nano-banana-poster
Generate images and posters with Google Gemini. Use for: create image, generate visual, AI image generation, marketing poster.
- Installs
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Install
Works with every agent the skills CLI supports.
npx skills add https://github.com/aviz85/claude-skills-library --skill nano-banana-poster- 01
Install
Run the command in your project. The CLI asks which agents to install for.
- 02
Describe the task
Ask your agent for something this skill covers. It loads nano-banana-poster automatically when relevant.
- 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 Poster Generator
First time? If
setup_complete: falseabove, run./SETUP.mdfirst, then setsetup_complete: true.
Generate images using Google's Gemini model with optional reference assets.
Quick Start
cd ~/.claude/skills/nano-banana-image/scripts
# Basic generation (default 3:2 horizontal)
npx ts-node generate_poster.ts "A futuristic city at sunset"
# With aspect ratio (3:2 horizontal, 2:3 vertical, 16:9 wide, 9:16 tall)
npx ts-node generate_poster.ts --aspect 3:2 "A wide landscape poster"
npx ts-node generate_poster.ts -a 9:16 "A vertical story format"
# With reference assets
npx ts-node generate_poster.ts --assets "my-logo" "Create banner with logo"
# Combined: aspect ratio + assets
npx ts-node generate_poster.ts --aspect 16:9 --assets "logo" "YouTube thumbnail"
Aspect Ratio
IMPORTANT: Always use the default 3:2 aspect ratio unless the user explicitly requests a different format (like "vertical", "story", "square", etc.). Do NOT change the aspect ratio on your own.
Control image dimensions with --aspect or -a:
| Ratio | Use Case |
|---|---|
3:2 | Horizontal (DEFAULT - use this unless user specifies otherwise) |
1:1 | Square - Instagram, profile pics |
2:3 | Vertical - Pinterest, posters |
16:9 | Wide - YouTube thumbnails, headers |
9:16 | Tall - Stories, reels, TikTok |
npx ts-node generate_poster.ts --aspect 3:2 "Your prompt"
npx ts-node generate_poster.ts -a 16:9 "Your prompt"
Adding Assets
Use --assets with full paths to include reference images:
# Single asset
npx ts-node generate_poster.ts --assets "/full/path/to/image.jpg" "Your prompt"
# Multiple assets (comma-separated)
npx ts-node generate_poster.ts --assets "/path/a.jpg,/path/b.png" "Use both images"
Supported formats: .jpg, .jpeg, .png, .webp, .gif
IMPORTANT: Assets are NOT automatically included. You must explicitly pass them via --assets.
Save to Gallery
Save good results for future style reference:
npx ts-node generate_poster.ts --save-to-gallery "my-style" "prompt"
Creates assets/gallery/my-style.jpg + .meta.json with prompt info.
API Configuration
Create scripts/.env:
GEMINI_API_KEY=your_api_key_here
Hebrew/RTL Content
When generating images with Hebrew text:
ALWAYS include in prompt:
CRITICAL: All text must be in Hebrew.
CRITICAL: Layout direction is RTL (right-to-left).
Flow, reading order, and visual hierarchy must go from RIGHT to LEFT.
This ensures text renders correctly and visual flow matches Hebrew reading direction.
Output
- Files saved as
poster_0.jpg,poster_1.jpg, etc. - Aspect ratio: Configurable via
--aspect(default: 3:2) - Quality: 1K (1024px on longest edge)
FAQ
What does the nano-banana-poster skill do?
Generate images and posters with Google Gemini. Use for: create image, generate visual, AI image generation, marketing poster.
How do I install nano-banana-poster?
Run npx skills add https://github.com/aviz85/claude-skills-library --skill nano-banana-poster 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-poster/ (personal) or .claude/skills/nano-banana-poster/ (project).
Which AI agents can use nano-banana-poster?
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-poster 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-poster?
It is published by aviz85 in aviz85/claude-skills-library. It has 61 recorded installs.
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