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 motion-sicknessgit 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/motion-sickness)<a href="https://agentmods.dev/skills/dylantarre/animation-principles/motion-sickness"><img src="https://agentmods.dev/badge/skills/dylantarre/animation-principles/motion-sickness/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/motion-sickness"><img src="https://agentmods.dev/badge/skills/dylantarre/animation-principles/motion-sickness.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 | $0.00019 | $0.00671 |
| Opus 5 | $0.00010 | $0.00336 |
| Sonnet 5 | $0.00004 | $0.00134 |
| Haiku 4.5 | $0.00002 | $0.00067 |
Grade A, and why
motion-sickness 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 9d 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 — 102 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Motion Sickness Prevention
Eliminate vestibular triggers using Disney's principles safely.
Problem Indicators
- Users report dizziness or nausea
- Disorientation during navigation
- Users avoid certain features
- Complaints increase with larger screens
- Parallax or zoom effects cause issues
Dangerous Patterns
These trigger vestibular responses:
- Large-scale zoom animations
- Parallax scrolling (especially multi-layer)
- Full-screen rotations
- Rapid direction changes
- Continuous/looping background motion
- Scroll-jacking
Diagnosis by Principle
Exaggeration
Issue: Over-dramatic motion Fix: Reduce scale of transforms. Max 10-20% size change. Avoid full-screen zooms.
Arcs
Issue: Curved paths cause tracking strain Fix: Use linear motion for functional UI. Save arcs for small, optional elements only.
Follow Through
Issue: Overshooting creates whiplash effect Fix: Remove bounce/overshoot from navigation. Use critically damped springs or ease-out.
Secondary Action
Issue: Multiple moving elements cause confusion Fix: Limit to one primary motion. Remove parallax layers.
Slow In and Slow Out
Issue: Acceleration patterns cause disorientation Fix: Use consistent, predictable easing. Avoid sudden speed changes.
Quick Fixes
- Respect
prefers-reduced-motion- Non-negotiable - Remove parallax effects - Common trigger
- Avoid zoom transitions - Use fades instead
- Keep motion small - Under 100px movement
- No scroll-jacking - Let scroll be scroll
Troubleshooting Checklist
- Does animation respect
prefers-reduced-motion? - Is any element moving more than 100px?
- Are there any zoom effects?
- Is parallax present? Remove it.
- Are there continuous/looping animations?
- Can users pause or disable motion?
- Test on large display (motion amplified)
- Test for 5+ minutes continuously
Safe Alternatives
| Triggering | Safe Alternative |
|---|---|
| Zoom transition | Fade + slight scale (max 5%) |
| Parallax scroll | Static or single-layer |
| Rotation | Fade or slide |
| Bounce/spring | Ease-out (no overshoot) |
| Full-page slide | Crossfade |
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.
- 9d ago First seen · 102 lines · 19 tokens per session scan A 99f8788e4882
motion-sickness is a skill published in the GitHub repository dylantarre/animation-principles (81 stars, last pushed 8mo ago), licensed MIT. It adds 19 tokens to every session and 671 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 2026-09-03.
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