{
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  "parentUuid": "6610c2dd-f12c-4fc1-b1d4-fa78c1612692",
  "isSidechain": false,
  "message": {
    "role": "assistant",
    "type": "message",
    "model": "claude-opus-4-1-20250805",
    "id": "msg_01NtyE53hx2q89rMBGuw6qKD",
    "content": [
      {
        "type": "tool_use",
        "id": "toolu_011Hw84P45hT94xvZSGxn1AL",
        "name": "Grep",
        "input": {
          "pattern": "ul#models",
          "output_mode": "content",
          "-B": 2,
          "_note": "... +1 more fields"
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}