Generate an image from a text prompt using ComfyUI's default txt2img workflow. Returns one or more image URLs served directly by the ComfyUI instance.

Generate multiple variations of the same prompt by varying the seed. Useful for picking the best result or exploring a concept.

Submit an arbitrary ComfyUI workflow (full node graph) and return the resulting image URLs. Use this when you need a custom workflow like ControlNet, upscaling, or a node graph exported from ComfyUI's 'Save (API Format)'.

Refine an existing image using img2img: fetch the source image, upload it to ComfyUI, and run a denoising pass guided by the prompt. Lower denoise preserves more of the original; higher denoise gives more freedom to the prompt.

Upscale an image using a loaded upscaler model (ESRGAN, SwinIR, etc.). Fetches the source image, uploads to ComfyUI, runs the upscale node, and returns the output URL. Requires at least one upscaler model in ComfyUI's models/upscale_models/ directory.

List available models or samplers on the ComfyUI instance. Use this to discover valid values for the 'checkpoint' parameter of other tools, or to see what LoRAs and samplers are installed.

List built-in workflow templates shipped with this MCP server. These are the named workflows that can be used as a baseline; for arbitrary workflows use generate_with_workflow.

Upload a reference image to ComfyUI for use in img2img, ControlNet, or IP-Adapter workflows. Accepts either a source URL (will be fetched) or base64-encoded image data. Returns the stored filename for use as 'image' in workflow nodes like LoadImage.

Generate an image conditioned by a ControlNet preprocessed image (pose, depth, canny, etc.) plus a prompt. Requires a ControlNet model installed in ComfyUI's models/controlnet/ directory. The control_image_url must already be the preprocessed conditioning image — this tool does not run preprocessors itself.

Generate an image using a reference image as an IP-Adapter visual/style/subject guide. Requires the ComfyUI-IPAdapter-plus custom node pack and the preset's matching models (IPAdapter weights + CLIP vision). Weight tunes how strongly the reference guides generation.

Save a ComfyUI workflow JSON to the server's template registry under a named slot. Overwrites are disabled by default.

List all saved workflow templates in the registry.

Fetch a saved workflow template's JSON and metadata.

Delete a saved workflow template.

Run a saved workflow template against ComfyUI and return the resulting image URLs.