Remote MCP Server On Cloudflare Nua

🚀 Deploying a Remote MCP Server on Cloudflare

Let's set up a running remote MCP server on Cloudflare Workers and integrate 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/.

🔗 Connecting 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 to connect to the MCP server, then click "Connect".
• You'll be redirected 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 now you can list and call any defined tools!

🔗 Connecting Claude Desktop to Your Local MCP Server

The MCP inspector is great, but what we really want to do is connect it to Claude! Follow Anthropic's Quick Start, and in Claude Desktop, go to "Settings" > "Developer" > "Edit Configuration" to find your configuration file.

Open the file in 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 you open Claude, a browser window will open, allowing you to log in. You should see available tools in the bottom right corner. With the correct prompts, Claude should ask to call the tools.

🚀 Deployment to Cloudflare

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

🔗 Calling 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, in the inspector, enter the workers.dev URL of your Cloudflare Worker (e.g., worker-name.account-name.workers.dev/sse) as the URL to connect to the MCP server, and click "Connect".

You've now connected the MCP server from a remote MCP client.

🔗 Connecting Claude Desktop to Your Remote MCP Server

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

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