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# Conflicts: # .agents/notes/implemented/feature/2026-06-14-acp-agent-client-protocol.md # .agents/notes/implemented/feature/2026-06-14-acp-agent-client-protocol.zh.md # .agents/notes/implemented/feature/2026-06-30-hook-bridges.i18n.yaml # .agents/notes/implemented/feature/2026-06-30-interception-seams.i18n.yaml # .agents/notes/implemented/feature/2026-07-06-sandbox.i18n.yaml # .agents/notes/implemented/feature/2026-07-06-sandbox.md # .agents/notes/implemented/feature/2026-07-06-sandbox.zh.md # .agents/notes/implemented/feature/2026-07-19-model-facing-goal-tools.i18n.yaml # .agents/notes/implemented/feature/2026-07-19-same-session-goal-round-driver.i18n.yaml # .agents/notes/implemented/feature/2026-07-25-workspace-ui-product-flow.i18n.yaml # .agents/notes/implemented/simplification/2026-07-02-remove-stream-chunk-mirror.i18n.yaml # docs/architecture.i18n.yaml # docs/cookbook/adding-a-tool.i18n.yaml # docs/cookbook/extension-cookbook.i18n.yaml # docs/core-data-structures/llm-streaming.i18n.yaml # docs/core-data-structures/session.i18n.yaml # docs/core-data-structures/tools.i18n.yaml # docs/event-producer-consumer.md # docs/persistence-catalog.md # examples/acp-agent/tests/snapshots/cordis-inspect-jsdoc/stdout.expected.jsonl # examples/acp-agent/tests/snapshots/escalation-approved/session.jsonl # examples/acp-agent/tests/snapshots/escalation-rejected/session.jsonl # examples/acp-agent/tests/snapshots/fs-escalation-approved/session.jsonl # examples/acp-agent/tests/snapshots/hook-cc-pretool-ask/session.jsonl # examples/acp-agent/tests/snapshots/permission-switching/session.jsonl # examples/acp-agent/tests/snapshots/plan-mode-reject/session.jsonl # examples/acp-agent/tests/snapshots/plan-mode/session.jsonl # examples/acp-agent/tests/snapshots/session-sandbox-root/session.jsonl # packages/context/session-reference/README.md # packages/core/agent-loop/tests/agent.spec.ts # packages/hooks/hooks-claude/tests/coverage-cases.ts # packages/host/runtime/tests/host-runtime.spec.ts # packages/llm/llm-retry/tests/retry.spec.ts # packages/session-persistence/session-persistence/src/coordinator.ts # packages/support/acp-snapshot/README.md # packages/support/acp-snapshot/src/normalize.ts # packages/ui/acp/acp-feature-support.md # packages/ui/acp/src/codec.ts # packages/ui/acp/src/index.ts # packages/ui/acp/tests/bridge.spec.ts # packages/ui/acp/tests/codec.spec.ts # packages/ui/acp/tests/config-options.spec.ts # packages/ui/acp/tests/dispose.spec.ts # packages/ui/acp/tests/edges.spec.ts # packages/ui/acp/tests/stream-update.spec.ts # packages/ui/acp/tests/turns.spec.ts
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-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-subprocess/ |
Shared out-of-process machinery: env scrub, dispose ladder, isolated config dirs (pure lib; registers nothing) | — |
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 builds on the subagent-subprocess library (the credential env scrub, the dispose ladder, isolated config dirs). 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.