io.github.zhongweili/nanobanana-mcp-server

Official

by zhongweili · Python

An MCP server that provides image generation and editing capabilities

Generate and edit images with AI capabilities.

Nano Banana MCP Server 🍌

A production-ready Model Context Protocol (MCP) server that provides AI-powered image generation capabilities through Google's Gemini models with intelligent model selection.

⭐ NEW: Nano Banana 2 — Gemini 3.1 Flash Image! 🍌🚀

Nano Banana 2 (gemini-3.1-flash-image-preview) is now the default model — delivering Pro-level quality at Flash speed:

🍌 Flash Speed + 4K Quality: Up to 3840px at Gemini 2.5 Flash latency
🌐 Google Search Grounding: Real-world knowledge for factually accurate images
🎯 Subject Consistency: Up to 5 characters and 14 objects per scene
✍️ Precision Text Rendering: Crystal-clear text placement in images
🏆 Gemini 3 Pro Image still available for maximum reasoning depth

✨ Features

🎨 Multi-Model AI Image Generation: Three Gemini models with intelligent automatic selection
🍌 Gemini 3.1 Flash Image (NB2): Default model — 4K resolution at Flash speed with grounding
🏆 Gemini 3 Pro Image: Maximum reasoning depth for the most complex compositions
⚡ Gemini 2.5 Flash Image: Legacy Flash model for high-volume rapid prototyping
🤖 Smart Model Selection: Automatically routes to NB2 or Pro based on your prompt
📐 Aspect Ratio Control ⭐ NEW: Specify output dimensions (1:1, 16:9, 9:16, 21:9, and more)
📋 Smart Templates: Pre-built prompt templates for photography, design, and editing
📁 File Management: Upload and manage files via Gemini Files API
🔍 Resource Discovery: Browse templates and file metadata through MCP resources
🛡️ Production Ready: Comprehensive error handling, logging, and validation
⚡ High Performance: Optimized architecture with intelligent caching

🚀 Quick Start

Prerequisites

Google Gemini API Key - Get one free here
Python 3.11+ (for development only)

Installation

Option 1: From MCP Registry (Recommended) This server is available in the Model Context Protocol Registry. Search for "nanobanana" or use the MCP name below with your MCP client.

mcp-name: io.github.zhongweili/nanobanana-mcp-server

Option 2: Using uvx

bash

uvx nanobanana-mcp-server@latest

Option 3: Using pip

bash

pip install nanobanana-mcp-server

🔧 Configuration

Authentication Methods

Nano Banana supports two authentication methods via NANOBANANA_AUTH_METHOD:

API Key (api_key): Uses GEMINI_API_KEY. Best for local development and simple deployments.
Vertex AI ADC (vertex_ai): Uses Google Cloud Application Default Credentials. Best for production on Google Cloud (Cloud Run, GKE, GCE).
Automatic (auto): Defaults to API Key if present, otherwise tries Vertex AI.

1. API Key Authentication (Default)

Set GEMINI_API_KEY environment variable.

2. Vertex AI Authentication (Google Cloud)

Required environment variables:

NANOBANANA_AUTH_METHOD=vertex_ai (or auto)
GCP_PROJECT_ID=your-project-id
GCP_REGION=global (default; required for Gemini 3 Pro Image and NB2. Use us-central1 only for the legacy 2.5 Flash Image model.)

Prerequisites:

Enable Vertex AI API: gcloud services enable aiplatform.googleapis.com
Grant IAM Role: roles/aiplatform.user to the service account.

Claude Desktop

Option 1: Using Published Server (Recommended)

Add to your claude_desktop_config.json:

json

{
  "mcpServers": {
    "nanobanana": {
      "command": "uvx",
      "args": ["nanobanana-mcp-server@latest"],
      "env": {
        "GEMINI_API_KEY": "your-gemini-api-key-here"
      }
    }
  }
}

Option 2: Using Local Source (Development)

If you are running from source code, point to your local installation:

json

{
  "mcpServers": {
    "nanobanana-local": {
      "command": "uv",
      "args": ["run", "python", "-m", "nanobanana_mcp_server.server"],
      "cwd": "/absolute/path/to/nanobanana-mcp-server",
      "env": {
        "GEMINI_API_KEY": "your-gemini-api-key-here"
      }
    }
  }
}

Option 3: Using Vertex AI (ADC)

To authenticate with Google Cloud Application Default Credentials (instead of an API Key):

json

{
  "mcpServers": {
    "nanobanana-adc": {
      "command": "uvx",
      "args": ["nanobanana-mcp-server@latest"],
      "env": {
        "NANOBANANA_AUTH_METHOD": "vertex_ai",
        "GCP_PROJECT_ID": "your-project-id",
        "GCP_REGION": "global"
      }
    }
  }
}

Configuration file locations:

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

Claude Code (VS Code Extension)

Install and configure in VS Code:

Install the Claude Code extension
Open Command Palette (Cmd/Ctrl + Shift + P)
Run "Claude Code: Add MCP Server"

Configure:

json

{
  "name": "nanobanana",
  "command": "uvx",
  "args": ["nanobanana-mcp-server@latest"],
  "env": {
    "GEMINI_API_KEY": "your-gemini-api-key-here"
  }
}

Cursor

Add to Cursor's MCP configuration:

json

{
  "mcpServers": {
    "nanobanana": {
      "command": "uvx",
      "args": ["nanobanana-mcp-server@latest"],
      "env": {
        "GEMINI_API_KEY": "your-gemini-api-key-here"
      }
    }
  }
}

OpenAI Codex

Add to ~/.codex/config.toml (global) or .codex/config.toml (project-scoped):

toml

[mcp_servers.nanobanana]
command = "uvx"
args = ["nanobanana-mcp-server@latest"]

[mcp_servers.nanobanana.env]
GEMINI_API_KEY = "your-gemini-api-key-here"

Or add via the CLI:

bash

codex mcp add

Codex supports both the CLI and VSCode extension using the same config.toml. Once added, Codex can call generate_image, edit_image, and upload_file tools directly in your coding sessions.

Note: The Codex config file is shared by the CLI and the IDE extension. A TOML syntax error will break both simultaneously, so validate your edits carefully.

Continue.dev (VS Code/JetBrains)

Add to your config.json:

json

{
  "mcpServers": [
    {
      "name": "nanobanana",
      "command": "uvx",
      "args": ["nanobanana-mcp-server@latest"],
      "env": {
        "GEMINI_API_KEY": "your-gemini-api-key-here"
      }
    }
  ]
}

Open WebUI

Configure in Open WebUI settings:

json

{
  "mcp_servers": {
    "nanobanana": {
      "command": ["uvx", "nanobanana-mcp-server@latest"],
      "env": {
        "GEMINI_API_KEY": "your-gemini-api-key-here"
      }
    }
  }
}

Gemini CLI / Generic MCP Client

bash

# Set environment variable
export GEMINI_API_KEY="your-gemini-api-key-here"

# Run server in stdio mode
uvx nanobanana-mcp-server@latest

# Or with pip installation
python -m nanobanana_mcp_server.server

🤖 Model Selection

Nano Banana supports three Gemini models with intelligent automatic selection:

🍌 NB2 — Nano Banana 2 (Gemini 3.1 Flash Image) ⭐ DEFAULT

Flash speed with Pro-level quality — the best of both worlds

Quality: Production-ready 4K output
Resolution: Up to 4K (3840px)
Speed: ~2-4 seconds per image (Flash-class latency)
Special Features:
- 🌐 Google Search Grounding: Real-world knowledge for factually accurate images
- 🎯 Subject Consistency: Up to 5 characters and 14 objects per scene
- ✍️ Precision Text Rendering: Clear, well-placed text in images
Best for: Almost everything — production assets, marketing, photography, text overlays
model_tier: "nb2" (or "auto" — NB2 is the auto default)

🏆 Pro Model — Nano Banana Pro (Gemini 3 Pro Image)

Maximum reasoning depth for the most demanding compositions

Quality: Highest available
Resolution: Up to 4K (3840px)
Speed: ~5-8 seconds per image
Special Features:
- 🧠 Advanced Reasoning: Configurable thinking levels (LOW/HIGH)
- 🌐 Google Search Grounding: Real-world knowledge integration
- 📐 Media Resolution Control: Fine-tune vision processing detail
Best for: Complex narrative scenes, intricate compositions, maximum reasoning required
model_tier: "pro"

⚡ Flash Model (Gemini 2.5 Flash Image)

Legacy model for high-volume rapid iteration

Speed: Very fast (2-3 seconds)
Resolution: Up to 1024px
Best for: High-volume generation, quick drafts where 4K is not needed
model_tier: "flash"

🤖 Automatic Selection (Recommended)

By default, the server uses AUTO mode which routes to NB2 unless Pro's deeper reasoning is clearly needed:

Pro Model Selected When:

Strong quality keywords: "4K", "professional", "production", "high-res", "HD"
High thinking level requested: thinking_level="HIGH"
Multi-image conditioning with multiple input images

NB2 Model Selected When (default):

Standard requests, everyday image generation
Speed keywords: "quick", "draft", "sketch", "rapid"
High-volume batch generation (n > 2)

Usage Examples

python

# Automatic selection (recommended) — routes to NB2 by default
"A cat sitting on a windowsill"             # → NB2 (default)
"Quick sketch of a cat"                     # → NB2 (speed keyword, NB2 is fast enough)
"Professional 4K product photo"             # → Pro (strong quality keywords)

# Explicit NB2 selection
generate_image(
    prompt="Product photo on white background",
    model_tier="nb2",              # Nano Banana 2 (Flash speed + 4K)
    resolution="4k",
    enable_grounding=True
)

# Leverage Nano Banana Pro for complex reasoning
generate_image(
    prompt="Cinematic scene: three characters in a tense standoff at dusk",
    model_tier="pro",              # Pro for deep reasoning
    resolution="4k",
    thinking_level="HIGH",         # Enhanced reasoning
    enable_grounding=True
)

# Legacy Flash for high-volume drafts
generate_image(
    prompt="Simple icon",
    model_tier="flash"             # Fast 1024px generation
)

# Control aspect ratio for different formats ⭐ NEW!
generate_image(
    prompt="Cinematic landscape at sunset",
    aspect_ratio="21:9"            # Ultra-wide cinematic format
)

generate_image(
    prompt="Instagram post about coffee",
    aspect_ratio="1:1"             # Square format for social media
)

generate_image(
    prompt="YouTube thumbnail design",
    aspect_ratio="16:9"            # Standard video format
)

generate_image(
    prompt="Mobile wallpaper of mountain vista",
    aspect_ratio="9:16"            # Portrait format for phones
)

📐 Aspect Ratio Control

Control the output image dimensions with the aspect_ratio parameter:

Supported Aspect Ratios:

1:1 - Square (Instagram, profile pictures)
4:3 - Classic photo format
3:4 - Portrait orientation
16:9 - Widescreen (YouTube thumbnails, presentations)
9:16 - Mobile portrait (phone wallpapers, stories)
21:9 - Ultra-wide cinematic
2:3, 3:2, 4:5, 5:4 - Various photo formats

python

# Examples for different use cases
generate_image(
    prompt="Product showcase for e-commerce",
    aspect_ratio="3:4",    # Portrait format, good for product pages
    model_tier="pro"
)

generate_image(
    prompt="Social media banner for Facebook",
    aspect_ratio="16:9"    # Landscape banner format
)

Note: Aspect ratio works with both Flash and Pro models. For best results with specific aspect ratios at high resolution, use the Pro model with resolution="4k".

📁 Output Path Control ⭐ NEW!

Control where generated images are saved with the output_path parameter:

Three modes of operation:

Specific file path - Save to an exact file location:

python

generate_image(
    prompt="A beautiful sunset",
    output_path="/path/to/sunset.png"  # Exact file location
)

Directory path - Use auto-generated filename in a specific directory:

python

generate_image(
    prompt="Product photo",
    output_path="/path/to/products/"  # Trailing slash indicates directory
)

Default location - Uses IMAGE_OUTPUT_DIR or ~/nanobanana-images:

python

generate_image(
    prompt="Random image"
    # output_path defaults to None
)

Multiple images (n > 1): When generating multiple images with a file path, images are automatically numbered:

First image: /path/to/image.png
Second image: /path/to/image_2.png
Third image: /path/to/image_3.png

Precedence Rules:

output_path parameter (if provided) - highest priority
IMAGE_OUTPUT_DIR environment variable
~/nanobanana-images (default fallback)

python

# Save to specific location with Pro model
generate_image(
    prompt="Professional headshot",
    model_tier="pro",
    output_path="/Users/me/photos/headshot.png"
)

# Save multiple images to a directory
generate_image(
    prompt="Product variations",
    n=4,
    output_path="/path/to/products/"  # Each gets unique filename
)

⚙️ Environment Variables

Configuration options:

bash

# Authentication (Required)
# Method 1: API Key
GEMINI_API_KEY=your-gemini-api-key-here

# Method 2: Vertex AI (Google Cloud)
NANOBANANA_AUTH_METHOD=vertex_ai
GCP_PROJECT_ID=your-project-id
GCP_REGION=global  # Required for gemini-3-pro-image-preview and NB2; use "us-central1" only for legacy 2.5 Flash Image

# Model Selection (optional)
NANOBANANA_MODEL=auto  # Options: flash, nb2, pro, auto (default: auto → nb2)

# Optional
IMAGE_OUTPUT_DIR=/path/to/image/directory  # Default: ~/nanobanana-images
GEMINI_BASE_URL=https://custom-api.example.com  # Custom API endpoint (for proxies/gateways)
LOG_LEVEL=INFO                             # DEBUG, INFO, WARNING, ERROR
LOG_FORMAT=standard                        # standard, json, detailed

🐛 Troubleshooting

Common Issues

"GEMINI_API_KEY not set"

Add your API key to the MCP server configuration in your client
Get a free API key at Google AI Studio

"Server failed to start"

Ensure you're using the latest version: uvx nanobanana-mcp-server@latest
Check that your client supports MCP (Claude Desktop 0.10.0+)

"Permission denied" errors

The server creates images in ~/nanobanana-images by default
Ensure write permissions to your home directory

Development Setup

For local development:

bash

# Clone repository
git clone https://github.com/zhongweili/nanobanana-mcp-server.git
cd nanobanana-mcp-server

# Install with uv
uv sync

# Set environment
export GEMINI_API_KEY=your-api-key-here

# Run locally
uv run python -m nanobanana_mcp_server.server

📄 License

MIT License - see LICENSE for details.

🆘 Support

Issues: GitHub Issues
Discussions: GitHub Discussions

Install

Configuration

Environment variables

GEMINI_API_KEYrequiredsecret

Your Gemini API key

IMAGE_OUTPUT_DIR

The image output directory

claude_desktop_config.json

{
  "mcpServers": {
    "nanobanana-mcp-server": {
      "command": "uvx",
      "args": [
        "nanobanana-mcp-server"
      ],
      "env": {
        "GEMINI_API_KEY": "<YOUR_GEMINI_API_KEY>",
        "IMAGE_OUTPUT_DIR": "<YOUR_IMAGE_OUTPUT_DIR>"
      }
    }
  }
}