Source Code

Nano Banana Antigravity (Gemini 3 Pro Image via OAuth)

Generate images using Nano Banana Pro (Gemini 3 Pro Image) via your existing Google Antigravity OAuth credentials.

No separate API key needed! Uses the same OAuth tokens as your OpenClaw Antigravity provider.

Generate Image

For WhatsApp HD (recommended):

{baseDir}/scripts/generate_whatsapp_hd.sh \
  --prompt "your image description" \
  --filename "output.jpg" \
  --aspect-ratio 16:9 \
  --resolution 4K

Standard PNG output:

uv run {baseDir}/scripts/generate_image.py --prompt "your image description" --filename "output.png"

Generate with Options

{baseDir}/scripts/generate_whatsapp_hd.sh \
  --prompt "a sunset over mountains" \
  --filename "sunset.jpg" \
  --aspect-ratio 16:9 \
  --resolution 4K

What generate_whatsapp_hd.sh does:

✅ Auto-converts PNG → progressive JPEG
✅ Optimizes quality (85-92%) to stay under 6.28MB
✅ WhatsApp HD ready (no compression!)
✅ Warns if image is too large

Edit/Composite Images

uv run {baseDir}/scripts/generate_image.py \
  --prompt "add sunglasses to this person" \
  --filename "edited.png" \
  -i original.png

Multi-image Composition

uv run {baseDir}/scripts/generate_image.py \
  --prompt "combine these into one scene" \
  --filename "composite.png" \
  -i image1.png -i image2.png -i image3.png

Options

--prompt, -p (required): Image description or edit instructions
--filename, -f (required): Output filename
--input-image, -i: Input image(s) for editing (can be repeated)
--aspect-ratio, -a: 1:1 (default), 2:3, 3:2, 3:4, 4:3, 4:5, 5:4, 9:16, 16:9, 21:9
--resolution, -r: 1K, 2K (default), 4K

Authentication

Uses existing OpenClaw Antigravity OAuth credentials. Make sure you're authenticated:

openclaw models auth login --provider google-antigravity

The script looks for credentials in:

~/.openclaw/credentials/google-antigravity.json
~/.config/openclaw/credentials/google-antigravity.json
~/.config/opencode/antigravity-accounts.json

WhatsApp HD Upload Limits

For best WhatsApp HD quality:

Use generate_whatsapp_hd.sh instead of generate_image.py
Output filename must end in .jpg or .jpeg
Images ≤6.28MB will upload without compression
Images >6.28MB may be compressed by WhatsApp

Size guidelines:

≤6.28MB → ✅ HD (no compression)
6.29-6.5MB → Slight compression (~5.7MB)
6.5-7.6MB → Moderate compression (~6.2MB)
9MB → ⚠️ Heavy compression

Notes

The script prints a MEDIA: line for OpenClaw to auto-attach on supported chat providers.
Do not read the image back; report the saved path only.
Uses timestamps in filenames for uniqueness: yyyy-mm-dd-hh-mm-ss-name.png
Falls back to regular Nano Banana if Nano Banana Pro isn't available yet.
Account rotation: Automatically tries all 12 Antigravity accounts on rate limits

nano-banana-antigravity