sentry-mcp

This is a prototype of a remote MCP sever, acting as a middleware to the upstream Sentry API provider.

It is based on Cloudflare’s work towards remote MCPs.

Getting Started

You’ll find everything you need to know by visiting the deployed service in production:

https://mcp.sentry.dev

If you’re looking to contribute, learn how it works, or to run this for self-hosted Sentry, continue below…

Stdio vs Remote

While this repository is focused on acting as an MCP service, we also support a stdio transport. This is still a work in progress, but is the easiest way to adapt run the MCP against a self-hosted Sentry install.

To utilize the stdout transport, you’ll need to create an Personal API Token (PAT) in Sentry with the necessary scopes. As of writing this is:

org:read
project:read
project:write
team:read
team:write
event:read

Clone the repository and set it up as you normally would:

pnpm install
pnpm build

Launch the transport:

pnpm run --filter ./packages/mcp-server start --access-token=sentry-pat --host=sentry.example.com

Note: You can also use environment variables:

SENTRY_AUTH_TOKEN=
SENTRY_HOST=

MCP Inspector

MCP includes an Inspector, to easily test the service:

pnpm inspector

Enter https://[domain].workers.dev/sse (TODO) and hit connect. Once you go through the authentication flow, you’ll see the Tools working:

Access the remote MCP server from Claude Desktop

Open Claude Desktop and navigate to Settings, press ⌘ + , (comma) -> Developer -> Edit Config. This opens the configuration file that controls which MCP servers Claude can access.

Replace the content with the following configuration. Once you restart Claude Desktop, a browser window will open showing your OAuth login page. Complete the authentication flow to grant Claude access to your MCP server. After you grant access, the tools will become available for you to use.

{
  "mcpServers": {
    "math": {
      "command": "npx",
      "args": [
        "mcp-remote",
        "https://mcp-github-oauth.<your-subdomain>.workers.dev/sse"
      ]
    }
  }
}

Once the Tools (under 🔨) show up in the interface, you can ask Claude to use them. For example: “Could you use the math tool to add 23 and 19?”. Claude should invoke the tool and show the result generated by the MCP server.

Local Development

If you’d like to iterate and test your MCP server, you can do so in local development. This will require you to create another OAuth App in Sentry (Settings => API => Applications):

• For the Homepage URL, specify http://localhost:8788
• For the Authorized Redirect URIs, specify http://localhost:8788/callback
• Note your Client ID and generate a Client secret.
• Create a .dev.vars file in your project root with:

SENTRY_CLIENT_ID=your_development_sentry_client_id
SENTRY_CLIENT_SECRET=your_development_sentry_client_secret

Verify

Run the server locally to make it available at http://localhost:8788

pnpm dev

To test the local server, enter http://localhost:8788/sse into Inspector and hit connect. Once you follow the prompts, you’ll be able to “List Tools”.

Tests

There are two test suites included: basic unit tests, and some evaluations.

Unit tests can be run using:

pnpm test

Evals will require a .env file with some config:

OPENAI_API_KEY=

Once thats done you can run them using:

pnpm test

Notes

Using Claude and other MCP Clients

When using Claude to connect to your remote MCP server, you may see some error messages. This is because Claude Desktop doesn’t yet support remote MCP servers, so it sometimes gets confused. To verify whether the MCP server is connected, hover over the 🔨 icon in the bottom right corner of Claude’s interface. You should see your tools available there.

Using Cursor and other MCP Clients

To connect Cursor with your MCP server, choose Type: “Command” and in the Command field, combine the command and args fields into one (e.g. npx mcp-remote https://<your-worker-name>.<your-subdomain>.workers.dev/sse).

Note that while Cursor supports HTTP+SSE servers, it doesn’t support authentication, so you still need to use mcp-remote (and to use a STDIO server, not an HTTP one).

You can connect your MCP server to other MCP clients like Windsurf by opening the client’s configuration file, adding the same JSON that was used for the Claude setup, and restarting the MCP client.