MCPInstall

nano-banana

by kingbootoshiMedia & Creative

Generates AI images using the nano-banana CLI (Gemini 3.1 Flash default, Pro available). Handles multi-resolution (512-4K), aspect ratios, reference images for style transfer, green screen workflow for transparent assets, cost tracking, and exact dimension control. Use when asked to "generate an image", "create a sprite", "make an asset", "generate artwork", or any image generation task for UI mockups, game assets, videos, or marketing materials.

Installs
666
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Install

Works with every agent the skills CLI supports.

npx skills add https://github.com/kingbootoshi/nano-banana-2-skill --skill nano-banana
  1. 01

    Install

    Run the command in your project. The CLI asks which agents to install for.

  2. 02

    Describe the task

    Ask your agent for something this skill covers. It loads nano-banana automatically when relevant.

  3. 03

    Review the result

    The agent follows the SKILL.md steps, scripts and references bundled with the skill.

SKILL.md

The instructions your agent reads when the skill is triggered.

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

OptionDefaultDescription
-o, --outputnano-gen-{timestamp}Output filename (no extension)
-s, --size1KImage size: 512, 1K, 2K, or 4K
-a, --aspectmodel defaultAspect ratio: 1:1, 16:9, 9:16, 4:3, 3:4, etc.
-m, --modelflashModel: flash/nb2, pro/nb-pro, or any model ID
-d, --dircurrent directoryOutput directory
-r, --ref-Reference image (can use multiple times)
-t, --transparent-Generate on green screen, remove background (FFmpeg)
--api-key-Gemini API key (overrides env/file)
--costs-Show cost summary

Models

AliasModelUse When
flash, nb2Gemini 3.1 FlashDefault. Fast, cheap (~$0.067/1K image)
pro, nb-proGemini 3 ProHighest quality needed (~$0.134/1K image)

Sizes

SizeCost (Flash)Cost (Pro)
512~$0.045Flash 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:

  1. First -r flag: your reference/style image
  2. Last -r flag: blank image in target dimensions
  3. 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:

  1. --api-key flag
  2. GEMINI_API_KEY environment variable
  3. .env file in current directory
  4. .env file next to the CLI script
  5. ~/.nano-banana/.env

Get a key at: https://aistudio.google.com/apikey

FAQ

What does the nano-banana skill do?

Generates AI images using the nano-banana CLI (Gemini 3.1 Flash default, Pro available). Handles multi-resolution (512-4K), aspect ratios, reference images for style transfer, green screen workflow for transparent assets, cost tracking, and exact dimension control. Use when asked to "generate an image", "create a sprite", "make an asset", "generate artwork", or any image generation task for UI mockups, game assets, videos, or marketing materials.

How do I install nano-banana?

Run npx skills add https://github.com/kingbootoshi/nano-banana-2-skill --skill nano-banana in your project. The skills CLI detects the agents you use and copies the skill into the right folder. For Claude Code you can also place the skill folder at ~/.claude/skills/nano-banana/ (personal) or .claude/skills/nano-banana/ (project).

Which AI agents can use nano-banana?

Any agent that supports the open Agent Skills format (a folder with a SKILL.md file), including Claude Code, Codex, Cursor, GitHub Copilot, Gemini CLI, Windsurf, Cline, OpenCode and more.

Is nano-banana safe to install?

No partner security audit is available yet. Skills can run commands and scripts, so read the SKILL.md and any bundled files before installing.

Who maintains nano-banana?

It is published by kingbootoshi in kingbootoshi/nano-banana-2-skill. It has 666 recorded installs.

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