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Zhongwei Li
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skills/gemini-nano-banana-tool/SKILL.md
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skills/gemini-nano-banana-tool/SKILL.md
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# Gemini Nano Banana Tool Skill
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Professional CLI for Google Gemini image generation with AI-powered prompt optimization, cost tracking, and multi-turn conversations.
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## Quick Reference
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```bash
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# AI prompt optimization
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gemini-nano-banana-tool promptgen "simple description"
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# Generate image (both commands work)
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gemini-nano-banana-tool generate "detailed prompt" -o output.png
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gemini-nano-banana-tool generate-image "detailed prompt" -o output.png
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# Multi-turn refinement
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gemini-nano-banana-tool generate-conversation "prompt" -o output.png -f conv.json
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# Discovery
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gemini-nano-banana-tool list-models
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gemini-nano-banana-tool list-aspect-ratios
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```
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## Core Capabilities
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### 1. AI Prompt Generation
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Transform simple descriptions into detailed, optimized prompts:
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```bash
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# Basic usage
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gemini-nano-banana-tool promptgen "wizard cat"
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# With template for specialized prompts
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gemini-nano-banana-tool promptgen "wizard cat" --template character
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# Pipeline: optimize then generate
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gemini-nano-banana-tool promptgen "cyberpunk city" --template scene | \
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gemini-nano-banana-tool generate -o city.png --stdin -a 16:9
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```
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**Available Templates**:
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- `photography` - Technical camera details, lighting
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- `character` - Pose, attire, expression
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- `scene` - Foreground/midground/background
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- `food` - Plating, garnish, lighting
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- `abstract` - Shapes, colors, patterns
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- `logo` - Typography, symbolism
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### 2. Text-to-Image Generation
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Generate images from prompts with flexible input (use `generate` or `generate-image` interchangeably):
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```bash
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# From positional argument (both commands work)
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gemini-nano-banana-tool generate "A cat wearing a wizard hat" -o cat.png
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gemini-nano-banana-tool generate-image "A cat wearing a wizard hat" -o cat.png
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# From file
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gemini-nano-banana-tool generate -f prompt.txt -o output.png
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# From stdin (piping)
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echo "Beautiful sunset" | gemini-nano-banana-tool generate -o sunset.png -s
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```
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### 3. Image Editing with References
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Edit existing images using natural language:
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```bash
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# Single reference
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gemini-nano-banana-tool generate "Add a birthday hat" -o edited.png -i photo.jpg
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# Multiple references (up to 3 for Flash, 14 for Pro)
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gemini-nano-banana-tool generate "Combine these elements" -o result.png \
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-i ref1.jpg -i ref2.jpg -i ref3.jpg
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```
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### 4. Multi-Turn Conversations
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Progressive image refinement across multiple turns:
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```bash
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# Turn 1: Initial image
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gemini-nano-banana-tool generate-conversation \
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"Modern living room with large windows" \
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-o room-v1.png -f interior.json -a 16:9
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# Turn 2: Add furniture (previous image auto-referenced)
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gemini-nano-banana-tool generate-conversation \
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"Add gray sofa and wooden coffee table" \
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-o room-v2.png -f interior.json
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# Turn 3: Adjust lighting
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gemini-nano-banana-tool generate-conversation \
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"Make lighting warmer, add floor lamp" \
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-o room-v3.png -f interior.json
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```
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### 5. Aspect Ratios
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10 supported aspect ratios for different platforms:
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```bash
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# Square (Instagram post)
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gemini-nano-banana-tool generate "Design" -o square.png -a 1:1
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# Widescreen (YouTube thumbnail)
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gemini-nano-banana-tool generate "Scene" -o wide.png -a 16:9
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# Vertical (Instagram story)
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gemini-nano-banana-tool generate "Portrait" -o vertical.png -a 9:16
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# Cinematic (ultra-wide)
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gemini-nano-banana-tool generate "Panorama" -o cinema.png -a 21:9
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```
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**All Ratios**: 1:1, 16:9, 9:16, 4:3, 3:4, 3:2, 2:3, 21:9, 4:5, 5:4
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### 6. Model Selection
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Choose between Flash (fast, cost-effective) and Pro (high quality):
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```bash
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# Flash model (default) - Fast, cost-effective
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gemini-nano-banana-tool generate "Prompt" -o output.png
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# Pro model - Higher quality
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gemini-nano-banana-tool generate "Prompt" -o output.png \
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-m gemini-3-pro-image-preview
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# Pro with 4K resolution - Maximum quality
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gemini-nano-banana-tool generate "Prompt" -o output.png \
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-m gemini-3-pro-image-preview -r 4K
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```
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### 7. Cost Tracking
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Automatic cost calculation based on actual token usage:
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```json
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{
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"output_path": "output.png",
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"model": "gemini-2.5-flash-image",
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"token_count": 1295,
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"estimated_cost_usd": 0.0389,
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"resolution": "1344x768"
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}
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```
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**Typical Costs**:
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- Flash: ~$0.039 per image
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- Pro 1K/2K: ~$0.134 per image
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- Pro 4K: ~$0.24 per image
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### 8. Verbosity Levels
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Multi-level logging for debugging:
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```bash
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# Normal (warnings only)
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gemini-nano-banana-tool generate "test" -o output.png
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# Info (-v) - High-level operations
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gemini-nano-banana-tool generate "test" -o output.png -v
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# Debug (-vv) - Detailed validation
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gemini-nano-banana-tool generate "test" -o output.png -vv
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# Trace (-vvv) - Full HTTP logs
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gemini-nano-banana-tool generate "test" -o output.png -vvv
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```
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## Authentication
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### Gemini Developer API (Recommended)
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```bash
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export GEMINI_API_KEY='your-api-key'
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```
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Get API key: https://aistudio.google.com/app/apikey
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### Vertex AI (Enterprise)
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```bash
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export GOOGLE_GENAI_USE_VERTEXAI=true
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export GOOGLE_CLOUD_PROJECT='your-project-id'
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export GOOGLE_CLOUD_LOCATION='us-central1'
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# Authenticate
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gcloud auth application-default login
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```
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## Common Workflows
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### Workflow 1: Quick Generation
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```bash
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# Optimize prompt and generate in one pipeline
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gemini-nano-banana-tool promptgen "wizard in magical library" | \
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gemini-nano-banana-tool generate -o wizard.png -s -a 16:9
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```
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### Workflow 2: Batch Processing
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```bash
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# Generate multiple variations
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for style in "photorealistic" "artistic" "minimalist"; do
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gemini-nano-banana-tool generate \
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"A cat in $style style" \
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-o "cat-$style.png" \
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-a 1:1
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done
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```
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### Workflow 3: Progressive Refinement
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```bash
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# Generate base image
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gemini-nano-banana-tool generate "Product photo of headphones" \
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-o product-v1.png -a 1:1
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# Refine with conversation mode
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gemini-nano-banana-tool generate-conversation \
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"Rotate to show left side" \
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-o product-v2.png -f product.json
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gemini-nano-banana-tool generate-conversation \
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"Change background to dark gradient" \
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-o product-v3.png -f product.json
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```
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### Workflow 4: Template-Based Generation
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```bash
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# Generate food photography
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gemini-nano-banana-tool promptgen "pasta carbonara" --template food \
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-o pasta-prompt.txt
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# Use saved prompt
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gemini-nano-banana-tool generate -f pasta-prompt.txt \
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-o pasta.png -a 4:3
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# Generate character design
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gemini-nano-banana-tool promptgen "space explorer" --template character | \
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gemini-nano-banana-tool generate -o explorer.png -s -a 2:3
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```
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## Use Cases
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### Content Creation
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- Social media posts and stories
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- Marketing materials and ads
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- Blog post illustrations
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- YouTube thumbnails
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### E-commerce
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- Product photography variations
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- Lifestyle product shots
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- Fashion combinations
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- Product on model composites
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### Design & Prototyping
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- Concept art exploration
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- UI/UX mockups
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- Logo design iterations
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- Brand visual exploration
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### Professional Assets
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- High-quality 4K renders
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- Professional photography
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- Print-ready materials
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- Commercial content
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## Output Format
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All commands return structured JSON:
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```json
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{
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"output_path": "output.png",
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"model": "gemini-2.5-flash-image",
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"aspect_ratio": "16:9",
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"resolution": "1344x768",
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"resolution_quality": "1K",
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"reference_image_count": 0,
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"token_count": 1295,
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"estimated_cost_usd": 0.0389,
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"metadata": {
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"finish_reason": "STOP",
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"safety_ratings": null
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}
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}
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```
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## Error Handling
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The tool provides actionable error messages:
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```bash
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# Missing API key
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Error: API key required. Set GEMINI_API_KEY or use --api-key option.
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Get API key from https://aistudio.google.com/app/apikey
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# Too many reference images
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Error: Maximum 3 reference images allowed (Flash model).
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Use Pro model for up to 14 reference images.
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# Invalid aspect ratio
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Error: Invalid aspect ratio '16:10'.
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Use 'gemini-nano-banana-tool list-aspect-ratios' to see supported ratios.
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```
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## Shell Completion
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Enable tab completion for faster usage:
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```bash
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# Bash
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eval "$(gemini-nano-banana-tool completion bash)"
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# Zsh
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eval "$(gemini-nano-banana-tool completion zsh)"
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# Fish
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gemini-nano-banana-tool completion fish > \
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~/.config/fish/completions/gemini-nano-banana-tool.fish
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```
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## Cost Optimization
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### Choose the Right Model
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**Use Flash for**:
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- Prototyping and testing
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- High-volume generation
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- Cost-sensitive projects
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- Quick iterations
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**Use Pro for**:
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- Final production images
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- Complex scenes with detail
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- Professional/commercial work
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- Higher resolution needs
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### Optimize Prompts
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```bash
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# Use promptgen to reduce trial-and-error
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gemini-nano-banana-tool promptgen "your idea" --template photography \
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-o prompt.txt
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# Reuse successful prompts
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gemini-nano-banana-tool generate -f prompt.txt -o v1.png -a 1:1
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gemini-nano-banana-tool generate -f prompt.txt -o v2.png -a 16:9
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```
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### Use Conversation Mode
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```bash
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# Refine instead of regenerating from scratch
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gemini-nano-banana-tool generate-conversation \
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"Initial prompt" -o v1.png -f conv.json
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gemini-nano-banana-tool generate-conversation \
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"Small adjustment" -o v2.png -f conv.json
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```
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## Library Usage
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Import and use programmatically:
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```python
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from gemini_nano_banana_tool import create_client, generate_image, generate_prompt
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# Create client (reuse for multiple operations)
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client = create_client()
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# Generate optimized prompt
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prompt_result = generate_prompt(
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client=client,
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description="wizard cat",
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template="character"
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)
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# Generate image
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image_result = generate_image(
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client=client,
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prompt=prompt_result['prompt'],
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output_path="wizard-cat.png",
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aspect_ratio="16:9"
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)
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print(f"Cost: ${image_result['estimated_cost_usd']:.4f}")
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```
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## Resources
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- **Documentation**: README.md and CLAUDE.md in project root
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- **API Setup**: references/api-setup-pricing.md
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- **Prompting Guide**: references/prompting-guide.md (if available)
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- **Examples**: references/examples.md (if available)
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- **Official Gemini Docs**: https://ai.google.dev/gemini-api/docs/image-generation
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- **API Key**: https://aistudio.google.com/app/apikey
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## Installation
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```bash
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# Clone repository
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git clone https://github.com/dnvriend/gemini-nano-banana-tool.git
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cd gemini-nano-banana-tool
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# Install with uv
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uv tool install .
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# Verify
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gemini-nano-banana-tool --version
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gemini-nano-banana-tool --help
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```
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## Support
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For issues or questions:
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- GitHub Issues: https://github.com/dnvriend/gemini-nano-banana-tool/issues
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- Documentation: Check README.md and CLAUDE.md
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- API Documentation: https://ai.google.dev/gemini-api/docs
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---
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**Generated with Claude Code**
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This skill provides comprehensive access to Google Gemini's image generation capabilities through a professional, agent-friendly CLI with automatic cost tracking, AI prompt optimization, and multi-turn conversation support.
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