Stability Control Skech

Let's be blunt: "Stability Control Skech" is not a real node. There is no Stability Control Skech class in the official Stability API pack - the pack's source registers Stability Control Sketch (spelled correctly), and this page exists because a misspelled version of that name got picked up from a shared workflow somewhere. It happens: someone typed Skech into a node name, the workflow got passed around, and the typo took on a life of its own as a search term.

So if you landed here because a workflow you downloaded references "Stability Control Skech," here's the practical truth: it's the Stability Control Sketch node, doing the same thing with the same inputs, just under a name that ComfyUI's node registry doesn't actually ship. In a working workflow you'd use the correctly-spelled node.

What it does

Control Sketch is the "scribble in, scene out" node from the pack's control family. You feed it a rough sketch or line drawing plus a prompt, and Stability's servers render a full image that follows the sketch's layout - think a ControlNet scribble/lineart model, but hosted, with no preprocessor to install and no model weights to match to your checkpoint.

The inputs you'll actually touch, per the schema this page carries:

• image - your sketch or line art. Hand-drawn or produced by a local lineart/scribble preprocessor, either works.
• prompt - what the sketch becomes.
• control_strength (default 0.7, 0.01–1.0) - how strictly the output follows the sketch. Low lets the model interpret loosely; high keeps it glued to your lines.
• negative_prompt and seed - the usual steering and reproducibility.

Output is a single IMAGE tensor, ready for Save Image or whatever comes next.

Installing it

Same pack, same install: ComfyUI Manager → search "Stability API nodes for ComfyUI", or:

cd ComfyUI/custom_nodes
git clone https://github.com/Stability-AI/ComfyUI-SAI_API
# restart ComfyUI

It's a cloud node, so you also need a Stability API key (SAI_API_KEY env var, a sai_platform_key.txt file beside the node, or the per-node api_key_override) and credits on the account.

If you're troubleshooting

If a workflow says "Skech" and ComfyUI complains the node doesn't exist, edit the node's class to Stability Control Sketch - the inputs line up one-to-one. Everything else in the sketch-control workflow (how the sketch is made, how strong the control is, which format you save) behaves exactly as described on the Control Sketch page. Consider this the FAQ entry for a typo that refuses to die.