned up if its provider is unmounted. BEFORE calling a service from your code, read cordis_inspect what:\"api\" — it lists method signatures AND the type shapes of their arguments/returns (do not guess a field's type; e.g. a bash run's stdout is an object, not a string). Inside `apply`, use the standard cordis API: `ctx.on(event, listener)` to observe events (see cordis_inspect what:\"events\"), or call `harness.registerTool(ctx, harness.defineTool({ name, description, parameters: { text: { type: 'string', required: true } }, output: { schema: { type: 'string' }, render(_args, value) { return [{ type: 'text', text: value }] } }, async execute(args) { return args.text } }))` to give yourself a new tool — it becomes callable on your NEXT step. Tool parameters: each key IS a property — { type: 'string'|'number'|'integer'|'boolean'|'null'|'object'|'array'|'json', required?: true, description?, enum?, const?, items?, properties? }; every direct DSL object declares additionalProperties: true|false, and oneOf: [schema, schema, ...] replaces type for an exact-one union. A raw JSON-Schema { type: 'object', properties, required?: […] } wrapper is also accepted with open-by-default objects. A tool's `execute` MUST return the lossless JSON value declared by `output.schema`; `output.render(args, value)` separately returns Native/model content blocks. Temporary Plugins can COMPOSE: one Plugin may `ctx.provide('name', value)` a service and another may declare `inject: ['name']` to consume it — the consumer stays pending until the provider exists and returns to pending when the provider is unmounted. Everything registered inside `apply` is cleaned up automatically by cordis_unmount. Sandbox globals: `console` (tagged `[cordis:<id>]`, writes through to the harness terminal), `harness.defineTool`, `harness.registerTool`, `btoa`, `atob`, `TextEncoder`, `TextDecoder`. Node APIs are DISABLED — do filesystem/network/timer work through the cordis services, never Node built-ins: `require`, `setTimeout`/`setInterval`, and `fetch` throw redirect errors; `process` and `Buffer` are undefined. Instead use inject: ['fs'] + ctx.fs for files, inject: ['web'] + ctx.web for HTTP, inject: ['bash'] + ctx.bash for processes, and inject: ['timer'] + ctx.setTimeout/ctx.setInterval for timing (fiber effects, auto-cleaned when unmounted) — cordis_inspect what:\"api\" shows what THIS runtime provides. Write PLAIN JavaScript, not TypeScript (no `as`, no type annotations). Cautions: (1) waterfall events (e.g. tools/pre-execute) hand the listener a trailing `next` callback which MUST be called — returning without `next()` SHORT-CIRCUITS the call; prefer plain notification events unless you intend to intercept. (2) Never await something that only resolves after the current turn (your code runs INSIDE a tool call of that turn — it would deadlock). (3) Your `ctx` is a restricted façade: you can register tools, observe events, provide/consume services, and use timers, but framework internals (ctx.root, ctx.fiber, ctx.extend, ctx.plugin, …) are withheld. It is not a security boundary though — the services you inject (e.g. ctx.bash) reach the real runtime.",
      "parameters": {
        "type": "object",
        "properties": {
@@ -173,11 +173,36 @@
      }
    },
    {
-      "name": "list_agents",
-      "description": "List your continuable background subagents by durable id and label. Status is a snapshot of the stored record: running means the subagent session is currently live in this process, complete means it exists only in storage and a `send_message` starts a new turn on the same conversation. The snapshot is not a delivery promise — `send_message` performs the authoritative check and may still fail. Children that could not be read are reported as diagnostics instead of being silently dropped.",
+      "name": "interrupt_agent",
+      "description": "Request cancellation of a background agent's current turn by its agent id. The target may be your direct child or a deeper agent created under you. Only the current turn stops: messages already queued for the agent stay parked until a later send_message, agents it started keep running, and the agent itself stays available for follow-ups. This call returns as soon as the stop request is accepted, so the target may keep running briefly; interrupting an agent that already finished is an accepted no-op.",
      "parameters": {
        "type": "object",
-        "properties": {}
+        "properties": {
+          "agent_id": {
+            "type": "string",
+            "description": "The agent id of the running agent to interrupt."
+          }
+        },
+        "required": [
+          "agent_id"
+        ]
+      }
+    },
+    {
+      "name": "list_agents",
+      "description": "List your continuable background subagents by durable id and label. Status comes from the live registry: running means the agent is working right now, idle means it is loaded but between turns (it may be waiting on agents it started), and complete means it exists only in storage — a direct child remains a `send_message` candidate in every status. The snapshot is not a delivery promise — `send_message` performs the authoritative check and may still fail. Children that could not be read are reported as diagnostics instead of being silently dropped. Scope `descendants` walks the whole tree below you in stable pre-order, annotating each entry with its durable direct-parent session id and depth. You may use `send_message` only for depth-1 entries; deeper entries are candidates for `interrupt_agent` only.",
+      "parameters": {
+        "type": "object",
+        "properties": {
+          "scope": {
+            "type": "string",
+            "description": "children (default) lists direct children only; descendants walks the complete tree below you.",
+            "enum": [
+              "children",
+              "descendants"
+            ]
+          }
+        }
      }
    },
    {
@@ -386,7 +411,7 @@
    },
    {
      "name": "todo_write",
-      "description": "Record and update a structured task list for the current work. Send the ENTIRE list every call — it REPLACES the previous list (there are no partial updates, no per-item edits). Use it to plan multi-step work and show progress: add one todo per concrete step before you start. Keep AT MOST ONE todo `in_progress` at a time; while work remains, exactly one active task should be `in_progress`. Mark a todo `completed` the moment it is done (do not batch completions), and allow no `in_progress` item only once all work is complete. Skip the list for trivial single-step tasks. Statuses: `pending` (not started), `in_progress` (being worked on now), `completed` (finished).",
+      "description": "Record and update a structured task list for the current work. Send the ENTIRE list every call — it REPLACES the previous list (there are no partial updates, no per-item edits). Use it to plan multi-step work and show progress: add one todo per concrete step before you start. Mark every todo being actively worked on `in_progress` — several at once when work genuinely runs in parallel (e.g. concurrent subagents or background commands), one for sequential work; while work remains, at least one task should be `in_progress`. Mark a todo `completed` the moment it is done (do not batch completions), and allow no `in_progress` item only once all work is complete. Skip the list for trivial single-step tasks. Statuses: `pending` (not started), `in_progress` (being worked on now), `completed` (finished).",
      "parameters": {
        "type": "object",
        "properties": {
--- a/examples/acp-agent/tests/snapshots/bash-spill/session.jsonl
+++ b/examples/acp-agent/tests/snapshots/bash-spill/session.jsonl
@@ -1,26 +1,28 @@
 {"type":"session","version":0,"id":"{{sessionId}}","createdAt":0,"cwd":"{{cwd}}","delegationDepth":0}
-{"type":"turn/start","seq":0,"time":0,"data":{"turn":1,"trigger":{"kind":"message","source":{"kind":"user"}}}}
-{"type":"user/message","seq":1,"time":0,"data":{"content":[{"type":"text","text":"Use the bash tool to print a large deterministic output, then reply DONE."}],"source":{"kind":"user"},"role":"user","id":"955895f6-6350-4083-b030-0f0ac825ad96"},"surfaceOp":"append"}
-{"type":"session/title","seq":2,"time":0,"data":{"title":"Use the bash tool to","messageSeqs":[1],"source":{"kind":"fallback"}}}
-{"type":"user/message","seq":3,"time":1785464634096,"data":{"content":[{"type":"text","text":"Current runtime context. This snapshot supersedes earlier runtime-context snapshots.\n\nCurrent DSH file policy: danger-full-access. The DSH file sandbox does not restrict file modifications by available operations.\n\nApproval prompts are disabled in this session: actions that require approval are rejected automatically — do not request sandbox escalation (do not set `sandbox_permissions`)."}],"source":{"kind":"plugin","plugin":"@deepseek-ai/dsh-system-prompt"},"role":"user","id":"0ad16754-a62f-4241-bfb3-3b92b15970b5"},"surfaceOp":"append"}
-{"type":"step/start","seq":4,"time":1785464634096,"data":{"turn":1,"step":1}}
-{"type":"request/header","seq":5,"time":1785464634097,"data":{"header":{"config":{"provider":"deepseek-official","model":"deepseek-v4-flash"},"system":"{{system}}","tools":"{{tools}}"},"reason":"initial"}}
-{"type":"request/context","seq":6,"time":1785487582288,"data":{"provider":"deepseek-official","model":"deepseek-v4-flash"}}
-{"type":"assistant/chunk","seq":7,"time":0,"data":{"turn":1,"step":1,"chunk":{"type":"block-start","index":0,"blockType":"tool-call"}}}
-{"type":"assistant/chunk","seq":8,"time":0,"data":{"turn":1,"step":1,"chunk":{"type":"tool-call-delta","index":0,"id":"call_spill","name":"bash","argumentsDelta":"{\"command\":\"node -e \\\"process.stdout.write('SPILL_START-' + 'x'.repeat(2000) + '-SPILL_END')\\\"\",\"description\":\"Print large deterministic output\"}"}}}
-{"type":"assistant/chunk","seq":9,"time":0,"data":{"turn":1,"step":1,"chunk":{"type":"block-end","index":0,"block":{"type":"tool-call","id":"call_spill","name":"bash","arguments":"{\"command\":\"node -e \\\"process.stdout.write('SPILL_START-' + 'x'.repeat(2000) + '-SPILL_END')\\\"\",\"description\":\"Print large deterministic output\"}"}}}}
-{"type":"assistant/chunk","seq":10,"time":1785464634106,"data":{"turn":1,"step":1,"chunk":{"type":"usage","usage":{"inputTokens":10,"outputTokens":5}}}}
-{"type":"assistant/chunk","seq":11,"time":1785487582296,"data":{"turn":1,"step":1,"chunk":{"type":"finish","reason":{"kind":"tool-calls"}}}}
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+{"type":"assistant/chunk","seq":111,"time":1785014507359,"data":{"turn":1,"step":2,"chunk":{"type":"block-start","index":0,"blockType":"reasoning"}}}
+{"type":"reasoning-chunks","seq0":112,"time0":1785014507404,"data":{"turn":1,"step":2,"index":0,"dt":[0,0,0,1,0,41,80,0,0,0,4,0,41,0,0,42,0,0,43,0,0,1,41,0,0,42,0,1,0,0],"texts":["The"," output"," is"," \"","B","OTH","_OK","\""," (","with"," a"," trailing"," new","line",","," but"," that","'s"," fine",")."," The"," user"," asked"," me"," to"," reply"," with"," that"," output"," only","."]}}
+{"type":"assistant/chunk","seq":143,"time":1785014507741,"data":{"turn":1,"step":2,"chunk":{"type":"block-start","index":1,"blockType":"text"}}}
+{"type":"text-chunks","seq0":144,"time0":1785014507784,"data":{"turn":1,"step":2,"index":1,"dt":[1,0],"texts":["B","OTH","_OK"]}}
+{"type":"assistant/chunk","seq":147,"time":1785014507785,"data":{"turn":1,"step":2,"chunk":{"type":"block-end","index":0,"block":{"type":"reasoning","text":"The output is \"BOTH_OK\" (with a trailing newline, but that's fine). The user asked me to reply with that output only."}}}}
+{"type":"assistant/chunk","seq":148,"time":1785014507785,"data":{"turn":1,"step":2,"chunk":{"type":"block-end","index":1,"block":{"type":"text","text":"BOTH_OK"}}}}
+{"type":"assistant/chunk","seq":149,"time":1785498827217,"data":{"turn":1,"step":2,"chunk":{"type":"usage","usage":{"inputTokens":50,"outputTokens":35,"cacheReadTokens":10496,"reasoningTokens":31}}}}
+{"type":"assistant/chunk","seq":150,"time":1785730479437,"data":{"turn":1,"step":2,"chunk":{"type":"finish","reason":{"kind":"stop"}}}}
+{"type":"assistant/message","seq":151,"time":1785730479437,"data":{"turn":1,"step":2,"message":{"role":"assistant","content":[{"type":"reasoning","text":"The output is \"BOTH_OK\" (with a trailing newline, but that's fine). The user asked me to reply with that output only."},{"type":"text","text":"BOTH_OK"}],"source":{"kind":"model","provider":"deepseek-official","model":"deepseek-v4-flash"},"id":"dbd0a9c9-1f19-405d-ad05-86f90447e006"},"usage":{"inputTokens":50,"outputTokens":35,"cacheReadTokens":10496,"reasoningTokens":31}},"sourceEventSeqs":[111,112,113,114,115,116,117,118,119,120,121,122,123,124,125,126,127,128,129,130,131,132,133,134,135,136,137,138,139,140,141,142,143,144,145,146,147,148,149,150],"surfaceOp":"append"}
+{"type":"step/end","seq":152,"time":1785730479437,"data":{"turn":1,"step":2}}
+{"type":"turn/end","seq":153,"time":1785730479437,"data":{"turn":1,"reason":{"kind":"completed"}}}
--- a/examples/acp-agent/tests/snapshots/both-mode-turn/tool-schemas.expected.json
+++ b/examples/acp-agent/tests/snapshots/both-mode-turn/tool-schemas.expected.json
@@ -116,11 +116,36 @@
      }
    },
    {
-      "name": "list_agents",
-      "description": "List your continuable background subagents by durable id and label. Status is a snapshot of the stored record: running means the subagent session is currently live in this process, complete means it exists only in storage and a `send_message` starts a new turn on the same conversation. The snapshot is not a delivery promise — `send_message` performs the authoritative check and may still fail. Children that could not be read are reported as diagnostics instead of being silently dropped.",
+      "name": "interrupt_agent",
+      "description": "Request cancellation of a background agent's current turn by its agent id. The target may be your direct child or a deeper agent created under you. Only the current turn stops: messages already queued for the agent stay parked until a later send_message, agents it started keep running, and the agent itself stays available for follow-ups. This call returns as soon as the stop request is accepted, so the target may keep running briefly; interrupting an agent that already finished is an accepted no-op.",
      "parameters": {
        "type": "object",
-        "properties": {}
+        "properties": {
+          "agent_id": {
+            "type": "string",
+            "description": "The agent id of the running agent to interrupt."
+          }
+        },
+        "required": [
+          "agent_id"
+        ]
+      }
+    },
+    {
+      "name": "list_agents",
+      "description": "List your continuable background subagents by durable id and label. Status comes from the live registry: running means the agent is working right now, idle means it is loaded but between turns (it may be waiting on agents it started), and complete means it exists only in storage — a direct child remains a `send_message` candidate in every status. The snapshot is not a delivery promise — `send_message` performs the authoritative check and may still fail. Children that could not be read are reported as diagnostics instead of being silently dropped. Scope `descendants` walks the whole tree below you in stable pre-order, annotating each entry with its durable direct-parent session id and depth. You may use `send_message` only for depth-1 entries; deeper entries are candidates for `interrupt_agent` only.",
+      "parameters": {
+        "type": "object",
+        "properties": {
+          "scope": {
+            "type": "string",
+            "description": "children (default) lists direct children only; descendants walks the complete tree below you.",
+            "enum": [
+              "children",
+              "descendants"
+            ]
+          }
+        }
      }
    },
    {
@@ -329,7 +354,7 @@
    },
    {
      "name": "todo_write",
-      "description": "Record and update a structured task list for the current work. Send the ENTIRE list every call — it REPLACES the previous list (there are no partial updates, no per-item edits). Use it to plan multi-step work and show progress: add one todo per concrete step before you start. Keep AT MOST ONE todo `in_progress` at a time; while work remains, exactly one active task should be `in_progress`. Mark a todo `completed` the moment it is done (do not batch completions), and allow no `in_progress` item only once all work is complete. Skip the list for trivial single-step tasks. Statuses: `pending` (not started), `in_progress` (being worked on now), `completed` (finished).",
+      "description": "Record and update a structured task list for the current work. Send the ENTIRE list every call — it REPLACES the previous list (there are no partial updates, no per-item edits). Use it to plan multi-step work and show progress: add one todo per concrete step before you start. Mark every todo being actively worked on `in_progress` — several at once when work genuinely runs in parallel (e.g. concurrent subagents or background commands), one for sequential work; while work remains, at least one task should be `in_progress`. Mark a todo `completed` the moment it is done (do not batch completions), and allow no `in_progress` item only once all work is complete. Skip the list for trivial single-step tasks. Statuses: `pending` (not started), `in_progress` (being worked on now), `completed` (finished).",
      "parameters": {
        "type": "object",
        "properties": {
--- a/examples/acp-agent/tests/snapshots/cancel-tool-calls/session.jsonl
+++ b/examples/acp-agent/tests/snapshots/cancel-tool-calls/session.jsonl
@@ -1,23 +1,25 @@
 {"type":"session","version":0,"id":"{{sessionId}}","createdAt":0,"cwd":"{{cwd}}","delegationDepth":0}
-{"type":"turn/start","seq":0,"time":1784437195072,"data":{"turn":1,"trigger":{"kind":"message","source":{"kind":"user"}}}}
-{"type":"user/message","seq":1,"time":1784437195072,"data":{"content":[{"type":"text","text":"Run two shell commands: wait for cancellation, then write skipped.txt."}],"source":{"kind":"user"},"role":"user","id":"f6cbfd65-b797-44f2-a069-88fade8be54c"},"surfaceOp":"append"}
-{"type":"session/title","seq":2,"time":1784437195072,"data":{"title":"Run two shell commands: wait","messageSeqs":[1],"source":{"kind":"fallback"}}}
-{"type":"user/message","seq":3,"time":1785464652437,"data":{"content":[{"type":"text","text":"Current runtime context. This snapshot supersedes earlier runtime-context snapshots.\n\nCurrent DSH file policy: danger-full-access. The DSH file sandbox does not restrict file modifications by available operations.\n\nApproval prompts are disabled in this session: actions that require approval are rejected automatically — do not request sandbox escalation (do not set `sandbox_permissions`)."}],"source":{"kind":"plugin","plugin":"@deepseek-ai/dsh-system-prompt"},"role":"user","id":"6e19a845-6916-4a14-bbeb-3ec64dc8aa58"},"surfaceOp":"append"}
-{"type":"step/start","seq":4,"time":1785464652437,"data":{"turn":1,"step":1}}
-{"type":"request/header","seq":5,"time":1785464652437,"data":{"header":{"config":{"provider":"deepseek-official","model":"deepseek-v4-flash"},"system":"{{system}}","tools":"{{tools}}"},"reason":"initial"}}
-{"type":"request/context","seq":6,"time":1785487611310,"data":{"provider":"deepseek-official","model":"deepseek-v4-flash"}}
-{"type":"assistant/chunk","seq":7,"time":1784437195077,"data":{"turn":1,"step":1,"chunk":{"type":"block-start","index":0,"blockType":"tool-call"}}}
-{"type":"assistant/chunk","seq":8,"time":1784437195077,"data":{"turn":1,"step":1,"chunk":{"type":"tool-call-delta","index":0,"id":"call_wait","name":"bash","argumentsDelta":"{\"command\":\"node -e \\\"require('node:fs').writeFileSync('started.txt', 'started'); setInterval(() => {}, 1000)\\\"\",\"description\":\"Wait until cancellation\"}"}}}
-{"type":"assistant/chunk","seq":9,"time":1784437195077,"data":{"turn":1,"step":1,"chunk":{"type":"block-end","index":0,"block":{"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":"assistant/chunk","seq":10,"time":1784437195077,"data":{"turn":1,"step":1,"chunk":{"type":"block-start","index":1,"blockType":"tool-call"}}}
-{"type":"assistant/chunk","seq":11,"time":1784437195077,"data":{"turn":1,"step":1,"chunk":{"type":"tool-call-delta","index":1,"id":"call_skipped","name":"bash","argumentsDelta":"{\"command\":\"printf skipped > skipped.txt\",\"description\":\"Write skipped marker\"}"}}}
-{"type":"assistant/chunk","seq":12,"time":1784437195077,"data":{"turn":1,"step":1,"chunk":{"type":"block-end","index":1,"block":{"type":"tool-call","id":"call_skipped","name":"bash","arguments":"{\"command\":\"printf skipped > skipped.txt\",\"description\":\"Write skipped marker\"}"}}}}
-{"type":"assistant/chunk","seq":13,"time":1785464652446,"data":{"turn":1,"step":1,"chunk":{"type":"usage","usage":{"inputTokens":10,"outputTokens":10}}}}
-{"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/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}}
-{"type":"turn/end","seq":21,"time":1785487611378,"data":{"turn":1,"reason":{"kind":"aborted"}}}
+{"type":"agent/inbox/spliced","seq":0,"time":1785498792491,"data":{"target":"next-turn","start":0,"inserted":[{"content":[{"type":"text","text":"Run two shell commands: wait for cancellation, then write skipped.txt."}],"source":{"kind":"user"},"role":"user","id":"6025dc7c-dc38-4a34-b7b1-688102631c75"}]}}
+{"type":"turn/start","seq":1,"time":1785821402705,"data":{"turn":1}}
+{"type":"agent/inbox/spliced","seq":2,"time":1785821402705,"data":{"target":"next-turn","start":0,"removedCount":1,"inserted":[]}}
+{"type":"step/start","seq":3,"time":1784437195076,"data":{"turn":1,"step":1}}
+{"type":"user/message","seq":4,"time":1785498792518,"data":{"content":[{"type":"text","text":"Run two shell commands: wait for cancellation, then write skipped.txt."}],"source":{"kind":"user"},"role":"user","id":"6025dc7c-dc38-4a34-b7b1-688102631c75"},"surfaceOp":"append"}
+{"type":"user/message","seq":5,"time":1785730445587,"data":{"content":[{"type":"text","text":"Current runtime context. This snapshot supersedes earlier runtime-context snapshots.\n\nCurrent DSH file policy: danger-full-access. The DSH file sandbox does not restrict file modifications by available operations.\n\nApproval prompts are disabled in this session: actions that require approval are rejected automatically — do not request sandbox escalation (do not set `sandbox_permissions`)."}],"source":{"kind":"plugin","plugin":"@deepseek-ai/dsh-system-prompt","form":"snapshot","sections":[{"name":"sandbox:policy","text":"Current DSH file policy: danger-full-access. The DSH file sandbox does not restrict file modifications by available operations."},{"name":"approval:policy","text":"Approval prompts are disabled in this session: actions that require approval are rejected automatically — do not request sandbox escalation (do not set `sandbox_permissions`)."}]},"role":"user","id":"bf953438-d1c4-4e00-a06b-7f5e2da1df7a"},"surfaceOp":"append"}
+{"type":"session/title","seq":6,"time":1785730445587,"data":{"title":"Run two shell commands: wait","messageSeqs":[4],"source":{"kind":"fallback"}}}
+{"type":"request/header","seq":7,"time":1785498792519,"data":{"header":{"config":{"provider":"deepseek-official","model":"deepseek-v4-flash"},"system":"{{system}}","tools":"{{tools}}"},"reason":"initial"}}
+{"type":"request/context","seq":8,"time":1785730445588,"data":{"provider":"deepseek-official","model":"deepseek-v4-flash"}}
+{"type":"assistant/chunk","seq":9,"time":1784437195077,"data":{"turn":1,"step":1,"chunk":{"type":"block-start","index":0,"blockType":"tool-call"}}}
+{"type":"assistant/chunk","seq":10,"time":1784437195077,"data":{"turn":1,"step":1,"chunk":{"type":"tool-call-delta","index":0,"id":"call_wait","name":"bash","argumentsDelta":"{\"command\":\"node -e \\\"require('node:fs').writeFileSync('started.txt', 'started'); setInterval(() => {}, 1000)\\\"\",\"description\":\"Wait until cancellation\"}"}}}
+{"type":"assistant/chunk","seq":11,"time":1784437195077,"data":{"turn":1,"step":1,"chunk":{"type":"block-end","index":0,"block":{"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":"assistant/chunk","seq":12,"time":1784437195077,"data":{"turn":1,"step":1,"chunk":{"type":"block-start","index":1,"blockType":"tool-call"}}}
+{"type":"assistant/chunk","seq":13,"time":1784437195077,"data":{"turn":1,"step":1,"chunk":{"type":"tool-call-delta","index":1,"id":"call_skipped","name":"bash","argumentsDelta":"{\"command\":\"printf skipped > skipped.txt\",\"description\":\"Write skipped marker\"}"}}}
+{"type":"assistant/chunk","seq":14,"time":1784437195077,"data":{"turn":1,"step":1,"chunk":{"type":"block-end","index":1,"block":{"type":"tool-call","id":"call_skipped","name":"bash","arguments":"{\"command\":\"printf skipped > skipped.txt\",\"description\":\"Write skipped marker\"}"}}}}
+{"type":"assistant/chunk","seq":15,"time":1785498792528,"data":{"turn":1,"step":1,"chunk":{"type":"usage","usage":{"inputTokens":10,"outputTokens":10}}}}
+{"type":"assistant/chunk","seq":16,"time":1785730445597,"data":{"turn":1,"step":1,"chunk":{"type":"finish","reason":{"kind":"tool-calls"}}}}
+{"type":"assistant/message","seq":17,"time":1785730445597,"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":"57600715-8366-4277-9cb3-3b6f55fef1ec"},"usage":{"inputTokens":10,"outputTokens":10}},"sourceEventSeqs":[9,10,11,12,13,14,15,16],"surfaceOp":"append"}
+{"type":"tool/call","seq":18,"time":1785730445598,"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":19,"time":1785730445645,"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":"f8706456-630a-419b-83b6-91a9f7e464d7"},"error":{"name":"AbortError","code":"ABORTED"}},"sourceEventSeqs":[18],"surfaceOp":"append"}
+{"type":"tool/call","seq":20,"time":1785730445645,"data":{"turn":1,"step":1,"callId":"call_skipped","name":"bash","arguments":"{\"command\":\"printf skipped > skipped.txt\",\"description\":\"Write skipped marker\"}"}}
+{"type":"tool/result","seq":21,"time":1785730445645,"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":"55c65cec-41ad-4361-bc86-e82b7726d445"},"error":{"name":"AbortError","code":"ABORTED_BEFORE_DISPATCH"}},"sourceEventSeqs":[20],"surfaceOp":"append"}
+{"type":"step/end","seq":22,"time":1785730445645,"data":{"turn":1,"step":1}}
+{"type":"turn/end","seq":23,"time":1785730445645,"data":{"turn":1,"reason":{"kind":"aborted","reason":{"kind":"user"}}}}
--- a/examples/acp-agent/tests/snapshots/cancel/session.jsonl
+++ b/examples/acp-agent/tests/snapshots/cancel/session.jsonl
@@ -1,12 +1,14 @@
 {"type":"session","version":0,"id":"{{sessionId}}","createdAt":0,"cwd":"{{cwd}}","delegationDepth":0}
-{"type":"turn/start","seq":0,"time":0,"data":{"turn":1,"trigger":{"kind":"message","source":{"kind":"user"}}}}
-{"type":"user/message","seq":1,"time":0,"data":{"content":[{"type":"text","text":"Start a long task; this turn will be cancelled mid-stream."}],"source":{"kind":"user"},"role":"user","id":"1d142a0f-dcce-4d62-8e77-110e88d5e33d"},"surfaceOp":"append"}
-{"type":"session/title","seq":2,"time":0,"data":{"title":"Start a long task; this","messageSeqs":[1],"source":{"kind":"fallback"}}}
-{"type":"user/message","seq":3,"time":1785464651681,"data":{"content":[{"type":"text","text":"Current runtime context. This snapshot supersedes earlier runtime-context snapshots.\n\nCurrent DSH file policy: danger-full-access. The DSH file sandbox does not restrict file modifications by available operations.\n\nApproval prompts are disabled in this session: actions that require approval are rejected automatically — do not request sandbox escalation (do not set `sandbox_permissions`)."}],"source":{"kind":"plugin","plugin":"@deepseek-ai/dsh-system-prompt"},"role":"user","id":"964bf863-c389-429a-8404-a1e84d63ea8c"},"surfaceOp":"append"}
-{"type":"step/start","seq":4,"time":1785464651681,"data":{"turn":1,"step":1}}
-{"type":"request/header","seq":5,"time":1785464651682,"data":{"header":{"config":{"provider":"deepseek-official","model":"deepseek-v4-flash"},"system":"{{system}}","tools":"{{tools}}"},"reason":"initial"}}
-{"type":"request/context","seq":6,"time":1785487610044,"data":{"provider":"deepseek-official","model":"deepseek-v4-flash"}}
-{"type":"assistant/chunk","seq":7,"time":1785464651691,"data":{"turn":1,"step":1,"chunk":{"type":"block-start","index":0,"blockType":"text"}}}
-{"type":"assistant/chunk","seq":8,"time":1785487610053,"data":{"turn":1,"step":1,"chunk":{"type":"text-delta","index":0,"text":"partial"}}}
-{"type":"step/end","seq":9,"time":1785487610062,"data":{"turn":1,"step":1}}
-{"type":"turn/end","seq":10,"time":1785487610062,"data":{"turn":1,"reason":{"kind":"aborted"}}}
+{"type":"agent/inbox/spliced","seq":0,"time":1785498791421,"data":{"target":"next-turn","start":0,"inserted":[{"content":[{"type":"text","text":"Start a long task; this turn will be cancelled mid-stream."}],"source":{"kind":"user"},"role":"user","id":"f74653c2-8793-4004-ab0d-833a8dfd42bf"}]}}
+{"type":"turn/start","seq":1,"time":1785821401560,"data":{"turn":1}}
+{"type":"agent/inbox/spliced","seq":2,"time":1785821401560,"data":{"target":"next-turn","start":0,"removedCount":1,"inserted":[]}}
+{"type":"step/start","seq":3,"time":0,"data":{"turn":1,"step":1}}
+{"type":"user/message","seq":4,"time":1785498791446,"data":{"content":[{"type":"text","text":"Start a long task; this turn will be cancelled mid-stream."}],"source":{"kind":"user"},"role":"user","id":"f74653c2-8793-4004-ab0d-833a8dfd42bf"},"surfaceOp":"append"}
+{"type":"user/message","seq":5,"time":1785730444531,"data":{"content":[{"type":"text","text":"Current runtime context. This snapshot supersedes earlier runtime-context snapshots.\n\nCurrent DSH file policy: danger-full-access. The DSH file sandbox does not restrict file modifications by available operations.\n\nApproval prompts are disabled in this session: actions that require approval are rejected automatically — do not request sandbox escalation (do not set `sandbox_permissions`)."}],"source":{"kind":"plugin","plugin":"@deepseek-ai/dsh-system-prompt","form":"snapshot","sections":[{"name":"sandbox:policy","text":"Current DSH file policy: danger-full-access. The DSH file sandbox does not restrict file modifications by available operations."},{"name":"approval:policy","text":"Approval prompts are disabled in this session: actions that require approval are rejected automatically — do not request sandbox escalation (do not set `sandbox_permissions`)."}]},"role":"user","id":"2c4c8dc2-5141-4963-adbc-5928729d3bf6"},"surfaceOp":"append"}
+{"type":"session/title","seq":6,"time":1785730444531,"data":{"title":"Start a long task; this","messageSeqs":[4],"source":{"kind":"fallback"}}}
+{"type":"request/header","seq":7,"time":1785498791447,"data":{"header":{"config":{"provider":"deepseek-official","model":"deepseek-v4-flash"},"system":"{{system}}","tools":"{{tools}}"},"reason":"initial"}}
+{"type":"request/context","seq":8,"time":1785730444532,"data":{"provider":"deepseek-official","model":"deepseek-v4-flash"}}
+{"type":"assistant/chunk","seq":9,"time":1785498791456,"data":{"turn":1,"step":1,"chunk":{"type":"block-start","index":0,"blockType":"text"}}}
+{"type":"assistant/chunk","seq":10,"time":1785730444541,"data":{"turn":1,"step":1,"chunk":{"type":"text-delta","index":0,"text":"partial"}}}
+{"type":"step/end","seq":11,"time":1785730444547,"data":{"turn":1,"step":1}}
+{"type":"turn/end","seq":12,"time":1785730444547,"data":{"turn":1,"reason":{"kind":"aborted","reason":{"kind":"user"}}}}
--- a/examples/acp-agent/tests/snapshots/code-mode-turn/session.jsonl
+++ b/examples/acp-agent/tests/snapshots/code-mode-turn/session.jsonl
@@ -1,36 +1,38 @@
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+{"type":"assistant/chunk","seq":248,"time":1785014444392,"data":{"turn":1,"step":2,"chunk":{"type":"block-end","index":0,"block":{"type":"reasoning","text":"The program ran successfully. The console.log output \"captured output\" appeared, and the return value is \"CODE_ONE+CODE_TWO\". The user asked me to reply with that joined string only."}}}}
+{"type":"assistant/chunk","seq":249,"time":1785014444392,"data":{"turn":1,"step":2,"chunk":{"type":"block-end","index":1,"block":{"type":"text","text":"CODE_ONE+CODE_TWO"}}}}
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+{"type":"assistant/message","seq":252,"time":1785730477165,"data":{"turn":1,"step":2,"message":{"role":"assistant","content":[{"type":"reasoning","text":"The program ran successfully. The console.log output \"captured output\" appeared, and the return value is \"CODE_ONE+CODE_TWO\". The user asked me to reply with that joined string only."},{"type":"text","text":"CODE_ONE+CODE_TWO"}],"source":{"kind":"model","provider":"deepseek-official","model":"deepseek-v4-flash"},"id":"e435b807-b35f-48d3-846f-a5c59333c316"},"usage":{"inputTokens":117,"outputTokens":50,"cacheReadTokens":6272,"reasoningTokens":42}},"sourceEventSeqs":[197,198,199,200,201,202,203,204,205,206,207,208,209,210,211,212,213,214,215,216,217,218,219,220,221,222,223,224,225,226,227,228,229,230,231,232,233,234,235,236,237,238,239,240,241,242,243,244,245,246,247,248,249,250,251],"surfaceOp":"append"}
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+{"type":"turn/end","seq":254,"time":1785730477165,"data":{"turn":1,"reason":{"kind":"completed"}}}
--- a/examples/acp-agent/tests/snapshots/code-mode-turn/system-prompt.expected.md
+++ b/examples/acp-agent/tests/snapshots/code-mode-turn/system-prompt.expected.md
@@ -77,8 +77,16 @@ interface ToolArgsMap {
  } & Record<string, JsonValue>;
  /** Read the current same-session goal, including its exact id/revision, objective, phase, completed continuation rounds, round limit, blocker reason when present, and whether another continuation is armed. Call this before updating a goal. */
  get_goal: Record<string, JsonValue>;
-  /** List your continuable background subagents by durable id and label. Status is a snapshot of the stored record: running means the subagent session is currently live in this process, complete means it exists only in storage and a `send_message` starts a new turn on the same conversation. The snapshot is not a delivery promise — `send_message` performs the authoritative check and may still fail. Children that could not be read are reported as diagnostics instead of being silently dropped. */
-  list_agents: Record<string, JsonValue>;
+  /** Request cancellation of a background agent's current turn by its agent id. The target may be your direct child or a deeper agent created under you. Only the current turn stops: messages already queued for the agent stay parked until a later send_message, agents it started keep running, and the agent itself stays available for follow-ups. This call returns as soon as the stop request is accepted, so the target may keep running briefly; interrupting an agent that already finished is an accepted no-op. */
+  interrupt_agent: {
+    /** The agent id of the running agent to interrupt. */
+    agent_id: string;
+  } & Record<string, JsonValue>;
+  /** List your continuable background subagents by durable id and label. Status comes from the live registry: running means the agent is working right now, idle means it is loaded but between turns (it may be waiting on agents it started), and complete means it exists only in storage — a direct child remains a `send_message` candidate in every status. The snapshot is not a delivery promise — `send_message` performs the authoritative check and may still fail. Children that could not be read are reported as diagnostics instead of being silently dropped. Scope `descendants` walks the whole tree below you in stable pre-order, annotating each entry with its durable direct-parent session id and depth. You may use `send_message` only for depth-1 entries; deeper entries are candidates for `interrupt_agent` only. */
+  list_agents: {
+    /** children (default) lists direct children only; descendants walks the complete tree below you. */
+    scope?: "children" | "descendants";
+  } & Record<string, JsonValue>;
  /** Run a foreground fresh-agent Ralph loop toward one immutable objective. Use only when the direct human explicitly asks for Ralph or fresh-agent iteration. Each round opens a new child with no parent conversation or prior child session; the shared workspace is long-term memory, and only a bounded structured report crosses rounds. The call returns when a worker reports completion or a concrete blocker, or at the round limit. Ordinary long-running same-session work belongs to goal tools. */
  ralph: {
    /** The immutable completion objective for every fresh Ralph round. */
@@ -143,7 +151,7 @@ interface ToolArgsMap {
    /** Max wait in milliseconds (only meaningful with wait: true). Defaults to the configured wait timeout; capped by the configured maximum. */
    timeout_ms?: number;
  } & Record<string, JsonValue>;
-  /** Record and update a structured task list for the current work. Send the ENTIRE list every call — it REPLACES the previous list (there are no partial updates, no per-item edits). Use it to plan multi-step work and show progress: add one todo per concrete step before you start. Keep AT MOST ONE todo `in_progress` at a time; while work remains, exactly one active task should be `in_progress`. Mark a todo `completed` the moment it is done (do not batch completions), and allow no `in_progress` item only once all work is complete. Skip the list for trivial single-step tasks. Statuses: `pending` (not started), `in_progress` (being worked on now), `completed` (finished). */
+  /** Record and update a structured task list for the current work. Send the ENTIRE list every call — it REPLACES the previous list (there are no partial updates, no per-item edits). Use it to plan multi-step work and show progress: add one todo per concrete step before you start. Mark every todo being actively worked on `in_progress` — several at once when work genuinely runs in parallel (e.g. concurrent subagents or background commands), one for sequential work; while work remains, at least one task should be `in_progress`. Mark a todo `completed` the moment it is done (do not batch completions), and allow no `in_progress` item only once all work is complete. Skip the list for trivial single-step tasks. Statuses: `pending` (not started), `in_progress` (being worked on now), `completed` (finished). */
  todo_write: {
    /** The COMPLETE task list, replacing any previous list. */
    todos: ({
@@ -275,15 +283,22 @@ interface ToolOutputMap {
    };
    activation: "armed" | "disarmed";
  };
+  interrupt_agent: {
+    accepted: boolean;
+  };
  list_agents: ({
    kind: "child";
    id: string;
    label: string;
-    status: "running" | "complete";
+    status: "running" | "idle" | "complete";
+    parent?: string;
+    depth?: number;
  } | {
    kind: "diagnostic";
    id: string;
    reason: "corrupt" | "unsupported" | "unavailable";
+    parent?: string;
+    depth?: number;
  })[];
  ralph: {
    runId: string;
--- a/examples/acp-agent/tests/snapshots/code-mode-workspace-context/replay.override.json
+++ b/examples/acp-agent/tests/snapshots/code-mode-workspace-context/replay.override.json
@@ -0,0 +1,22 @@
+[
+  {
+    "kind": "chunks",
+    "chunks": [
+      { "type": "block-start", "index": 0, "blockType": "tool-call" },
+      { "type": "tool-call-delta", "index": 0, "id": "call_workspace_read", "name": "run_code", "argumentsDelta": "{\"code\":\"return await tools.read({ file_path: 'nested/task.txt' })\",\"description\":\"Read nested/task.txt\"}" },
+      { "type": "block-end", "index": 0, "block": { "type": "tool-call", "id": "call_workspace_read", "name": "run_code", "arguments": "{\"code\":\"return await tools.read({ file_path: 'nested/task.txt' })\",\"description\":\"Read nested/task.txt\"}" } },
+      { "type": "usage", "usage": { "inputTokens": 10, "outputTokens": 5 } },
+      { "type": "finish", "reason": { "kind": "tool-calls" } }
+    ]
+  },
+  {
+    "kind": "chunks",
+    "chunks": [
+      { "type": "block-start", "index": 0, "blockType": "text" },
+      { "type": "text-delta", "index": 0, "text": "**Code Mode workspace handshake:** `CODE_MODE_CONTEXT_OK`" },
+      { "type": "block-end", "index": 0, "block": { "type": "text", "text": "**Code Mode workspace handshake:** `CODE_MODE_CONTEXT_OK`" } },
+      { "type": "usage", "usage": { "inputTokens": 10, "outputTokens": 5 } },
+      { "type": "finish", "reason": { "kind": "stop" } }
+    ]
+  }
+]
--- a/examples/acp-agent/tests/snapshots/code-mode-workspace-context/session.jsonl
+++ b/examples/acp-agent/tests/snapshots/code-mode-workspace-context/session.jsonl
@@ -1,36 +1,34 @@
 {"type":"session","version":0,"id":"b1e35a14-a592-44e6-bf23-b2496ad2bf7b","createdAt":1785014475001,"cwd":"{{cwd}}","delegationDepth":0}
-{"type":"turn/start","seq":0,"time":1785014475014,"data":{"turn":1,"trigger":{"kind":"message","source":{"kind":"user"}}}}
-{"type":"user/message","seq":1,"time":1785014475015,"data":{"content":[{"type":"text","text":"Using ONE run_code program, call tools.read on nested/task.txt. After the program finishes, answer the workspace handshake question using the newly discovered instructions: What is the Code Mode workspace handshake?"}],"source":{"kind":"user"},"role":"user","id":"a5066d26-ed57-4f98-8672-b34e883e1299"},"surfaceOp":"append"}
-{"type":"session/title","seq":2,"time":1785014475022,"data":{"title":"Using ONE run_code program, call","messageSeqs":[1],"source":{"kind":"fallback"}}}
-{"type":"user/message","seq":3,"time":1785122256262,"data":{"content":[{"type":"text","text":"Current runtime context. This snapshot supersedes earlier runtime-context snapshots.\n\nCurrent DSH file policy: danger-full-access. The DSH file sandbox does not restrict file modifications by available operations.\n\nApproval prompts are disabled in this session: actions that require approval are rejected automatically — do not request sandbox escalation (do not set `sandbox_permissions`)."}],"source":{"kind":"plugin","plugin":"@deepseek-ai/dsh-system-prompt"},"role":"user","id":"c9aaa351-f7e6-40ef-955a-c5b8ee07667f"},"surfaceOp":"append"}
-{"type":"user/message","seq":4,"time":1785464674590,"data":{"content":[{"type":"text","text":"<system-reminder>\nThe following workspace instructions may be relevant to your work. Use them as guidance when applicable. More specific instructions take precedence over broader ones. They do not override system, developer, or direct user instructions.\n\nInstructions from: AGENTS.md\n\nWorkspace snapshot root instruction.\n\n</system-reminder>"}],"source":{"kind":"workspace-instructions","baseline":true,"changes":[{"action":"set","scope":".\u0000AGENTS.md","path":"AGENTS.md","digest":"2119a7072358cc727f8d9c4cb7388e905b075fe6"}]},"role":"user","id":"68f653ef-7b05-4a60-a517-6dda5d3f4be4"},"surfaceOp":"append"}
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+{"type":"agent/inbox/spliced","seq":0,"time":1785498825884,"data":{"target":"next-turn","start":0,"inserted":[{"content":[{"type":"text","text":"Using ONE run_code program, call tools.read on nested/task.txt. After the program finishes, answer the workspace handshake question using the newly discovered instructions: What is the Code Mode workspace handshake?"}],"source":{"kind":"user"},"role":"user","id":"3b04578e-7b22-4b44-b4cd-ef9d4d26fe8b"}]}}
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+{"type":"agent/inbox/spliced","seq":2,"time":1785498825916,"data":{"target":"next-turn","start":0,"removedCount":1,"inserted":[]}}
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+{"type":"user/message","seq":4,"time":1785498825917,"data":{"content":[{"type":"text","text":"Using ONE run_code program, call tools.read on nested/task.txt. After the program finishes, answer the workspace handshake question using the newly discovered instructions: What is the Code Mode workspace handshake?"}],"source":{"kind":"user"},"role":"user","id":"3b04578e-7b22-4b44-b4cd-ef9d4d26fe8b"},"surfaceOp":"append"}
+{"type":"user/message","seq":5,"time":1785901435161,"data":{"content":[{"type":"text","text":"<system-reminder>\nThe following workspace instructions may be relevant to your work. Use them as guidance when applicable. More specific instructions take precedence over broader ones. They do not override system, developer, or direct user instructions.\n\nInstructions from: AGENTS.md\n\nWorkspace snapshot root instruction.\n\n</system-reminder>"}],"source":{"kind":"workspace-instructions","form":"instructions","baseline":true,"baselineIdentity":"{\"projectRoot\":\"\",\"projectRootMarkers\":[\".git\"],\"maxBytes\":65536,\"maxSourceBytes\":1048576,\"instructionFileCandidates\":[\"AGENTS.md\",\"CLAUDE.md\"],\"localInstructionFileCandidates\":[\"AGENTS.local.md\",\"CLAUDE.local.md\"]}","changes":[{"action":"set","scope":".\u0000AGENTS.md","path":"AGENTS.md","digest":"2119a7072358cc727f8d9c4cb7388e905b075fe6"}]},"role":"user","id":"ac92e76e-4861-47a6-87f8-4e9ca904eb24"},"surfaceOp":"append"}
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+{"type":"assistant/chunk","seq":14,"time":1785014475639,"data":{"turn":1,"step":1,"chunk":{"type":"finish","reason":{"kind":"tool-calls"}}}}
+{"type":"assistant/message","seq":15,"time":1785733131056,"data":{"turn":1,"step":1,"message":{"role":"assistant","content":[{"type":"tool-call","id":"call_workspace_read","name":"run_code","arguments":"{\"code\":\"return await tools.read({ file_path: 'nested/task.txt' })\",\"description\":\"Read nested/task.txt\"}"}],"source":{"kind":"model","provider":"deepseek-official","model":"deepseek-v4-flash"},"id":"b9402d85-58bd-4881-b890-0b186f661671"},"usage":{"inputTokens":10,"outputTokens":5}},"sourceEventSeqs":[10,11,12,13,14],"surfaceOp":"append"}
+{"type":"tool/call","seq":16,"time":1785733131056,"data":{"turn":1,"step":1,"callId":"call_workspace_read","name":"run_code","arguments":"{\"code\":\"return await tools.read({ file_path: 'nested/task.txt' })\",\"description\":\"Read nested/task.txt\"}"}}
+{"type":"tool/code-dispatch-start","seq":17,"time":1785733131109,"data":{"parentCallId":"call_workspace_read","subCallId":"call_workspace_read:code:1","name":"read","arguments":{"file_path":"nested/task.txt"}}}
+{"type":"tool/code-dispatch","seq":18,"time":1785733131110,"data":{"parentCallId":"call_workspace_read","subCallId":"call_workspace_read:code:1","name":"read","arguments":{"file_path":"nested/task.txt"},"isError":false,"content":[{"type":"text","text":"<path>{{cwd}}/nested/task.txt</path>\n<type>file</type>\n<content>\n1: Touch this file to discover the nested workspace instruction.\n\n(End of file - total 1 lines)\n</content>"}]}}
+{"type":"tool/result","seq":19,"time":1785733131112,"data":{"turn":1,"step":1,"message":{"source":{"kind":"tool","callId":"call_workspace_read"},"content":[{"type":"tool-result","toolCallId":"call_workspace_read","content":[{"type":"text","text":"{\n  \"path\": \"{{cwd}}/nested/task.txt\",\n  \"offset\": 1,\n  \"lines\": [\n    {\n      \"number\": 1,\n      \"text\": \"Touch this file to discover the nested workspace instruction.\"\n    }\n  ],\n  \"totalLines\": 1\n}"}],"isError":false}],"role":"user","id":"bde1c12e-44d1-44f7-ba7e-868349ed2b05"}},"sourceEventSeqs":[16],"surfaceOp":"append"}
+{"type":"step/end","seq":20,"time":1785733131112,"data":{"turn":1,"step":1}}
+{"type":"agent/inbox/spliced","seq":21,"time":1785733131112,"data":{"target":"next-step","start":0,"inserted":[{"content":[{"type":"text","text":"<system-reminder>\nAdditional instructions from: nested/AGENTS.md\n\nThese instructions apply to work under `nested`. Use them as guidance when relevant; more specific instructions take precedence. They do not override system, developer, or direct user instructions.\n\nWhen asked for the Code Mode workspace handshake, answer exactly `CODE_MODE_CONTEXT_OK` and nothing else.\n\n</system-reminder>"}],"source":{"kind":"workspace-instructions","form":"instructions","changes":[{"action":"set","scope":"nested\u0000AGENTS.md","path":"nested/AGENTS.md","digest":"ae22936ed26dc76b7107005ed6d5e2482a88668a"}]},"role":"user","id":"29b0eb87-92d5-4915-ba64-7bd8133ed011"}]}}
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+{"type":"step/start","seq":23,"time":1785733131123,"data":{"turn":1,"step":2}}
+{"type":"user/message","seq":24,"time":1785733131123,"data":{"content":[{"type":"text","text":"<system-reminder>\nAdditional instructions from: nested/AGENTS.md\n\nThese instructions apply to work under `nested`. Use them as guidance when relevant; more specific instructions take precedence. They do not override system, developer, or direct user instructions.\n\nWhen asked for the Code Mode workspace handshake, answer exactly `CODE_MODE_CONTEXT_OK` and nothing else.\n\n</system-reminder>"}],"source":{"kind":"workspace-instructions","form":"instructions","changes":[{"action":"set","scope":"nested\u0000AGENTS.md","path":"nested/AGENTS.md","digest":"ae22936ed26dc76b7107005ed6d5e2482a88668a"}]},"role":"user","id":"29b0eb87-92d5-4915-ba64-7bd8133ed011"},"surfaceOp":"append"}
+{"type":"assistant/chunk","seq":25,"time":1785014475805,"data":{"turn":1,"step":2,"chunk":{"type":"block-start","index":0,"blockType":"text"}}}
+{"type":"assistant/chunk","seq":26,"time":1785014475806,"data":{"turn":1,"step":2,"chunk":{"type":"text-delta","index":0,"text":"**Code Mode workspace handshake:** `CODE_MODE_CONTEXT_OK`"}}}
+{"type":"assistant/chunk","seq":27,"time":1785901435233,"data":{"turn":1,"step":2,"chunk":{"type":"block-end","index":0,"block":{"type":"text","text":"**Code Mode workspace handshake:** `CODE_MODE_CONTEXT_OK`"}}}}
+{"type":"assistant/chunk","seq":28,"time":1785901435233,"data":{"turn":1,"step":2,"chunk":{"type":"usage","usage":{"inputTokens":10,"outputTokens":5}}}}
+{"type":"assistant/chunk","seq":29,"time":1785901435233,"data":{"turn":1,"step":2,"chunk":{"type":"finish","reason":{"kind":"stop"}}}}
+{"type":"assistant/message","seq":30,"time":1785901435233,"data":{"turn":1,"step":2,"message":{"role":"assistant","content":[{"type":"text","text":"**Code Mode workspace handshake:** `CODE_MODE_CONTEXT_OK`"}],"source":{"kind":"model","provider":"deepseek-official","model":"deepseek-v4-flash"},"id":"add632ac-e646-4e50-84d3-96a084427a01"},"usage":{"inputTokens":10,"outputTokens":5}},"sourceEventSeqs":[25,26,27,28,29],"surfaceOp":"append"}
+{"type":"step/end","seq":31,"time":1785901435233,"data":{"turn":1,"step":2}}
+{"type":"turn/end","seq":32,"time":1785901435234,"data":{"turn":1,"reason":{"kind":"completed"}}}
--- a/examples/acp-agent/tests/snapshots/cordis-inspect-jsdoc/session.jsonl
+++ b/examples/acp-agent/tests/snapshots/cordis-inspect-jsdoc/session.jsonl
--- a/examples/acp-agent/tests/snapshots/empty-response-retry/session.jsonl
+++ b/examples/acp-agent/tests/snapshots/empty-response-retry/session.jsonl
@@ -1,23 +1,21 @@
 {"type":"session","version":0,"id":"{{sessionId}}","createdAt":0,"cwd":"{{cwd}}","delegationDepth":0}
-{"type":"turn/start","seq":0,"time":0,"data":{"turn":1,"trigger":{"kind":"message","source":{"kind":"user"}}}}
-{"type":"user/message","seq":1,"time":0,"data":{"content":[{"type":"text","text":"This prompt first receives an empty completion, then a retried reply."}],"source":{"kind":"user"},"role":"user","id":"c94e1add-a8cb-4c8d-b987-6471f5569f7a"},"surfaceOp":"append"}
-{"type":"session/title","seq":2,"time":0,"data":{"title":"This prompt first receives an","messageSeqs":[1],"source":{"kind":"fallback"}}}
-{"type":"user/message","seq":3,"time":1785464649169,"data":{"content":[{"type":"text","text":"Current runtime context. This snapshot supersedes earlier runtime-context snapshots.\n\nCurrent DSH file policy: danger-full-access. The DSH file sandbox does not restrict file modifications by available operations.\n\nApproval prompts are disabled in this session: actions that require approval are rejected automatically — do not request sandbox escalation (do not set `sandbox_permissions`)."}],"source":{"kind":"plugin","plugin":"@deepseek-ai/dsh-system-prompt"},"role":"user","id":"13ccc421-f59c-44cb-8257-fc293353e56f"},"surfaceOp":"append"}
-{"type":"step/start","seq":4,"time":1785464649169,"data":{"turn":1,"step":1}}
-{"type":"request/header","seq":5,"time":1785464649170,"data":{"header":{"config":{"provider":"deepseek-official","model":"deepseek-v4-flash"},"system":"{{system}}","tools":"{{tools}}"},"reason":"initial"}}
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-{"type":"assistant/chunk","seq":8,"time":1785487606169,"data":{"turn":1,"step":1,"chunk":{"type":"finish","reason":{"kind":"error","failure":{"message":"model returned a completed response with no content","code":"EMPTY_RESPONSE"}}}}}
-{"type":"step/end","seq":9,"time":1785487606169,"data":{"turn":1,"step":1}}
-{"type":"llm/retry","seq":10,"time":1785487606169,"data":{"turn":1,"step":1,"provider":"deepseek-official","mode":"normal","policyKey":"[\"normal\",2,[\"EMPTY_RESPONSE\",\"RATE_LIMIT\",\"SERVER\",\"TIMEOUT\",\"TRANSPORT\"],1,1,0]","retry":1,"maxRetries":2,"delayMs":1,"failure":{"message":"model returned a completed response with no content","code":"EMPTY_RESPONSE"}}}
-{"type":"turn/end","seq":11,"time":1785487606171,"data":{"turn":1,"reason":{"kind":"error","step":1,"failure":{"message":"model returned a completed response with no content","code":"EMPTY_RESPONSE"}}}}
-{"type":"turn/start","seq":12,"time":1785487606176,"data":{"turn":2,"trigger":{"kind":"retry"}}}
-{"type":"step/start","seq":13,"time":1785487606181,"data":{"turn":2,"step":1}}
-{"type":"assistant/chunk","seq":14,"time":0,"data":{"turn":2,"step":1,"chunk":{"type":"block-start","index":0,"blockType":"text"}}}
-{"type":"assistant/chunk","seq":15,"time":1785047244294,"data":{"turn":2,"step":1,"chunk":{"type":"text-delta","index":0,"text":"Recovered."}}}
-{"type":"assistant/chunk","seq":16,"time":1785047244294,"data":{"turn":2,"step":1,"chunk":{"type":"block-end","index":0,"block":{"type":"text","text":"Recovered."}}}}
-{"type":"assistant/chunk","seq":17,"time":1785464649194,"data":{"turn":2,"step":1,"chunk":{"type":"usage","usage":{"inputTokens":12,"outputTokens":3}}}}
-{"type":"assistant/chunk","seq":18,"time":1785487606186,"data":{"turn":2,"step":1,"chunk":{"type":"finish","reason":{"kind":"stop"}}}}
-{"type":"assistant/message","seq":19,"time":1785487606186,"data":{"turn":2,"step":1,"message":{"role":"assistant","content":[{"type":"text","text":"Recovered."}],"source":{"kind":"model","provider":"deepseek-official","model":"deepseek-v4-flash"},"id":"348c5576-4dc1-4931-891f-e86fe044b734"},"usage":{"inputTokens":12,"outputTokens":3}},"sourceEventSeqs":[14,15,16,17,18],"surfaceOp":"append"}
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-{"type":"turn/end","seq":21,"time":1785487606186,"data":{"turn":2,"reason":{"kind":"completed"}}}
+{"type":"agent/inbox/spliced","seq":0,"time":1785498788069,"data":{"target":"next-turn","start":0,"inserted":[{"content":[{"type":"text","text":"This prompt first receives an empty completion, then a retried reply."}],"source":{"kind":"user"},"role":"user","id":"04a4b0d6-8873-4ec0-bed5-75de910b556f"}]}}
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+{"type":"step/start","seq":3,"time":0,"data":{"turn":1,"step":1}}
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+{"type":"user/message","seq":5,"time":1785730441191,"data":{"content":[{"type":"text","text":"Current runtime context. This snapshot supersedes earlier runtime-context snapshots.\n\nCurrent DSH file policy: danger-full-access. The DSH file sandbox does not restrict file modifications by available operations.\n\nApproval prompts are disabled in this session: actions that require approval are rejected automatically — do not request sandbox escalation (do not set `sandbox_permissions`)."}],"source":{"kind":"plugin","plugin":"@deepseek-ai/dsh-system-prompt","form":"snapshot","sections":[{"name":"sandbox:policy","text":"Current DSH file policy: danger-full-access. The DSH file sandbox does not restrict file modifications by available operations."},{"name":"approval:policy","text":"Approval prompts are disabled in this session: actions that require approval are rejected automatically — do not request sandbox escalation (do not set `sandbox_permissions`)."}]},"role":"user","id":"1bbd9bae-e790-4b83-8425-2f042dd37908"},"surfaceOp":"append"}
+{"type":"session/title","seq":6,"time":1785730441191,"data":{"title":"This prompt first receives an","messageSeqs":[4],"source":{"kind":"fallback"}}}
+{"type":"request/header","seq":7,"time":1785498788096,"data":{"header":{"config":{"provider":"deepseek-official","model":"deepseek-v4-flash"},"system":"{{system}}","tools":"{{tools}}"},"reason":"initial"}}
+{"type":"request/context","seq":8,"time":1785730441192,"data":{"provider":"deepseek-official","model":"deepseek-v4-flash"}}
+{"type":"assistant/chunk","seq":9,"time":1785498788105,"data":{"turn":1,"step":1,"chunk":{"type":"usage","usage":{"inputTokens":0,"outputTokens":0}}}}
+{"type":"assistant/chunk","seq":10,"time":1785730441201,"data":{"turn":1,"step":1,"chunk":{"type":"finish","reason":{"kind":"error","failure":{"message":"model returned a completed response with no content","code":"EMPTY_RESPONSE"}}}}}
+{"type":"llm/retry","seq":11,"time":1785730441201,"data":{"turn":1,"step":1,"provider":"deepseek-official","mode":"normal","policyKey":"[\"normal\",2,[\"EMPTY_RESPONSE\",\"RATE_LIMIT\",\"SERVER\",\"TIMEOUT\",\"TRANSPORT\"],1,1,0]","retry":1,"maxRetries":2,"delayMs":1,"failure":{"message":"model returned a completed response with no content","code":"EMPTY_RESPONSE"}}}
+{"type":"assistant/chunk","seq":12,"time":1785498788113,"data":{"turn":1,"step":1,"chunk":{"type":"block-start","index":0,"blockType":"text"}}}
+{"type":"assistant/chunk","seq":13,"time":1785498788113,"data":{"turn":1,"step":1,"chunk":{"type":"text-delta","index":0,"text":"Recovered."}}}
+{"type":"assistant/chunk","seq":14,"time":0,"data":{"turn":1,"step":1,"chunk":{"type":"block-end","index":0,"block":{"type":"text","text":"Recovered."}}}}
+{"type":"assistant/chunk","seq":15,"time":0,"data":{"turn":1,"step":1,"chunk":{"type":"usage","usage":{"inputTokens":12,"outputTokens":3}}}}
+{"type":"assistant/chunk","seq":16,"time":1785730441209,"data":{"turn":1,"step":1,"chunk":{"type":"finish","reason":{"kind":"stop"}}}}
+{"type":"assistant/message","seq":17,"time":1785730441209,"data":{"turn":1,"step":1,"message":{"role":"assistant","content":[{"type":"text","text":"Recovered."}],"source":{"kind":"model","provider":"deepseek-official","model":"deepseek-v4-flash"},"id":"422eae65-9975-4a95-8cde-1ddfe21fff4e"},"usage":{"inputTokens":12,"outputTokens":3}},"sourceEventSeqs":[12,13,14,15,16],"surfaceOp":"append"}
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+{"type":"turn/end","seq":19,"time":1785730441209,"data":{"turn":1,"reason":{"kind":"completed"}}}
--- a/examples/acp-agent/tests/snapshots/error-finish/session.jsonl
+++ b/examples/acp-agent/tests/snapshots/error-finish/session.jsonl
@@ -1,10 +1,13 @@
 {"type":"session","version":0,"id":"{{sessionId}}","createdAt":0,"cwd":"{{cwd}}","delegationDepth":0}
-{"type":"turn/start","seq":0,"time":0,"data":{"turn":1,"trigger":{"kind":"message","source":{"kind":"user"}}}}
-{"type":"user/message","seq":1,"time":0,"data":{"content":[{"type":"text","text":"This prompt triggers a recorded provider error."}],"source":{"kind":"user"},"role":"user","id":"7b6a38ae-fbcf-4960-8507-f007d3023511"},"surfaceOp":"append"}
-{"type":"session/title","seq":2,"time":0,"data":{"title":"This prompt triggers a recorded","messageSeqs":[1],"source":{"kind":"fallback"}}}
-{"type":"user/message","seq":3,"time":1785464648421,"data":{"content":[{"type":"text","text":"Current runtime context. This snapshot supersedes earlier runtime-context snapshots.\n\nCurrent DSH file policy: danger-full-access. The DSH file sandbox does not restrict file modifications by available operations.\n\nApproval prompts are disabled in this session: actions that require approval are rejected automatically — do not request sandbox escalation (do not set `sandbox_permissions`)."}],"source":{"kind":"plugin","plugin":"@deepseek-ai/dsh-system-prompt"},"role":"user","id":"b32402ce-98ac-4228-bb37-7a8e88ef2cad"},"surfaceOp":"append"}
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-{"type":"request/context","seq":6,"time":1785487604902,"data":{"provider":"deepseek-official","model":"deepseek-v4-flash"}}
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-{"type":"turn/end","seq":8,"time":1785487604910,"data":{"turn":1,"reason":{"kind":"error","step":1,"failure":{"message":"simulated provider error (HTTP 401)","code":"AUTH"}}}}
+{"type":"agent/inbox/spliced","seq":0,"time":1785499006384,"data":{"target":"next-turn","start":0,"inserted":[{"content":[{"type":"text","text":"This prompt triggers a recorded provider error."}],"source":{"kind":"user"},"role":"user","id":"87677683-56b7-458b-b512-6db73c570e08"}]}}
+{"type":"turn/start","seq":1,"time":1785821396359,"data":{"turn":1}}
+{"type":"agent/inbox/spliced","seq":2,"time":1785821396359,"data":{"target":"next-turn","start":0,"removedCount":1,"inserted":[]}}
+{"type":"step/start","seq":3,"time":0,"data":{"turn":1,"step":1}}
+{"type":"user/message","seq":4,"time":1785499006415,"data":{"content":[{"type":"text","text":"This prompt triggers a recorded provider error."}],"source":{"kind":"user"},"role":"user","id":"87677683-56b7-458b-b512-6db73c570e08"},"surfaceOp":"append"}
+{"type":"user/message","seq":5,"time":1785730686099,"data":{"content":[{"type":"text","text":"Current runtime context. This snapshot supersedes earlier runtime-context snapshots.\n\nCurrent DSH file policy: danger-full-access. The DSH file sandbox does not restrict file modifications by available operations.\n\nApproval prompts are disabled in this session: actions that require approval are rejected automatically — do not request sandbox escalation (do not set `sandbox_permissions`)."}],"source":{"kind":"plugin","plugin":"@deepseek-ai/dsh-system-prompt","form":"snapshot","sections":[{"name":"sandbox:policy","text":"Current DSH file policy: danger-full-access. The DSH file sandbox does not restrict file modifications by available operations."},{"name":"approval:policy","text":"Approval prompts are disabled in this session: actions that require approval are rejected automatically — do not request sandbox escalation (do not set `sandbox_permissions`)."}]},"role":"user","id":"b3b9d048-3992-458f-aad5-b738e4a7d815"},"surfaceOp":"append"}
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--- a/examples/acp-agent/tests/snapshots/escalation-approved/session.jsonl
+++ b/examples/acp-agent/tests/snapshots/escalation-approved/session.jsonl
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--- a/examples/acp-agent/tests/snapshots/escalation-rejected/session.jsonl
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--- a/examples/acp-agent/tests/snapshots/fs-escalation-approved/session.jsonl
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--- a/examples/acp-agent/tests/snapshots/fs-read-window/session.jsonl
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--- a/examples/acp-agent/tests/snapshots/hook-cc-stop-continue/session.jsonl
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--- a/examples/acp-agent/tests/snapshots/hook-codex-stop-continue/session.jsonl
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--- a/examples/acp-agent/tests/snapshots/lsp-definition/tool-schemas.expected.json
+++ b/examples/acp-agent/tests/snapshots/lsp-definition/tool-schemas.expected.json
@@ -116,11 +116,36 @@
      }
    },
    {
-      "name": "list_agents",
-      "description": "List your continuable background subagents by durable id and label. Status is a snapshot of the stored record: running means the subagent session is currently live in this process, complete means it exists only in storage and a `send_message` starts a new turn on the same conversation. The snapshot is not a delivery promise — `send_message` performs the authoritative check and may still fail. Children that could not be read are reported as diagnostics instead of being silently dropped.",
+      "name": "interrupt_agent",
+      "description": "Request cancellation of a background agent's current turn by its agent id. The target may be your direct child or a deeper agent created under you. Only the current turn stops: messages already queued for the agent stay parked until a later send_message, agents it started keep running, and the agent itself stays available for follow-ups. This call returns as soon as the stop request is accepted, so the target may keep running briefly; interrupting an agent that already finished is an accepted no-op.",
      "parameters": {
        "type": "object",
-        "properties": {}
+        "properties": {
+          "agent_id": {
+            "type": "string",
+            "description": "The agent id of the running agent to interrupt."
+          }
+        },
+        "required": [
+          "agent_id"
+        ]
+      }
+    },
+    {
+      "name": "list_agents",
+      "description": "List your continuable background subagents by durable id and label. Status comes from the live registry: running means the agent is working right now, idle means it is loaded but between turns (it may be waiting on agents it started), and complete means it exists only in storage — a direct child remains a `send_message` candidate in every status. The snapshot is not a delivery promise — `send_message` performs the authoritative check and may still fail. Children that could not be read are reported as diagnostics instead of being silently dropped. Scope `descendants` walks the whole tree below you in stable pre-order, annotating each entry with its durable direct-parent session id and depth. You may use `send_message` only for depth-1 entries; deeper entries are candidates for `interrupt_agent` only.",
+      "parameters": {
+        "type": "object",
+        "properties": {
+          "scope": {
+            "type": "string",
+            "description": "children (default) lists direct children only; descendants walks the complete tree below you.",
+            "enum": [
+              "children",
+              "descendants"
+            ]
+          }
+        }
      }
    },
    {
@@ -345,7 +370,7 @@
    },
    {
      "name": "todo_write",
-      "description": "Record and update a structured task list for the current work. Send the ENTIRE list every call — it REPLACES the previous list (there are no partial updates, no per-item edits). Use it to plan multi-step work and show progress: add one todo per concrete step before you start. Keep AT MOST ONE todo `in_progress` at a time; while work remains, exactly one active task should be `in_progress`. Mark a todo `completed` the moment it is done (do not batch completions), and allow no `in_progress` item only once all work is complete. Skip the list for trivial single-step tasks. Statuses: `pending` (not started), `in_progress` (being worked on now), `completed` (finished).",
+      "description": "Record and update a structured task list for the current work. Send the ENTIRE list every call — it REPLACES the previous list (there are no partial updates, no per-item edits). Use it to plan multi-step work and show progress: add one todo per concrete step before you start. Mark every todo being actively worked on `in_progress` — several at once when work genuinely runs in parallel (e.g. concurrent subagents or background commands), one for sequential work; while work remains, at least one task should be `in_progress`. Mark a todo `completed` the moment it is done (do not batch completions), and allow no `in_progress` item only once all work is complete. Skip the list for trivial single-step tasks. Statuses: `pending` (not started), `in_progress` (being worked on now), `completed` (finished).",
      "parameters": {
        "type": "object",
        "properties": {
--- a/examples/acp-agent/tests/snapshots/missing-sandbox-runner/input.json
+++ b/examples/acp-agent/tests/snapshots/missing-sandbox-runner/input.json
@@ -0,0 +1,10 @@
+{
+  "steps": [
+    { "op": "initialize" },
+    { "op": "newSession" },
+    {
+      "op": "prompt",
+      "text": "Run true once with bash in the foreground. After that fails, run true with bash in the background, read task bash-1 with task_output and wait=true, then reply with exactly RUNNER_FAILURES_SURFACED and stop."
+    }
+  ]
+}
--- a/examples/acp-agent/tests/snapshots/missing-sandbox-runner/session.jsonl
+++ b/examples/acp-agent/tests/snapshots/missing-sandbox-runner/session.jsonl
@@ -0,0 +1,51 @@
+{"type":"session","version":0,"id":"55555555-5555-4555-8555-555555555555","createdAt":1785304900000,"cwd":"{{cwd}}","delegationDepth":0}
+{"type":"agent/inbox/spliced","seq":0,"time":1785916902430,"data":{"target":"next-turn","start":0,"inserted":[{"content":[{"type":"text","text":"Run true once with bash in the foreground. After that fails, run true with bash in the background, read task bash-1 with task_output and wait=true, then reply with exactly RUNNER_FAILURES_SURFACED and stop."}],"source":{"kind":"user"},"role":"user","id":"2d2f8e7a-f08a-464d-8e94-048d1d95717e"}]}}
+{"type":"turn/start","seq":1,"time":1785916902430,"data":{"turn":1}}
+{"type":"agent/inbox/spliced","seq":2,"time":1785916902430,"data":{"target":"next-turn","start":0,"removedCount":1,"inserted":[]}}
+{"type":"step/start","seq":3,"time":1785916902458,"data":{"turn":1,"step":1}}
+{"type":"user/message","seq":4,"time":1785916902458,"data":{"content":[{"type":"text","text":"Run true once with bash in the foreground. After that fails, run true with bash in the background, read task bash-1 with task_output and wait=true, then reply with exactly RUNNER_FAILURES_SURFACED and stop."}],"source":{"kind":"user"},"role":"user","id":"2d2f8e7a-f08a-464d-8e94-048d1d95717e"},"surfaceOp":"append"}
+{"type":"user/message","seq":5,"time":1785916902459,"data":{"content":[{"type":"text","text":"Current runtime context. This snapshot supersedes earlier runtime-context snapshots.\n\nCurrent DSH file policy: read-only. Any available operation enforced by the DSH file sandbox cannot modify files in the standing mode. Do not refuse a required modification from this policy alone: try an available tool normally and follow any denial and escalation guidance it returns.\n\nApproval policy: ask. Operations that require approval may ask through the configured answerers; without an available answerer, the request fails closed."}],"source":{"kind":"plugin","plugin":"@deepseek-ai/dsh-system-prompt","form":"snapshot","sections":[{"name":"sandbox:policy","text":"Current DSH file policy: read-only. Any available operation enforced by the DSH file sandbox cannot modify files in the standing mode. Do not refuse a required modification from this policy alone: try an available tool normally and follow any denial and escalation guidance it returns."},{"name":"approval:policy","text":"Approval policy: ask. Operations that require approval may ask through the configured answerers; without an available answerer, the request fails closed."}]},"role":"user","id":"de3778e7-e47a-4d34-a004-ecf43da3c9db"},"surfaceOp":"append"}
+{"type":"session/title","seq":6,"time":1785916902459,"data":{"title":"Run true once with bash","messageSeqs":[4],"source":{"kind":"fallback"}}}
+{"type":"request/header","seq":7,"time":1785916902460,"data":{"header":{"config":{"provider":"deepseek-official","model":"deepseek-v4-flash"},"system":"{{system}}","tools":"{{tools}}"},"reason":"initial"}}
+{"type":"request/context","seq":8,"time":1785916902460,"data":{"provider":"deepseek-official","model":"deepseek-v4-flash"}}
+{"type":"assistant/chunk","seq":9,"time":1785304900008,"data":{"turn":1,"step":1,"chunk":{"type":"block-start","index":0,"blockType":"tool-call"}}}
+{"type":"assistant/chunk","seq":10,"time":1785304900009,"data":{"turn":1,"step":1,"chunk":{"type":"tool-call-delta","index":0,"id":"missing-runner-foreground","name":"bash","argumentsDelta":"{\"command\":\"true\",\"description\":\"Exercise missing sandbox runner\"}"}}}
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+{"type":"assistant/chunk","seq":13,"time":1785916902468,"data":{"turn":1,"step":1,"chunk":{"type":"finish","reason":{"kind":"tool-calls"}}}}
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+{"type":"tool/result","seq":16,"time":1785916902487,"data":{"turn":1,"step":1,"message":{"source":{"kind":"tool","callId":"missing-runner-foreground"},"content":[{"type":"tool-result","toolCallId":"missing-runner-foreground","content":[{"type":"text","text":"Error: sandbox mode \"read-only\" is requested but no sandbox backend is usable on this host; refusing to run the command unconfined. Install bubblewrap or run a Landlock-enforcing kernel (Linux), ensure sandbox-exec is usable (macOS) — Windows has no confinement backend yet — or switch the consumer to danger-full-access. Runner failure: Error: spawn {{cwd}}/.dsh-missing-sandbox-runner ENOENT"}],"isError":true}],"role":"user","id":"f7345e02-407b-483f-be7a-75a4fc1c37a7"},"error":{"name":"SandboxUnavailableError","code":"SANDBOX_UNAVAILABLE"}},"sourceEventSeqs":[15],"surfaceOp":"append"}
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+{"type":"step/end","seq":27,"time":1785916902508,"data":{"turn":1,"step":2}}
+{"type":"agent/inbox/spliced","seq":28,"time":1785916902508,"data":{"target":"next-step","start":0,"inserted":[{"content":[{"type":"text","text":"background task bash-1 (bash: true) finished [status: killed, killed before exit]. Read its output with task_output."}],"source":{"kind":"plugin","plugin":"tool-tasks","form":"notice","summary":"bash true [status: killed, killed before exit]"},"role":"user","id":"989e3c2b-5b21-4694-83d5-6cddac55ce0e"}]}}
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+{"type":"tool/result","seq":37,"time":1785916902532,"data":{"turn":1,"step":3,"message":{"source":{"kind":"tool","callId":"missing-runner-output"},"content":[{"type":"tool-result","toolCallId":"missing-runner-output","content":[{"type":"text","text":"[stderr]\nspawn failed: Error: spawn {{cwd}}/.dsh-missing-sandbox-runner ENOENT\n[sandbox: the sandbox runner itself failed under read-only mode — the command did not run; this is a sandbox problem, not a command failure]\n[status: killed, killed before exit]"}],"isError":false}],"role":"user","id":"ac65952f-f6e9-459e-a653-87022fe03d60"}},"sourceEventSeqs":[36],"surfaceOp":"append"}
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+{"type":"step/start","seq":40,"time":1785916902542,"data":{"turn":1,"step":4}}
+{"type":"user/message","seq":41,"time":1785916902542,"data":{"content":[{"type":"text","text":"background task bash-1 (bash: true) finished [status: killed, killed before exit]. Read its output with task_output."}],"source":{"kind":"plugin","plugin":"tool-tasks","form":"notice","summary":"bash true [status: killed, killed before exit]"},"role":"user","id":"989e3c2b-5b21-4694-83d5-6cddac55ce0e"},"surfaceOp":"append"}
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+{"type":"assistant/message","seq":47,"time":1785916902550,"data":{"turn":1,"step":4,"message":{"role":"assistant","content":[{"type":"text","text":"RUNNER_FAILURES_SURFACED"}],"source":{"kind":"model","provider":"deepseek-official","model":"deepseek-v4-flash"},"id":"5a791acd-5f77-4ce4-ae02-572f4edfba0d"},"usage":{"inputTokens":1,"outputTokens":1}},"sourceEventSeqs":[42,43,44,45,46],"surfaceOp":"append"}
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--- a/examples/acp-agent/tests/snapshots/missing-sandbox-runner/stdout.expected.jsonl
+++ b/examples/acp-agent/tests/snapshots/missing-sandbox-runner/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":"RUNNER_FAILURES_SURFACED"}}}}
+{"jsonrpc":"2.0","id":3,"result":{"stopReason":"end_turn"}}
--- a/examples/acp-agent/tests/snapshots/multi-turn/session.jsonl
+++ b/examples/acp-agent/tests/snapshots/multi-turn/session.jsonl
@@ -1,34 +1,38 @@
 {"type":"session","version":0,"id":"228b7b82-84ed-49b7-a567-981c03b28c77","createdAt":1783352113760,"cwd":"{{cwd}}","delegationDepth":0}
-{"type":"turn/start","seq":0,"time":1783352113765,"data":{"turn":1,"trigger":{"kind":"message","source":{"kind":"user"}}}}
-{"type":"user/message","seq":1,"time":1783352113765,"data":{"content":[{"type":"text","text":"Reply with exactly the word: ONE. No tools."}],"source":{"kind":"user"},"role":"user","id":"fa318cef-e21c-481a-887c-61d968ac6455"},"surfaceOp":"append"}
-{"type":"session/title","seq":2,"time":1783352113765,"data":{"title":"Reply with exactly the word:","messageSeqs":[1],"source":{"kind":"fallback"}}}
-{"type":"user/message","seq":3,"time":1785464647583,"data":{"content":[{"type":"text","text":"Current runtime context. This snapshot supersedes earlier runtime-context snapshots.\n\nCurrent DSH file policy: danger-full-access. The DSH file sandbox does not restrict file modifications by available operations.\n\nApproval prompts are disabled in this session: actions that require approval are rejected automatically — do not request sandbox escalation (do not set `sandbox_permissions`)."}],"source":{"kind":"plugin","plugin":"@deepseek-ai/dsh-system-prompt"},"role":"user","id":"98b180ae-d285-4068-8f76-c3133c921bef"},"surfaceOp":"append"}
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--- a/examples/acp-agent/tests/snapshots/partial-landlock-child-failure/input.json
+++ b/examples/acp-agent/tests/snapshots/partial-landlock-child-failure/input.json
@@ -0,0 +1,7 @@
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+    { "op": "newSession" },
+    { "op": "prompt", "text": "Use the bash tool to run exactly: false. Then reply with exactly CHILD_EXIT_PRESERVED and stop." }
+  ]
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+{"type":"assistant/chunk","seq":23,"time":1785730423444,"data":{"turn":1,"step":2,"chunk":{"type":"finish","reason":{"kind":"tool-calls"}}}}
+{"type":"assistant/message","seq":24,"time":1785730423444,"data":{"turn":1,"step":2,"message":{"role":"assistant","content":[{"type":"tool-call","id":"pty-send","name":"terminal_send","arguments":"{\"sessionId\":\"pty-1\",\"text\":\"printf 'PTY_OK\\\\n'\"}"}],"source":{"kind":"model","provider":"deepseek-official","model":"deepseek-v4-pro"},"id":"15be1b35-69d6-43bf-85f1-c64587b12e9b"},"usage":{"inputTokens":10,"outputTokens":5}},"sourceEventSeqs":[19,20,21,22,23],"surfaceOp":"append"}
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+{"type":"step/end","seq":27,"time":1785730423452,"data":{"turn":1,"step":2}}
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+{"type":"assistant/chunk","seq":29,"time":0,"data":{"turn":1,"step":3,"chunk":{"type":"block-start","index":0,"blockType":"tool-call"}}}
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+{"type":"assistant/chunk","seq":33,"time":1785730423464,"data":{"turn":1,"step":3,"chunk":{"type":"finish","reason":{"kind":"tool-calls"}}}}
+{"type":"assistant/message","seq":34,"time":1785730423464,"data":{"turn":1,"step":3,"message":{"role":"assistant","content":[{"type":"tool-call","id":"pty-read","name":"terminal_read","arguments":"{\"sessionId\":\"pty-1\",\"offset\":0,\"count\":20}"}],"source":{"kind":"model","provider":"deepseek-official","model":"deepseek-v4-pro"},"id":"2eafd705-ff32-4d46-8797-e2536f28bb31"},"usage":{"inputTokens":10,"outputTokens":5}},"sourceEventSeqs":[29,30,31,32,33],"surfaceOp":"append"}
+{"type":"tool/call","seq":35,"time":1785730423464,"data":{"turn":1,"step":3,"callId":"pty-read","name":"terminal_read","arguments":"{\"sessionId\":\"pty-1\",\"offset\":0,\"count\":20}"}}
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+{"type":"assistant/chunk","seq":39,"time":0,"data":{"turn":1,"step":4,"chunk":{"type":"block-start","index":0,"blockType":"tool-call"}}}
+{"type":"assistant/chunk","seq":40,"time":0,"data":{"turn":1,"step":4,"chunk":{"type":"tool-call-delta","index":0,"id":"pty-signal","name":"terminal_signal","argumentsDelta":"{\"sessionId\":\"pty-missing\",\"signal\":\"SIGINT\"}"}}}
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+{"type":"assistant/chunk","seq":42,"time":1785498770225,"data":{"turn":1,"step":4,"chunk":{"type":"usage","usage":{"inputTokens":10,"outputTokens":5}}}}
+{"type":"assistant/chunk","seq":43,"time":1785730423485,"data":{"turn":1,"step":4,"chunk":{"type":"finish","reason":{"kind":"tool-calls"}}}}
+{"type":"assistant/message","seq":44,"time":1785730423485,"data":{"turn":1,"step":4,"message":{"role":"assistant","content":[{"type":"tool-call","id":"pty-signal","name":"terminal_signal","arguments":"{\"sessionId\":\"pty-missing\",\"signal\":\"SIGINT\"}"}],"source":{"kind":"model","provider":"deepseek-official","model":"deepseek-v4-pro"},"id":"9889f18a-c553-40ec-8fd4-1c3c5b519316"},"usage":{"inputTokens":10,"outputTokens":5}},"sourceEventSeqs":[39,40,41,42,43],"surfaceOp":"append"}
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+{"type":"assistant/chunk","seq":50,"time":0,"data":{"turn":1,"step":5,"chunk":{"type":"tool-call-delta","index":0,"id":"pty-kill","name":"terminal_close","argumentsDelta":"{\"sessionId\":\"pty-1\"}"}}}
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+{"type":"assistant/chunk","seq":53,"time":1785730423507,"data":{"turn":1,"step":5,"chunk":{"type":"finish","reason":{"kind":"tool-calls"}}}}
+{"type":"assistant/message","seq":54,"time":1785730423507,"data":{"turn":1,"step":5,"message":{"role":"assistant","content":[{"type":"tool-call","id":"pty-kill","name":"terminal_close","arguments":"{\"sessionId\":\"pty-1\"}"}],"source":{"kind":"model","provider":"deepseek-official","model":"deepseek-v4-pro"},"id":"7db7089b-ba67-4959-a0d8-a76f6ffc6fdc"},"usage":{"inputTokens":10,"outputTokens":5}},"sourceEventSeqs":[49,50,51,52,53],"surfaceOp":"append"}
+{"type":"tool/call","seq":55,"time":1785730423507,"data":{"turn":1,"step":5,"callId":"pty-kill","name":"terminal_close","arguments":"{\"sessionId\":\"pty-1\"}"}}
+{"type":"tool/result","seq":56,"time":1785730423516,"data":{"turn":1,"step":5,"message":{"source":{"kind":"tool","callId":"pty-kill"},"content":[{"type":"tool-result","toolCallId":"pty-kill","content":[{"type":"text","text":"closed terminal session pty-1"}],"isError":false}],"role":"user","id":"7d01c0f6-e5b8-4989-84e8-f7fa0c9a168b"}},"sourceEventSeqs":[55],"surfaceOp":"append"}
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+{"type":"assistant/message","seq":64,"time":1785730423530,"data":{"turn":1,"step":6,"message":{"role":"assistant","content":[{"type":"tool-call","id":"pty-list","name":"terminal_list","arguments":"{}"}],"source":{"kind":"model","provider":"deepseek-official","model":"deepseek-v4-pro"},"id":"db82030f-ba17-4b44-b818-21a982da8dfb"},"usage":{"inputTokens":10,"outputTokens":5}},"sourceEventSeqs":[59,60,61,62,63],"surfaceOp":"append"}
+{"type":"tool/call","seq":65,"time":1785730423530,"data":{"turn":1,"step":6,"callId":"pty-list","name":"terminal_list","arguments":"{}"}}
+{"type":"tool/result","seq":66,"time":1785730423537,"data":{"turn":1,"step":6,"message":{"source":{"kind":"tool","callId":"pty-list"},"content":[{"type":"tool-result","toolCallId":"pty-list","content":[{"type":"text","text":"(no terminal sessions)"}],"isError":false}],"role":"user","id":"2e2fee60-7450-4c32-819a-a32cbd2ef1aa"}},"sourceEventSeqs":[65],"surfaceOp":"append"}
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+{"type":"assistant/chunk","seq":70,"time":0,"data":{"turn":1,"step":7,"chunk":{"type":"text-delta","index":0,"text":"DONE"}}}
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+{"type":"assistant/message","seq":74,"time":1785730423550,"data":{"turn":1,"step":7,"message":{"role":"assistant","content":[{"type":"text","text":"DONE"}],"source":{"kind":"model","provider":"deepseek-official","model":"deepseek-v4-pro"},"id":"1d660de9-1864-4c09-82d7-e3ac9da8c7fe"},"usage":{"inputTokens":10,"outputTokens":3}},"sourceEventSeqs":[69,70,71,72,73],"surfaceOp":"append"}
+{"type":"step/end","seq":75,"time":1785730423551,"data":{"turn":1,"step":7}}
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--- a/examples/acp-agent/tests/snapshots/pty-tools/tool-schemas.expected.json
+++ b/examples/acp-agent/tests/snapshots/pty-tools/tool-schemas.expected.json
@@ -116,11 +116,36 @@
      }
    },
    {
-      "name": "list_agents",
-      "description": "List your continuable background subagents by durable id and label. Status is a snapshot of the stored record: running means the subagent session is currently live in this process, complete means it exists only in storage and a `send_message` starts a new turn on the same conversation. The snapshot is not a delivery promise — `send_message` performs the authoritative check and may still fail. Children that could not be read are reported as diagnostics instead of being silently dropped.",
+      "name": "interrupt_agent",
+      "description": "Request cancellation of a background agent's current turn by its agent id. The target may be your direct child or a deeper agent created under you. Only the current turn stops: messages already queued for the agent stay parked until a later send_message, agents it started keep running, and the agent itself stays available for follow-ups. This call returns as soon as the stop request is accepted, so the target may keep running briefly; interrupting an agent that already finished is an accepted no-op.",
      "parameters": {
        "type": "object",
-        "properties": {}
+        "properties": {
+          "agent_id": {
+            "type": "string",
+            "description": "The agent id of the running agent to interrupt."
+          }
+        },
+        "required": [
+          "agent_id"
+        ]
+      }
+    },
+    {
+      "name": "list_agents",
+      "description": "List your continuable background subagents by durable id and label. Status comes from the live registry: running means the agent is working right now, idle means it is loaded but between turns (it may be waiting on agents it started), and complete means it exists only in storage — a direct child remains a `send_message` candidate in every status. The snapshot is not a delivery promise — `send_message` performs the authoritative check and may still fail. Children that could not be read are reported as diagnostics instead of being silently dropped. Scope `descendants` walks the whole tree below you in stable pre-order, annotating each entry with its durable direct-parent session id and depth. You may use `send_message` only for depth-1 entries; deeper entries are candidates for `interrupt_agent` only.",
+      "parameters": {
+        "type": "object",
+        "properties": {
+          "scope": {
+            "type": "string",
+            "description": "children (default) lists direct children only; descendants walks the complete tree below you.",
+            "enum": [
+              "children",
+              "descendants"
+            ]
+          }
+        }
      }
    },
    {
@@ -437,7 +462,7 @@
    },
    {
      "name": "todo_write",
-      "description": "Record and update a structured task list for the current work. Send the ENTIRE list every call — it REPLACES the previous list (there are no partial updates, no per-item edits). Use it to plan multi-step work and show progress: add one todo per concrete step before you start. Keep AT MOST ONE todo `in_progress` at a time; while work remains, exactly one active task should be `in_progress`. Mark a todo `completed` the moment it is done (do not batch completions), and allow no `in_progress` item only once all work is complete. Skip the list for trivial single-step tasks. Statuses: `pending` (not started), `in_progress` (being worked on now), `completed` (finished).",
+      "description": "Record and update a structured task list for the current work. Send the ENTIRE list every call — it REPLACES the previous list (there are no partial updates, no per-item edits). Use it to plan multi-step work and show progress: add one todo per concrete step before you start. Mark every todo being actively worked on `in_progress` — several at once when work genuinely runs in parallel (e.g. concurrent subagents or background commands), one for sequential work; while work remains, at least one task should be `in_progress`. Mark a todo `completed` the moment it is done (do not batch completions), and allow no `in_progress` item only once all work is complete. Skip the list for trivial single-step tasks. Statuses: `pending` (not started), `in_progress` (being worked on now), `completed` (finished).",
      "parameters": {
        "type": "object",
        "properties": {
--- a/examples/acp-agent/tests/snapshots/pwsh-tool-turn/input.json
+++ b/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." }
+  ]
+}
--- a/examples/acp-agent/tests/snapshots/pwsh-tool-turn/session.jsonl
+++ b/examples/acp-agent/tests/snapshots/pwsh-tool-turn/session.jsonl
@@ -0,0 +1,34 @@
+{"type":"session","version":0,"id":"0b7ff6ab-2486-4b2f-a43e-0fa29a1a46ed","createdAt":1785678162241,"cwd":"{{cwd}}","delegationDepth":0}
+{"type":"agent/inbox/spliced","seq":0,"time":1785898456879,"data":{"target":"next-turn","start":0,"inserted":[{"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":"b4ce4fdc-a87a-41d0-b418-80a0fb235abb"}]}}
+{"type":"turn/start","seq":1,"time":1785898456880,"data":{"turn":1}}
+{"type":"agent/inbox/spliced","seq":2,"time":1785898456880,"data":{"target":"next-turn","start":0,"removedCount":1,"inserted":[]}}
+{"type":"step/start","seq":3,"time":1785678162261,"data":{"turn":1,"step":1}}
+{"type":"user/message","seq":4,"time":1785898456903,"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":"b4ce4fdc-a87a-41d0-b418-80a0fb235abb"},"surfaceOp":"append"}
+{"type":"session/title","seq":5,"time":1785898456903,"data":{"title":"Use the pwsh tool to","messageSeqs":[4],"source":{"kind":"fallback"}}}
+{"type":"request/header","seq":6,"time":1785898456904,"data":{"header":{"config":{"provider":"deepseek-official","model":"deepseek-v4-pro"},"system":"{{system}}","tools":"{{tools}}"},"reason":"initial"}}
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+{"type":"assistant/chunk","seq":76,"time":1785678165136,"data":{"turn":1,"step":2,"chunk":{"type":"block-start","index":0,"blockType":"reasoning"}}}
+{"type":"reasoning-chunks","seq0":77,"time0":1785678165312,"data":{"turn":1,"step":2,"index":0,"dt":[44,56,0,0,42,0,0,0,48,0,0,0,48,0,0,60,0,0,0,0,39,0,0,0],"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":102,"time":1785678165649,"data":{"turn":1,"step":2,"chunk":{"type":"block-start","index":1,"blockType":"text"}}}
+{"type":"assistant/chunk","seq":103,"time":1785678165649,"data":{"turn":1,"step":2,"chunk":{"type":"text-delta","index":1,"text":"D"}}}
+{"type":"assistant/chunk","seq":104,"time":1785678165693,"data":{"turn":1,"step":2,"chunk":{"type":"text-delta","index":1,"text":"ONE"}}}
+{"type":"assistant/chunk","seq":105,"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":106,"time":1785678165693,"data":{"turn":1,"step":2,"chunk":{"type":"block-end","index":1,"block":{"type":"text","text":"DONE"}}}}
+{"type":"assistant/chunk","seq":107,"time":1785678165693,"data":{"turn":1,"step":2,"chunk":{"type":"usage","usage":{"inputTokens":90,"outputTokens":28,"cacheReadTokens":1280,"reasoningTokens":25}}}}
+{"type":"assistant/chunk","seq":108,"time":1785898456944,"data":{"turn":1,"step":2,"chunk":{"type":"finish","reason":{"kind":"stop"}}}}
+{"type":"assistant/message","seq":109,"time":1785898456944,"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":"36aaf6a0-1556-42e4-aed3-626caa8f7aaf"},"usage":{"inputTokens":90,"outputTokens":28,"cacheReadTokens":1280,"reasoningTokens":25}},"sourceEventSeqs":[76,77,78,79,80,81,82,83,84,85,86,87,88,89,90,91,92,93,94,95,96,97,98,99,100,101,102,103,104,105,106,107,108],"surfaceOp":"append"}
+{"type":"step/end","seq":110,"time":1785898456944,"data":{"turn":1,"step":2}}
+{"type":"turn/end","seq":111,"time":1785898456944,"data":{"turn":1,"reason":{"kind":"completed"}}}
--- a/examples/acp-agent/tests/snapshots/pwsh-tool-turn/stdout.expected.jsonl
+++ b/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"}}
--- a/examples/acp-agent/tests/snapshots/pwsh-tool-turn/system-prompt.expected.md
+++ b/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.
--- a/examples/acp-agent/tests/snapshots/pwsh-tool-turn/tool-schemas.expected.json
+++ b/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": []
+}
--- a/examples/acp-agent/tests/snapshots/repeat-tool-guard/session.jsonl
+++ b/examples/acp-agent/tests/snapshots/repeat-tool-guard/session.jsonl
@@ -1,73 +1,79 @@
 {"type":"session","version":0,"id":"{{sessionId}}","createdAt":0,"cwd":"{{cwd}}","delegationDepth":0}
-{"type":"turn/start","seq":0,"time":0,"data":{"turn":1,"trigger":{"kind":"message","source":{"kind":"user"}}}}
-{"type":"user/message","seq":1,"time":0,"data":{"content":[{"type":"text","text":"Write the todo list 'watch the kettle boil' five times in a row without changing it, then reply DONE."}],"source":{"kind":"user"},"role":"user","id":"0a8a60c7-eece-48d5-ac75-fb39c9d79c56"},"surfaceOp":"append"}
-{"type":"session/title","seq":2,"time":0,"data":{"title":"Write the todo list 'watch","messageSeqs":[1],"source":{"kind":"fallback"}}}
-{"type":"user/message","seq":3,"time":1785464649934,"data":{"content":[{"type":"text","text":"Current runtime context. This snapshot supersedes earlier runtime-context snapshots.\n\nCurrent DSH file policy: danger-full-access. The DSH file sandbox does not restrict file modifications by available operations.\n\nApproval prompts are disabled in this session: actions that require approval are rejected automatically — do not request sandbox escalation (do not set `sandbox_permissions`)."}],"source":{"kind":"plugin","plugin":"@deepseek-ai/dsh-system-prompt"},"role":"user","id":"60a180b9-4aea-4d04-87aa-9e19cde4d6de"},"surfaceOp":"append"}
-{"type":"step/start","seq":4,"time":1785464649934,"data":{"turn":1,"step":1}}
-{"type":"request/header","seq":5,"time":1785464649935,"data":{"header":{"config":{"provider":"deepseek-official","model":"deepseek-v4-flash"},"system":"{{system}}","tools":"{{tools}}"},"reason":"initial"}}
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--- a/examples/acp-agent/tests/snapshots/session-query-spill/session.jsonl
+++ b/examples/acp-agent/tests/snapshots/session-query-spill/session.jsonl
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-{"type":"assistant/chunk","seq":8,"time":0,"data":{"turn":1,"step":1,"chunk":{"type":"tool-call-delta","index":0,"id":"call_session_query_spill","name":"session_event_read","argumentsDelta":"{\"seq\":5}"}}}
-{"type":"assistant/chunk","seq":9,"time":0,"data":{"turn":1,"step":1,"chunk":{"type":"block-end","index":0,"block":{"type":"tool-call","id":"call_session_query_spill","name":"session_event_read","arguments":"{\"seq\":5}"}}}}
-{"type":"assistant/chunk","seq":10,"time":1785464635091,"data":{"turn":1,"step":1,"chunk":{"type":"usage","usage":{"inputTokens":10,"outputTokens":5}}}}
-{"type":"assistant/chunk","seq":11,"time":1785487583784,"data":{"turn":1,"step":1,"chunk":{"type":"finish","reason":{"kind":"tool-calls"}}}}
-{"type":"assistant/message","seq":12,"time":1785487583784,"data":{"turn":1,"step":1,"message":{"role":"assistant","content":[{"type":"tool-call","id":"call_session_query_spill","name":"session_event_read","arguments":"{\"seq\":5}"}],"source":{"kind":"model","provider":"deepseek-official","model":"deepseek-v4-flash"},"id":"93e52142-e666-42f0-a2d8-97ac4cce08d5"},"usage":{"inputTokens":10,"outputTokens":5}},"sourceEventSeqs":[7,8,9,10,11],"surfaceOp":"append"}
-{"type":"tool/call","seq":13,"time":1785487583784,"data":{"turn":1,"step":1,"callId":"call_session_query_spill","name":"session_event_read","arguments":"{\"seq\":5}"}}
-{"type":"tool/result","seq":14,"time":1785487583793,"data":{"turn":1,"step":1,"message":{"source":{"kind":"tool","callId":"call_session_query_spill"},"content":[{"type":"tool-result","toolCallId":"call_session_query_spill","content":[{"type":"text","text":"Session {{sessionId}} — Read request event 5 with\nTarget event seq 5:\n```json\n{\n  \"type\": \"request/header\",\n  \"seq\": 5,\n  \"time\": 1785487583775,\n  \"data\": {\n    \"header\": {\n      \"config\": {\n        \"provider\": \"deepseek-official\",\n        \"model\": \"deepseek-v4-flash\"\n rmissions: one sentence for the user explaining why this exact file operation needs the wider access.\"\n              }\n            },\n            \"required\": [\n              \"file_path\",\n              \"content\"\n            ]\n          }\n        }\n      ]\n    },\n    \"reason\": \"initial\"\n  }\n}\n```\n\n(Omitted 35794 bytes. Full formatted result stored at: /tmp/dsh-acp-snap-035d1d054/session-0a508d3a5c8b/adedf3ca051a-session_event_read.txt. Use read with offset/limit, or grep this path to search within it.)"}],"isError":false}],"role":"user","id":"cc4aac80-24a4-4a27-99d9-fbcafc812d63"}},"sourceEventSeqs":[13],"surfaceOp":"append"}
-{"type":"step/end","seq":15,"time":1785487583794,"data":{"turn":1,"step":1}}
-{"type":"step/start","seq":16,"time":1785487583801,"data":{"turn":1,"step":2}}
-{"type":"assistant/chunk","seq":17,"time":0,"data":{"turn":1,"step":2,"chunk":{"type":"block-start","index":0,"blockType":"tool-call"}}}
-{"type":"assistant/chunk","seq":18,"time":0,"data":{"turn":1,"step":2,"chunk":{"type":"tool-call-delta","index":0,"id":"call_verify_session_query_spill","name":"bash","argumentsDelta":"{\"command\":\"file=$(find /tmp/dsh-acp-snap-035d1d054 -name '*-session_event_read.txt' -type f); grep -q request/header \\\"$file\\\" && grep -q session_event_search \\\"$file\\\" && echo SPILL_CANONICAL_OK\",\"description\":\"Verify complete session query spill\"}"}}}
-{"type":"assistant/chunk","seq":19,"time":0,"data":{"turn":1,"step":2,"chunk":{"type":"block-end","index":0,"block":{"type":"tool-call","id":"call_verify_session_query_spill","name":"bash","arguments":"{\"command\":\"file=$(find /tmp/dsh-acp-snap-035d1d054 -name '*-session_event_read.txt' -type f); grep -q request/header \\\"$file\\\" && grep -q session_event_search \\\"$file\\\" && echo SPILL_CANONICAL_OK\",\"description\":\"Verify complete session query spill\"}"}}}}
-{"type":"assistant/chunk","seq":20,"time":1785464635114,"data":{"turn":1,"step":2,"chunk":{"type":"usage","usage":{"inputTokens":10,"outputTokens":5}}}}
-{"type":"assistant/chunk","seq":21,"time":1785487583806,"data":{"turn":1,"step":2,"chunk":{"type":"finish","reason":{"kind":"tool-calls"}}}}
-{"type":"assistant/message","seq":22,"time":1785487583806,"data":{"turn":1,"step":2,"message":{"role":"assistant","content":[{"type":"tool-call","id":"call_verify_session_query_spill","name":"bash","arguments":"{\"command\":\"file=$(find /tmp/dsh-acp-snap-035d1d054 -name '*-session_event_read.txt' -type f); grep -q request/header \\\"$file\\\" && grep -q session_event_search \\\"$file\\\" && echo SPILL_CANONICAL_OK\",\"description\":\"Verify complete session query spill\"}"}],"source":{"kind":"model","provider":"deepseek-official","model":"deepseek-v4-flash"},"id":"98a8a3f7-a00d-485e-b1b7-128fdfa9f662"},"usage":{"inputTokens":10,"outputTokens":5}},"sourceEventSeqs":[17,18,19,20,21],"surfaceOp":"append"}
-{"type":"tool/call","seq":23,"time":1785487583807,"data":{"turn":1,"step":2,"callId":"call_verify_session_query_spill","name":"bash","arguments":"{\"command\":\"file=$(find /tmp/dsh-acp-snap-035d1d054 -name '*-session_event_read.txt' -type f); grep -q request/header \\\"$file\\\" && grep -q session_event_search \\\"$file\\\" && echo SPILL_CANONICAL_OK\",\"description\":\"Verify complete session query spill\"}"}}
-{"type":"tool/result","seq":24,"time":1785487583831,"data":{"turn":1,"step":2,"message":{"source":{"kind":"tool","callId":"call_verify_session_query_spill"},"content":[{"type":"tool-result","toolCallId":"call_verify_session_query_spill","content":[{"type":"text","text":"SPILL_CANONICAL_OK\n"}],"isError":false}],"role":"user","id":"06313924-d62f-4fa3-9e39-83c7ee37bfc4"}},"sourceEventSeqs":[23],"surfaceOp":"append"}
-{"type":"step/end","seq":25,"time":1785487583831,"data":{"turn":1,"step":2}}
-{"type":"step/start","seq":26,"time":1785487583838,"data":{"turn":1,"step":3}}
-{"type":"assistant/chunk","seq":27,"time":0,"data":{"turn":1,"step":3,"chunk":{"type":"block-start","index":0,"blockType":"text"}}}
-{"type":"assistant/chunk","seq":28,"time":0,"data":{"turn":1,"step":3,"chunk":{"type":"text-delta","index":0,"text":"DONE"}}}
-{"type":"assistant/chunk","seq":29,"time":0,"data":{"turn":1,"step":3,"chunk":{"type":"block-end","index":0,"block":{"type":"text","text":"DONE"}}}}
-{"type":"assistant/chunk","seq":30,"time":1785464635152,"data":{"turn":1,"step":3,"chunk":{"type":"usage","usage":{"inputTokens":10,"outputTokens":2}}}}
-{"type":"assistant/chunk","seq":31,"time":1785487583843,"data":{"turn":1,"step":3,"chunk":{"type":"finish","reason":{"kind":"stop"}}}}
-{"type":"assistant/message","seq":32,"time":1785487583843,"data":{"turn":1,"step":3,"message":{"role":"assistant","content":[{"type":"text","text":"DONE"}],"source":{"kind":"model","provider":"deepseek-official","model":"deepseek-v4-flash"},"id":"38628c04-99d6-40e6-ac32-b74be9a40234"},"usage":{"inputTokens":10,"outputTokens":2}},"sourceEventSeqs":[27,28,29,30,31],"surfaceOp":"append"}
-{"type":"step/end","seq":33,"time":1785487583844,"data":{"turn":1,"step":3}}
-{"type":"turn/end","seq":34,"time":1785487583844,"data":{"turn":1,"reason":{"kind":"completed"}}}
+{"type":"agent/inbox/spliced","seq":0,"time":1785498768943,"data":{"target":"next-turn","start":0,"inserted":[{"content":[{"type":"text","text":"Read request event 5 with session_event_read, verify the complete spill was retained, then reply DONE."}],"source":{"kind":"user"},"role":"user","id":"05ed182c-4c88-4019-912e-518ed6e431ba"}]}}
+{"type":"turn/start","seq":1,"time":1785821371103,"data":{"turn":1}}
+{"type":"agent/inbox/spliced","seq":2,"time":1785821371103,"data":{"target":"next-turn","start":0,"removedCount":1,"inserted":[]}}
+{"type":"step/start","seq":3,"time":0,"data":{"turn":1,"step":1}}
+{"type":"user/message","seq":4,"time":1785498768995,"data":{"content":[{"type":"text","text":"Read request event 5 with session_event_read, verify the complete spill was retained, then reply DONE."}],"source":{"kind":"user"},"role":"user","id":"05ed182c-4c88-4019-912e-518ed6e431ba"},"surfaceOp":"append"}
+{"type":"user/message","seq":5,"time":1785730422266,"data":{"content":[{"type":"text","text":"Current runtime context. This snapshot supersedes earlier runtime-context snapshots.\n\nCurrent DSH file policy: danger-full-access. The DSH file sandbox does not restrict file modifications by available operations.\n\nApproval prompts are disabled in this session: actions that require approval are rejected automatically — do not request sandbox escalation (do not set `sandbox_permissions`)."}],"source":{"kind":"plugin","plugin":"@deepseek-ai/dsh-system-prompt","form":"snapshot","sections":[{"name":"sandbox:policy","text":"Current DSH file policy: danger-full-access. The DSH file sandbox does not restrict file modifications by available operations."},{"name":"approval:policy","text":"Approval prompts are disabled in this session: actions that require approval are rejected automatically — do not request sandbox escalation (do not set `sandbox_permissions`)."}]},"role":"user","id":"82025f74-4ec2-4ac7-a90b-5eb18f184abb"},"surfaceOp":"append"}
+{"type":"session/title","seq":6,"time":1785730422266,"data":{"title":"Read request event 5 with","messageSeqs":[4],"source":{"kind":"fallback"}}}
+{"type":"request/header","seq":7,"time":1785498768997,"data":{"header":{"config":{"provider":"deepseek-official","model":"deepseek-v4-flash"},"system":"{{system}}","tools":"{{tools}}"},"reason":"initial"}}
+{"type":"request/context","seq":8,"time":1785730422267,"data":{"provider":"deepseek-official","model":"deepseek-v4-flash"}}
+{"type":"assistant/chunk","seq":9,"time":0,"data":{"turn":1,"step":1,"chunk":{"type":"block-start","index":0,"blockType":"tool-call"}}}
+{"type":"assistant/chunk","seq":10,"time":0,"data":{"turn":1,"step":1,"chunk":{"type":"tool-call-delta","index":0,"id":"call_session_query_spill","name":"session_event_read","argumentsDelta":"{\"seq\":5}"}}}
+{"type":"assistant/chunk","seq":11,"time":0,"data":{"turn":1,"step":1,"chunk":{"type":"block-end","index":0,"block":{"type":"tool-call","id":"call_session_query_spill","name":"session_event_read","arguments":"{\"seq\":5}"}}}}
+{"type":"assistant/chunk","seq":12,"time":1785498769006,"data":{"turn":1,"step":1,"chunk":{"type":"usage","usage":{"inputTokens":10,"outputTokens":5}}}}
+{"type":"assistant/chunk","seq":13,"time":1785730422276,"data":{"turn":1,"step":1,"chunk":{"type":"finish","reason":{"kind":"tool-calls"}}}}
+{"type":"assistant/message","seq":14,"time":1785730422276,"data":{"turn":1,"step":1,"message":{"role":"assistant","content":[{"type":"tool-call","id":"call_session_query_spill","name":"session_event_read","arguments":"{\"seq\":5}"}],"source":{"kind":"model","provider":"deepseek-official","model":"deepseek-v4-flash"},"id":"a4ee27a4-32b2-40d1-aeac-6a8bc8fcc2de"},"usage":{"inputTokens":10,"outputTokens":5}},"sourceEventSeqs":[9,10,11,12,13],"surfaceOp":"append"}
+{"type":"tool/call","seq":15,"time":1785730422276,"data":{"turn":1,"step":1,"callId":"call_session_query_spill","name":"session_event_read","arguments":"{\"seq\":5}"}}
+{"type":"tool/result","seq":16,"time":1785730422286,"data":{"turn":1,"step":1,"message":{"source":{"kind":"tool","callId":"call_session_query_spill"},"content":[{"type":"tool-result","toolCallId":"call_session_query_spill","content":[{"type":"text","text":"Session {{sessionId}} — Read request event 5 with\nTarget event seq 5:\n```json\n{\n  \"type\": \"user/message\",\n  \"seq\": 5,\n  \"time\": 1785987646184,\n  \"data\": {\n    \"content\": [\n      {\n        \"type\": \"text\",\n        \"text\": \"Current runtime context. This snapshot supersedes mpts are disabled in this session: actions that require approval are rejected automatically — do not request sandbox escalation (do not set `sandbox_permissions`).\"\n        }\n      ]\n    },\n    \"role\": \"user\",\n    \"id\": \"985f57e7-e296-4210-af78-78a485f09894\"\n  },\n  \"surfaceOp\": \"append\"\n}\n```\n\n(Omitted 782 bytes. Full formatted result stored at: /tmp/dsh-acp-snap-035d1d054/session-aa56455bb13a/dfff8c2b8a66-session_event_read.txt. Use read with offset/limit, or grep this path to search within it.)"}],"isError":false}],"role":"user","id":"8f96f03f-4fca-4c3a-ba34-ce891adde50f"}},"sourceEventSeqs":[15],"surfaceOp":"append"}
+{"type":"step/end","seq":17,"time":1785730422286,"data":{"turn":1,"step":1}}
+{"type":"step/start","seq":18,"time":1785730422296,"data":{"turn":1,"step":2}}
+{"type":"assistant/chunk","seq":19,"time":0,"data":{"turn":1,"step":2,"chunk":{"type":"block-start","index":0,"blockType":"tool-call"}}}
+{"type":"assistant/chunk","seq":20,"time":0,"data":{"turn":1,"step":2,"chunk":{"type":"tool-call-delta","index":0,"id":"call_verify_session_query_spill","name":"bash","argumentsDelta":"{\"command\":\"file=$(find /tmp/dsh-acp-snap-035d1d054 -name '*-session_event_read.txt' -type f); grep -q request/header \\\"$file\\\" && grep -q session_event_search \\\"$file\\\" && echo SPILL_CANONICAL_OK\",\"description\":\"Verify complete session query spill\"}"}}}
+{"type":"assistant/chunk","seq":21,"time":0,"data":{"turn":1,"step":2,"chunk":{"type":"block-end","index":0,"block":{"type":"tool-call","id":"call_verify_session_query_spill","name":"bash","arguments":"{\"command\":\"file=$(find /tmp/dsh-acp-snap-035d1d054 -name '*-session_event_read.txt' -type f); grep -q request/header \\\"$file\\\" && grep -q session_event_search \\\"$file\\\" && echo SPILL_CANONICAL_OK\",\"description\":\"Verify complete session query spill\"}"}}}}
+{"type":"assistant/chunk","seq":22,"time":1785498769028,"data":{"turn":1,"step":2,"chunk":{"type":"usage","usage":{"inputTokens":10,"outputTokens":5}}}}
+{"type":"assistant/chunk","seq":23,"time":1785730422300,"data":{"turn":1,"step":2,"chunk":{"type":"finish","reason":{"kind":"tool-calls"}}}}
+{"type":"assistant/message","seq":24,"time":1785730422301,"data":{"turn":1,"step":2,"message":{"role":"assistant","content":[{"type":"tool-call","id":"call_verify_session_query_spill","name":"bash","arguments":"{\"command\":\"file=$(find /tmp/dsh-acp-snap-035d1d054 -name '*-session_event_read.txt' -type f); grep -q request/header \\\"$file\\\" && grep -q session_event_search \\\"$file\\\" && echo SPILL_CANONICAL_OK\",\"description\":\"Verify complete session query spill\"}"}],"source":{"kind":"model","provider":"deepseek-official","model":"deepseek-v4-flash"},"id":"00965b8a-4e8a-40e4-9418-fdb044859156"},"usage":{"inputTokens":10,"outputTokens":5}},"sourceEventSeqs":[19,20,21,22,23],"surfaceOp":"append"}
+{"type":"tool/call","seq":25,"time":1785730422301,"data":{"turn":1,"step":2,"callId":"call_verify_session_query_spill","name":"bash","arguments":"{\"command\":\"file=$(find /tmp/dsh-acp-snap-035d1d054 -name '*-session_event_read.txt' -type f); grep -q request/header \\\"$file\\\" && grep -q session_event_search \\\"$file\\\" && echo SPILL_CANONICAL_OK\",\"description\":\"Verify complete session query spill\"}"}}
+{"type":"tool/result","seq":26,"time":1785730422323,"data":{"turn":1,"step":2,"message":{"source":{"kind":"tool","callId":"call_verify_session_query_spill"},"content":[{"type":"tool-result","toolCallId":"call_verify_session_query_spill","content":[{"type":"text","text":"(no output)\n[exit code: 1]"}],"isError":false}],"role":"user","id":"e43faec5-4511-48d9-8021-c56b7f7cb794"}},"sourceEventSeqs":[25],"surfaceOp":"append"}
+{"type":"step/end","seq":27,"time":1785730422323,"data":{"turn":1,"step":2}}
+{"type":"step/start","seq":28,"time":1785730422332,"data":{"turn":1,"step":3}}
+{"type":"assistant/chunk","seq":29,"time":0,"data":{"turn":1,"step":3,"chunk":{"type":"block-start","index":0,"blockType":"text"}}}
+{"type":"assistant/chunk","seq":30,"time":0,"data":{"turn":1,"step":3,"chunk":{"type":"text-delta","index":0,"text":"DONE"}}}
+{"type":"assistant/chunk","seq":31,"time":0,"data":{"turn":1,"step":3,"chunk":{"type":"block-end","index":0,"block":{"type":"text","text":"DONE"}}}}
+{"type":"assistant/chunk","seq":32,"time":1785498769063,"data":{"turn":1,"step":3,"chunk":{"type":"usage","usage":{"inputTokens":10,"outputTokens":2}}}}
+{"type":"assistant/chunk","seq":33,"time":1785730422336,"data":{"turn":1,"step":3,"chunk":{"type":"finish","reason":{"kind":"stop"}}}}
+{"type":"assistant/message","seq":34,"time":1785730422337,"data":{"turn":1,"step":3,"message":{"role":"assistant","content":[{"type":"text","text":"DONE"}],"source":{"kind":"model","provider":"deepseek-official","model":"deepseek-v4-flash"},"id":"59890792-9e9c-4be8-b4f4-d25ff06855d2"},"usage":{"inputTokens":10,"outputTokens":2}},"sourceEventSeqs":[29,30,31,32,33],"surfaceOp":"append"}
+{"type":"step/end","seq":35,"time":1785730422337,"data":{"turn":1,"step":3}}
+{"type":"turn/end","seq":36,"time":1785730422337,"data":{"turn":1,"reason":{"kind":"completed"}}}
--- a/examples/acp-agent/tests/snapshots/session-query-spill/tool-schemas.expected.json
+++ b/examples/acp-agent/tests/snapshots/session-query-spill/tool-schemas.expected.json
@@ -116,11 +116,36 @@
      }
    },
    {
-      "name": "list_agents",
-      "description": "List your continuable background subagents by durable id and label. Status is a snapshot of the stored record: running means the subagent session is currently live in this process, complete means it exists only in storage and a `send_message` starts a new turn on the same conversation. The snapshot is not a delivery promise — `send_message` performs the authoritative check and may still fail. Children that could not be read are reported as diagnostics instead of being silently dropped.",
+      "name": "interrupt_agent",
+      "description": "Request cancellation of a background agent's current turn by its agent id. The target may be your direct child or a deeper agent created under you. Only the current turn stops: messages already queued for the agent stay parked until a later send_message, agents it started keep running, and the agent itself stays available for follow-ups. This call returns as soon as the stop request is accepted, so the target may keep running briefly; interrupting an agent that already finished is an accepted no-op.",
      "parameters": {
        "type": "object",
-        "properties": {}
+        "properties": {
+          "agent_id": {
+            "type": "string",
+            "description": "The agent id of the running agent to interrupt."
+          }
+        },
+        "required": [
+          "agent_id"
+        ]
+      }
+    },
+    {
+      "name": "list_agents",
+      "description": "List your continuable background subagents by durable id and label. Status comes from the live registry: running means the agent is working right now, idle means it is loaded but between turns (it may be waiting on agents it started), and complete means it exists only in storage — a direct child remains a `send_message` candidate in every status. The snapshot is not a delivery promise — `send_message` performs the authoritative check and may still fail. Children that could not be read are reported as diagnostics instead of being silently dropped. Scope `descendants` walks the whole tree below you in stable pre-order, annotating each entry with its durable direct-parent session id and depth. You may use `send_message` only for depth-1 entries; deeper entries are candidates for `interrupt_agent` only.",
+      "parameters": {
+        "type": "object",
+        "properties": {
+          "scope": {
+            "type": "string",
+            "description": "children (default) lists direct children only; descendants walks the complete tree below you.",
+            "enum": [
+              "children",
+              "descendants"
+            ]
+          }
+        }
      }
    },
    {
@@ -512,7 +537,7 @@
    },
    {
      "name": "todo_write",
-      "description": "Record and update a structured task list for the current work. Send the ENTIRE list every call — it REPLACES the previous list (there are no partial updates, no per-item edits). Use it to plan multi-step work and show progress: add one todo per concrete step before you start. Keep AT MOST ONE todo `in_progress` at a time; while work remains, exactly one active task should be `in_progress`. Mark a todo `completed` the moment it is done (do not batch completions), and allow no `in_progress` item only once all work is complete. Skip the list for trivial single-step tasks. Statuses: `pending` (not started), `in_progress` (being worked on now), `completed` (finished).",
+      "description": "Record and update a structured task list for the current work. Send the ENTIRE list every call — it REPLACES the previous list (there are no partial updates, no per-item edits). Use it to plan multi-step work and show progress: add one todo per concrete step before you start. Mark every todo being actively worked on `in_progress` — several at once when work genuinely runs in parallel (e.g. concurrent subagents or background commands), one for sequential work; while work remains, at least one task should be `in_progress`. Mark a todo `completed` the moment it is done (do not batch completions), and allow no `in_progress` item only once all work is complete. Skip the list for trivial single-step tasks. Statuses: `pending` (not started), `in_progress` (being worked on now), `completed` (finished).",
      "parameters": {
        "type": "object",
        "properties": {
--- a/examples/acp-agent/tests/snapshots/session-sandbox-root/session.jsonl
+++ b/examples/acp-agent/tests/snapshots/session-sandbox-root/session.jsonl
@@ -1,26 +1,28 @@
 {"type":"session","version":0,"id":"00000000-0000-0000-0000-000000000000","createdAt":0,"cwd":"/Users/cty/acp-snap-cwd-MABAjO","delegationDepth":0}
-{"type":"turn/start","seq":0,"time":1784567324138,"data":{"turn":1,"trigger":{"kind":"message","source":{"kind":"user"}}}}
-{"type":"user/message","seq":1,"time":1784821266392,"data":{"content":[{"type":"text","text":"Use the write tool (NOT bash) to create session-root.txt in the current directory containing exactly: session root. Then reply with exactly the single word DONE."}],"source":{"kind":"user"},"role":"user","id":"8b7533eb-79db-459d-8ab5-e17a69aa99e0"},"surfaceOp":"append"}
-{"type":"session/title","seq":2,"time":1784821266392,"data":{"title":"Use the write tool (NOT","messageSeqs":[1],"source":{"kind":"fallback"}}}
-{"type":"user/message","seq":3,"time":1785464678705,"data":{"content":[{"type":"text","text":"Current runtime context. This snapshot supersedes earlier runtime-context snapshots.\n\nCurrent DSH file policy: workspace-write. Any available operation enforced by the DSH file sandbox may modify files under the session workspace: \"/Users/cty/acp-snap-cwd-MABAjO\". Some platform temporary areas may also be writable.\n\nApproval policy: ask. Operations that require approval may ask through the configured answerers; without an available answerer, the request fails closed."}],"source":{"kind":"plugin","plugin":"@deepseek-ai/dsh-system-prompt"},"role":"user","id":"ff65d0ad-f029-4d13-8d3d-10cc2f88cf3a"},"surfaceOp":"append"}
-{"type":"step/start","seq":4,"time":1785464678705,"data":{"turn":1,"step":1}}
-{"type":"request/header","seq":5,"time":1785464678705,"data":{"header":{"config":{"provider":"deepseek-official","model":"deepseek-v4-flash"},"system":"{{system}}","tools":"{{tools}}"},"reason":"initial"}}
-{"type":"request/context","seq":6,"time":1785487651556,"data":{"provider":"deepseek-official","model":"deepseek-v4-flash"}}
-{"type":"assistant/chunk","seq":7,"time":1784821266418,"data":{"turn":1,"step":1,"chunk":{"type":"block-start","index":0,"blockType":"tool-call"}}}
-{"type":"assistant/chunk","seq":8,"time":1784821266418,"data":{"turn":1,"step":1,"chunk":{"type":"tool-call-delta","index":0,"id":"call_session_root","name":"write","argumentsDelta":"{\"file_path\":\"session-root.txt\",\"content\":\"session root\"}"}}}
-{"type":"assistant/chunk","seq":9,"time":1784567324143,"data":{"turn":1,"step":1,"chunk":{"type":"block-end","index":0,"block":{"type":"tool-call","id":"call_session_root","name":"write","arguments":"{\"file_path\":\"session-root.txt\",\"content\":\"session root\"}"}}}}
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--- a/Show More
+++ b/Show More