Drawing in /sketch does not use credits. Asking an AI agent to process the reference or generate images and videos can use credits.
You can prepare the drawing before requesting AI work. To review media generation before it starts, choose Always ask before generating in the chat’s generation permission settings. Agent processing can still use credits even when no new media is generated. See How credits are charged when using AI Agents for the full explanation.
👉 Related guide: How credits are charged when using AI Agents