Antigravity (Google Cloud Code Assist)

Antigravity is Google's Cloud Code Assist provider — it gives access to Claude and Gemini models via Google's infrastructure, often at no cost with generous quotas.

Prerequisites

A Google account
Google Cloud Code Assist enabled (via "Gemini for Google Cloud" onboarding)

Authentication

suprclaw auth login --provider antigravity

This opens a browser for Google OAuth. On completion, credentials are saved to ~/.suprclaw/auth.json.

Headless / VPS Authentication

If running on a server without a browser:

Run the auth command — it displays a URL
Open the URL in your local browser
Complete Google login
Your browser redirects to localhost:51121 (which fails to load)
Copy the full URL from your browser's address bar
Paste it back into the terminal where SuprClaw is waiting

Configuration

{
  "model_list": [
    {
      "model_name": "gemini-flash",
      "model": "antigravity/gemini-3-flash",
      "auth_method": "oauth"
    }
  ],
  "agents": {
    "defaults": { "model_name": "gemini-flash" }
  }
}

Available Models

suprclaw auth models

Reliable models based on testing:

Model	Description
`gemini-3-flash`	Fast, highly available
`gemini-2.5-flash-lite`	Lightweight
`claude-opus-4-6-thinking`	Powerful, includes reasoning

Use the short ID (e.g. gemini-3-flash), not the full path.

Copying Credentials to a Server

If authenticated locally, copy credentials to the server:

scp ~/.suprclaw/auth.json user@your-server:~/.suprclaw/

Troubleshooting

Issue	Fix
Empty response	Model may be restricted. Try `gemini-3-flash`
429 Rate Limit	Quota exhausted — check reset time in error message
404 Not Found	Use a model ID from `suprclaw auth models`
Token expired	Re-run `suprclaw auth login --provider antigravity`
Gemini not enabled	Enable in Google Cloud Console

Prerequisites​

Authentication​

Headless / VPS Authentication​

Configuration​

Available Models​

Copying Credentials to a Server​

Troubleshooting​