Ultimate Gemini MCP

MCP server for Google's Gemini 3.1 Flash Image — fast image generation with advanced reasoning, 512px–4K resolution, up to 14 reference images, Google Search grounding, and automatic thinking mode.

All generated images include invisible SynthID watermarks for authenticity and provenance tracking.

Features

Gemini 3.1 Flash Image

• High-Resolution Output: 512px, 1K, 2K, and 4K resolution

• Advanced Text Rendering: Legible, stylized text in infographics, menus, diagrams, and logos

• Up to 14 Reference Images: Up to 10 objects + 4 characters for style/character consistency

• Google Search Grounding: Real-time data (weather, stocks, events, maps)

• Google Image Search: Visual context from web images — the model can FIND real images of anything

• Thinking Mode: Configurable reasoning - "minimal" (fast) or "high" (best quality)

This model is different. Unlike traditional image generators that rely solely on training data, Gemini 3.1 Flash has live access to Google Search and Image Search. It can find actual references for products, people, events, or anything that exists online. "Way of Wade 12" → generates the REAL shoe. "Tony Hawk" → finds real photos. Don't over-prompt — let the model cook.

Server Features

• Batch Processing: Generate multiple images in parallel (up to 8 concurrent)

• 22 Expert Prompt Templates: MCP slash commands for photography, logos, cinematics, storyboards, and more

• Flexible Aspect Ratios: 14 options — 1:1, 1:4, 1:8, 2:3, 3:2, 3:4, 4:1, 4:3, 4:5, 5:4, 8:1, 9:16, 16:9, 21:9

• Configurable via Environment Variables: Output directory, default size, timeouts, and more

Showcase

Photorealistic Capabilities

Jensen Huang — GPU Surfing

Elon Musk — Mars Chess Match

Jensen Huang — GPU Kitchen

Elon Musk — Cybertruck Symphony

Jensen Huang — Underwater Data Center

Elon Musk — SpaceX Skateboarding

Google Search Grounding

Current Weather in San Francisco

Google Image Search

Butterfly on Flower

Different Resolutions

512px (fastest)

1K

2K

Quick Start

Prerequisites

• Python 3.11+

• Google Gemini API key (free tier available)

Installation

Using uvx (recommended — no install needed):

uvx ultimate-gemini-mcp@latest

Note: Use @latest to ensure uv always fetches the newest version from PyPI. Without it, uv may use a cached environment.

Using pip:

pip install ultimate-gemini-mcp

From source:

git clone https://github.com/anand-92/ultimate-image-gen-mcp
cd ultimate-image-gen-mcp
uv sync

Setup

Claude Desktop

Add to claude_desktop_config.json:

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

Config file locations:

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

• Windows: %APPDATA%\Claude\claude_desktop_config.json

macOS spawn uvx ENOENT error: Use the full path — find it with which uvx, then set "command": "/Users/you/.local/bin/uvx".

Claude Code

claude mcp add ultimate-gemini \
  --env GEMINI_API_KEY=your-api-key \
  -- uvx ultimate-gemini-mcp@latest

Cursor

Add to .cursor/mcp.json:

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

Images are saved to ~/gemini_images by default. Add "OUTPUT_DIR": "/your/path" to customize.

Tools

generate_image

Generate an image with Gemini 3.1 Flash Image.

Image size guide:

• 512px — fastest, lowest cost (0.5K)

• 1K — fast, good for testing (~1-2 MB)

• 2K — recommended for most use cases (~3-5 MB)

• 4K — maximum quality for production assets (~8-15 MB)

batch_generate

Generate multiple images in parallel.

MCP Prompt Templates

22 expert prompt templates are available as MCP slash commands in Claude Code (type / to browse). Each template returns a crafted prompt and recommended parameters ready to pass directly to generate_image or batch_generate.

Configuration

Troubleshooting

spawn uvx ENOENT — Claude Desktop can't find uvx. Use the full path:

"command": "/Users/yourusername/.local/bin/uvx"

Find it with: which uvx

GEMINI_API_KEY not found — Set the key in your MCP config env block or in a .env file. Get a free key at Google AI Studio.

Content blocked by safety filters — Rephrase the prompt to avoid sensitive content.

Rate limit exceeded — Wait and retry, or upgrade your API quota.

Images not saving — Check OUTPUT_DIR exists and is writable: mkdir -p /your/output/path.

License

MIT — see LICENSE for details.

Links

• Google AI Studio — Get your API key

• Gemini API Docs

• Model Context Protocol

• FastMCP