{
  "method": "sessionUpdate",
  "args": [
    {
      "sessionId": "test-session-id",
      "update": {
        "sessionUpdate": "tool_call_update",
        "toolCallId": "command-456",
        "status": "failed",
        "rawOutput": {
          "formatted_output": "cat: nonexistent.txt: No such file or directory",
          "exit_code": 1
        }
      }
    }
  ]
}