| name | nano-banana-image-generator |
| description | Generate images using Google's Nano Banana (Gemini 2.5 Flash Image). Use when creating infographics, diagrams, thumbnails, social media graphics, or any AI-generated images. Costs $0.039/image. |
| allowed-tools | Bash, Read, Write |
Nano Banana Image Generator
Generate images using Google's Gemini 2.5 Flash Image model (codename: Nano Banana).
State Dependencies
| Source | Location | Read | Write | Description |
|---|
| Generate Script | ~/.claude/skills/nano-banana-image-generator/scripts/generate.sh | ✓ | | Main generation script |
| Thumbnail Script | ~/.claude/skills/nano-banana-image-generator/scripts/generate_thumbnail.py | ✓ | | 16:9 thumbnail generator |
| Image Script | ~/.claude/skills/nano-banana-image-generator/scripts/generate_image.py | ✓ | | Python with aspect ratio control |
| Best Practices | ~/.claude/skills/nano-banana-image-generator/best_practices.md | ✓ | | Prompt engineering guidelines |
| API Key | $GOOGLE_API_KEY or $GEMINI_API_KEY | ✓ | | Required for API access |
| Output Directory | $OUTPUT_DIR or current directory | | ✓ | Where images are saved |
| Generated Image | User-specified path | | ✓ | Output PNG file |
Quick Start
Generate a simple image:
bash ~/.claude/skills/nano-banana-image-generator/scripts/generate.sh "A red apple on white background" apple.png
Generate a 16:9 thumbnail:
python3 ~/.claude/skills/nano-banana-image-generator/scripts/generate_thumbnail.py "YouTube thumbnail showing AI agents" /tmp/thumb.png
Generate with custom output directory:
OUTPUT_DIR=/tmp bash ~/.claude/skills/nano-banana-image-generator/scripts/generate.sh "Sunset over mountains" sunset.png
Scripts
| Script | Purpose | Output |
|---|
scripts/generate.sh | General image generation | 1024x1024 PNG |
scripts/generate_thumbnail.py | 16:9 thumbnails | 1344x768 PNG |
scripts/generate_image.py | Python with aspect ratio control | Configurable |
Pricing & Limits
- Cost: $0.039 per image
- Free tier: 500 requests/day
- Generation time: ~22 seconds
- Resolution: 1024x1024 (square), 1344x768 (16:9)
Best Practices
For detailed prompt engineering and brand styling guidelines, see best_practices.md.
Critical Constraints
| Element | Maximum |
|---|
| Visual boxes/shapes | 10 maximum |
| Text pieces/labels | 10 maximum |
| Hierarchy levels | 3 maximum |
Prompt Structure
DO: Write narrative descriptions
Create a simple infographic with black background showing a central concept
with 4-5 supporting elements. Use white text, DM Sans font, bold titles.
DON'T: Use keyword lists
LinkedIn post, gradient, red, white, large text, 15 boxes, arrows everywhere
Brand Styling (the user's)
Include in prompts for brand consistency:
Use the user's brand style: black background (#000000), white text (#ffffff),
DM Sans font, bold 700 weight for titles, clean minimal design.
Use Cases
Perfect For:
- Social media infographics and carousels
- YouTube thumbnails
- Diagrams and technical documentation
- Product mockups
- Mobile-optimized content
Not Ideal For:
- Hyper-realistic photography
- Complex multi-font typography
- Fine detail technical renders
Environment Variables
GOOGLE_API_KEY or GEMINI_API_KEY - API key (required)OUTPUT_DIR - Output directory (default: current directory)
Examples
Infographic:
bash scripts/generate.sh "Simple framework diagram with black background. CENTER: 'AI Agents' in large white text. SURROUNDING: 4 icons for Planning, Memory, Tools, Learning. DM Sans font, minimal design." agents_framework.png
Thumbnail:
python3 scripts/generate_thumbnail.py "Professional YouTube thumbnail: bold white text 'DEEP AGENTS' on dramatic black background with subtle blue glow, tech aesthetic" deep_agents_thumb.png
Completion Checklist
