What problem does it solve? Animation code often ships with subtle craft defects — sluggish easing, wrong transform origins, non-GPU properties, missing reduced-motion handling — that make interfaces feel slow or broken even when they technically work. This Skill applies a strict, opinionated review bar to motion code so those issues are caught before merge. ## Core Features & Use Cases - Ten non-negotiable standards: Checks every animation for justified motion, frequency-appropriateness, responsive easing, sub-300ms UI durations, physical correctness, interruptibility, GPU-only properties, accessibility, asymmetric timing, and cohesion. - Escalation triggers and remedial hierarchy: Flags known anti-patterns on sight (transition: all, scale(0), ease-in on UI, keyframes on toasts) and proposes fixes in a preferred order from deletion to polish. - Structured output: Produces a findings table plus a tiered verdict ending in an explicit Block or Approve decision, citing exact values from the bundled STANDARDS.md reference. - Use Case: A developer opens a pull request adding a dropdown menu animation. The review flags transform-origin: center, a 400ms duration, and missing prefers-reduced-motion handling, then supplies the corrected cubic-bezier curve and origin-aware CSS. ## Quick Start Ask the assistant to review the animation and transition code in your current diff or pull request against motion craft standards.
