Gemini Image Generator MCP Server

Generate high-quality images from text prompts using Google's Gemini model through the MCP protocol.

Overview

This MCP server allows any AI assistant to generate images using Google's Gemini AI model. The server handles prompt engineering, text-to-image conversion, filename generation, and local image storage, making it easy to create and manage AI-generated images through any MCP client.

Features

• Text-to-image generation using Gemini 2.0 Flash
• Image-to-image transformation based on text prompts
• Support for both file-based and base64-encoded images
• Automatic intelligent filename generation based on prompts
• Automatic translation of non-English prompts
• Local image storage with configurable output path
• Strict text exclusion from generated images
• High-resolution image output
• Direct access to both image data and file path

Available MCP Tools

The server provides the following MCP tools for AI assistants:

1. generate_image_from_text

Creates a new image from a text prompt description.

generate_image_from_text(prompt: str) -> Tuple[bytes, str]

Parameters:

• prompt: Text description of the image you want to generate

Returns:

• A tuple containing:
  • Raw image data (bytes)
  • Path to the saved image file (str)

This dual return format allows AI assistants to either work with the image data directly or reference the saved file path.

Examples:

• "Generate an image of a sunset over mountains"
• "Create a photorealistic flying pig in a sci-fi city"

Example Output

This image was generated using the prompt:

"Hi, can you create a 3d rendered image of a pig with wings and a top hat flying over a happy futuristic scifi city with lots of greenery?"

A 3D rendered pig with wings and a top hat flying over a futuristic sci-fi city filled with greenery

Known Issues

When using this MCP server with Claude Desktop Host:

1. Performance Issues: Using transform_image_from_encoded may take significantly longer to process compared to other methods. This is due to the overhead of transferring large base64-encoded image data through the MCP protocol.

2. Path Resolution Problems: There may be issues with correctly resolving image paths when using Claude Desktop Host. The host application might not properly interpret the returned file paths, making it difficult to access the generated images.

For the best experience, consider using alternative MCP clients or the transform_image_from_file method when possible.

2. transform_image_from_encoded

Transforms an existing image based on a text prompt using base64-encoded image data.

transform_image_from_encoded(encoded_image: str, prompt: str) -> Tuple[bytes, str]

Parameters:

• encoded_image: Base64 encoded image data with format header (must be in format: "data:image/[format];base64,[data]")
• prompt: Text description of how you want to transform the image

Returns:

• A tuple containing:
  • Raw transformed image data (bytes)
  • Path to the saved transformed image file (str)

Example:

• "Add snow to this landscape"
• "Change the background to a beach"

3. transform_image_from_file

Transforms an existing image file based on a text prompt.

transform_image_from_file(image_file_path: str, prompt: str) -> Tuple[bytes, str]

Parameters:

• image_file_path: Path to the image file to be transformed
• prompt: Text description of how you want to transform the image

Returns:

• A tuple containing:
  • Raw transformed image data (bytes)
  • Path to the saved transformed image file (str)

Examples:

• "Add a llama next to the person in this image"
• "Make this daytime scene look like night time"

Example Transformation

Using the flying pig image created above, we applied a transformation with the following prompt:

"Add a cute baby whale flying alongside the pig"

Before:

After:

The original flying pig image with a cute baby whale added flying alongside it

Setup

Prerequisites

• Python 3.11+
• Google AI API key (Gemini)
• MCP host application (Claude Desktop App, Cursor, or other MCP-compatible clients)

Getting a Gemini API Key

1. Visit Google AI Studio API Keys page
2. Sign in with your Google account
3. Click "Create API Key"
4. Copy your new API key for use in the configuration
5. Note: The API key provides a certain quota of free usage per month. You can check your usage in the Google AI Studio

Installation

1. Clone the repository:

git clone https://github.com/your-username/gemini-image-generator.git
cd gemini-image-generator

2. Create a virtual environment and install dependencies:

# Using regular venv
python -m venv .venv
source .venv/bin/activate
pip install -e .

# Or using uv
uv venv
source .venv/bin/activate
uv pip install -e .

3. Copy the example environment file and add your API key:

cp .env.example .env

4. Edit the .env file to include your Google Gemini API key and preferred output path:

GEMINI_API_KEY="your-gemini-api-key-here"
OUTPUT_IMAGE_PATH="/path/to/save/images"

Configure Claude Desktop

Add the following to your claude_desktop_config.json:

• macOS: ~/Library/Application Support/Claude/claude_desktop_config.json

{
    "mcpServers": {
        "gemini-image-generator": {
            "command": "uv",
            "args": [
                "--directory",
                "/absolute/path/to/gemini-image-generator",
                "run",
                "server.py"
            ],
            "env": {
                "GEMINI_API_KEY": "GEMINI_API_KEY",
                "OUTPUT_IMAGE_PATH": "OUTPUT_IMAGE_PATH"
            }
        }
    }
}

Usage

Once installed and configured, you can ask Claude to generate or transform images using prompts like:

Generating New Images

• "Generate an image of a sunset over mountains"
• "Create an illustration of a futuristic cityscape"
• "Make a picture of a cat wearing sunglasses"

Transforming Existing Images

• "Transform this image by adding snow to the scene"
• "Edit this photo to make it look like it was taken at night"
• "Add a dragon flying in the background of this picture"

The generated/transformed images will be saved to your configured output path and displayed in Claude. With the updated return types, AI assistants can also work directly with the image data without needing to access the saved files.

Testing

You can test the application by running the FastMCP development server:

fastmcp dev server.py

This command starts a local development server and makes the MCP Inspector available at http://localhost:5173/. The MCP Inspector provides a convenient web interface where you can directly test the image generation tool without needing to use Claude or another MCP client. You can enter text prompts, execute the tool, and see the results immediately, which is helpful for development and debugging.

License

MIT License