Busy-session settings command, real MCP endpoint

base: {"content":[{"type":"text","text":"{\"sequence\":113}"}],"structuredContent":{"sequence":113},"isError":false}

head: {"content":[{"type":"text","text":"{\"_tag\":\"OrchestratorMcpFailure\",\"code\":\"orchestration_error\",\"message\":\"The current session is still running background agents or commands, and this change would end them. Wait for them to finish, or press Stop, then try again.\"}"}],"isError":true}

Read-only projection observation after those commands:
{
  "before": {
    "savedProvider": "devReplay",
    "bindings": []
  },
  "after": {
    "savedProvider": "claudeAgent",
    "bindings": [
      [
        "provider-session:provider-instance:codex:shared",
        "codex",
        "ready"
      ],
      [
        "provider-session:provider-instance:claudeAgent:thread:mcp%3A7e649af8-939d-420c-befe-934e47eb7908:2e2dbe68-210a-422f-bdff-01957d95aafd",
        "claudeAgent",
        "ready"
      ]
    ]
  }
}

Process observation after settings command: the head sleep 900 PID remained alive; the base sleep 900 PID had exited. Neither was signalled by the proof driver.

Natural completion and identical head retry:
{
  "savedProviderAfterRetry": "devReplay",
  "bindingsAfterRetry": [],
  "backgroundCommand": [
    {
      "input": "/bin/bash -lc 'sleep 900; echo bg-done'",
      "output": "bg-done\n",
      "status": "completed",
      "exitCode": 0,
      "completedAt": "2026-11-14T18:21:30.395Z"
    }
  ],
  "retry": {
    "content": [
      {
        "type": "text",
        "text": "{\"sequence\":149}"
      }
    ],
    "structuredContent": {
      "sequence": 149
    },
    "isError": false
  }
}