Setup steps checked Nov 2026.

Your ad accounts, inside Antigravity

Install

Add this to ~/.gemini/config/mcp_config.json (for one workspace: .agents/mcp_config.json):

{ "mcpServers": { "oam": { "serverUrl": "https://mcp.openadmanager.com/mcp" } } }

It is serverUrl, not httpUrl. That is the opposite of Gemini CLI.

Antigravity then opens the OpenAdManager sign-in. Click Allow. Its redirect address is https://antigravity.google/oauth-callback.

Check it worked

Use OpenAdManager: list my ad accounts.

If something goes wrong

• No sign-in window. Check that the key is serverUrl.
• "Not done. ... is turned off in AI permissions". That is your switches working. Open the link in the message, or Add to your AI in the menu, and turn it on if you want it.