Connect Cursor

Wire Cursor's agent into Brilliant so it can build and edit designs on your canvas while you stay in the editor you already live in.

Prerequisites

• Cursor installed.

• Brilliant open. The MCP server only runs while the app is running.

Setup

1. Open Settings (Cmd+,) in Brilliant and pick MCP Connections.

2. Flip the Cursor row on.

The MCP Connections list with the Cursor row toggled on (screenshot coming soon)

Brilliant writes a brilliant server entry into ~/.cursor/mcp.json, leaving any other servers untouched. Restart Cursor so it loads the new server.

By hand

If you prefer to edit ~/.cursor/mcp.json yourself:

{
  "mcpServers": {
    "brilliant": {
      "url": "http://127.0.0.1:3333/mcp"
    }
  }
}

Use 3334 or 3335 if Brilliant fell back to those ports on startup.

Try it

Ask Cursor's agent to design, with Brilliant open:

• In Brilliant, design a settings page with a sidebar and a form.

• Read my current selection in Brilliant and generate three color variations of it on a new canvas.

• Build a mobile onboarding flow in Brilliant, one frame per screen.

Because you are already in a code editor, Cursor is handy for turning a spec or a component in your repo into a matching design in Brilliant.

Cursor's agent creating a design in Brilliant (screenshot coming soon)

Troubleshooting

• Cursor doesn't list the brilliant tools. Restart Cursor; it reads MCP servers at launch. Check Cursor's MCP settings panel to confirm brilliant shows as connected.

• Calls fail or hang. Brilliant must be open for the endpoint to respond. Launch it and retry.

• Port mismatch. If Brilliant is on 3334 or 3335 (because 3333 was taken), re-toggle the Cursor row in Settings to rewrite the current address, then restart Cursor.

• The row shows unchecked but the config has a brilliant entry. The entry points somewhere else. Toggle on to rewrite it to the correct local URL.