ultimate-gemini-mcp 5.0.2

Gemini 3 Pro Image MCP server with advanced features: high-resolution output (1K-4K), reference images (up to 14), Google Search grounding, and thinking mode

Ultimate Gemini MCP

MCP server for Google's Gemini 3 Pro Image Preview — state-of-the-art image generation with advanced reasoning, 1K–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.

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Features

Gemini 3 Pro Image

• High-Resolution Output: 1K, 2K, and 4K resolution
• Advanced Text Rendering: Legible, stylized text in infographics, menus, diagrams, and logos
• Up to 14 Reference Images: Up to 6 object images + up to 5 human images for style/character consistency
• Google Search Grounding: Real-time data (weather, stocks, events, maps)
• Thinking Mode: Model reasons about composition before producing the final image (automatic, always on)

Server Features

• AI Prompt Enhancement: Optionally auto-enhance prompts using Gemini Flash
• 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: 10 options — 1:1, 16:9, 9:16, 3:2, 4:3, 4:5, 5:4, 2:3, 3:4, 21:9
• Configurable via Environment Variables: Output directory, default size, timeouts, and more

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Showcase

Prompt Enhancement

When enhance_prompt: true, simple prompts are transformed into detailed, cinematic descriptions.

Original: "A fierce wolf wearing the black symbiote Spider-Man suit, web-slinging through city at night"

Enhanced: "A powerfully built Alaskan Tundra Wolf, snarling fiercely, wearing the matte black, viscous, wet-looking symbiote suit with exaggerated white spider emblem. Captured mid-air in dramatic web-slinging arc with taut glowing webbing. Extreme low-angle perspective, hyper-realistic neo-noir cityscape at midnight with rain-slicked asphalt. High-contrast cinematic lighting with deep shadows and electric neon rim lighting."

Wolf — Black Symbiote Suit

Lion — Classic Red & Blue Suit

Black Panther — Symbiote Suit

Eagle — Classic Suit in Flight

Grizzly Bear — Symbiote Suit

Fox — Classic Suit at Dusk

All generated with enhance_prompt: true, 2K, 16:9.

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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

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Quick Start

Prerequisites

• Python 3.11+
• Google Gemini API key (free tier available)

Installation

Using uvx (recommended — no install needed):

uvx ultimate-gemini-mcp

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

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Setup

Claude Desktop

Add to claude_desktop_config.json:

{
  "mcpServers": {
    "ultimate-gemini": {
      "command": "uvx",
      "args": ["ultimate-gemini-mcp"],
      "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

Cursor

Add to .cursor/mcp.json:

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

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

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Tools

generate_image

Generate an image with Gemini 3 Pro Image.

Parameter	Type	Default	Description
prompt	string	required	Text description. Use full sentences, not keyword lists.
model	string	gemini-3-pro-image-preview	Model to use (currently only one supported)
enhance_prompt	bool	false	Auto-enhance prompt using Gemini Flash before generation
aspect_ratio	string	1:1	One of: 1:1 2:3 3:2 3:4 4:3 4:5 5:4 9:16 16:9 21:9
image_size	string	2K	1K, 2K, or 4K — must be uppercase K
output_format	string	png	png, jpeg, or webp
reference_image_paths	list	[]	Up to 14 local image paths (max 6 objects + max 5 humans)
enable_google_search	bool	false	Ground generation in real-time Google Search data
response_modalities	list	["TEXT","IMAGE"]	["TEXT","IMAGE"], ["IMAGE"], or ["TEXT"]

Image size guide:

• 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)

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batch_generate

Generate multiple images in parallel.

Parameter	Type	Default	Description
prompts	list	required	List of prompt strings (max 8)
model	string	gemini-3-pro-image-preview	Model for all images
enhance_prompt	bool	true	Enhance all prompts before generation
aspect_ratio	string	1:1	Aspect ratio applied to all images
image_size	string	2K	Resolution for all images
output_format	string	png	Format for all images
response_modalities	list	["TEXT","IMAGE"]	Modalities for all images
batch_size	int	8	Max concurrent requests

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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.

Command	Description	Default aspect ratio
photography_shot	Photorealistic shot with lens/lighting specs	16:9
logo_design	Professional brand identity	1:1, 4K, IMAGE only
cinematic_scene	Film still with cinematography language	21:9
product_mockup	Commercial e-commerce photography	1:1 or 4:5
batch_storyboard	Multi-scene storyboard → calls batch_generate	16:9
macro_shot	Extreme macro with micro-snoot lighting	1:1
fashion_portrait	Editorial fashion with gobo shadow patterns	4:5
technical_cutaway	Stephen Biesty-style cutaway diagram	3:2, 4K, IMAGE only
flat_lay	Overhead knolling photography	1:1
action_freeze	High-speed strobe with motion blur background	16:9
night_street	Moody night street with practical light sources	16:9
drone_aerial	Straight-down golden hour aerial	4:5, 4K, IMAGE only
stylized_3d_render	UE5-style render with subsurface scattering	1:1, IMAGE only
sem_microscopy	Scanning electron microscope false-color	1:1, IMAGE only
double_exposure	Silhouette-blended double exposure	2:3, IMAGE only
architectural_viz	Ray-traced architectural visualization	3:2, 4K
isometric_illustration	Orthographic isometric 3D illustration	1:1, IMAGE only
food_photography	High-end backlit food photography	4:5
motion_blur	Rear-curtain sync slow shutter sequence	16:9
typography_physical	Text embedded in physical environment	16:9, 4K, IMAGE only
retro_futurism	1970s cassette-futurism analog sci-fi	4:3, IMAGE only
surreal_dreamscape	Surrealist impossible physics scene	1:1, IMAGE only
character_sheet	Video game character concept art sheet	3:2, 4K, IMAGE only
pbr_texture	Seamless PBR texture map with raking light	1:1, IMAGE only
historical_photo	Period-accurate photography with film emulation	4:5
bioluminescent_nature	Long-exposure bioluminescence macro	1:1
silhouette_shot	Cinematic pure-black silhouette master shot	21:9, 4K

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Configuration

Variable	Default	Description
GEMINI_API_KEY	—	Required. Google Gemini API key
OUTPUT_DIR	~/gemini_images	Directory where images are saved
DEFAULT_IMAGE_SIZE	2K	Default resolution (1K, 2K, 4K)
DEFAULT_MODEL	gemini-3-pro-image-preview	Default model
ENABLE_PROMPT_ENHANCEMENT	false	Auto-enhance prompts by default
ENABLE_GOOGLE_SEARCH	false	Enable Google Search grounding by default
REQUEST_TIMEOUT	60	API timeout in seconds
MAX_BATCH_SIZE	8	Max parallel requests in batch mode
LOG_LEVEL	INFO	Logging level

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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.

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License

MIT — see LICENSE for details.

Links

• Google AI Studio — Get your API key
• Gemini API Docs
• Model Context Protocol
• FastMCP