WebMCP support now available in mcp-handler
WebMCP lands in production: in-browser agents just got a standard way to call your APIs.
Why it matters
WebMCP—a proposed web standard for exposing tools to browser-based agents—is now experimentally available in mcp-handler. Developers can add a single script tag to expose existing MCP tools to in-browser agents without OAuth complexity, lowering the friction for agent-native web integration.
The key facts
12 to knowWebMCP support now experimental in mcp-handler
Single script-tag integration for exposing MCP tools to in-browser agents
Authenticated tools work without browser-side OAuth flow
Tools opted in via experimental_webMcp object
Version: mcp-handler@2.2.0
Published: September 18, 2026
mcp-handler@2.2.0 adds experimental WebMCP support
Single script tag integration for MCP tool exposure
Proxied authenticated calls to MCP server (no browser-side OAuth required)
Tools opt-in via experimental_webMcp object
Script loaded via ?webmcp-script parameter
WebMCP is a proposed web standard for in-browser agent tooling
Go to the source
Vercel Blogvercel.com
Publisher excerpt: now has experimental support for , 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.mcp-handlerWebMCP Opt tools in by adding them to the object:experimental_webMcp Then load the script…