Directing an agent to prototype installments

My goal

Pressure-test one question fast: does splitting a lump-sum total into monthly rows reduce checkout anxiety, or just add clutter? I wanted a feelable prototype before committing a sprint to it.

Override 1 · Financial tone

The agent's first pass eased over 600ms with a bouncy spring — playful for money — and looped the pulse like a warning. I overrode it: 400ms ease-out, no overshoot, one calm pulse.

Override 2 · Scale & i18n

It also hardcoded a "$" and US date order — silently broken in every other marketplace. I moved formatting to Intl by locale. Try the US / DE / JP switch below the card.

Honest outcome

Feelable, localized prototype in ~25 min vs. a half-day of hand-keyframing. The AI drafted fast; the trust and scale judgment was mine.

reconstruction of a real agent session