What problem does it solve? Animation code often ships with subtle craft problems — 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 a strict, opinionated standards catalog so these issues are caught before merge. ## Core Features & Use Cases - Standards-based review: Evaluates every animation against ten non-negotiable rules covering easing curves, sub-300ms durations, transform origins, interruptibility, GPU-only properties, and accessibility. - Structured findings output: Produces a Before/After/Why findings table plus a tiered verdict (feel-breaking regressions, performance, timing, accessibility) ending in an explicit Block or Approve decision. - Precise citations: Pulls exact cubic-bezier curves, duration budgets, and spring configurations from STANDARDS.md instead of approximating values. - Use Case: A developer opens a pull request adding a dropdown menu with transition: all 300ms ease-in. The review flags the unbounded property animation and ease-in curve, recommends transition: transform 200ms with a strong custom ease-out, and blocks the PR until fixed. ## Quick Start Ask the agent to review the animation and motion code in your current diff or pull request for craft and performance issues.
