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- @deepseek-ai/dsh-sdk-protocol: extract the line transport from dsh-jsonrpc and name the request/result/notification wire types both ends share; error responses preserve wire code/data via JsonRpcResponseError. - @deepseek-ai/dsh-sdk-client: TypeScript twin of the Python SDK — spawns the dsh-jsonrpc-agent runtime as a subprocess, drives stdio JSON-RPC turns (DeepSeekHarness high-level API + HarnessClient protocol client), scopes notifications to session trees client-side, and reaps the child through the shared subprocess dispose ladder. - @deepseek-ai/dsh-subagent-sdk: out-of-process subagent backend driving a child harness runtime through the TS SDK; shares cwd resolution with subagent-acp via new dsh-subagent-subprocess cwd helpers. - Keyless unit suites drive real subprocesses (scripted fake runtime peer); 100% per-file coverage on all touched packages.
subagent/ — subagent capability family
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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.