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 reviews motion code against ten non-negotiable standards derived from Emil Kowalski's design engineering philosophy, flagging violations with concrete fixes. ## Core Features & Use Cases - Standards-Based Review: Measures every animation in a diff against ten rules covering justified motion, frequency-appropriateness, easing, sub-300ms durations, origin correctness, interruptibility, GPU-only properties, accessibility, asymmetric timing, and cohesion. - Escalation Triggers & Remedial Hierarchy: Hard-flags patterns like transition: all, scale(0), ease-in on UI, and layout-property animation, then proposes fixes in a preferred order from deletion to polish. - Structured Output: Produces a findings table (Before/After/Why) 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 all three issues, cites the 150–250ms dropdown budget and trigger-anchored origin rule, and blocks approval until fixed. ## Quick Start Ask the AI to review the animation and motion code in your current diff or pull request against the animation craft standards.
