Nano Banana 2 Skill

Nano Banana 2 Skill

AI image generation CLI powered by Gemini 3.1 Flash Image Preview (default) with support for Gemini 3 Pro and any Gemini model. Multi-resolution (512-4K), aspect ratios, cost tracking, broadcast-grade green screen transparency, reference images, and style transfer.

Also ships as a [Claude Code](https://docs.anthropic.com/en/docs/claude-code) skill for AI-assisted image generation workflows.

Install

**Requirements:** [Bun](https://bun.sh), [FFmpeg](https://ffmpeg.org) + [ImageMagick](https://imagemagick.org) (for transparent mode)

# Clone the repo
git clone https://github.com/kingbootoshi/nano-banana-2-skill.git ~/tools/nano-banana-2
cd ~/tools/nano-banana-2

# Install dependencies
bun install

# Link globally (no sudo needed - uses Bun's global bin)
bun link

# Set up your API key
mkdir -p ~/.nano-banana
echo "GEMINI_API_KEY=your_key_here" > ~/.nano-banana/.env

Get a Gemini API key at [Google AI Studio](https://aistudio.google.com/apikey).

Now you can use `nano-banana` from anywhere.

As a Claude Code Skill

When installed as a Claude Code skill, just say `/init` and Claude will clone the repo, install deps, and link the command for you. Then use it by saying "generate an image of..." and Claude handles the rest.

Fallback (if `bun link` doesn't work)

mkdir -p ~/.local/bin
ln -sf ~/tools/nano-banana-2/src/cli.ts ~/.local/bin/nano-banana
echo 'export PATH="$HOME/.local/bin:$PATH"' >> ~/.zshrc
source ~/.zshrc

Usage

# Basic - generates 1K image to current directory
nano-banana "minimal dashboard UI with dark theme"

# Custom output name
nano-banana "luxury product mockup" -o product

# Higher resolution
nano-banana "detailed landscape painting" -s 2K

# Ultra high res
nano-banana "cinematic widescreen scene" -s 4K -a 16:9

# Lower resolution (fast, cheap)
nano-banana "quick sketch concept" -s 512

# Custom output directory
nano-banana "UI screenshot" -o dashboard -d ~/Pictures

Models

# Default - Nano Banana 2 (Gemini 3.1 Flash, fast and cheap)
nano-banana "your prompt"

# Pro - highest quality, 2x cost
nano-banana "your prompt" --model pro

# Any model ID
nano-banana "your prompt" --model gemini-2.5-flash-image

Alias	Model	Best For
flash, nb2	Gemini 3.1 Flash Image Preview	Speed, cost, high-volume
pro, nb-pro	Gemini 3 Pro Image Preview	Highest quality, complex composition

Aspect Ratios

# Widescreen
nano-banana "cinematic landscape" -a 16:9

# Portrait
nano-banana "mobile app screenshot" -a 9:16

# Ultra-wide
nano-banana "panoramic scene" -a 21:9

# Standard photo
nano-banana "product photo" -a 4:3

Supported: `1:1`, `16:9`, `9:16`, `4:3`, `3:4`, `3:2`, `2:3`, `4:5`, `5:4`, `21:9`

Reference Images

Edit, transform, or combine existing images:

# Edit an existing image
nano-banana "change the background to pure white" -r dark-ui.png -o light-ui

# Style transfer