Files
deepseek-harness/packages/subagent
imccyu 6f77da4c8c refactor: relocate demo app bundles to packages/examples/*-demo
Move the agent-spine bundle and the stdio/ACP/JSON-RPC app packages out of
core/ and ui/ into a new packages/examples/ group, renamed with a -demo
suffix so the npm name marks them as non-product surface:

  core/agent-core   -> examples/agent-spine-demo  (dsh-agent-spine-demo)
  ui/stdio-agent    -> examples/stdio-demo        (dsh-stdio-demo)
  ui/acp-agent      -> examples/acp-demo          (dsh-acp-demo)
  ui/jsonrpc-agent  -> examples/jsonrpc-demo      (dsh-jsonrpc-demo)

Update every code/config/test reference and reference-only doc mentions, and
regenerate module-graph, config-catalog, and doc-graphs. The jsonrpc bin
(dsh-jsonrpc-agent) and single-file exe (dsh-jsonrpc-agent-pkg) keep their
names; the SDK runtime-startup surface is reconciled separately.
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..
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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.