{"slug": "webmcp-support-now-available-in-mcp-handler", "title": "WebMCP support now available in mcp-handler", "summary": "Mcp-handler@2.2.0 now ships experimental support for WebMCP, the proposed web standard for exposing tools to in-browser agents, according to the project's maintainers. Developers opt tools in via the experimental_webMcp object and load the script from their MCP endpoint with the ?webmcp-script parameter, which registers those tools with the page and proxies each call back to the MCP server as the signed-in user, so authenticated tools work without a browser-side OAuth flow.", "body_md": "`mcp-handler` now has experimental support for [WebMCP](https://github.com/webmachinelearning/webmcp), the proposed web standard for exposing tools to in-browser agents. Add a single script tag to your site, and your existing MCP tools become available there too.\n\nOpt tools in by adding them to the `experimental_webMcp` object:\n\nThen load the script from your MCP endpoint with the `?webmcp-script` parameter:\n\nThe script registers those tools with the page and proxies each call back to your MCP server as the signed-in user, so authenticated tools work without a browser-side OAuth flow.\n\nUpgrade to `mcp-handler@2.2.0` and read the [documentation](https://github.com/vercel/mcp-handler/blob/main/docs/WEBMCP.md) to get started.", "url": "https://wpnews.pro/news/webmcp-support-now-available-in-mcp-handler", "canonical_source": "https://vercel.com/changelog/webmcp-mcp-handler", "published_at": "2026-09-18 18:00:00+00:00", "updated_at": "2026-09-18 19:55:28.861592+00:00", "lang": "en", "topics": ["ai-agents", "agent-protocols", "developer-tools", "ai-tools"], "entities": ["mcp-handler", "WebMCP", "Vercel"], "alternates": {"html": "https://wpnews.pro/news/webmcp-support-now-available-in-mcp-handler", "markdown": "https://wpnews.pro/news/webmcp-support-now-available-in-mcp-handler.md", "text": "https://wpnews.pro/news/webmcp-support-now-available-in-mcp-handler.txt", "jsonld": "https://wpnews.pro/news/webmcp-support-now-available-in-mcp-handler.jsonld"}}