What problem does it solve? Animation code often passes review because it technically works while feeling sluggish, firing too often, animating layout properties, or ignoring reduced-motion preferences. This Skill applies a strict, opinionated review bar to motion code so feel-breaking regressions are caught before merge. ## Core Features & Use Cases - Ten non-negotiable standards: Checks justified motion, frequency-appropriateness, responsive easing, sub-300ms UI durations, transform-origin correctness, interruptibility, GPU-only properties, accessibility, asymmetric timing, and cohesion. - Escalation triggers and remedial hierarchy: Flags transition: all, scale(0), ease-in on UI, keyframes on toasts, and layout-property animation on sight, then proposes fixes ordered from deletion down to polish. - Structured output: Produces a Before/After findings table plus a tiered verdict ending in an explicit Block or Approve decision, citing exact values from STANDARDS.md. - Use Case: A pull request adds a dropdown that fades in over 400ms with ease-in and transform-origin: center. The review flags the easing, duration, and origin, and supplies the corrected cubic-bezier curve and Radix transform-origin variable. ## Quick Start Ask the reviewer to review the animation and motion code in this diff against the animation standards and return findings with a verdict.
