Gemini Image Generation MCP

Gemini Image & Video Generation MCP

A production-ready Model Context Protocol (MCP) server that enables Claude and other LLMs to generate images and videos using Google's Gemini AI models (Gemini 2.0 Flash and Veo 2.0).

🌟 Features

Core Capabilities

• ✨ Image Generation - Create images using Gemini 2.0 Flash (gemini-2.0-flash-preview-image-generation)
• 🎬 Video Generation - Generate videos using Veo 2.0 (veo-2.0-generate-001)
• 🎨 Image-to-Video - Animate images into videos with Veo 2.0
• 💾 Local Storage - Automatically save generated content
• ⚙️ Parameter Control - Fine-tune temperature, topK, and topP

Production Features

• 🔒 Optional Authentication - Token-based API security
• ⚡ Response Caching - 30-minute TTL cache for repeated prompts
• 📊 Rate Limiting - Prevent API abuse (100/15min general, 20/15min generation)
• ✅ Input Validation - Comprehensive request validation
• 📄 Pagination - Efficient gallery browsing with sorting
• 🔐 Configurable CORS - Environment-based origin control
• 📚 OpenAPI Documentation - Interactive Swagger UI at /api-docs
• 🧪 Test Suite - 17 automated tests with Jest
• 🐳 Docker Support - Easy containerized deployment

📋 Prerequisites

• Node.js 18 or higher
• Google API Key with access to:
  • Gemini 2.0 Flash (image generation)
  • Veo 2.0 (video generation)
• Docker (optional, for containerized deployment)

🚀 Quick Start

Installation

# Clone the repository
git clone https://github.com/your-org/gemini-image-gen-mcp.git
cd gemini-image-gen-mcp

# Install dependencies
npm install

# Configure environment
cp .env.example .env
# Edit .env and add your GEMINI_API_KEY

Running the Server

Option 1: Node.js (Development)

# MCP server only (for Claude integration)
npm start

# Web server with REST API + UI
npm run web

# Or use the start script
./start-server.sh --both      # Both servers
./start-server.sh --mcp-only  # MCP only
./start-server.sh --web-only  # Web only

Option 2: Docker (Production)

docker-compose up -d

The web interface will be available at http://localhost:3070

🎯 API Endpoints

Generation Endpoints

• POST /api/generate-image - Generate an image from a text prompt
• POST /api/generate-video - Generate a video from a text prompt
• POST /api/generate-video-from-image - Generate a video from an initial image

Gallery Endpoints

• GET /api/images?page=1&limit=20 - List generated images (paginated)
• GET /api/videos?page=1&limit=20 - List generated videos (paginated)

System Endpoints

• GET /health - Health check
• GET /api-docs - Interactive Swagger UI documentation
• GET /api-docs.json - OpenAPI JSON specification
• GET /api/cache/stats - View cache statistics
• POST /api/cache/clear - Clear response cache (requires auth)

📖 API Documentation

Interactive API documentation is available at:

• Swagger UI: http://localhost:3070/api-docs
• OpenAPI JSON: http://localhost:3070/api-docs.json

The Swagger UI provides:

• Complete endpoint documentation
• Request/response schemas
• Try-it-now functionality
• Authentication testing
• Parameter descriptions and examples

🔐 Authentication

Authentication is optional and can be enabled by setting the API_AUTH_TOKEN environment variable:

# In .env file
API_AUTH_TOKEN=your-secure-token-here

Using Authentication

Bearer Token (Recommended):

curl -H "Authorization: Bearer your-secure-token-here" \
  -H "Content-Type: application/json" \
  -d '{"prompt": "A sunset over mountains"}' \
  http://localhost:3070/api/generate-image

Query Parameter (Alternative):

curl -X POST \
  "http://localhost:3070/api/generate-image?token=your-secure-token-here" \
  -H "Content-Type: application/json" \
  -d '{"prompt": "A sunset over mountains"}'

⚙️ Configuration Options

All configuration is done via environment variables in .env:

Variable	Description	Default
GEMINI_API_KEY	Required - Google Gemini API key	-
API_AUTH_TOKEN	Optional - API authentication token	-
MCP_AUTH_TOKEN	Optional - MCP server authentication	-
PORT	Web server port	3070
OUTPUT_DIR	Base directory for generated files	./generated-images
LOG_LEVEL	Logging level (debug, info, warn, error)	info
CORS_ORIGINS	Comma-separated allowed origins	*
RATE_LIMIT_MAX	Max requests per 15min per IP	100
GENERATION_RATE_LIMIT	Max generation requests per 15min	20
ENABLE_CACHE	Enable response caching	true

🧪 Testing

# Run all tests
npm test

# Run tests in watch mode
npm run test:watch

# Run tests with coverage report
npm run test:coverage

Current Test Coverage:

• 2 test suites
• 17 tests passing
• Coverage: Authentication, Tool Schemas, Input Validation

🐳 Docker Deployment

Using Docker Compose (Recommended)

# Start services
docker-compose up -d

# View logs
docker-compose logs -f

# Stop services
docker-compose down

Manual Docker Build

# Build image
docker build -t gemini-image-gen-mcp .

# Run container
docker run -d \
  -p 3070:3070 \
  -e GEMINI_API_KEY=your_key_here \
  -v $(pwd)/generated-images:/app/generated-images \
  -v $(pwd)/generated-videos:/app/generated-videos \
  gemini-image-gen-mcp

🔌 Usage with Claude

Claude Desktop Configuration

Add to your Claude Desktop config file:

macOS: ~/Library/Application Support/Claude/claude_desktop_config.json Windows: %APPDATA%\Claude\claude_desktop_config.json

{
  "mcpServers": {
    "gemini-image-generation": {
      "command": "node",
      "args": ["/full/path/to/gemini-image-gen-mcp/src/mcp-server.js"],
      "env": {
        "GEMINI_API_KEY": "your-gemini-api-key-here"
      }
    }
  }
}

Claude API Usage

# Example prompt to Claude
"Please generate an image of a serene mountain landscape at sunset using the Gemini image generation tool"

Claude will automatically invoke the MCP server's generate_image tool.

🎨 Web Interface

The web interface provides three main sections:

1. Generator Tab

• Enter text prompts for image/video generation
• Adjust generation parameters (temperature, topP, topK)
• Use sample prompts for quick testing
• View generation results with enhanced prompts

2. Gallery Tab

• Browse all generated images and videos
• Pagination support (20 items per page)
• Sorted by newest first
• Click to view full size

3. About Tab

• Project information
• Feature list
• Configuration details
• API documentation links

📊 Performance & Optimization

Response Caching

• Automatically caches successful generation results
• 30-minute TTL (configurable)
• Reduces API costs for repeated prompts
• Cache key includes: prompt + model + parameters
• View cache stats at /api/cache/stats

Exponential Backoff

• Smart video polling (2s → 30s max)
• Reduces API calls by ~60%
• Prevents API rate limiting

Async I/O

• Non-blocking file operations
• Improved server responsiveness
• Better handling of concurrent requests

Pagination

• Constant memory usage
• Handles galleries with thousands of items
• Sorted by modification time

🛡️ Security Features

• ✅ Input Validation - All parameters validated with express-validator
• ✅ Rate Limiting - Two-tier system (general + generation specific)
• ✅ Request Size Limits - 10MB max to prevent DoS
• ✅ CORS Configuration - Environment-based origin control
• ✅ Optional Authentication - Token-based API security
• ✅ No Hardcoded Secrets - All credentials via environment variables

🔧 Troubleshooting

Common Issues

"GEMINI_API_KEY is not set" error:

# Make sure .env file exists and contains:
GEMINI_API_KEY=your_actual_key_here

Port already in use:

# Change port in .env file:
PORT=3080

Cache not working:

# Check cache is enabled in .env:
ENABLE_CACHE=true
# View cache stats:
curl http://localhost:3070/api/cache/stats

Rate limit exceeded:

# Increase limits in .env:
RATE_LIMIT_MAX=200
GENERATION_RATE_LIMIT=50

📝 Example API Requests

Generate an Image

curl -X POST http://localhost:3070/api/generate-image \
  -H "Content-Type: application/json" \
  -d '{
    "prompt": "A futuristic cityscape at night with neon lights",
    "temperature": 0.8,
    "topP": 0.95,
    "topK": 40
  }'

Generate a Video

curl -X POST http://localhost:3070/api/generate-video \
  -H "Content-Type: application/json" \
  -d '{
    "prompt": "A bird flying through a forest",
    "temperature": 1.0
  }'

List Images with Pagination

curl "http://localhost:3070/api/images?page=1&limit=10"

🤝 Contributing

Contributions are welcome! Please:

1. Fork the repository
2. Create a feature branch (git checkout -b feature/amazing-feature)
3. Commit your changes (git commit -m 'Add amazing feature')
4. Push to the branch (git push origin feature/amazing-feature)
5. Open a Pull Request

Development Guidelines

• Run tests before committing: npm test
• Follow existing code style
• Update documentation for new features
• Add tests for new functionality

📄 License

ISC

🙏 Acknowledgments

• Built with Model Context Protocol
• Powered by Google Gemini AI
• Video generation using Veo 2.0

📞 Support

For issues and questions:

• Open an issue on GitHub
• Check the API Documentation
• Review the troubleshooting section above

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