audit-motion

name	audit-motion
description	Check new CSS / JSX for animation that runs by default — the project default is `motion: reduced` and any motion must gate on prefers-reduced-motion.

audit-motion

Pre-flight check for any UI change that adds animation. The profile default per ADR 0004 is motion: reduced — i.e. no animation runs unless the user has explicitly opted in. The prefers-reduced-motion CSS media query is the floor; the profile preference is the ceiling.

Authoritative references:

• ADR 0004: docs/decisions/0004-profile-schema-design.md — "no animation by default" is one of the lived-experience-led defaults.
• Profile schema: packages/core/schemas/profile.schema.json (preferences.motion: reduced | system | full).

When to use

• Before merging any PR that changes .css, .scss, .tsx, or .jsx in packages/extension-browser/ or any docs site source.
• When adding a new component that uses animation libraries (framer, gsap, motion).
• Before an extension release — failing this check means a regression ships to users.

What it does

1. Runs git diff origin/main...HEAD --name-only and filters to .css, .scss, .tsx, .jsx, .ts, .js under packages/extension-browser/, docs/, and any other site source.
2. For each file, scans added lines for animation tokens:
   • transition: / transition- (Tailwind)
   • animation: / animation- (Tailwind)
   • @keyframes
   • framer-motion imports
   • gsap / ScrollTrigger imports
   • animate() / <motion. JSX usage
3. For each hit, verifies that either the surrounding context is inside an @media (prefers-reduced-motion: no-preference) block (CSS) or the component reads useReducedMotion() / the profile's preferences.motion before triggering motion (JSX).
4. Reports unguarded hits.

How to invoke

There is no scripted runner yet. Suggested invocation:

git diff origin/main...HEAD --name-only \
  | grep -E '\.(css|scss|tsx|jsx|ts|js)$' \
  | xargs -I{} grep -nHE \
    'transition[:-]|animation[:-]|@keyframes|framer-motion|from .gsap|<motion\.|animate\(' \
    {}

Then for each hit, confirm guard:

• CSS: a parent @media (prefers-reduced-motion: no-preference) { ... }
• JSX: a check against useReducedMotion() or the profile preference

The required guard pattern

CSS

.card {
  /* Static styles always run */
  opacity: 1;
}

@media (prefers-reduced-motion: no-preference) {
  .card {
    transition: opacity var(--duration-normal) var(--ease-out-expo);
  }
}

React / JSX

const reduced = useReducedMotion();
// ...
<div style={{ transition: reduced ? "none" : "opacity 300ms" }}>

Or, when honouring the profile preference (skill-side):

const { motion } = useProfilePreferences();
if (motion === "reduced") return <Static />;
return <Animated />;

Output format

packages/extension-browser/src/popup/Welcome.tsx:42: <motion.div> — no useReducedMotion / profile guard
packages/extension-browser/src/styles/card.css:18: transition: opacity 200ms — no prefers-reduced-motion media query

Exit non-zero on any unguarded hit.

Limitations

• Heuristic regex; will produce false positives on string literals that contain the word transition outside CSS context.
• Does not detect motion implemented via canvas / WebGL / SVG SMIL — review those by hand.
• Does not enforce the profile preference at runtime — that is the responsibility of the component and the skill SDK (@neurodock/skill-sdk / neurodock-skill).

Voice

When flagging an unguarded animation, name the user impact in one line: "this animates on first load for every ND user with the default profile." Do not lecture about vestibular sensitivity; the contributor either already knows or will look it up.