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The credential env scrub (SENSITIVE_ENV_PATTERN/buildChildEnv), the spawn-failure capture (spawnFailure), the child-exit waits (waitForExit/exitsWithin), and the stdin-EOF -> SIGTERM -> SIGKILL dispose ladder move out of subagent-acp into a new pure library package (the subagent-inprocess shape), with the ladder taking its two grace periods as parameters — defaults stay in the plugin Config. New isolated-config-dir helpers (mkdtemp create, best-effort remove; a pinned dir is never removed) land alongside for the CLAUDE_CONFIG_DIR / CODEX_HOME redirection the RFC names. The ACP backend migrates onto the library with no semantic change: its suite passes with import-path edits only. bash-local keeps its sibling copy, per the RFC's blast-radius call. RFC: docs/rfc/proposed/feature/2026-07-07-claude-code-and-codex-subagent-backends.md
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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 (pure lib; registers nothing) | — |
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-process/ |
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 pure library — both depend on it, neither on the other), the out-of-process subagent-acp backend builds on the subagent-process 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.