{
  "slug": "playwright-mcp-exposes-page-registered-webmcp-tools-directly-935236dbf3c5",
  "title": "playwright-mcp exposes page-registered WebMCP tools directly",
  "tools": [
    "playwright-mcp"
  ],
  "tags": [
    "agent"
  ],
  "introduced_at": "2026-09-18T23:35:04.000Z",
  "announced_at": "2026-09-18T23:35:04.000Z",
  "effective_at": null,
  "date_basis": "source-publication",
  "status": "unknown",
  "how": {
    "incantation": "When the current tab exposes a page-registered WebMCP tool, call its `webmcp_<tool>` entry using the listed input schema. The tool list follows the current tab and may change; handle `tools/list_changed` notifications.",
    "gotchas": [
      "Version: v0.0.82",
      "Availability: WebMCP is experimental; see WebMCP in Chrome for how to enable it.",
      "webmcp_<tool> input parameters (required): Use the parameters in that page tool's listed input schema; they vary by page.",
      "--no-webmcp: Disables collection and exposure of page-registered WebMCP tools.",
      "webmcp: Set to `false` in the server config to disable page-registered WebMCP tools.",
      "PLAYWRIGHT_MCP_WEBMCP: Set to `false` to disable page-registered WebMCP tools.",
      "Prerequisite: Enable WebMCP in Chrome for local development: open `chrome://flags/#enable-webmcp-testing`, enable the flag, then relaunch Chrome.",
      "Tool names, descriptions, schemas, and results come from the page and are untrusted input.",
      "WebMCP must be enabled in Chrome; exact enablement steps are not supplied.",
      "Docs conflict: The newer v0.0.83 release notes say WebMCP tool calls work with Chromium 155+. That version-specific requirement is not established for v0.0.82."
    ]
  },
  "why_it_matters": "Call a page-provided operation directly while inspecting or interacting with a web application.",
  "before": "In v0.0.81, use `browser_webmcp_list` / `browser_webmcp_call`; v0.0.82 replaces these MCP tools with page-listed `webmcp_<tool>` tools.",
  "sources": [
    "https://github.com/microsoft/playwright-mcp/releases/tag/v0.0.82",
    "https://github.com/microsoft/playwright/blob/main/docs/src/getting-started-mcp.md",
    "https://github.com/microsoft/playwright-mcp/blob/main/README.md?plain=1",
    "https://developer.chrome.com/docs/ai/webmcp"
  ],
  "rank": 0.95044,
  "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": "gap-20261007",
    "verdict_id": "gap-20261007:gap-20261007-1476a1ed0e963f8c-1:gate",
    "evidence_hash": "cd12a512170139c06bf7fa634cbace15b7ec44034bee2468f191e7e7bc0e6209"
  },
  "review": {
    "draft_hash": "837cb9862ad503081cf3185a95ad05cc52d2894662c3e15e6b44faed4c39c5ed",
    "reviewer": "publication-gate",
    "reviewed_at": "2026-10-07T00:00:00.000Z",
    "decision": "gap-20261007:gate",
    "reason": "3 of 3 judge runs approved with p_yes >= 0.9 (mean 0.95 >= 0.9; 2 needed) and Jev gave 0.77 (>= 0.6 needed)."
  }
}