size
"auto", presets like "1024x1024" / "1536x1024" / "1024x1536" / "3840x2160", or (for gpt-image-2) any WxH within the model's constraints (default: "1536x1024"). Accepted values are model-dependent.
How to use it
size is exposed by the Image Gen MCP MCP server. Add the server to your MCP client (Claude Desktop, Cursor, Windsurf and others), and the size tool becomes available to the model automatically. See the full listing for setup details and every tool this server provides.
Install Image Gen MCP
claude mcp add image-gen-mcp /path/to/image-gen-mcp/start-mcp.sh -e PROVIDERS__OPENAI__API_KEY=your-api-key-hereOther tools in Image Gen MCP (11)
"auto" "transparent" "opaque" (default: "auto")
Edit existing images with text instructions.
Generate images from text descriptions using any supported model.
(required): Base64 encoded image or data URL
List all available image generation models and their capabilities.
Optional mask for targeted editing
(optional): Model to use (e.g., "gpt-image-2", "gpt-image-1.5", "dall-e-3", "imagen-4")
"png" "jpeg" "webp" (default: "png")
(required): Text description of desired image
"auto" "high" "medium" "low" (default: "auto")
"vivid" "natural" (default: "vivid")