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https://github.com/deepseek-ai/deepseek-harness
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# Conflicts: # AGENTS.md # docs/config-catalog.md # docs/event-producer-consumer.md # examples/acp-agent/tests/snapshots/advanced-toolchain/stdout.golden.jsonl # examples/acp-agent/tests/snapshots/both-mode-turn/stdout.golden.jsonl # examples/acp-agent/tests/snapshots/cancel/stdout.golden.jsonl # examples/acp-agent/tests/snapshots/code-mode-turn/stdout.golden.jsonl # examples/acp-agent/tests/snapshots/config-options/stdout.golden.jsonl # examples/acp-agent/tests/snapshots/error-finish/stdout.golden.jsonl # examples/acp-agent/tests/snapshots/escalation-approved/session.jsonl # examples/acp-agent/tests/snapshots/escalation-approved/stdout.golden.jsonl # examples/acp-agent/tests/snapshots/escalation-rejected/session.jsonl # examples/acp-agent/tests/snapshots/escalation-rejected/stdout.golden.jsonl # examples/acp-agent/tests/snapshots/fs-edit/stdout.golden.jsonl # examples/acp-agent/tests/snapshots/fs-policy-reject/stdout.golden.jsonl # examples/acp-agent/tests/snapshots/fs-read-window/stdout.golden.jsonl # examples/acp-agent/tests/snapshots/fs-read/stdout.golden.jsonl # examples/acp-agent/tests/snapshots/fs-terminal-card/stdout.golden.jsonl # examples/acp-agent/tests/snapshots/fs-write-overwrite/stdout.golden.jsonl # examples/acp-agent/tests/snapshots/fs-write/stdout.golden.jsonl # examples/acp-agent/tests/snapshots/handshake/stdout.golden.jsonl # examples/acp-agent/tests/snapshots/hook-cc-posttool-block/stdout.golden.jsonl # examples/acp-agent/tests/snapshots/hook-cc-posttool-context/stdout.golden.jsonl # examples/acp-agent/tests/snapshots/hook-cc-pretool-ask/session.jsonl # examples/acp-agent/tests/snapshots/hook-cc-pretool-ask/stdout.golden.jsonl # examples/acp-agent/tests/snapshots/hook-cc-pretool-deny/stdout.golden.jsonl # examples/acp-agent/tests/snapshots/hook-cc-promptsubmit-block/stdout.golden.jsonl # examples/acp-agent/tests/snapshots/hook-cc-promptsubmit-context/stdout.golden.jsonl # examples/acp-agent/tests/snapshots/hook-cc-stop-continue/stdout.golden.jsonl # examples/acp-agent/tests/snapshots/hook-codex-posttool-block/stdout.golden.jsonl # examples/acp-agent/tests/snapshots/hook-codex-posttool-context/stdout.golden.jsonl # examples/acp-agent/tests/snapshots/hook-codex-pretool-block/stdout.golden.jsonl # examples/acp-agent/tests/snapshots/hook-codex-promptsubmit-block/stdout.golden.jsonl # examples/acp-agent/tests/snapshots/hook-codex-promptsubmit-context/stdout.golden.jsonl # examples/acp-agent/tests/snapshots/hook-codex-stop-continue/stdout.golden.jsonl # examples/acp-agent/tests/snapshots/multi-turn/stdout.golden.jsonl # examples/acp-agent/tests/snapshots/permission-switching/stdout.golden.jsonl # examples/acp-agent/tests/snapshots/repeat-tool-guard/stdout.golden.jsonl # examples/acp-agent/tests/snapshots/skill-load/stdout.golden.jsonl # examples/acp-agent/tests/snapshots/subagent-fork/stdout.golden.jsonl # examples/acp-agent/tests/snapshots/subagent-mixed/stdout.golden.jsonl # examples/acp-agent/tests/snapshots/subagent-multi/stdout.golden.jsonl # examples/acp-agent/tests/snapshots/subagent-spawn/stdout.golden.jsonl # examples/acp-agent/tests/snapshots/text-turn/stdout.golden.jsonl # examples/acp-agent/tests/snapshots/todo-plan/stdout.golden.jsonl # examples/acp-agent/tests/snapshots/tool-call-turn/stdout.golden.jsonl # examples/acp-agent/tests/snapshots/workflow-run/stdout.golden.jsonl # examples/acp-agent/tests/snapshots/workspace-edit/stdout.golden.jsonl # packages/ui/acp/README.md # packages/ui/acp/src/index.ts # packages/ui/jsonrpc/README.md # packages/ui/jsonrpc/src/server.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), the out-of-process subagent-acp backend builds on the subagent-subprocess library (the credential env scrub, the dispose ladder, isolated config dirs) and ships alongside them here; the test-only dsh-subagent-mock (in support) is separate. All product packages except the mock.
The proposal and design rationale: docs/rfc/implemented/feature/2026-06-21-subagent-capability-seam.md.