nano-banana-antigravity – OpenClaw Skill

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name: nano-banana-antigravity description: Generate or edit images via Nano Banana Pro using Antigravity OAuth (no API key needed!) homepage: https://antigravity.google metadata: {"openclaw":{"emoji":"🍌","requires":{"bins":["uv"]}}}

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

🍌 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.

Features

• ✅ Uses existing OpenClaw Antigravity OAuth tokens
• ✅ No separate Gemini API key required
• ✅ Supports Nano Banana Pro (with fallback to regular Nano Banana)
• ✅ WhatsApp HD ready - auto-converts to progressive JPEG <6.28MB
• ✅ Multiple aspect ratios: 1:1, 16:9, 9:16, 4:3, 3:4, etc.
• ✅ Multiple resolutions: 1K, 2K, 4K
• ✅ Image editing and multi-image composition
• ✅ Automatic account rotation (12 Antigravity accounts)

Prerequisites

• OpenClaw with google-antigravity-auth plugin enabled
• Authenticated Antigravity account: openclaw models auth login --provider google-antigravity
• uv (Python package runner): brew install uv

Usage

Generate Image (WhatsApp HD - Recommended)

./skills/nano-banana-antigravity/scripts/generate_whatsapp_hd.sh \
  --prompt "a sunset over mountains" \
  --filename "sunset.jpg" \
  --aspect-ratio 16:9 \
  --resolution 4K

What it does:

• Generates 4K image via Nano Banana Pro
• Auto-converts PNG → progressive JPEG
• Optimizes quality to stay under 6.28MB
• WhatsApp HD ready (no compression!)

Generate PNG (Standard)

uv run skills/nano-banana-antigravity/scripts/generate_image.py \
  --prompt "a futuristic city skyline" \
  --filename "city.png" \
  --aspect-ratio 16:9 \
  --resolution 2K

Edit Image

uv run skills/nano-banana-antigravity/scripts/generate_image.py \
  --prompt "add sunglasses to this person" \
  --filename "edited.png" \
  -i original.png

Multi-image Composition

uv run skills/nano-banana-antigravity/scripts/generate_image.py \
  --prompt "combine these into one scene" \
  --filename "composite.png" \
  -i image1.png -i image2.png

Options

Option	Short	Description	Default
--prompt	-p	Image description (required)	-
--filename	-f	Output filename (required)	-
--input-image	-i	Input image for editing (repeatable)	-
--aspect-ratio	-a	Aspect ratio	1:1
--resolution	-r	Resolution (1K, 2K, 4K)	1K

Supported Aspect Ratios

1:1, 2:3, 3:2, 3:4, 4:3, 4:5, 5:4, 9:16, 16:9, 21:9

How It Works

This skill uses the same CloudCode API that powers Google Antigravity's built-in image generation. It reads your existing OAuth refresh tokens from OpenClaw's auth-profiles and uses them to call the Gemini 3 Pro Image model.

License

MIT