Connect Antigravity

Connect Google's Antigravity so its agent can design directly on your Brilliant canvas.

Prerequisites

• Antigravity 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 Antigravity row on.

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

Brilliant writes a brilliant server into ~/.gemini/antigravity/mcp_config.json. Restart Antigravity so it loads the server.

By hand

Antigravity uses a serverUrl key:

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

Use 3334 or 3335 if Brilliant reported a fallback port.

Try it

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

• In Brilliant, build a product page with a gallery and an add-to-cart panel.

• Read my selection in Brilliant and generate a matching empty-state illustration.

• Lay out a four-step wizard in Brilliant, each step in its own frame.

Antigravity's agent building a design in Brilliant (screenshot coming soon)

Troubleshooting

• Antigravity doesn't see the brilliant tools. Restart it; MCP servers load at launch.

• Calls fail. Brilliant must be running. Launch it and retry.

• Port mismatch. If Brilliant is on 3334 or 3335, re-toggle the Antigravity row in Settings to rewrite the address, then restart Antigravity.

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