Remote MCP Server On Cloudflare 5ee

🚀 Deploying 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 the MCP Inspector to Your Server

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

• Start it using npx @modelcontextprotocol/inspector.
• Inside the inspector (http://localhost:5173), switch the transport type to SSE and enter http://localhost:8787/sse as the MCP server address in the URL, then click "Connect".
• You'll enter a (simulated) user/password login page. 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 MCP Inspector is great, but we really want to connect it to Claude! Follow the Anthropic's Quick Start guide to go to Settings > Developer > Edit Configuration in Claude Desktop 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 via HTTP.

When you open Claude, a browser window should open and allow you to log in. You should see available tools in the bottom right corner. As prompted, Claude should call the MCP addition tool to answer questions.

📦 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

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 your Worker's workers.dev URL (e.g., worker-name.account-name.workers.dev/sse) as the MCP server address and click "Connect".

You've 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"
      ]
    }
  }
}