# WebMCP support now available in mcp-handler

> Source: <https://vercel.com/changelog/webmcp-mcp-handler>
> Published: 2026-09-18 18:00:00+00:00

`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.

Opt tools in by adding them to the `experimental_webMcp` object:

Then load the script from your MCP endpoint with the `?webmcp-script` parameter:

The 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.

Upgrade to `mcp-handler@2.2.0` and read the [documentation](https://github.com/vercel/mcp-handler/blob/main/docs/WEBMCP.md) to get started.