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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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6
examples/acp-agent/composition.md
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@@ -39,6 +39,10 @@ flowchart LR
cfg --> plugin_acp_subagent_spawn
plugin_acp_subagent_fork["subagent-fork<br/>@deepseek-ai/dsh-subagent-fork"]
cfg --> plugin_acp_subagent_fork
plugin_acp_subagent_control["subagent-control<br/>@deepseek-ai/dsh-subagent-control"]
cfg --> plugin_acp_subagent_control
plugin_acp_tool_subagent_control["tool-subagent-control<br/>@deepseek-ai/dsh-tool-subagent-control"]
cfg --> plugin_acp_tool_subagent_control
plugin_acp_tool_subagent["tool-subagent<br/>@deepseek-ai/dsh-tool-subagent"]
cfg --> plugin_acp_tool_subagent
plugin_acp_tool_subagent_fork["tool-subagent-fork<br/>@deepseek-ai/dsh-tool-subagent"]
@@ -79,6 +83,8 @@ flowchart LR
| `subagent` | `@deepseek-ai/dsh-subagent` |
| `subagent-spawn` | `@deepseek-ai/dsh-subagent-spawn` |
| `subagent-fork` | `@deepseek-ai/dsh-subagent-fork` |
| `subagent-control` | `@deepseek-ai/dsh-subagent-control` |
| `tool-subagent-control` | `@deepseek-ai/dsh-tool-subagent-control` |
| `tool-subagent` | `@deepseek-ai/dsh-tool-subagent` |
| `tool-subagent-fork` | `@deepseek-ai/dsh-tool-subagent` |
| `workflow-workerthread` | `@deepseek-ai/dsh-workflow-workerthread` |