Use Zetlyn in Cursor and other MCP clients

Add an MCP server with the URL https://zetlyn.com/mcp. In Cursor that is an entry in mcp.json:

{
  "mcpServers": {
    "zetlyn": { "url": "https://zetlyn.com/mcp" }
  }
}

The client finds out how to sign in (OAuth with dynamic client registration and PKCE) and opens Zetlyn's sign-in in your browser. VS Code and other MCP clients work the same way: the address is all they need.

With a key instead

Where a client cannot sign in, make an API key under Account, API keys and send it as a header:

{
  "mcpServers": {
    "zetlyn": {
      "type": "http",
      "url": "https://zetlyn.com/mcp",
      "headers": { "Authorization": "Bearer zk_…" }
    }
  }
}

Keep the key out of anything you commit.

What to ask

• "Tell me when a new version of this dependency is released."
• "Watch tag_name on this API and send it to my webhook when it changes."
• "What changed on my watches since yesterday?"

Claude · ChatGPT · All use cases