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feat(subagent): continuable background subagents

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Implement the continuable background subagents RFC: a durable child
session with a series of Task-backed activations, each disposing its
run before the Task settles.

- dsh-subagent: rename SubagentRun.sendMessage to strict steer, drop
  run-level resume, add SubagentProvider.resume dispatch via
  SubagentService.resume, the continuation start field, and the
  versioned model-hidden subagent/descriptor session event.
- dsh-subagent-inprocess/-spawn/-fork: publish the control-allocated
  child id, append the descriptor inside the initial turn, implement
  cold resume from the child's own transcript under the live parent
  scope, and strict running-only steer.
- dsh-subagent-control (new): SubagentControlService owning stable
  child ids, descriptor snapshot/fold/authorization, Task-backed
  activation with settle-then-dispose ordering, the process-local
  active-run association, and steer-or-resume sendMessage routing.
- dsh-tool-subagent: background route branches on the provider's
  resume capability (continuable via the control service; one-shot
  task for ACP), returning both child and task ids.
- dsh-tool-subagent-control (new): the globally named send_message
  tool rendering steered/started routes.

Keyless coverage spans Task ownership and disposal ordering, running
delivery, cold follow-up, descriptor rejection and rollback, known-id
reconstruction, kill during lookup, admission races, and a new
subagent-continuable ACP snapshot scenario.
This commit is contained in:
Dudu-0223
2026-07-23 17:07:38 +08:00
committed by imccyu
parent 76ff841279
commit 99a778d63f
83 changed files with 3167 additions and 627 deletions
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packages/subagent/README.zh.md
+8 -6
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@@ -6,14 +6,16 @@ subagent（子 agent）seam 允许 agent（智能体）把工作委派给子 age
| 包（package） | 角色 | ctx 键 |
|---|---|---|
| `subagent/` | 抽象 subagent seam：具名提供方注册表与词汇 | `ctx.subagents` |
| `subagent/` | 抽象 subagent seam：具名提供方注册表、词汇与持久化子 agent 描述符 | `ctx.subagents` |
| `subagent-inprocess/` | 共享进程内运行驱动器（不含提供方；每次运行使用一个清理 effect） | 无 |
| `subagent-spawn/` | 进程内后端：全新的子 agent | （注册到 `ctx.subagents`） |
| `subagent-fork/` | 进程内后端：以父 agent 已完成轮次的前缀作为初始内容的子 agent | （注册到 `ctx.subagents`） |
| `subagent-acp/` | 进程外后端：在 spawn 的子进程中运行并通过 ACP（Agent Client Protocol）驱动的子 agent | （注册到 `ctx.subagents`） |
| `subagent-spawn/` | 进程内后端：支持冷恢复的全新子 agent | （注册到 `ctx.subagents`） |
| `subagent-fork/` | 进程内后端：以父 agent 已完成轮次的前缀作为初始内容、支持冷恢复的子 agent | （注册到 `ctx.subagents`） |
| `subagent-acp/` | 进程外后端：在 spawn 的子进程中运行并通过 ACP（Agent Client Protocol）驱动的一次性子 agent | （注册到 `ctx.subagents`） |
| `subagent-dsh-sdk/` | 进程外后端：在 spawn 的子进程中运行的子 harness 运行时，经 TypeScript SDK 客户端走 stdio JSON-RPC 驱动 | （注册到 `ctx.subagents`） |
| `subagent-control/` | 可继续子 agent 编排：稳定 ID、描述符查找、由 Task 支撑的 activation，以及 steer 或恢复路由 | `ctx.subagentControl` |
| `tool-subagent/` | 面向模型的 `subagent` 委派工具，基于 `ctx.subagents` | （注册到 `ctx.tools`） |
| `tool-subagent-control/` | 基于 `ctx.subagentControl`、全局名称唯一的 `send_message` 后续消息工具 | （注册到 `ctx.tools`） |
接口位于 `subagent/subagent/`。进程内 `subagent-spawn` / `subagent-fork` 后端共享 `subagent-inprocess` 驱动器（一个自身不含提供方的库：两者都依赖它，彼此不依赖），进程外 `subagent-acp` / `subagent-dsh-sdk` 后端则经由 [`subprocess/`](../subprocess/README.md) seam spawn 其子进程（共享的凭据清除、以进程树为范围的拆卸、dispose（资源释放）阶梯）。测试只用包内 fixture（测试前置数据）替换子 agent 边界。
接口位于 `subagent/subagent/`。进程内 `subagent-spawn` / `subagent-fork` 后端共享 `subagent-inprocess` 驱动器（一个自身不含提供方的库：两者都依赖它，彼此不依赖），进程外 `subagent-acp` / `subagent-dsh-sdk` 后端则经由 [`subprocess/`](../subprocess/README.md) seam spawn 其子进程（共享的凭据清除、以进程树为范围的拆卸、dispose（资源释放）阶梯）。`subagent-control` 位于该 seam 之上：它把一个持久化子会话绑定到一系列可 dispose、由 Task 支撑的 activation，模型工具和面向人的适配器都通过这份统一契约进行路由。测试只用包内 fixture（测试前置数据）替换子 agent 边界。
提案与设计理由见 [.agents/notes/implemented/feature/2026-06-21-subagent-capability-seam.md](../../.agents/notes/implemented/feature/2026-06-21-subagent-capability-seam.md)。
提案与设计理由见 [.agents/notes/implemented/feature/2026-06-21-subagent-capability-seam.md](../../.agents/notes/implemented/feature/2026-06-21-subagent-capability-seam.md) 和 [.agents/notes/implemented/feature/2026-07-21-continuable-background-subagents.md](../../.agents/notes/implemented/feature/2026-07-21-continuable-background-subagents.md)。