Dudu-0223
99a778d63f
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.
22 lines
2.9 KiB
Markdown
22 lines
2.9 KiB
Markdown
# subagent/ — subagent capability family
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English | [中文](README.zh.md)
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The subagent seam: an agent delegating work to a child agent. Like the [bash](../bash/README.md) and [llm](../llm/README.md) families this is a capability seam (see [capability seams](../../.agents/notes/implemented/architecture/2026-06-13-capability-seams.md)) — but with one defining difference: **multiple provider implementations coexist in one context**, registered by name, rather than the single-implementation bash shape. The registry mirrors the LLM adapter registry.
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| Package | Role | ctx key |
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|---|---|---|
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| `subagent/` | Abstract subagent seam: named-provider registry + vocabulary + the durable child descriptor | `ctx.subagents` |
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| `subagent-inprocess/` | Shared in-process run driver (no provider; one cleanup effect per run) | — |
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| `subagent-spawn/` | In-process backend: a fresh child agent, with cold resume | (registers on `ctx.subagents`) |
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| `subagent-fork/` | In-process backend: a child seeded with the parent's completed-turn prefix, with cold resume | (registers on `ctx.subagents`) |
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| `subagent-acp/` | Out-of-process backend: a child agent in a spawned subprocess, driven over ACP (one-shot) | (registers on `ctx.subagents`) |
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| `subagent-dsh-sdk/` | Out-of-process backend: a child harness runtime in a spawned subprocess, driven over stdio JSON-RPC through the TypeScript SDK client | (registers on `ctx.subagents`) |
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| `subagent-control/` | Continuable-child orchestration: stable ids, descriptor lookup, Task-backed activation, steer-or-resume routing | `ctx.subagentControl` |
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| `tool-subagent/` | Model-facing `subagent` delegation tool over `ctx.subagents` | (registers on `ctx.tools`) |
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| `tool-subagent-control/` | The one globally named `send_message` follow-up tool over `ctx.subagentControl` | (registers on `ctx.tools`) |
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The interface lives at `subagent/subagent/`. The in-process `subagent-spawn` / `subagent-fork` backends share the `subagent-inprocess` driver (a library with no provider of its own — both depend on it, neither on the other), and the out-of-process `subagent-acp` / `subagent-dsh-sdk` backends spawn their children through the [`subprocess/`](../subprocess/README.md) seam (the shared credential scrub, tree-scoped teardown, and dispose ladder). `subagent-control` sits above the seam: it binds one durable child session to a series of disposable Task-backed activations, and both model tools and human-facing adapters route through its one contract. Tests replace only the child boundary with package-local fixtures.
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The proposals and design rationale: [.agents/notes/implemented/feature/2026-06-21-subagent-capability-seam.md](../../.agents/notes/implemented/feature/2026-06-21-subagent-capability-seam.md) and [.agents/notes/implemented/feature/2026-07-21-continuable-background-subagents.md](../../.agents/notes/implemented/feature/2026-07-21-continuable-background-subagents.md).
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