MCP Servers

Nano Banana MCP

MCP server for AI image generation and editing using Google Gemini image models.

README

Nano Banana MCP

MCP server for AI image generation and editing using Google Gemini image models.

Models

Product	Model ID	Default
Nano Banana 2	`gemini-3.1-flash-image-preview`	Yes
Nano Banana	`gemini-2.5-flash-image`	No
Nano Banana Pro	`gemini-3-pro-image-preview`	No

Setup

npx nano-banana-mcp setup

This interactive wizard lets you choose:

Google OAuth (default) -- opens browser for one-click authorization
API Key -- paste your key from Google AI Studio

MCP Client Configuration

Claude Code

{
  "mcpServers": {
    "nano-banana": {
      "command": "npx",
      "args": ["nano-banana-mcp"]
    }
  }
}

Claude Desktop

Add to ~/Library/Application Support/Claude/claude_desktop_config.json:

{
  "mcpServers": {
    "nano-banana": {
      "command": "npx",
      "args": ["nano-banana-mcp"]
    }
  }
}

Tools

`generate_image`

Create an image from a text prompt.

Parameter	Type	Required	Description
`prompt`	string	Yes	Text description of the image to generate
`model`	string	No	Model ID (defaults to `gemini-3.1-flash-image-preview`)
`aspectRatio`	string	No	One of `1:1`, `16:9`, `9:16`, `4:3`, `3:4` (default: `1:1`)

`edit_image`

Edit an existing image using a text prompt.

Parameter	Type	Required	Description
`prompt`	string	Yes	Instructions for how to edit the image
`imagePath`	string	Yes	Path to the source image
`referenceImages`	string[]	No	Paths to reference images for style/context
`model`	string	No	Model ID

`continue_editing`

Refine the last generated or edited image.

Parameter	Type	Required	Description
`prompt`	string	Yes	Refinement instructions
`model`	string	No	Model ID

`configure_auth`

Set a Gemini API key at runtime.

`get_status`

Check auth state, current model, and output directory.

`get_last_image`

Get metadata about the most recently generated/edited image.

`list_models`

List available models with current default.

Environment Variables

Variable	Description
`NANO_BANANA_CLIENT_ID`	Override embedded OAuth client ID
`NANO_BANANA_CLIENT_SECRET`	Override embedded OAuth client secret
`GEMINI_API_KEY`	Gemini API key (skips stored credentials)
`NANO_BANANA_OUTPUT_DIR`	Custom image output directory
`NANO_BANANA_CONFIG_DIR`	Custom config directory

Development

npm install
npm run build
npm test
npm run test:coverage

License

MIT

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