opencode-antigravity-img

OpenCode plugin for generating images using Gemini 3 Pro Image model via Google's Antigravity/CloudCode API.

Requirements

• OpenCode installed
• Google One AI Premium subscription
• Authentication via opencode-antigravity-auth plugin

Installation

1. First, install and configure the authentication plugin:

# Add to your opencode.json
"plugin": [
  "opencode-antigravity-auth",
  "opencode-antigravity-img"
]

2. Run the auth plugin to authenticate with your Google account:

opencode
# Use the authenticate command from antigravity-auth

This creates antigravity-accounts.json in your opencode config directory.

Tools

generate_image

Generate an image from a text prompt.

Arguments:

• prompt (required): Text description of the image to generate
• filename (optional): Output filename (default: generated_<timestamp>.jpg)
• output_dir (optional): Output directory (default: current working directory)
• aspect_ratio (optional): Image aspect ratio. Supported values: 1:1, 2:3, 3:2, 3:4, 4:3, 4:5, 5:4, 9:16, 16:9, 21:9 (default: 1:1)
• image_size (optional): Image resolution. Supported values: 1K, 2K, 4K (default: 1K)

Example:

Generate a 16:9 landscape image of a sunset over mountains with a lake in the foreground

Output:

• Image file saved to specified path
• Returns path, size, format, and remaining quota

image_quota

Check the remaining quota for the Gemini 3 Pro Image model.

Arguments: None

Output:

• Visual progress bar showing remaining quota percentage
• Time until quota resets

Image Details

• Model: Gemini 3 Pro Image
• Resolutions:
  • 1K: 1024x1024 (default)
  • 2K: 2048x2048
  • 4K: 4096x4096
• Aspect ratios: 1:1, 2:3, 3:2, 3:4, 4:3, 4:5, 5:4, 9:16, 16:9, 21:9
• Format: JPEG (always, regardless of filename extension)
• Generation time: 10-30 seconds

Unsupported Parameters

The following parameters are documented in Google's API but are not supported by the Gemini 3 Pro Image model (they are Imagen-specific):

• personGeneration - Control generation of people in images
• outputMimeType - Output format selection (always returns JPEG)
• compressionQuality - JPEG compression control

These parameters may work with Imagen models but have no effect with Gemini 3 Pro Image.

Quota

Image generation uses a separate quota from text models. The quota resets every 5 hours. Use the image_quota tool to check your remaining quota.

Troubleshooting

"No Antigravity account found"

Make sure you've:

1. Installed opencode-antigravity-auth
2. Authenticated with your Google account
3. The credentials file antigravity-accounts.json exists in your opencode config directory

"Rate limited" or generation fails

• Wait a few seconds and try again
• Check your quota with image_quota
• The plugin automatically tries multiple endpoints

Slow generation

Image generation typically takes 10-30 seconds. This is normal due to the complexity of image synthesis.

API Endpoints

The plugin uses Google's CloudCode API with fallback endpoints:

1. https://daily-cloudcode-pa.googleapis.com (primary)
2. https://daily-cloudcode-pa.sandbox.googleapis.com (fallback)
3. https://cloudcode-pa.googleapis.com (production)

Related Plugins

• opencode-antigravity-auth - Authentication (required)
• opencode-antigravity-quota - Text model quota checking

License

MIT