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9c1048f2b5
A request signal aborted BEFORE the run starts never fires an `abort` event (`addEventListener` only fires on the transition), so the backend-level bridge missed it and ran the child to `completed`. The driver now checks `request.signal?.aborted` at the top of the result path and settles `aborted` without running the child. Regression test proven red on the pre-fix code. Also refresh two stale RFC prose blocks the round-1 fix left behind: the subagent RFC's Problem statement (cited the removed `TODO(sub-agents)` markers and claimed nothing existed yet) and the unify-id RFC's fork/spawn risk bullet (described the seam as "explicitly deferred" via `AgentLoop.create`'s old TODO), now pointing at the realized seam.
subagent/ — subagent capability family
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-spawn/ |
In-process backend: a fresh child agent (+ the shared run driver) | (registers on ctx.subagents) |
subagent-fork/ |
In-process backend: a child seeded with the parent's completed-turn prefix | (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 ship here; the out-of-process dsh-subagent-acp and the test-only dsh-subagent-mock (in support) are separate. All product packages except the mock.
The proposal and design rationale: docs/rfc/proposed/feature/2026-06-21-subagent-capability-seam.md.