Nano Banana Pro

Nano Banana Pro (Gemini 3 Pro Image)

Generate or edit images using Gemini 3 Pro Image via AI Gateway or direct API.

Quick Start

Generate an image:

python3 {baseDir}/scripts/generate_image.py \
  --prompt "your image description" \
  --filename "output.png" \
  --resolution 1K

Usage Examples

Generate Image

python3 {baseDir}/scripts/generate_image.py \
  --prompt "a cute cat sitting on a wooden floor" \
  --filename "cat.png"

Edit Image (requires GEMINIAPIKEY)

Note: Image editing currently requires direct Gemini API access.

export GEMINI_API_KEY="your-gemini-key"
python3 {baseDir}/scripts/generate_image.py \
  --prompt "make it more colorful" \
  --filename "cat-colorful.png" \
  -i "cat.png"

Multi-image Composition (up to 14 images, requires GEMINIAPIKEY)

python3 {baseDir}/scripts/generate_image.py \
  --prompt "combine these into one scene" \
  --filename "combined.png" \
  -i img1.png -i img2.png -i img3.png

API Key Configuration

The skill automatically detects API keys in this priority order:

1. AI_GATEWAY_API_KEY (recommended) - Uses AI Gateway
2. GEMINI_API_KEY - Direct Gemini API access
3. --api-key argument - Manual key override

Recommended: AI Gateway (default)

export AI_GATEWAY_API_KEY="your-gateway-key"  # Usually pre-configured

✅ No additional dependencies required ✅ Cost-efficient and unified API management ❌ Image editing not currently supported

Alternative: Direct Gemini API

export GEMINI_API_KEY="your-gemini-key"

✅ Supports image editing and multi-image composition ❌ Requires google-genai package: pip install google-genai

Options

• --prompt, -p: Image description (required)
• --filename, -f: Output filename (required)
• --resolution, -r: Resolution (1K, 2K, 4K, default: 1K)
• --input-image, -i: Input image(s) for editing (up to 14, requires GEMINIAPIKEY)
• --api-key, -k: Manual API key override

Notes

• Resolutions: 1K (default), 2K, 4K
• Use descriptive filenames with timestamps: 2024-12-31-cat.png
• The script outputs a MEDIA: line for OpenClaw integration
• AI Gateway mode works with standard Python 3, no extra tools needed

Source & license

This open-source skill is cataloged on AgentStack and links to its original source — we do not rehost the code.

• Author: happycapy-ai
• Source: happycapy-ai/Happycapy-skills
• License: MIT

Install and usage instructions live in the source repository linked above.