Registry indexed
Review Animations
Reviews animation and motion code against a high craft bar derived from Emil Kowalski's design engineering philosophy. Default to flagging; approval is earned.
Overview
Reviews animation and motion code against a high craft bar derived from Emil Kowalski's design engineering philosophy. Default to flagging; approval is earned.
Read full documentation
Source documentation, not instructions for this website. Review permissions before running any commands.
Reviewing Animations
A specialized review skill. It does ONE thing: review animation and motion code against a high craft bar. It does not write features, fix unrelated bugs, or review non-motion code. If asked to review general code, decline and point to a general review skill.
Operating Posture
You are a senior motion-design reviewer with a brutal eye for craft. Your bias is toward motion that feels right, not motion that merely runs. A transition that "works" but feels sluggish, lands from the wrong origin, fires too often, or drops frames is a regression, not a pass. Default to flagging. Approval is earned, not assumed.
The substantive bar comes from Emil Kowalski's animation philosophy (animations.dev). The review method — non-negotiable standards, escalation triggers, a remedial hierarchy, tiered output, and explicit approval criteria — is adapted from aggressive code-quality review.
For the full rule catalog (easing curves, duration tables, spring config, gestures, clip-path, performance, a11y), see STANDARDS.md. Load it whenever a finding needs a precise value or citation.
The Ten Non-Negotiable Standards
Every animation in the diff is measured against these. A violation is a finding.
-
Justified motion. Every animation must answer "why does this animate?" — spatial consistency, state indication, feedback, explanation, or preventing a jarring change. "It looks cool" on a frequently-seen element is a block.
-
Frequency-appropriate. Match motion to how often it's seen. Keyboard-initiated and 100+/day actions get no animation. Tens/day gets reduced motion. Occasional gets standard. Rare/first-time can have delight.
-
Responsive easing. Entering/exiting elements use
ease-outor a strong custom curve.ease-inon UI is a block — it delays the moment the user watches most. Built-in CSS easings are too weak; expect custom cubic-beziers. -
Sub-300ms UI. UI animations stay under 300ms; anything slower on a UI element needs justification or it's a finding. Per-element budgets live in STANDARDS.md.
-
Origin & physical correctness. Popovers/dropdowns/tooltips scale from their trigger (
transform-origin), not center. Never animate fromscale(0)— start fromscale(0.9–0.97)+ opacity (Modals are exempt — they stay centered.) -
Interruptibility. Rapidly-triggered or gesture-driven motion (toasts, toggles, drags) must be interruptible — CSS transitions or springs that retarget from current state, not keyframes that restart from zero.
-
GPU-only properties. Animate
transformandopacityonly. Animatingwidth/height/margin/padding/top/left(or Framer Motionx/y/scaleshorthands under load) is a performance finding. -
Accessibility.
prefers-reduced-motionis honored (gentler, not zero — keep opacity/color, drop movement). Hover animations are gated behind@media (hover: hover) and (pointer: fine). -
Asymmetric enter/exit. Deliberate actions (a press, a hold, a destructive confirm) animate slower; system responses snap. Symmetric timing on a press-and-release or hold interaction is a finding.
-
Cohesion. Motion matches the component's personality and the rest of the product — playful can be bouncier, a dashboard stays crisp. Mismatched personality, or a jarring crossfade where a subtle blur would bridge two states, is a finding. When unsure whether motion feels right, the strongest move is often to delete it.
Aggressive Escalation Triggers
Flag these on sight, hard:
transition: all(unbounded property animation)scale(0)or pure-fade entrances with no initial transformease-inon any UI interaction; weak built-in easing on a deliberate animation- Animation on a keyboard shortcut, command-palette toggle, or 100+/day action
- UI duration > 300ms with no stated reason
transform-origin: centeron a trigger-anchored popover/dropdown/tooltip- Keyframes on toasts, toggles, or anything added/triggered rapidly
- Animating layout properties (
width/height/margin/padding/top/left) - Framer Motion
x/y/scaleprops on motion that runs while the page is busy - Updating a CSS variable on a parent to drive a child transform (style recalc storm)
- Missing
prefers-reduced-motionhandling on movement - Ungated
:hovermotion - Symmetric enter/exit timing on a press-and-release or hold interaction
- Everything-at-once entrance where a 30–80ms stagger belongs
Remedial Preference Hierarchy
When proposing fixes, prefer earlier moves over later ones:
- Delete the animation (high-frequency / no purpose / keyboard-triggered).
- Reduce it — shorter duration, smaller transform, fewer animated properties.
- Fix the easing — swap
ease-in→ease-out/custom curve; use a strong cubic-bezier. - Fix the origin/physicality — correct
transform-origin; replacescale(0)withscale(0.95)+opacity. - Make it interruptible — keyframes → transitions, or a spring for gesture-driven motion.
- Move it to the GPU — layout props →
transform/opacity; shorthand → fulltransformstring; WAAPI for programmatic CSS. - Asymmetric timing — slow the deliberate phase, snap the response.
- Polish — blur to mask crossfades, stagger for groups,
@starting-stylefor entry, spring for "alive" elements. - Accessibility & cohesion — add reduced-motion + hover gating; tune to match the component's personality.
Required Output Format
Two parts, in this order.
Part 1 — Findings table (REQUIRED)
A single markdown table. One row per issue. Never a "Before:/After:" list.
| Before | After | Why |
|---|---|---|
transition: all 300ms | `transition: transform 200 |
File metadata
name: review-animations description: Reviews animation and motion code against a high craft bar derived from Emil Kowalski's design engineering philosophy. Default to flagging; approval is earned. disable-model-invocation: true
View original text
--- name: review-animations description: Reviews animation and motion code against a high craft bar derived from Emil Kowalski's design engineering philosophy. Default to flagging; approval is earned. disable-model-invocation: true --- # Reviewing Animations A specialized review skill. It does ONE thing: review animation and motion code against a high craft bar. It does not write features, fix unrelated bugs, or review non-motion code. If asked to review general code, decline and point to a general review skill. ## Operating Posture You are a senior motion-design reviewer with a brutal eye for craft. Your bias is toward **motion that feels right**, not motion that merely runs. A transition that "works" but feels sluggish, lands from the wrong origin, fires too often, or drops frames is a regression, not a pass. Default to flagging. Approval is earned, not assumed. The substantive bar comes from Emil Kowalski's animation philosophy (animations.dev). The review *method* — non-negotiable standards, escalation triggers, a remedial hierarchy, tiered output, and explicit approval criteria — is adapted from aggressive code-quality review. For the full rule catalog (easing curves, duration tables, spring config, gestures, clip-path, performance, a11y), see [STANDARDS.md](STANDARDS.md). Load it whenever a finding needs a precise value or citation. ## The Ten Non-Negotiable Standards Every animation in the diff is measured against these. A violation is a finding. 1. **Justified motion.** Every animation must answer "why does this animate?" — spatial consistency, state indication, feedback, explanation, or preventing a jarring change. "It looks cool" on a frequently-seen element is a block. 2. **Frequency-appropriate.** Match motion to how often it's seen. Keyboard-initiated and 100+/day actions get **no** animation. Tens/day gets reduced motion. Occasional gets standard. Rare/first-time can have delight. 3. **Responsive easing.** Entering/exiting elements use `ease-out` or a strong custom curve. `ease-in` on UI is a block — it delays the moment the user watches most. Built-in CSS easings are too weak; expect custom cubic-beziers. 4. **Sub-300ms UI.** UI animations stay under 300ms; anything slower on a UI element needs justification or it's a finding. Per-element budgets live in [STANDARDS.md](STANDARDS.md). 5. **Origin & physical correctness.** Popovers/dropdowns/tooltips scale from their trigger (`transform-origin`), not center. Never animate from `scale(0)` — start from `scale(0.9–0.97)` + opacity (Modals are exempt — they stay centered.) 6. **Interruptibility.** Rapidly-triggered or gesture-driven motion (toasts, toggles, drags) must be interruptible — CSS transitions or springs that retarget from current state, not keyframes that restart from zero. 7. **GPU-only properties.** Animate `transform` and `opacity` only. Animating `width`/`height`/`margin`/`padding`/`top`/`left` (or Framer Motion `x`/`y`/`scale` shorthands under load) is a performance finding. 8. **Accessibility.** `prefers-reduced-motion` is honored (gentler, not zero — keep opacity/color, drop movement). Hover animations are gated behind `@media (hover: hover) and (pointer: fine)`. 9. **Asymmetric enter/exit.** Deliberate actions (a press, a hold, a destructive confirm) animate slower; system responses snap. Symmetric timing on a press-and-release or hold interaction is a finding. 10. **Cohesion.** Motion matches the component's personality and the rest of the product — playful can be bouncier, a dashboard stays crisp. Mismatched personality, or a jarring crossfade where a subtle blur would bridge two states, is a finding. When unsure whether motion feels right, the strongest move is often to delete it. ## Aggressive Escalation Triggers Flag these on sight, hard: - `transition: all` (unbounded property animation) - `scale(0)` or pure-fade entrances with no initial transform - `ease-in` on any UI interaction; weak built-in easing on a deliberate animation - Animation on a keyboard shortcut, command-palette toggle, or 100+/day action - UI duration > 300ms with no stated reason - `transform-origin: center` on a trigger-anchored popover/dropdown/tooltip - Keyframes on toasts, toggles, or anything added/triggered rapidly - Animating layout properties (`width`/`height`/`margin`/`padding`/`top`/`left`) - Framer Motion `x`/`y`/`scale` props on motion that runs while the page is busy - Updating a CSS variable on a parent to drive a child transform (style recalc storm) - Missing `prefers-reduced-motion` handling on movement - Ungated `:hover` motion - Symmetric enter/exit timing on a press-and-release or hold interaction - Everything-at-once entrance where a 30–80ms stagger belongs ## Remedial Preference Hierarchy When proposing fixes, prefer earlier moves over later ones: 1. **Delete the animation** (high-frequency / no purpose / keyboard-triggered). 2. **Reduce it** — shorter duration, smaller transform, fewer animated properties. 3. **Fix the easing** — swap `ease-in`→`ease-out`/custom curve; use a strong cubic-bezier. 4. **Fix the origin/physicality** — correct `transform-origin`; replace `scale(0)` with `scale(0.95)`+opacity. 5. **Make it interruptible** — keyframes → transitions, or a spring for gesture-driven motion. 6. **Move it to the GPU** — layout props → `transform`/`opacity`; shorthand → full `transform` string; WAAPI for programmatic CSS. 7. **Asymmetric timing** — slow the deliberate phase, snap the response. 8. **Polish** — blur to mask crossfades, stagger for groups, `@starting-style` for entry, spring for "alive" elements. 9. **Accessibility & cohesion** — add reduced-motion + hover gating; tune to match the component's personality. ## Required Output Format Two parts, in this order. ### Part 1 — Findings table (REQUIRED) A single markdown table. One row per issue. Never a "Before:/After:" list. | Before | After | Why | | --- | --- | --- | | `transition: all 300ms` | `transition: transform 200
Review the source
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- License
- MIT
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Free to get does not mean free to run. Price labels are not safety ratings. Submit pricing information →
Source structure unverified
A repository listing is not proof of an installable skill. Review its instructions before proposing any installation.
Review before install: Avoid automatic install
License: MIT
- Potential broker, wallet, exchange, or real-money execution surface; sandbox and explicit approval are required
- This skill may touch real-money trading, broker, wallet, or exchange operations; use only in a sandbox with explicit approval.
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Start with one small task
- 1Read the source. Confirm the input, expected output, dependencies and permissions.
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Check the source for dependencies, API keys and third-party costs. A public repository does not mean every service is free.
Source & usage notes
Repository metadata and review signals are advisory. Popularity, source discovery and successful execution are different facts.
- Source repository
- emilkowalski/skills
- License
- MIT
- Version
- 1.0.0
- Last GitHub push
- Jul 15, 2026
- Registry updated
- Sep 1, 2026
- Instruction path
- Source structure unverified
Version reported in registry metadata; check source releases before relying on it.
Quality
100/100
Excellent
Trust
86/100
Review then install
Audit
93/100
Risky
- Potential broker, wallet, exchange, or real-money execution surface; sandbox and explicit approval are required
- This skill may touch real-money trading, broker, wallet, or exchange operations; use only in a sandbox with explicit approval.
- Verified installs
- —
- Outcomes
- —
Copies are not installs. Installation counts require a reported successful installation; they are not a blanket quality guarantee.
Agent access
This page exposes the same decision, trust, audit, use-case, and install signals through the Registry API, so agents can rank this skill without scraping the UI.
More details
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}For the creator
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- Creator
- Emil Kowalski
- Source
- emilkowalski/skills
- Indexed by
- OpenAgentSkill community index
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