animate（动画设计）

When to Use

User needs motion designed or implemented inside a product UI. Agent turns vague requests into motion contracts, stack-specific implementation choices, and testable acceptance criteria across Flutter, React, Next.js, SwiftUI, Compose, React Native, and broader web stacks.

Use this for micro-interactions, navigation transitions, shared-element flows, loading states, gesture feedback, and motion system design. Do not use it for video editing, GIF rendering, or media encoding.

Architecture

Memory lives in ~/animate/. If ~/animate/ does not exist, run setup.md. See memory-template.md for structure and status fields.

~/animate/
|- memory.md             # Durable motion preferences and platform context
|- tokens.md             # Approved duration, easing, and spring ladders
|- patterns.md           # Proven interaction and transition patterns
|- platform-notes.md     # Stack-specific implementation decisions
`- qa.md                 # Regressions, low-end findings, and accessibility notes

Quick Reference

Use the smallest relevant file for the current task.

Core Rules

1. Start from Product Intent and State Change

• Define the trigger, user goal, and state transition before choosing an effect.
• Map motion to one of five jobs: orientation, feedback, continuity, emphasis, or delight.
• If the intent is unclear, do not animate yet.

2. Write a Motion Contract Before Code

Every proposal must specify:

• Trigger and affected surfaces
• Initial state, end state, and reduced-motion fallback
• Duration, easing or spring, delay or stagger, and cancellation behavior
• Acceptance criteria: responsiveness, accessibility, parity, and performance

No vague wording like "smooth" or "premium" without values.

3. Route to the Safest Native Abstraction

Use the highest-level API that solves the job:

• Flutter: implicit animation widgets, AnimatedSwitcher, TweenAnimationBuilder, Hero
• React and Next.js: CSS-first transitions, Motion presence/layout APIs, and router-safe transitions before bespoke choreography
• SwiftUI: withAnimation, content transitions, matchedGeometryEffect
• Compose: animate*AsState, AnimatedVisibility, updateTransition
• React Native: native-thread or worklet-safe animation paths before JS-thread choreography
• Web: CSS transform and opacity, View Transitions, or framework-native transitions before GSAP-level complexity

Avoid low-level animation code when a higher-level primitive already handles interruption and lifecycle.

4. Optimize for Compositor-Safe Motion and Interruption

• Prefer transform, opacity, color, and scale patterns that keep layout stable.
• Avoid width, height, top, left, and layout-driven loops unless the stack provides a dedicated layout animation primitive.
• Define behavior for rapid taps, back gestures, dismiss, re-render, offscreen, and navigation cancel.
• Users should never get stuck behind an animation.

5. Ship Accessible Variants by Default

• Respect reduced-motion and system animation-scale settings.
• Replace large travel, parallax, bounce, blur-heavy flourishes, and infinite loops with calmer equivalents.
• Never rely on movement alone to communicate status.
• Keep focus order, screen reader output, and hit targets stable during motion.

6. Cover Real Product States, Not Only the Happy Path

• Animate loading, success, error, empty, disabled, retry, and optimistic-update states when relevant.
• Coordinate navigation, overlays, lists, forms, and async data so motion still works with latency and content changes.
• Deliver a sober V1 first, then a more expressive V2 only when constraints allow.

7. Verify with Previews, Tests, and Device Reality

• Leave deterministic previews, stories, or demo toggles for the motion states you touched.
• Add or update behavior, E2E, or visual tests when the app stack supports them.
• Validate reduced motion, mid-tier performance, and interrupted flows before calling it done.

Common Traps

• Pretty animation without a user-facing reason -> extra motion, less clarity.
• Hardcoded timings per screen -> inconsistent product feel and painful iteration.
• JS or main-thread choreography for critical mobile motion -> dropped frames under load.
• Animating only happy-path states -> broken UX on loading, error, or rapid retries.
• Missing cancellation rules -> stuck overlays, ghost states, or navigation glitches.
• Shipping only one variant -> accessibility regressions and poor low-end performance.

Security & Privacy

Data that leaves your machine:

• None by default from this skill itself.

Data that stays local:

• Motion preferences, approved tokens, platform notes, and QA learnings under ~/animate/.

This skill does NOT:

• Upload builds, videos, or telemetry automatically.
• Modify files outside ~/animate/ for memory.
• Disable accessibility settings.
• Modify its own SKILL.md.

Related Skills

Install with clawhub install <slug> if user confirms:

• flutter - Widget lifecycles and performance rules useful for Flutter motion.
• react - Component and rendering patterns that shape animation behavior in React apps.
• react-native - Mobile lifecycle and animation-thread constraints for React Native.
• swift - Swift and SwiftUI implementation patterns for Apple platforms.
• android - Android and Compose implementation details for native motion.

Feedback

• If useful: clawhub star animate
• Stay updated: clawhub sync