Antigravity CLI

Antigravity CLI supports remote MCP servers with custom headers or automatic OAuth. A Bearer token is recommended for an ongoing connection.

Recommended: Bearer token

Create or copy your Plushcap API key from your account. Add Plushcap to the global ~/.gemini/config/mcp_config.json or the workspace .agents/mcp_config.json:

{
  "mcpServers": {
    "plushcap": {
      "serverUrl": "https://mcp.plushcap.com/mcp",
      "headers": {
        "Authorization": "Bearer your-api-key-here"
      }
    }
  }
}

Antigravity requires serverUrl for remote connections; legacy url and httpUrl fields are not supported. Because the documented configuration stores the header value, protect the file, never commit it, and regenerate the key if it is exposed.

OAuth quick start

For automatic OAuth discovery, omit the headers:

{
  "mcpServers": {
    "plushcap": {
      "serverUrl": "https://mcp.plushcap.com/mcp"
    }
  }
}

Open Antigravity settings, select Authenticate beside Plushcap, complete the browser flow, and return the authorization code if prompted.

Verify

Start Antigravity CLI and run /mcp. Reload the configuration if Plushcap does not appear, then ask:

Use Plushcap to find recent engineering content about developer tooling.

Official documentation

• Antigravity MCP documentation

Last verified: July 29, 2026.