Imagen - AI Image Generation Skill

A Claude Code skill that generates images using Google Gemini's image generation model. Simply ask Claude to create an image during any coding session, and it will generate and save it for you.

Cross-Platform: Works on Windows, macOS, and Linux.

Quick Start

1. Install the Skill

# Via plugin marketplace (recommended)
/plugin install imagen@ai-skills

# Or add the entire marketplace
/plugin marketplace add sanjay3290/ai-skills

2. Set Your API Key

Get a free API key from Google AI Studio:

Windows (PowerShell):

$env:GEMINI_API_KEY = "your-api-key-here"

Windows (CMD):

set GEMINI_API_KEY=your-api-key-here

macOS/Linux:

export GEMINI_API_KEY="your-api-key-here"

# Add to ~/.zshrc or ~/.bashrc to persist
echo 'export GEMINI_API_KEY="your-api-key-here"' >> ~/.zshrc

3. Use It!

Just ask Claude to generate an image during any conversation:

"Generate an image of a sunset over mountains"
"I need a hero image for my landing page"
"Create an app icon for a weather app"

How It Works

When you mention needing an image, Claude will automatically:

1. Recognize the request and activate this skill
2. Call the Google Gemini API with your prompt
3. Save the generated image to your project
4. Tell you where to find it

Features

• Cross-Platform: Python script works on Windows, macOS, and Linux
• Automatic Activation: Claude detects when you need an image
• Multiple Sizes: 512px, 1K (default), or 2K resolution
• Custom Output Paths: Save images wherever you need them
• Frontend Ready: Perfect for UI development, placeholders, icons
• Documentation Images: Generate diagrams, illustrations, flowcharts

Usage Examples

During Frontend Development

You: "I'm building a dashboard. Generate a placeholder chart image."
Claude: *generates and saves image* "Created the image at ./assets/chart-placeholder.png"

For Documentation

You: "Create an architecture diagram for our microservices"
Claude: *generates image* "Saved to ./docs/architecture.png"

Custom Size & Location

You: "Generate a high-res hero image and save it to ./public/hero.png"
Claude: *generates 2K image at specified path*

Configuration

Environment Variables

Variable	Required	Default	Description
GEMINI_API_KEY	Yes	-	Your Google Gemini API key
IMAGE_SIZE	No	1K	Default size (512, 1K, or 2K)
GEMINI_MODEL	No	gemini-3-pro-image-preview	Gemini model ID

Image Sizes

Size	Resolution	Best For
512	512x512	Icons, thumbnails, quick previews
1K	1024x1024	General use, web images
2K	2048x2048	High-res, print, retina displays

Manual Script Usage

# Basic usage
python scripts/generate_image.py "A serene lake at dawn"

# Custom output path
python scripts/generate_image.py "App icon" "./icon.png"

# With size option
python scripts/generate_image.py --size 2K "Detailed landscape" "./wallpaper.png"

# With custom model
python scripts/generate_image.py --model gemini-3-pro-image-preview "A logo" "./logo.png"

File Structure

imagen/
├── SKILL.md               # Skill definition (Claude reads this)
├── README.md              # This file
├── reference.md           # Detailed API reference
├── examples.md            # Usage examples
├── .env.example           # API key template
└── scripts/
    └── generate_image.py  # Cross-platform Python script

Requirements

• Python 3.6+: No additional packages needed (uses standard library only)
• Gemini API Key: Free from Google AI Studio

Troubleshooting

"GEMINI_API_KEY not set"

Windows:

echo $env:GEMINI_API_KEY  # Should show your key

macOS/Linux:

echo $GEMINI_API_KEY  # Should show your key
source ~/.zshrc       # Reload if you just added it

API Errors

• 400: Check your prompt for special characters
• 429: Rate limited, wait and retry
• 403: Invalid API key

Getting a Gemini API Key

1. Go to Google AI Studio
2. Sign in with your Google account
3. Click "Get API Key" in the left sidebar
4. Create a new key or copy an existing one
5. Add it to your environment as shown above

License

Apache-2.0 License - See LICENSE for details.