What problem does it solve? Animation code often passes review because it technically works while feeling sluggish, firing on high-frequency actions, animating layout properties, or ignoring reduced-motion preferences. This Skill applies a strict, opinionated craft bar to motion code so feel-breaking regressions are caught before merge. ## Core Features & Use Cases - Standards-based review: Measures every animation in a diff against ten non-negotiable rules covering easing curves, sub-300ms durations, transform-origin correctness, GPU-only properties, and interruptibility. - Structured findings output: Produces a Before/After/Why findings table plus a tiered verdict (feel-breaking regressions, performance, accessibility) ending in an explicit Block or Approve decision. - Precise value citations: Pulls exact cubic-bezier curves, duration tables, and spring configs from STANDARDS.md instead of approximating. - Use Case: A pull request adds a dropdown that animates with transition: all 400ms ease-in from scale(0). The review flags the unbounded transition, the ease-in curve, the over-budget duration, and the wrong origin, then prescribes transform 200ms with a strong ease-out from scale(0.95) + opacity anchored to the trigger. ## Quick Start Ask the AI to review the animation and motion code in your current diff against the animation standards and return a findings table with a block-or-approve verdict.
