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Merge origin/master into parallel-tool-call

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Dudu-0223
2026-07-16 14:56:02 +08:00
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packages/subagent/README.md
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@@ -14,6 +14,6 @@ The subagent seam: an agent delegating work to a child agent. Like the [bash](..
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](../support/README.md)) is separate. All **product** packages except the mock.
`SubagentProvider.start()` must be safe to call concurrently for independent runs: the `subagent` tool is parallel-safe, so one parent step may issue several subagent calls at once. Each backend reads the parent synchronously at start (a snapshot, never mutated or re-read during the run) — `fork` seeds each child from the parent's completed-turn prefix, which the open in-flight turn cannot change, so concurrent forks inside one open step all see the same stable prefix. A resource-limited provider may queue or cap internally, but must not require the loop to serialize every call.
`SubagentProvider.start()` must be safe to call concurrently for independent runs: foreground `subagent` calls are parallel-safe, so one parent step may issue several at once. Background starts remain exclusive while registering parent-owned task state. Each backend reads the parent synchronously at start (a snapshot, never mutated or re-read during the run) — `fork` seeds each child from the parent's completed-turn prefix, which the open in-flight turn cannot change, so concurrent forks inside one open step all see the same stable prefix. A resource-limited provider may queue or cap internally, but must not require the loop to serialize every foreground call.
The proposal and design rationale: [docs/rfc/implemented/feature/2026-06-21-subagent-capability-seam.md](../../docs/rfc/implemented/feature/2026-06-21-subagent-capability-seam.md).