Remote MCP Server On Cloudflare Nbf

🚀 Remote MCP Server Running on Cloudflare

Let's build a remote MCP server running on Cloudflare Workers that supports 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 a browser window at http://localhost:8787/.

📦 Connect the MCP Inspector to Your Server

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

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

💻 Connect Claude Desktop to Your Local MCP Server

The inspector is great, but we'd like 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 configuration:

{
  "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 over HTTP. When opening Claude, a browser window will open and allow you to log in. You should see available tools in the bottom right corner. Based on the correct prompts, Claude may 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", run the MCP Inspector: npx @modelcontextprotocol/inspector@latest Then enter the workers.dev URL of your worker (e.g., worker-name.account-name.workers.dev/sse) as the URL of the MCP server 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., https://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 you encounter any issues, restarting Claude or connecting directly to your MCP server via the command line may help.

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