ToolsSeptember 18, 2026via Vercel Blog
WebMCP support now available in mcp-handler
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.
Key signals
- WebMCP 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
The hook
WebMCP lands in production: in-browser agents just got a standard way to call your APIs.
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 fro…