Review animation and motion code against craft standards

A specialized motion and animation code-review skill that does one thing: reviews animation and motion code against a high craft bar, then issues an explicit Block or Approve verdict. It declines to review general code, write features, or fix unrelated bugs, pointing those requests to a general review skill instead. Its substantive standards come from Emil Kowalski's animation philosophy (animations.dev); its review method - non-negotiable standards, escalation triggers, a remedial hierarchy, tiered output, explicit approval criteria - is adapted from aggressive code-quality review practice, with a full rule catalog of exact easing curves, duration tables, and spring configs in a companion STANDARDS.md. It measures every animation in a diff against ten non-negotiable standards: motion must be justified rather than just "looks cool," frequency-appropriate so 100+/day or keyboard-triggered actions get no animation, entering/exiting elements use ease-out or a custom curve rather than ease-in, UI animations stay under 300ms without justification, popovers, dropdowns, and tooltips scale from their trigger via transform-origin rather than center with modals exempt, rapidly-triggered motion must be interruptible via retargeting transitions or springs rather than restart-from-zero keyframes, only transform/opacity are animated and never layout properties like width, height, margin, or top/left, prefers-reduced-motion is honored by dropping movement while keeping opacity and color, deliberate actions animate slower than system responses for asymmetric enter/exit, and motion cohesion matches the component's personality and the product. It lists specific escalation triggers to flag on sight - transition: all, scale(0) entrances, ease-in on UI, animation on keyboard or high-frequency actions, missing reduced-motion handling, ungated :hover motion - and a nine-step remedial preference hierarchy running from deleting the animation entirely, through reducing it, fixing easing, fixing origin and physicality, making it interruptible, moving it to GPU-only properties, fixing asymmetric timing, polish, and finally accessibility and cohesion tuning. Required output is exactly two parts: a findings table with Before/After/Why columns, never a prose before/after list, and a verdict section grouping remaining commentary into six impact tiers from feel-breaking regressions down to accessibility, closing with an explicit Block or Approve decision that cites file:line and pulls exact values from STANDARDS.md rather than approximating.

Use it when the user asks for an animation, motion, or interaction review, or a frontend diff changes CSS transitions, keyframes, Framer Motion, WAAPI, hover effects, gestures, toasts, modals, drawers, popovers, or loaders and needs a strict review verdict. It reviews motion and animation only - it should not replace a general code review, accessibility audit, or product design critique, and it does not implement fixes unless separately asked. If asked to review general code, it declines and points to a general review skill; final approval may still require browser, slow-motion, or real-device testing for gestures and highly visual interactions.

Input is a diff or code snippet containing animation or motion changes. Output is a required two-part review: a findings table and a tiered verdict ending in an explicit Block/Approve decision, for example:

| Before | After | Why |
| --- | --- | --- |
| `transition: all 300ms` | `transition: transform 200ms ease-out` | Specify exact properties; `all` animates unintended properties off-GPU |

Grounded in Emil Kowalski's animations.dev philosophy and a companion STANDARDS.md rule catalog covering easing curves, duration tables, spring configs, gestures, clip-path, performance, and accessibility; applies to CSS transitions and keyframes, Framer Motion, and the Web Animations API (WAAPI).

Frontend engineers and reviewers who need a strict, craft-focused verdict on animation and motion changes rather than a general code review that treats motion as an afterthought.