Artifex MCP

⚠️ UNOFFICIAL TOOL: This is an independent, community-developed MCP server. It is not affiliated with, endorsed by, or supported by Google or OpenAI. Use at your own risk.

MCP (Model Context Protocol) server for AI image generation supporting multiple providers:

• Antigravity (default) - Google's Gemini 3 Pro Image model
• OpenAI - DALL-E 3

Features

• Multi-Provider Support: Switch between Antigravity and OpenAI with a simple parameter
• Text-to-Image: Generate images from text descriptions
• Image Editing: Modify existing images with text instructions (Antigravity only)
• Multiple Outputs: Generate up to 4 image variations per request (Antigravity only)
• Character Consistency: Session-based generation for consistent characters (Antigravity only)
• Multiple Aspect Ratios: 1:1, 16:9, 9:16, 3:4, 4:3, and more

Installation

Run directly with npx (recommended):

npx artifex-mcp

Or install globally:

npm install -g artifex-mcp

Authentication

Antigravity (Default)

npx artifex-mcp --login

This will:

1. Open your browser for Google OAuth
2. Store credentials securely in ~/.config/artifex-mcp/auth.json

OpenAI

Set the OPENAI_API_KEY environment variable:

export OPENAI_API_KEY=sk-...

Usage

As an MCP Server

Add to your MCP client configuration:

Claude Desktop (claude_desktop_config.json):

{
  "mcpServers": {
    "artifex": {
      "command": "npx",
      "args": ["artifex-mcp"],
      "env": {
        "OPENAI_API_KEY": "sk-..."
      }
    }
  }
}

OpenCode:

{
    "mcp": {
        "artifex": {
            "type": "local",
            "command": ["npx", "artifex-mcp"],
            "enabled": true,
            "env": {
                "OPENAI_API_KEY": "sk-..."
            }
        }
    }
}

Environment Variables

Variable	Description	Default
DEFAULT_IMAGE_PROVIDER	Default provider to use	antigravity
DEFAULT_IMAGE_MODEL	Default model for the provider	gemini-3-pro-image
OPENAI_API_KEY	API key for OpenAI provider	-

Provider Selection

Use the model parameter with provider:model format:

# Use Antigravity (default)
generate_image({ prompt: "a cat" })

# Use OpenAI DALL-E 3
generate_image({ prompt: "a cat", model: "openai:dall-e-3" })

# Use a specific Antigravity model
generate_image({ prompt: "a cat", model: "antigravity:gemini-3-pro-image" })

Available Tools

generate_image

Generate images from text prompts.

Parameter	Type	Required	Default	Description
prompt	string	Yes	-	Image description or editing instruction
model	string	No	env default	Provider and model in provider:model format
aspect_ratio	enum	No	"1:1"	1:1, 16:9, 9:16, 3:4, 4:3, 2:3, 3:2, 4:5, 5:4, 21:9
output_path	string	No	cwd	Directory to save images
file_name	string	No	auto	Custom filename
input_image	string	No	-	Path to image for editing (Antigravity only)
count	number	No	1	Number of images 1-4 (Antigravity only)
session_id	string	No	-	For character consistency (Antigravity only)

Examples:

# Default provider (Antigravity)
Generate a cyberpunk cityscape at night

# Using OpenAI
Generate a cyberpunk cityscape at night, model: openai:dall-e-3

# Multiple images (Antigravity only)
Generate 4 variations of a majestic dragon, aspect ratio 16:9

# Character consistency (Antigravity only)
Create a hero named Luna, session_id: luna

auth_status

Check authentication status for a provider.

Parameter	Type	Required	Description
provider	string	No	Provider to check (default: antigravity)

auth_login

Get instructions for authenticating with a provider.

auth_logout

Delete stored credentials for a provider.

quota_status

Check rate limit and quota status for a provider.

Provider Capabilities

Feature	Antigravity	OpenAI
Text-to-Image	✅	✅
Image Editing	✅	❌
Multiple Images	✅ (1-4)	❌ (1 only)
Sessions	✅	❌
Aspect Ratios	✅	✅ (limited)
Auth Type	Google OAuth	API Key

File Locations

Purpose	Location
Credentials	~/.config/artifex-mcp/auth.json
Sessions	~/.cache/artifex-mcp/sessions/
Generated Images	Current working directory (or custom path)

Troubleshooting

"Not authenticated" error (Antigravity)

npx artifex-mcp --login

"OpenAI API key not found" error

Set the environment variable:

export OPENAI_API_KEY=sk-...

Rate limit exceeded

Wait for the time indicated in the error message. Rate limits are enforced per-account.

Unsupported feature error

Some features are only available on specific providers. For example:

• session_id only works with Antigravity
• input_image (editing) only works with Antigravity
• count > 1 only works with Antigravity

License

MIT

Legal

Intended Use

• Personal / internal development only
• Respect quotas and data handling policies
• Not for production services or bypassing intended limits

Warning

By using this plugin, you acknowledge:

• Terms of Service risk — This approach may violate ToS of AI model providers
• Account risk — Providers may suspend or ban accounts
• No guarantees — APIs may change without notice
• Assumption of risk — You assume all legal, financial, and technical risks

Disclaimer

Not affiliated with Google or OpenAI. This is an independent open-source project.

"Antigravity", "Gemini", "Google Cloud", "Google", "OpenAI", and "DALL-E" are trademarks of their respective owners.