{
  "slug": "disable-javascript-evaluation-tools-eb11bc69637d",
  "title": "Disable JavaScript evaluation tools",
  "tools": [
    "chrome-devtools-mcp"
  ],
  "tags": [
    "agent"
  ],
  "introduced_at": "2026-09-08T09:49:22.000Z",
  "announced_at": "2026-09-08T09:49:22.000Z",
  "effective_at": null,
  "date_basis": "source-publication",
  "status": "unknown",
  "how": {
    "incantation": "When a workflow must not expose JavaScript evaluation, start Chrome DevTools MCP with `--javascript-evaluation=false` (or `--javascriptEvaluation=false`).",
    "examples": [
      "npx -y chrome-devtools-mcp@1.9.0 --javascript-evaluation=false"
    ],
    "gotchas": [
      "Version: 1.9.0",
      "--javascriptEvaluation / --javascript-evaluation: Boolean; defaults to `true`. Set to `false` to disable evaluation tools, `navigate_page`'s `initScript` parameter, and navigation to `javascript:`, `data:`, or `vbscript:` URLs.",
      "Prerequisite: Node.js LTS, npm, and current stable Chrome or newer are listed as requirements.",
      "The option is boolean and defaults to `true`."
    ]
  },
  "why_it_matters": "Disable script evaluation tools when running Chrome DevTools MCP for a workflow that must not expose JavaScript evaluation.",
  "before": "Leave the option at its default, `true`, and JavaScript evaluation tools remain available.",
  "sources": [
    "https://github.com/ChromeDevTools/chrome-devtools-mcp/releases/tag/chrome-devtools-mcp-v1.9.0",
    "https://github.com/ChromeDevTools/chrome-devtools-mcp/pull/2627",
    "https://github.com/ChromeDevTools/chrome-devtools-mcp/blob/chrome-devtools-mcp-v1.9.0/docs/configuration.md",
    "https://github.com/ChromeDevTools/chrome-devtools-mcp/blob/chrome-devtools-mcp-v1.9.0/README.md"
  ],
  "rank": 0.92026,
  "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-ce8e9fb01ddcf822-2:gate",
    "evidence_hash": "024b1f67e5767639eba974ae1629b86ebc2386599fa614679aeeb61533a8bdcb"
  },
  "review": {
    "draft_hash": "2cabe2d5d8513a2b6429aa64ab416282a2f4176a016eb0723bfd97620f14ffa1",
    "reviewer": "publication-gate",
    "reviewed_at": "2026-10-07T00:00:00.000Z",
    "decision": "ghtools-20261008:gate",
    "reason": "2 of 3 judge runs approved with p_yes >= 0.9 (mean 0.92 >= 0.9; 2 needed) and Jev gave 0.70 (>= 0.6 needed)."
  }
}