Remote MCP Server On Cloudflare 9qz

🚀 Running a Remote MCP Server on Cloudflare

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

🚀 Quick Start

📦 Installation

# 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/.

💻 Usage Examples

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.
• In the inspector, switch the transport type to SSE, enter http://localhost:8787/sse in the URL to connect to the MCP server, and then click "Connect".
• You will be redirected to a (simulated) user/password login screen. Enter any email and password to log in.
• After successful login, you should be redirected back to the MCP inspector, and you can list and call any defined tools!

Connecting Claude Desktop to Your Local MCP Server

The MCP inspector is nice, but what we really want to do is connect it 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 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 via HTTP.

When opening Claude, a browser window should open and allow you to log in. You should see a list of available tools in the bottom right corner. As prompted, Claude may request to call a tool.

🚀 Deployment

Deploying 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 Deployed Server

Just like in "Local Development", 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 URL of the MCP server and click "Connect".

You have successfully connected the MCP server from 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., worker-name.account-name.workers.dev/sse), and 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 directly connecting to your MCP server via the following command may help.

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

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

rm -rf ~/.mcp