{
  "slug": "playwright-mcp-adds-webmcp-page-tool-listing-and-calls-f3e100c50807",
  "title": "playwright-mcp adds WebMCP page tool listing and calls",
  "tools": [
    "playwright-mcp"
  ],
  "tags": [
    "agent"
  ],
  "introduced_at": "2026-09-14T21:24:01.000Z",
  "announced_at": "2026-09-14T21:24:01.000Z",
  "effective_at": null,
  "date_basis": "source-publication",
  "status": "unknown",
  "how": {
    "incantation": "When a page registers WebMCP tools, check the page status for the available-tool count, then list the tools and call the relevant one with its documented input. Use this in Playwright MCP v0.0.81; current documentation describes a newer interface that replaces these MCP tools.",
    "examples": [
      "browser_webmcp_list()",
      "browser_webmcp_call({\"name\":\"<tool-name>\",\"params\":{<inputs matching the tool's inputSchema>},\"frame\":\"<frame>\"})"
    ],
    "gotchas": [
      "Version: v0.0.81",
      "Availability: WebMCP is experimental; enable it in Chrome as described in the linked WebMCP in Chrome documentation.",
      "browser_webmcp_list parameters: None are documented; it lists tools across all frames.",
      "name (required): Name of the WebMCP tool to call.",
      "params: Object of inputs matching the page tool's inputSchema.",
      "frame: Frame that registered the tool, as reported by browser_webmcp_list; use when that tool name occurs in multiple frames.",
      "Prerequisite: The page must register WebMCP tools. WebMCP is experimental; for local Chrome development, enable chrome://flags/#enable-webmcp-testing and relaunch Chrome.",
      "Prerequisite: Playwright MCP v0.0.81 README requires Node.js 18 or newer and an MCP client.",
      "The page must register WebMCP tools.",
      "Docs conflict: Current Playwright MCP documentation says page-registered tools are exposed directly as webmcp_<tool>; it says browser_webmcp_list and browser_webmcp_call are no longer exposed over MCP. This is newer behavior and does not change the v0.0.81 instructions. https://github.com/microsoft/playwright-mcp/releases"
    ]
  },
  "why_it_matters": "Use tools exposed by a WebMCP-enabled page to complete a browser task without driving its UI.",
  "sources": [
    "https://github.com/microsoft/playwright-mcp/releases/tag/v0.0.81",
    "https://github.com/microsoft/playwright-mcp/blob/v0.0.81/README.md",
    "https://developer.chrome.com/docs/ai/webmcp"
  ],
  "rank": 0.97022,
  "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": "augsep-20261008",
    "verdict_id": "augsep-20261008:augsep-20261008-e7a0a6fbfb76518d-0:gate",
    "evidence_hash": "0e8af0e406d203ba0c510e51b1aa052476224f3bf0b24fa867281197ccfb1886"
  },
  "review": {
    "draft_hash": "9fa5ca4116038d2a1698b0bd7bb106df59204fb56d41d4edb51ef7d37815f39f",
    "reviewer": "publication-gate",
    "reviewed_at": "2026-10-07T00:00:00.000Z",
    "decision": "augsep-20261008:gate",
    "reason": "3 of 3 judge runs approved with p_yes >= 0.9 (mean 0.97 >= 0.9; 2 needed) and Jev gave 0.67 (>= 0.6 needed)."
  }
}