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nano-banana
AI image generation CLI. Default model: Gemini 3.1 Flash Image Preview (Nano Banana 2).
/init - First-Time Setup
When the user says "init", "setup nano-banana", or "install nano-banana", run these commands to get the CLI tool on their machine. No sudo required.
Prerequisites: Bun must be installed. If not: curl -fsSL https://bun.sh/install | bash
# 1. Clone the repo
git clone https://github.com/kingbootoshi/nano-banana-2-skill.git ~/tools/nano-banana-2
# 2. Install dependencies
cd ~/tools/nano-banana-2 && bun install
# 3. Link globally (creates `nano-banana` command via Bun - no sudo)
cd ~/tools/nano-banana-2 && bun link
# 4. Set up API key
mkdir -p ~/.nano-banana
echo "GEMINI_API_KEY=<ask user for their key>" > ~/.nano-banana/.env
After init, the user can type nano-banana "prompt" from anywhere.
If bun link fails or the command is not found after linking, fall back to:
mkdir -p ~/.local/bin
ln -sf ~/tools/nano-banana-2/src/cli.ts ~/.local/bin/nano-banana
# Then ensure ~/.local/bin is on PATH:
echo 'export PATH="$HOME/.local/bin:$PATH"' >> ~/.zshrc
source ~/.zshrc
Get a Gemini API key at: https://aistudio.google.com/apikey
Quick Reference
- Command:
nano-banana "prompt" [options]
- Default: 1K resolution, Flash model, current directory
Core Options
| Option | Default | Description |
|---|
-o, --output | nano-gen-{timestamp} | Output filename (no extension) |
-s, --size | 1K | Image size: 512, 1K, 2K, or 4K |
|
Models
| Alias | Model | Use When |
|---|
flash, nb2 | Gemini 3.1 Flash | Default. Fast, cheap (~$0.067/1K image) |
pro, nb-pro | Gemini 3 Pro | Highest quality needed (~$0.134/1K image) |
Sizes
| Size | Cost (Flash) | Cost (Pro) |
|---|
512 | ~$0.045 | Flash only |
1K | ~$0.067 | ~$0.134 |
2K | ~$0.101 | ~$0.201 |
4K | ~$0.151 | ~$0.302 |
Aspect Ratios
Supported: 1:1, 16:9, 9:16, 4:3, 3:4, 3:2, 2:3, 4:5, 5:4, 21:9
Use -a flag: nano-banana "cinematic scene" -a 16:9
Key Workflows
Basic Generation
nano-banana "minimal dashboard UI with dark theme"
nano-banana "cinematic landscape" -s 2K -a 16:9
nano-banana "quick concept sketch" -s 512
Model Selection
# Default (Flash - fast, cheap)
nano-banana "your prompt"
# Pro (highest quality)
nano-banana "detailed portrait" --model pro -s 2K
Reference Images (Style Transfer / Editing)
# Edit existing image
nano-banana "change the background to pure white" -r dark-ui.png -o light-ui
# Style transfer - multiple references
nano-banana "combine these two styles" -r style1.png -r style2.png -o combined
Transparent Assets
nano-banana "robot mascot character" -t -o mascot
nano-banana "pixel art treasure chest" -t -o chest
The -t flag automatically prompts the AI to generate on a green screen, then uses FFmpeg colorkey + despill to key out the background and remove green spill from edge pixels. Pixel-perfect transparency with no manual prompting needed.
Requires: brew install ffmpeg imagemagick
Exact Dimensions
To get a specific output dimension:
- First
-r flag: your reference/style image
- Last
-r flag: blank image in target dimensions
- Include dimensions in prompt
nano-banana "pixel art character in style of first image, 256x256" -r style.png -r blank-256x256.png -o sprite
Reference Order Matters
- First reference: primary style/content source
- Additional references: secondary influences
- Last reference: controls output dimensions (if using blank image trick)
Cost Tracking
Every generation is logged to ~/.nano-banana/costs.json. View summary:
nano-banana --costs
Use Cases
- Landing page assets - product mockups, UI previews
- Image editing - transform existing images with prompts
- Style transfer - combine multiple reference images
- Marketing materials - hero images, feature illustrations
- UI iterations - quickly generate variations of designs
- Transparent assets - icons, logos, mascots with no background
- Game assets - sprites, backgrounds, characters
- Video production - visual elements for video compositions
Prompt Examples
# UI mockups
nano-banana "clean SaaS dashboard with analytics charts, white background"
# Widescreen cinematic
nano-banana "cyberpunk cityscape at sunset" -a 16:9 -s 2K
# Product shots with Pro quality
nano-banana "premium software product hero image" --model pro
# Quick low-res concept
nano-banana "rough sketch of a robot" -s 512
# Dark mode UI
nano-banana "Premium SaaS chat interface, dark mode, minimal, Linear-style aesthetic"
# Game assets with transparency (green screen auto-prompted)
nano-banana "pixel art treasure chest" -t -o chest
# Portrait aspect ratio
nano-banana "mobile app onboarding screen" -a 9:16
API Key Setup
The CLI resolves the Gemini API key in this order:
--api-key flagGEMINI_API_KEY environment variable.env file in current directory.env file next to the CLI script~/.nano-banana/.env
Get a key at: https://aistudio.google.com/apikey
Weekly Installs
187
Repository
kingbootoshi/na…-2-skill
GitHub Stars
247
First Seen
Feb 28, 2026
Security Audits
Gen Agent Trust HubFailSocketFailSnykFail
Installed on
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