A design constraint can define what an interface must do, include, avoid, or preserve. Constraints may come from users, brand rules, accessibility, platform behavior, content, performance, technical limits, or deliberate visual direction.
Clear constraints help AI generation avoid generic defaults and make review more objective. They should express the intended outcome or boundary without prescribing incidental details that prevent a better solution.
ELI5
A design constraint is a rule that helps keep design choices inside the needs of a product. It can state something required, something forbidden, or a limit the interface must respect.
For example, a project may require readable contrast and consistent spacing while forbidding decorative emoji in navigation. Those constraints give an AI agent clearer guidance than asking for a generally polished design.
