Jey MCP Server

🚀 Remote MCP Server Running on Cloudflare

Let's launch a remote MCP server on Cloudflare Workers with OAuth login!

🚀 Quick Start

🔨 Local Development

# Clone the repository
git clone git@github.com:cloudflare/ai.git

# Install dependencies
cd ai
npm install

# Run locally
npx nx dev remote-mcp-server

You should be able to open http://localhost:8787/ in your browser.

🔗 Connect MCP Inspector to Your Server

To explore the new MCP API, use the MCP Inspector.

• Start it with npx @modelcontextprotocol/inspector.
• Inside the inspector, switch the transport type to SSE and enter http://localhost:8787/sse as the URL to connect to the MCP server, then click "Connect".
• You'll be redirected to a (mock) user/password login screen. Enter any email and password to log in.
• You should be redirected back to the MCP inspector and can now list and call any defined tools!

🔗 Connect Claude Desktop to Your Local MCP Server

The MCP inspector is nice, but we really want to connect it to Claude! Follow Anthropic's Quick Start Guide, go to Settings > Developer > Edit Configuration in Claude Desktop to find your configuration file. Open the file with a text editor and replace it with the following content:

{
  "mcpServers": {
    "math": {
      "command": "npx",
      "args": [
        "mcp-remote",
        "http://localhost:8787/sse"
      ]
    }
  }
}

This will run a local proxy that allows Claude to communicate with your MCP server via HTTP. When you open Claude, a browser window should open, allowing you to log in. You should see the list of available tools in the bottom right corner. Given the correct prompt, Claude should request to call a tool.

🚀 Deployment to Cloudflare

1. npx wrangler kv namespace create OAUTH_KV
2. Follow the instructions to add the kv namespace ID to wrangler.jsonc
3. npm run deploy

🔗 Call Your Newly Deployed Remote MCP Server from a Remote MCP Client

Just as you did in "Local Development" above, run the MCP inspector: npx @modelcontextprotocol/inspector@latest Then enter your Worker's workers.dev URL (e.g., worker-name.account-name.workers.dev/sse) as the URL to connect to the MCP server in the inspector and click "Connect". You've connected to your MCP server via a remote MCP client.

🔗 Connect Claude Desktop to Your Remote MCP Server

Update the Claude configuration file to point to your workers.dev URL (e.g., worker-name.account-name.workers.dev/sse), then restart Claude.

{
  "mcpServers": {
    "math": {
      "command": "npx",
      "args": [
        "mcp-remote",
        "https://worker-name.account-name.workers.dev/sse"
      ]
    }
  }
}

🐞 Debugging

If something goes wrong, restarting Claude or directly connecting to your MCP server via the following command may help.

npx mcp-remote http://localhost:8787/sse

In rare cases, clearing the file added to ~/.mcp-auth may be helpful.

rm -rf ~/.mcp-auth