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SubprocessHandle loses dispose(graces) and SubprocessDisposeGraces: the stdin-EOF→SIGTERM→SIGKILL sequence is teardown POLICY encoding one consumer's cooperation shape, not process vocabulary — the seam keeps kill/terminate/waitForExit, and waitForExit(signal?) is the quiescence probe a consumer ladder needs. dsh-subagent-acp owns disposeAcpChild() over those public verbs (tier tests move into its suite; a never-exits stub pins the fail-loud path); dsh-subprocess-local sheds the ladder, its deadline import, and the dsh-timeout dependency. Every future backend now owes four verbs and no teardown policy. New bilingual ladder-ownership Agent Note records the decision; catalogs regenerated.
subagent/ — subagent capability family
English | 中文
The subagent seam: an agent delegating work to a child agent. Like the bash and llm families this is a capability seam (see capability seams) — 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.
| Package | Role | ctx key |
|---|---|---|
subagent/ |
Abstract subagent seam: named-provider registry + vocabulary | ctx.subagents |
subagent-inprocess/ |
Shared in-process run driver (no provider; one cleanup effect per run) | — |
subagent-spawn/ |
In-process backend: a fresh child agent | (registers on ctx.subagents) |
subagent-fork/ |
In-process backend: a child seeded with the parent's completed-turn prefix | (registers on ctx.subagents) |
subagent-acp/ |
Out-of-process backend: a child agent in a spawned subprocess, driven over ACP | (registers on ctx.subagents) |
tool-subagent/ |
Model-facing subagent delegation tool over ctx.subagents |
(registers on ctx.tools) |
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 backend spawns its child through the subprocess/ seam (the shared credential scrub, tree-scoped teardown, and dispose ladder). Tests replace only the child boundary with package-local fixtures.
The proposal and design rationale: .agents/notes/implemented/feature/2026-06-21-subagent-capability-seam.md.