Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx skills add dylantarre/animation-principles --skill web-motion-designgit clone --depth 1 https://github.com/dylantarre/animation-principlesWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/dylantarre/animation-principles/web-motion-design)<a href="https://agentmods.dev/skills/dylantarre/animation-principles/web-motion-design"><img src="https://agentmods.dev/badge/skills/dylantarre/animation-principles/web-motion-design/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/dylantarre/animation-principles/web-motion-design"><img src="https://agentmods.dev/badge/skills/dylantarre/animation-principles/web-motion-design.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- Socket pass
- Snyk pass
What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00026 | $0.00910 |
| Opus 5 | $0.00013 | $0.00455 |
| Sonnet 5 | $0.00005 | $0.00182 |
| Haiku 4.5 | $0.00003 | $0.00091 |
Grade A, and why
web-motion-design scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 10d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 79 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Web Motion Design
Apply Disney's 12 animation principles to CSS, JavaScript, and frontend frameworks.
Quick Reference
| Principle | Web Implementation |
|---|---|
| Squash & Stretch | transform: scale() on interaction states |
| Anticipation | Slight reverse movement before action |
| Staging | Focus user attention with motion hierarchy |
| Straight Ahead / Pose to Pose | JS frame-by-frame vs CSS keyframes |
| Follow Through / Overlapping | Staggered child animations, elastic easing |
| Slow In / Slow Out | ease-in-out, cubic-bezier curves |
| Arc | motion-path or bezier translate transforms |
| Secondary Action | Shadows, glows responding to primary motion |
| Timing | Duration: micro 100-200ms, standard 200-400ms |
| Exaggeration | Scale beyond 1.0, overshoot animations |
| Solid Drawing | Consistent transform-origin, 3D perspective |
| Appeal | Smooth 60fps, purposeful motion design |
Principle Applications
Squash & Stretch: Apply scaleY compression on button press, scaleX stretch on hover. Keep volume constant—if you compress Y, expand X slightly.
Anticipation: Before expanding a dropdown, shrink it 2-3% first. Before sliding content left, move it 5px right.
Staging: Dim background elements during modal focus. Use motion to direct eye flow—animate important elements first.
Straight Ahead vs Pose to Pose: Use CSS @keyframes for predictable, repeatable animations (pose to pose). Use JavaScript/GSAP for dynamic, physics-based motion (straight ahead).
Follow Through & Overlapping: Child elements should complete movement after parent stops. Use animation-delay with decreasing values for natural stagger.
Slow In / Slow Out: Never use linear for UI motion. Standard easing: cubic-bezier(0.4, 0, 0.2, 1). Enter: cubic-bezier(0, 0, 0.2, 1). Exit: cubic-bezier(0.4, 0, 1, 1).
Arc: Elements in nature move in arcs, not straight lines. Use offset-path or combine X/Y transforms with different easings.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 10d ago First seen · 79 lines · 26 tokens per session scan A 5fd447db3456
web-motion-design is a skill published in the GitHub repository dylantarre/animation-principles (80 stars, last pushed 8mo ago), licensed MIT. It adds 26 tokens to every session and 910 once invoked, about $0.0001 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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