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42 lines
3.9 KiB
Markdown
42 lines
3.9 KiB
Markdown
# @deepseek-ai/dsh-subagent-inprocess
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This package is the shared run driver for the two in-process providers. Spawn passes no session seed; fork passes the parent's completed-turn prefix. Everything else—depth, child creation, optional child customization, result reading, cancellation, and disposal—has one implementation here.
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## Start contract
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`startInProcessRun(request, options): Promise<SubagentRun>` fulfills only after the child is published in `ctx.agents`. A rejected start has already quiesced the agent factory's unpublished creation transaction, so the caller never receives a half-created handle.
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The driver follows this sequence:
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1. Validate the parent depth and optional absolute `maxDepth`, then derive child depth as parent depth plus one.
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2. Call `parent.ctx.agents.create` directly, passing the required request signal into the factory's creation transaction.
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3. During that transaction's unpublished setup window, install the requested persona, tool restriction, and structured-output runtime.
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4. Publish the child, retain the returned `AgentHandle`, and drive one task with `child.send(prompt)` followed by `child.whenIdle()`.
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5. Read the child's own last assistant message and terminal turn reason, excluding any fork seed.
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The child gets the parent's working-directory/session lineage and inherits the parent model unless `request.agentOptions` overrides it. It gets a fresh flat registration scope: parent ownership does not import parent tool restrictions or establish an authority subset.
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## Cancellation and ownership
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The required request signal covers both startup and the live run. Before publication, `AgentCreationTransaction` observes it, rolls back, and rejects. The factory detaches that creation-only listener before returning; the driver immediately checks the signal once more before installing a minimal live-run listener, closing the handoff race. After publication, abort cancels the child.
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After fulfillment, the caller owns the run. Provider-plugin unload does not revoke it. `dispose()` removes the live abort listener, records cancellation, and delegates to the returned `AgentHandle.dispose()`, whose memoized quiescence transaction stops the loop, removes the agent and session, and unwinds scoped registrations. Cancellation owns every non-completed in-flight outcome and reports `aborted`; an already-completed turn remains completed.
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## Spawn and fork inputs
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`InProcessRunOptions` is `{ seed?: SessionEvent[] }`. Spawn omits it. Fork supplies a balanced completed-turn prefix and records its length so the result reader never mistakes a seeded parent message for child output.
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Depth enforcement is internal to `startInProcessRun`: it reads `AgentOptions.subagentDepth`, treats absence as top-level depth zero, rejects malformed stored values, and reports an attempted child depth above `maxDepth`. An unrepresentable depth above the safe-integer domain is a `RangeError`.
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## Structured output
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`attachStructuredRuntime(childCtx, schema)` installs the whole contract in the child's scope:
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- A `structured_output` tool registered with the requested schema validates and stages the model's value.
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- An order-190 system-prompt section tells the child that the tool call is the terminal answer.
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- Both contributions are ordinary child-scoped registrations. An expert `system-prompt/assemble` listener may replace them and therefore owns preserving the structured-output protocol for that child.
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- A `tools/result` observer commits a staged value only after that execution's authoritative final tool result succeeds, including the enclosing `run_code` result for Code Mode sub-dispatch.
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- A monotonic tool guard blocks later calls after capture, and `agent/turn-stop` ends the turn after the structured result commits.
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A clean turn that never commits the required structured value reports `error`; the driver does not re-prompt. All registrations ride the child fiber and disappear with it.
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