Use when a web project needs animation or motion-tool selection across native CSS/WAAPI/View Transitions, Motion, Anime.js, GSAP, Lenis, scroll choreography, SVG/text animation, or synchronized motion systems.
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See how to installReview the instructions the agent will receive before you install.
Read references/tool-router.md and references/capability-matrix-2026.md and choose the smallest engine that cleanly implements the interaction.
Use CSS transitions/keyframes, WAAPI, CSS Scroll-Driven Animations or View Transitions when they cover the behavior cleanly.
Prefer for React state/layout/shared-layout, presence, gestures, springs and common scroll-linked UI motion. Read references/motion.md.
Prefer for precise lightweight timelines, staggered choreography, SVG/text/value animation and deterministic sequencing. Read references/animejs.md.
Prefer for advanced multi-part timelines, ScrollTrigger pin/scrub, Flip, SplitText, MotionPath and complex scroll/DOM/3D orchestration. Read references/gsap-lenis.md.
Use only when smooth scrolling or a normalized scroll signal is an intentional part of the experience. Native scroll remains the default.
For notable motion, record: Intent → Engine → Why → Reduced-motion behavior → Performance risk.
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Use for release-level accessibility and performance review, including WCAG 2.2 AA, keyboard/focus, target size, reduced motion, semantic controls, Core Web Vitals, images/fonts/JavaScript, and animation or 3D performance budgets.
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Use to audit a generated or heavily templated interface for generic AI aesthetics, unjustified trend patterns, component-registry residue, vague copy, repetitive motion, novelty theater, or visual decisions that lack brand/UX rationale.
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Use when a website needs a strong visual point of view, distinct concept routes, composition, typography, color/materiality, imagery direction, spatial rhythm, or a memorable signature idea.
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Use when deciding whether to implement UI from native HTML/CSS, accessible primitives, shadcn-style source components, or visual component registries such as 21st.dev, Aceternity, React Bits, Motion Primitives, Magic UI, or Animate UI.
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Use after substantial web projects or repeated design defects to convert evidence into reusable skill improvements through root-cause analysis, regression scenarios, and controlled proposals without silently changing the core OS.
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Use when the design concept calls for Three.js or React Three Fiber 3D, WebGL/WebGPU, Rive, Spline, Theatre.js, SVG, canvas, shaders, particle systems, or other immersive creative-web techniques.
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