MCP Servers

Nano Banana MCP

MCP server for Google's Nano Banana image generation models (Gemini). Generate and edit images via natural language.

README

@maheidem/nanobanana-mcp

MCP server for Google's Nano Banana image generation models (Gemini). Generate and edit images via natural language from Claude Code or any MCP client.

Features

Text-to-image generation with configurable model, aspect ratio, and resolution (up to 4K)
Image editing via natural language — add/remove elements, style transfer, inpainting
Iterative refinement — keep editing the last generated image
3 model tiers — Flash (cheap), Pro (studio-quality), Flash 2 (best value)
File paths only — no base64 in responses, prevents context window overflow
Persistent model preference — choose once, used everywhere

Models

Model	ID	Status	Max Resolution	Price/Image
Nano Banana	`gemini-2.5-flash-image`	GA	1K	$0.039
Nano Banana Pro	`gemini-3-pro-image-preview`	Preview	4K	$0.134–$0.24
Nano Banana 2	`gemini-3.1-flash-image-preview`	Preview	4K	$0.045–$0.151

Prerequisites

Node.js >= 18
A Google AI API key with billing enabled (no free tier for image generation)
Get your key at Google AI Studio

Install

Claude Code (recommended)

claude mcp add nano-banana -e GEMINI_API_KEY=your-key -- npx --yes @maheidem/nanobanana-mcp

Manual `.mcp.json`

{
  "mcpServers": {
    "nano-banana": {
      "command": "npx",
      "args": ["@maheidem/nanobanana-mcp"],
      "env": {
        "GEMINI_API_KEY": "your-key"
      }
    }
  }
}

Tools

`nb_generate_image`

Generate a new image from a text prompt.

Parameter	Required	Description
`prompt`	Yes	Text description of the image
`model`	No	Model ID (uses saved preference)
`aspectRatio`	No	e.g. `16:9`, `1:1`, `9:16`
`imageSize`	No	`512`, `1K`, `2K`, or `4K`
`outputDir`	No	Save directory (default: `NB_OUTPUT_DIR` or cwd)

`nb_edit_image`

Edit an existing image with natural language instructions.

Parameter	Required	Description
`imagePath`	Yes	Path to the source image
`prompt`	Yes	Edit instructions
`referenceImagePaths`	No	Reference images for style transfer
`model`	No	Model ID
`aspectRatio`	No	Output aspect ratio
`imageSize`	No	Output resolution
`outputDir`	No	Save directory

`nb_continue_editing`

Continue editing the last generated/edited image.

Parameter	Required	Description
`prompt`	Yes	New edit instructions
`model`	No	Model ID
`imageSize`	No	Output resolution
`outputDir`	No	Save directory

`nb_get_last_image`

Get metadata about the last generated/edited image. No API call.

`nb_list_models`

List available models and set a preferred model (persisted to disk).

Parameter	Required	Description
`setModel`	No	Model ID to save as default

Environment Variables

Variable	Required	Description
`GEMINI_API_KEY`	Yes	Google AI API key (or `GOOGLE_API_KEY`)
`NB_OUTPUT_DIR`	No	Default output directory for generated images

License

MIT

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