{
  "slug": "chrome-devtools-mcp-performance-tools-accept-filepath-for-raw-trace-output-e4d9c470b72a",
  "title": "chrome-devtools-mcp performance tools accept filePath for raw trace output",
  "tools": [
    "chrome-devtools-mcp"
  ],
  "tags": [
    "agent"
  ],
  "introduced_at": "2026-01-15T07:26:03.000Z",
  "announced_at": "2026-01-15T07:26:03.000Z",
  "effective_at": null,
  "date_basis": "source-publication",
  "status": "unknown",
  "how": {
    "incantation": "When profiling a web application, set `filePath` on `performance_start_trace` or `performance_stop_trace` to save the raw trace; use `.json.gz` for compressed output or `.json` for uncompressed output.",
    "examples": [
      "performance_start_trace({\"pageId\": <pageId>, \"filePath\": \"<trace.json.gz>\"})",
      "performance_stop_trace({\"pageId\": <pageId>, \"filePath\": \"<trace.json>\"})"
    ],
    "gotchas": [
      "Version: 0.13.0",
      "pageId (required): ID of the target page.",
      "filePath: Absolute path or path relative to the current working directory for raw trace output; `.json.gz` is compressed and `.json` is uncompressed.",
      "autoStop (required): On `performance_start_trace`, determines whether recording stops automatically.",
      "reload (required): On `performance_start_trace`, determines whether the target page reloads after tracing starts.",
      "Prerequisite: If `reload` or `autoStop` is true, navigate to the right URL before starting the trace.",
      "`filePath` is optional.",
      "The path may be absolute or relative to the current working directory."
    ]
  },
  "why_it_matters": "When profiling a repository's web application, save raw performance trace data to a file for inspection.",
  "sources": [
    "https://github.com/ChromeDevTools/chrome-devtools-mcp/releases/tag/chrome-devtools-mcp-v0.13.0",
    "https://github.com/ChromeDevTools/chrome-devtools-mcp/pull/686",
    "https://github.com/ChromeDevTools/chrome-devtools-mcp/blob/chrome-devtools-mcp-v0.13.0/docs/tool-reference.md"
  ],
  "rank": 0.95031,
  "judge": {
    "publish": true,
    "judge_model": "codex-cli/gpt-6-luna+typesafe/jev-1.13.0",
    "prompt_version": "extract-v7+enrich-v1+judge-v2x3+jev-publish-v1"
  },
  "review_state": "approved",
  "provenance": {
    "run_id": "ghtools-20261008",
    "verdict_id": "ghtools-20261008:ghtools-20261008-c89252d18edc3b60-1:gate",
    "evidence_hash": "d3c253c19ab8c7338b18c6e1d662de782e68651dda13ec8b2151b967237b769a"
  },
  "review": {
    "draft_hash": "39d8a9ab469487d482362c15755f8c68e06129938534d0746717a7b40b168b58",
    "reviewer": "publication-gate",
    "reviewed_at": "2026-10-07T00:00:00.000Z",
    "decision": "ghtools-20261008:gate",
    "reason": "3 of 3 judge runs approved with p_yes >= 0.9 (mean 0.95 >= 0.9; 2 needed) and Jev gave 0.79 (>= 0.6 needed)."
  }
}