{
  "approach": "Instead of attaching exactly one generic listener per final_setup_done, attach listeners uniquely identified by a qualified object id and ensure removal happens atomically\u2014installing once per target scope and cleaning up afterwards guarantees only the intended target\u2019s callback fires, preventing both premature invocation and missing registration.",
  "files_to_edit": [
    "openmdao/visualization/n2_viewer/n2_viewer.py"
  ],
  "finish_reason": "stop",
  "hypothesis": "When setting up systems recursively via final_setup, the top\u2011level Problem\u2019s last child subsystem triggers its own final_setup early due to depth\u2011first traversal, installing the \u2018final_setup_done\u2019 event handler on the sub\u2011problem; later, when the parent finishes, its already installed handlers fire again and control returns via sys.exit inside the handler attached to the sub\u2011problem.",
  "retries": {},
  "usage": {
    "completion": 170,
    "prompt": 22414,
    "reasoning": 0
  }
}