Nano Banana Prompt Generator - Claude Skill
A Claude skill for generating professional Nano Banana / Gemini image prompts.
Works with Claude.ai, Claude Desktop, and Claude Code.
Supports Image Generation, Photo Editing, YouTube Thumbnails, Infographics, Storyboards.
What is this?
A skill for Claude that helps you write effective prompts for Nano Banana - Google's family of AI image generation models in the Gemini API. Unlike most AI image tools that expect tag lists, Nano Banana works like a creative director: it understands intent, context, and full-sentence descriptions.
Works with Claude.ai (web), Claude Desktop, and Claude Code - all three support the same skill format.
The skill covers all three current Gemini image models:
| Marketing name | Model code | Status |
|---|
| Nano Banana | gemini-2.5-flash-image | Stable |
| Nano Banana 2 | gemini-3.1-flash-image-preview | Preview |
| Nano Banana Pro | gemini-3-pro-image-preview | Preview |
Every model spec, capability, and price in this skill is verified against ai.google.dev/gemini-api/docs. See SKILL.md "Verification & Sources" for the full URL list.
Try the interactive web generator (no install): maciejdzierzek.com/narzedzia/generator-nano-banana
Features
- 5 generation modes: Image Generation, Photo Editing, YouTube Thumbnails, Infographics, Storyboards
- Per-model guidance: choose between Stable (Nano Banana) and Preview (NB2, Pro) based on the task
- Conversational editing patterns - refine iteratively without re-rolling
- Multi-character consistency - up to 5 characters (Pro) or 4 (NB2) with documented limits
- Multi-reference compositions - up to 14 reference images with role assignment
- In-image text translation - preserve design while changing language
- Image Search Grounding - pull real, current data into infographics (NB2 and Pro)
- Storyboard frames for Veo handoff - prompt patterns for video-pipeline workflows
- Verified pricing reference - per-tier (Standard / Batch / Flex / Priority) costs
- Trigger accuracy eval suite for the skill-creator framework
Installation
Claude.ai and Claude Desktop (all plans, including free)
- Download nano-banana-prompt-generator-skill.zip from this repository (click → Download raw file)
- In Claude.ai or Claude Desktop: go to Customize > Skills → click "+" → "Upload a skill"
- Upload the ZIP file and toggle the skill on
Claude will automatically use the skill when you describe a Nano Banana image task. Available on Free, Pro, Max, Team, and Enterprise plans.
Note: Skills require code execution to be enabled. If you don't see the Skills section, go to Settings > Capabilities and enable "Code execution and file creation" first.
Claude Code (CLI) - via plugin marketplace
/plugin marketplace add maciejdzierzek/nano-banana-prompt-generator
/plugin install nano-banana-prompt-generator@maciejdzierzek
No download needed - installs directly from this GitHub repository.
Claude Code (CLI) - manual install
mkdir -p ~/.claude/skills/nano-banana
cp -r skills/nano-banana/* ~/.claude/skills/nano-banana/
For project-specific use:
mkdir -p /your-project/.claude/skills/nano-banana
cp -r skills/nano-banana/* /your-project/.claude/skills/nano-banana/
Reload Claude Code. The skill activates automatically.
Interactive web generator (no installation)
Use directly at: maciejdzierzek.com/narzedzia/generator-nano-banana
No API key, no registration, no data sent to servers. Works in your browser.
Usage
Describe what you want - the skill picks the right model and template:
Image Generation:
Generate a Nano Banana prompt for a product photo of my coffee grinder.
Minimalist studio look, white background, space for text on the right.
Photo Editing:
I have a photo of a storefront in summer. Write a Nano Banana prompt
to transform it into winter while keeping the building exactly the same.
YouTube Thumbnail:
I need a thumbnail for my iPhone review video. Excited-person-on-left,
product-on-right layout. Help me write it.
Infographic with current data:
Create a Nano Banana Pro prompt for an infographic showing this quarter's
top-5 economies' GDP growth. Use real, current data via search grounding.
