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 small-200-300msgit 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/small-200-300ms)<a href="https://agentmods.dev/skills/dylantarre/animation-principles/small-200-300ms"><img src="https://agentmods.dev/badge/skills/dylantarre/animation-principles/small-200-300ms/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/small-200-300ms"><img src="https://agentmods.dev/badge/skills/dylantarre/animation-principles/small-200-300ms.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 | $0.00031 | $0.00667 |
| Opus 5 | $0.00015 | $0.00333 |
| Sonnet 5 | $0.00006 | $0.00133 |
| Haiku 4.5 | $0.00003 | $0.00067 |
Grade A, and why
small-200-300ms 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 — 94 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Small Transitions (200-300ms)
At 200-300ms, users consciously perceive motion. This duration bridges micro-interactions and full animations - ideal for UI state changes.
Disney Principles at Small Duration
Works Well
Squash & Stretch: Visible but restrained - 10-15% for playful interfaces, 5% for professional.
Anticipation: Brief wind-up works - 40-60ms preparation enhances 200ms main action.
Staging: Clear hierarchy - primary element leads, secondary follows by 50-100ms.
Straight Ahead/Pose to Pose: Pose to pose preferred - keyframes create polished motion.
Follow Through: Noticeable overshoot - 5-10% past target adds life.
Slow In/Slow Out: Full easing curves - both ease-in-out and custom beziers shine.
Arcs: Natural curves enhance - elements can travel on arcs rather than straight lines.
Secondary Action: One or two secondary actions - fade + scale, move + rotate.
Timing: 12-18 frames at 60fps. Smooth, deliberate motion.
Exaggeration: Moderate to pronounced - depends on brand personality.
Solid Drawing: Full transform combinations - translate, scale, rotate together.
Appeal: Conscious animation that builds brand character.
Doesn't Work
- Feeling instant (too slow)
- Complex character animation
- Long travel distances
- Multiple sequential stages
Easing Recommendations
/* Standard smooth transition */
transition: all 250ms ease-out;
/* Modal/card appearance - confident arrival */
transition: all 250ms cubic-bezier(0.16, 1, 0.3, 1);
/* Bouncy personality */
transition: transform 280ms cubic-bezier(0.34, 1.56, 0.64, 1);
/* Professional, subtle */
transition: all 220ms cubic-bezier(0.4, 0, 0.2, 1);
Best Use Cases
- Modal dialogs appearing
- Card expand/collapse
- Navigation drawer slides
- Tab content transitions
- Filter panel toggles
- Image thumbnails expanding
- Alert/notification slides
Implementation Pattern
.modal {
opacity: 0;
transform: translateY(20px) scale(0.95);
transition: opacity 200ms ease-out,
transform 250ms cubic-bezier(0.16, 1, 0.3, 1);
}
.modal.open {
opacity: 1;
transform: translateY(0) scale(1);
}
.card-expand {
transition: all 280ms cubic-bezier(0.34, 1.56, 0.64, 1);
}
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 · 94 lines · 31 tokens per session scan A 1b30e1d808b4
small-200-300ms is a skill published in the GitHub repository dylantarre/animation-principles (81 stars, last pushed 8mo ago), licensed MIT. It adds 31 tokens to every session and 667 once invoked, about $0.0002 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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