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Fix hidden Codex subagents and stuck parent sessions (#2068)

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* fix(server): prevent hidden Codex subagents and stuck turns

Codex can announce native children only through its mirrored lifecycle stream, while rejected interrupts previously looked like successful local cancellation. Preserve those child announcements and keep manager state active until the provider acknowledges cancellation.

* fix(server): block actions after rejected cancellation

A provider can accept a turn before publishing the turn ID needed to interrupt it. Keep that interval non-cancelable, and prevent reload, replacement, or rewind from proceeding without an acknowledged cancellation.

* fix(server): surface rejected agent cancellations

Replacement prompts and Stop requests could appear accepted after the provider kept ownership of the active turn. Complete replacement cancellation before detaching the stream, and return cancellation failures through the client response.

* fix(server): handle turn completion during cancellation

* fix: finish cancellation lifecycle handling

* fix(server): close remaining cancellation races

* fix(server): settle autonomous cancellations

* fix: honor cancellation failures at call sites

* refactor(server): centralize agent run state

* fix(server): keep pending runs isolated from stale events

* fix: surface remaining cancellation failures

* fix(server): narrow cancellation error handling
This commit is contained in:
Mohamed Boudra
2026-07-15 00:01:58 +02:00
committed by GitHub
parent 50ed0d0ab1
commit d706c4339b
33 changed files with 1597 additions and 432 deletions
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docs/agent-lifecycle.md
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@@ -12,6 +12,10 @@ initializing → idle → running → idle (or error → closed)
Each agent in `AgentManager` carries a `lastStatus` of `initializing`, `idle`, `running`, `error`, or `closed`. State transitions persist to disk and stream to subscribed clients via WebSocket.
### Cancellation
Cancellation changes lifecycle state only after the provider acknowledges the interrupt or emits a terminal turn event. If the interrupt is rejected or times out, the agent remains `running` with its active foreground turn intact. Follow-up actions such as replacement, reload, rewind, and Stop must report that failure instead of accepting work they cannot perform. Synthesizing a local cancellation without provider acknowledgment creates a split-brain session: Paseo accepts a new prompt while the provider still owns the previous foreground turn.
## Relationships
Agents can launch other agents via the agent-scoped `create_agent` MCP tool. Agent-scoped creation is always asynchronous. `relationship` and `workspace` are separate decisions: