Remote MCP Server On Cloudflare Uav

🚀 Running a Remote MCP Server on Cloudflare

Let's build a remote MCP server based on Cloudflare Workers and integrate OAuth login functionality!

🚀 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/.

🔗 Connecting MCP Inspector to Your Server

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

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

🔗 Connecting Claude Desktop to Your Local MCP Server

The inspector is great, but what we really want to do is connect this to Claude! Follow Anthropic's Quick Start Guide, go to "Settings" > "Developer" > "Edit Configuration" in Claude Desktop, and find your configuration file. Open the file in 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 and allow you to log in. You should see a list of available tools. With the right prompts, Claude should request to call tools.

🚀 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

🔗 Connecting a Remote MCP Client to Your Newly Deployed Remote MCP Server

Just as you did in "Local Development" above, 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 now connected to your MCP server via a remote MCP client.

🔗 Connecting 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 any issues arise, restarting Claude or directly connecting to your MCP server using the following command may help.

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

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

rm -rf ~/.mcp-auth