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MCP over Websockets on Cloudflare Durable Objects

This is a proof of concept Model Context Protocol (MCP) server running on a Cloudflare Durable Object.

The agent connects to the DO Server via a proxy using the JSON stdio transport, which is then forwarded to the DO Server via Websockets.

Agent <-stdio-> Proxy <-ws-> DO Server

Usage

  • Deploy to CloudFlare with npm run deploy.
  • Run the proxy server with npx tsx src/client.ts wss://my-durable-object.foo.workers.dev.
  • Use mcp inspector to test the server npx -y @modelcontextprotocol/inspector npx -y tsx src/client.ts wss://...