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Antigravity MCP docs You can find your Ref API key at ref.tools/keys

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Install Steps

  1. Open Agent Chat.
  2. Click the ... Additional options button and select MCP Servers
  3. Click Manage MCP Servers. This should open an editor tab called Managed MCPS
  4. Update mcp_config.json
{
  "mcpServers": {
    "ref-plan": {
      "serverUrl": "https://api.plan.ref.tools/mcp",
      "headers": {
        "x-ref-api-key": "<your-api-key>"
      }
    }
  }
}
For plan-specific mode, use "serverUrl": "https://api.plan.ref.tools/mcp?plan=<PLAN_ID>".

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Verify

Go back to the Manage MCP Servers page and hit Refresh You should see ref-plan with a green dot.

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Get help

If you have any issues, please reach out to help@ref.tools. We’re happy to help you get started!