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VercelAndrew Qu1 min readrelease notesintro

WebMCP support now available in mcp-handler

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Summary

Vercel's mcp-handler 2.2.0 adds experimental WebMCP support, letting you expose registered MCP tools to in‑browser agents via a single script tag. The script proxies tool calls back to your MCP server with the signed‑in user’s credentials, so no extra OAuth flow is needed.

  • Add an `experimental_webMcp` object to the mcp-handler config to expose selected tools.
  • Load the generated script via `?webmcp-script` to make tools available in the page.
  • Tool calls are proxied to the MCP server using the signed‑in user's credentials, avoiding client‑side OAuth.
  • Requires upgrading to mcp-handler@2.2.0 and following the WebMCP documentation.

Frontend engineers building in‑browser agents or using Vercel’s MCP should care because it simplifies tool integration without extra auth handling.

4/10
api designtypescriptjavascriptwebmcp

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