README.md•2.46 kB
# Remote MCP Server on Cloudflare
Let's get a remote MCP server up-and-running on Cloudflare Workers complete with OAuth login!
## Develop locally
```bash
# 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/`](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](https://modelcontextprotocol.io/docs/tools/inspector).
- Start it with `npx @modelcontextprotocol/inspector`
- [Within the inspector](http://localhost:5173), switch the Transport Type to `SSE` and enter `http://localhost:8787/sse` as 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
<div align="center">
<img src="img/mcp-inspector-sse-config.png" alt="MCP Inspector with the above config" width="600"/>
</div>
<div align="center">
<img src="img/mcp-inspector-successful-tool-call.png" alt="MCP Inspector with after a tool call" width="600"/>
</div>
## Connect Claude Desktop to your local MCP server
```json
{
"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.
```bash
npx mcp-remote http://localhost:8787/sse
```
In some rare cases it may help to clear the files added to `~/.mcp-auth`
```bash
rm -rf ~/.mcp-auth
```