I built this library to turn your existing TypeScript functions into MCP tools in minutes

If you've ever walked through adding MCP to an existing Next․js or Express app‚ you've had to spin up yet another server‚ wire transports‚ learn the protocol‚ and open connections‚ none of which plays well with existing functions and infrastructure․

This is why I built Act-SDK for these two reasons:

Wrap your existing function with act․action() and you're instantly an MCP tool․ No rewrite‚ no separate process․

One route․ createNextHandler() in Next․js‚ and you're done․ Any MCP client (like Claude Code and Cursor) can call your app's functions instantly․

Works with Next․js today․ Adapters for Express‚ Hono‚ Fastify coming․

Github Repo