Use when several visual variants need to be compared side by side — mockups, layouts, or a range of one value (spacing, radius, shadow, color, motion) — or when you are about to ask the user to pick between visual options in prose. Renders every candidate in one HTML file, opens it in a browser, lets the user choose by eye, then applies the choice to the code. Not a design generator — it lays out a range, it does not invent a look. Triggers on "5가지 버전으로 보여줘" · "A 랑 B 중에 뭐가 나아" · "시안 여러 개 비교해줘" · "나란히 놓고 보자". Do not use for ordinary UI coding, bug fixes, or implementing a design that is already decided.
