{
  "type": "control_request",
  "request_id": "init-1",
  "request": {
    "subtype": "initialize",
    "appendSubagentSystemPrompt": "## Cowork environment\n\nYou are running as a subagent inside a Cowork session. Shell commands execute in an isolated Linux sandbox rooted at /sessions/local_94v9zwdeo — files created there (or under /tmp) exist only in the sandbox, not on the user's real computer. User-attached folders are mounted under /sessions/local_94v9zwdeo/mnt/.",
    "hooks": {
      "PreToolUse": [
        {
          "matcher": "Task",
          "hookCallbackIds": [
            "cowork-task-bg-block"
          ]
        }
      ]
    }
  }
}