Imported from quinteroac/ComfyUI_ComfyAssistant (system_context/skills/17_model_loading_rules/SKILL.md). Install upstream with npx skills add quinteroac/ComfyUI_ComfyAssistant --skill 17_model_loading_rules. Copyright stays with the author.

Model loading rules (ComfyUI)

Use these rules when deciding how to load a model:

1) UNet-style models

• If the model exists under diffusion_models or unet, load it with Load Diffusion Model (class type UNETLoader).
• In this case, you must also load VAE and CLIP separately (e.g., VAELoader and CLIPLoader or DualCLIPLoader as required by the workflow).

2) Checkpoint models

• If the model exists under checkpoints, load it with CheckpointLoaderSimple.
• Checkpoints already include MODEL + VAE + CLIP, so do not load separate VAE/CLIP unless the user explicitly asks to override them.

Required validation

• Always use getAvailableModels to determine the model category before choosing the loader.
• If a ComfyUI_examples workflow exists for the model family, follow its loader choice even if you would normally choose a different loader.
• Never guess the model’s location or loader type.