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feat(subagent): continuable background subagents

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Implement the continuable background subagents RFC: a durable child
session with a series of Task-backed activations, each disposing its
run before the Task settles.

- dsh-subagent: rename SubagentRun.sendMessage to strict steer, drop
  run-level resume, add SubagentProvider.resume dispatch via
  SubagentService.resume, the continuation start field, and the
  versioned model-hidden subagent/descriptor session event.
- dsh-subagent-inprocess/-spawn/-fork: publish the control-allocated
  child id, append the descriptor inside the initial turn, implement
  cold resume from the child's own transcript under the live parent
  scope, and strict running-only steer.
- dsh-subagent-control (new): SubagentControlService owning stable
  child ids, descriptor snapshot/fold/authorization, Task-backed
  activation with settle-then-dispose ordering, the process-local
  active-run association, and steer-or-resume sendMessage routing.
- dsh-tool-subagent: background route branches on the provider's
  resume capability (continuable via the control service; one-shot
  task for ACP), returning both child and task ids.
- dsh-tool-subagent-control (new): the globally named send_message
  tool rendering steered/started routes.

Keyless coverage spans Task ownership and disposal ordering, running
delivery, cold follow-up, descriptor rejection and rollback, known-id
reconstruction, kill during lookup, admission races, and a new
subagent-continuable ACP snapshot scenario.
This commit is contained in:
Dudu-0223
2026-07-23 17:07:38 +08:00
committed by imccyu
parent 76ff841279
commit 99a778d63f
83 changed files with 3167 additions and 627 deletions
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packages/subagent/subagent-spawn/src/index.ts
+8 -2
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@@ -8,8 +8,8 @@
import type { Context } from 'cordis'
import z from 'schemastery'
import type { SubagentCapabilities, SubagentProvider, SubagentStartRequest } from '@deepseek-ai/dsh-subagent'
import { startInProcessRun } from '@deepseek-ai/dsh-subagent-inprocess'
import type { SubagentCapabilities, SubagentProvider, SubagentResumeRequest, SubagentStartRequest } from '@deepseek-ai/dsh-subagent'
import { resumeInProcessRun, startInProcessRun } from '@deepseek-ai/dsh-subagent-inprocess'
export const name = 'subagent-spawn'
// `tools` is deliberately not injected: the child factory already provides it during setup,
@@ -46,6 +46,12 @@ class SpawnProvider implements SubagentProvider {
// request carries an outputSchema), and maps the result.
return startInProcessRun(request, {})
}
resume(request: SubagentResumeRequest) {
// Cold resume reconstructs the persisted child from its own transcript
// under the live parent scope; the shared driver drives the follow-up turn.
return resumeInProcessRun(request)
}
}
export function apply(ctx: Context, config: Config): void {