Yichen Jiang
3957ce007a
# Conflicts: # apps/cli/cordis.yml # apps/cli/package.json # apps/cli/tests/tui-keyless-smoke.e2e.ts # apps/web/tests/details-session-lifecycle.e2e.ts # apps/web/tests/snapshots/code-mode-round/ui.expected.md # apps/web/tests/snapshots/cordis-tool-round/ui.expected.md # apps/web/tests/snapshots/fresh-round-trip/ui.expected.md # apps/web/tests/snapshots/lifecycle-chrome/hero.expected.md # apps/web/tests/snapshots/lifecycle-chrome/reloaded.expected.md # apps/web/tests/snapshots/live-interactions/cancel.expected.md # apps/web/tests/snapshots/live-interactions/error-auth.expected.md # apps/web/tests/snapshots/live-interactions/retry.expected.md # apps/web/tests/snapshots/message-actions/ui.expected.md # apps/web/tests/snapshots/question-composer/answered.expected.md # apps/web/tests/snapshots/seeded-history/ui.expected.md # apps/web/tests/snapshots/steering/mid-steer.expected.md # apps/web/tests/snapshots/steering/settled.expected.md # docs/cordis-catalog/events.md # docs/cordis-catalog/services.md # docs/event-producer-consumer.md # docs/user/guide/config.i18n.yaml # docs/user/guide/config.md # docs/user/guide/config.zh.md # docs/user/guide/index.i18n.yaml # docs/user/guide/index.md # docs/user/guide/index.zh.md # examples/acp-agent/tests/snapshots/subagent-fork/session.1.jsonl # examples/acp-agent/tests/snapshots/subagent-mixed/session.2.jsonl # examples/cordis-agent/cordis.yml # examples/cordis-agent/tests/cordis-tools.e2e.ts # examples/headless-agent/tests/semantic-checkpoint-snapshots/tool-outcome-unknown/session.expected.jsonl # examples/headless-agent/tests/subagent-inheritance-snapshots/parent-override/parent.expected.jsonl # examples/tui-agent/code-mode.cordis.yml # examples/tui-agent/cordis.yml # packages/examples/tui-demo/README.md # packages/examples/tui-demo/README.zh.md # packages/host/apiproxy/README.i18n.yaml # packages/pty/tool-bash-persistent/README.i18n.yaml # packages/ui/tui/tests/snapshots/status-diagnostics-narrow.expected.txt # packages/ui/tui/tests/snapshots/status-diagnostics.expected.txt # pnpm-lock.yaml # scripts/snapshots/python-sdk-single-exe/advanced/result.json # scripts/snapshots/python-sdk-single-exe/advanced/session.1.jsonl # scripts/snapshots/python-sdk-single-exe/advanced/session.2.jsonl # scripts/snapshots/python-sdk-single-exe/advanced/session.jsonl
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) |
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) |
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 / subagent-dsh-sdk backends spawn their children 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.