nano-banana-pro-mcp

MCP server that enables AI agents like Claude to generate images using Google's Gemini image generation models (including Nano Banana Pro - gemini-3-pro-image-preview).

Note: I thought it was cool that Google Antigravity could generate images using nanobanana so I stole the idea.

Example

Here's Claude Code using the MCP to generate a hero image for a travel landing page:

And the beautiful result:

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Installation

Claude Code CLI

claude mcp add nano-banana-pro --env GEMINI_API_KEY=your_api_key_here -- npx @rafarafarafa/nano-banana-pro-mcp

Replace your_api_key_here with your actual Gemini API key.

Claude Desktop

Add to your Claude Desktop configuration file:

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

{
  "mcpServers": {
    "nano-banana-pro": {
      "command": "npx",
      "args": ["@rafarafarafa/nano-banana-pro-mcp"],
      "env": {
        "GEMINI_API_KEY": "your_api_key_here"
      }
    }
  }
}

Codex CLI

Create or edit .mcp.json in your project directory (or ~/.mcp.json for global config):

{
  "mcpServers": {
    "nano-banana-pro": {
      "command": "npx",
      "args": ["@rafarafarafa/nano-banana-pro-mcp"],
      "env": {
        "GEMINI_API_KEY": "your_api_key_here"
      }
    }
  }
}

Gemini CLI

Create or edit ~/.gemini/settings.json:

{
  "mcpServers": {
    "nano-banana-pro": {
      "command": "npx",
      "args": ["@rafarafarafa/nano-banana-pro-mcp"],
      "env": {
        "GEMINI_API_KEY": "your_api_key_here"
      }
    }
  }
}

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Get an API Key

Get a free Gemini API key from Google AI Studio.

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Available Tools

generate_image

Generate an image from a text prompt. Optionally provide reference images to guide the style or content.

Parameters:

• prompt (required): Description of the image to generate
• model (optional): Gemini model to use (default: gemini-3-pro-image-preview)
  • gemini-3-pro-image-preview - Nano Banana Pro (highest quality)
  • gemini-2.5-flash-preview-05-20 - Nano Banana (fast)
  • gemini-2.0-flash-exp - Widely available fallback
• aspectRatio (optional): "1:1" | "3:4" | "4:3" | "9:16" | "16:9"
• imageSize (optional): "1K" | "2K" | "4K" (only for image-specific models)
• images (optional): Array of reference images to guide generation
  • Each image: { data: "base64...", mimeType: "image/png" }
• outputPath (optional): File path to save the generated image (e.g., /path/to/image.png)

Example prompts:

Generate an image of a sunset over mountains

Generate a logo in the style of this reference image [with image attached]

Generate a hero image and save it to ./assets/hero.png

edit_image

Edit one or more images based on instructions.

Parameters:

• prompt (required): Instructions for how to edit the image(s)
• images (required): Array of images to edit
  • Each image: { data: "base64...", mimeType: "image/png" }
• model (optional): Gemini model to use (default: gemini-3-pro-image-preview)
• outputPath (optional): File path to save the edited image (e.g., /path/to/image.png)

Example prompts:

Add sunglasses to this photo

Remove the background from this image

Combine these two images into one scene

describe_image

Analyze and describe one or more images. Returns text only (no image generation).

Parameters:

• images (required): Array of images to analyze
  • Each image: { data: "base64...", mimeType: "image/png" }
• prompt (optional): Custom analysis prompt (default: general description)
• model (optional): Gemini model to use (default: gemini-3-pro-image-preview)

Example prompts:

[default] Describe this image in detail

What objects are in this image?

How many people are in this photo?

What's the dominant color in this image?

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Development

Setup

npm install
npm run build

Testing

npm test              # Run unit tests
npm run test:watch    # Run tests in watch mode
npm run typecheck     # Type check without emitting

Manual Testing

# Generate a real image and save to test-output.png
GEMINI_API_KEY=your_key npm run test:manual "a cute cat wearing sunglasses"

Testing with MCP Inspector

npx @modelcontextprotocol/inspector node dist/index.js

Then set GEMINI_API_KEY in the inspector's environment and call the generate_image tool.

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License

MIT