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name: nano-banana description: Generate images using Google's Nano-Banana (Gemini 2.5 Flash Image) model. Use when the user asks to generate, create, or make an image, picture, or illustration. allowed-tools: Read, Bash

Nano-Banana Image Generation

Generate images using Google's Gemini Image models.

IMPORTANT: Enhance User Prompts

Before generating, always enhance the user's prompt using the techniques in PROMPTING.md.

Quick Enhancement Formula

[Subject] + [Style] + [Lighting] + [Composition] + [Quality]

Example Enhancement

• User says: "a cat"
• Enhanced: "A fluffy orange tabby cat with bright green eyes, photorealistic, soft natural window lighting, shallow depth of field, rule of thirds composition"

For detailed prompting techniques, templates, and style keywords, see PROMPTING.md.

Quick Start

Copy~/.claude/skills/nano-banana/scripts/generate.sh "your prompt here"

Options

Aspect Ratios

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

Resolutions

• 1K - Standard (default, fast)
• 2K - High resolution (requires Pro model)
• 4K - Maximum resolution (requires Pro model)

Interpreting User Requests

Parse the user's request and map to script options:

Keywords to watch for:

• Resolution: "4K", "high res", "high resolution", "2K", "large" → use --size
• Quality: "high quality", "detailed", "professional" → use --pro
• Orientation: "landscape", "widescreen", "wallpaper" → --aspect 16:9
• Orientation: "portrait", "vertical", "phone wallpaper" → --aspect 9:16
• Save location: "save to", "put it in", "output to" → --output

Behavior

• Runs in background (won't block Claude)
• Sends macOS notification when complete
• Auto-opens the image when done
• Images saved to ~/Pictures/nano-banana/ by default

Troubleshooting

Check the error log:

Copycat ~/.claude/skills/nano-banana/last-error.log

Verify API key:

Copysecurity find-generic-password -a "$USER" -s "GEMINI_API_KEY" -w | head -c 10