{
  "name": "browser_profile_start",
  "description": "Start CPU profiling to capture call stack timing data. Use browser_profile_stop to end profiling and get results.",
  "arguments": {
    "type": "object",
    "properties": {
      "viewId": {
        "type": "string",
        "description": "Target browser tab ID. If omitted, uses the last interacted tab."
      }
    },
    "required": []
  }
}