Remote MCP Server on Cloudflare
Let's get a remote MCP server up-and-running on Cloudflare Workers complete with OAuth login!
Develop locally
# 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-bearer-auth
You should be able to open http://localhost:8787/ in your browser
Connect the MCP inspector to your server
To explore your new MCP api, you can use the MCP Inspector.
- Start it with
npx @modelcontextprotocol/inspector - Within the inspector, switch the Transport Type to
SSEand enterhttp://localhost:8787/sseas the URL of the MCP server to connect to. - Add a bearer token and click "Connect"
- Click "List Tools"
- Run the "getToken" tool, which should return the Authorization header that you set in the inspector
Connect Claude Desktop to your local MCP server
{
"mcpServers": {
"remote-mcp-server-bearer-auth": {
"command": "npx",
"args": [
"mcp-remote",
"http://localhost:8787/sse",
"--header",
"Authorization: Bearer ${AUTH_TOKEN}"
]
},
"env": {
"AUTH_TOKEN": "..."
}
}
}
Deploy to Cloudflare
npm run deploy
Call your newly deployed remote MCP server from a remote MCP client
Just like you did above in "Develop locally", run the MCP inspector:
npx @modelcontextprotocol/inspector@latest
Then enter the workers.dev URL (ex: worker-name.account-name.workers.dev/sse) of your Worker in the inspector as the URL of the MCP server to connect to, and click "Connect".
You've now connected to your MCP server from a remote MCP client. You can pass in a bearer token like mentioned above
Debugging
Should anything go wrong it can be helpful to restart Claude, or to try connecting directly to your MCP server on the command line with the following command.
npx mcp-remote http://localhost:8787/sse
In some rare cases it may help to clear the files added to ~/.mcp-auth
rm -rf ~/.mcp-auth