Real server MCP evidence | commit 5cff012416c25e6b88d7f61036171e47729c3f18
Environment: Linux; isolated fresh database; synthetic project; deterministic ACP agent.
1. Parent calls delegate_task(mode="async"); child waits at an explicit release gate.
2. Parent turn ended; delegated child still running.
t3_thread_read: {
  "threadId": "mcp:2dbb205a-8fef-46ef-a3a5-c88f0f992e9f",
  "title": "Parent background work",
  "status": "completed",
  "activeRunId": null
}
t3_thread_list (parent): {
  "threadId": "mcp:2dbb205a-8fef-46ef-a3a5-c88f0f992e9f",
  "title": "Parent background work",
  "status": "waiting"
}
Latest parent run status: completed
3. Release child and wait for the parent to handle its completion.
4. Same MCP calls after completion is handled.
t3_thread_read: {
  "threadId": "mcp:2dbb205a-8fef-46ef-a3a5-c88f0f992e9f",
  "title": "Parent background work",
  "status": "completed",
  "activeRunId": null
}
t3_thread_list (parent): {
  "threadId": "mcp:2dbb205a-8fef-46ef-a3a5-c88f0f992e9f",
  "title": "Parent background work",
  "status": "completed"
}
Latest parent run status: completed