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 medium-300-500msgit 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/medium-300-500ms)<a href="https://agentmods.dev/skills/dylantarre/animation-principles/medium-300-500ms"><img src="https://agentmods.dev/badge/skills/dylantarre/animation-principles/medium-300-500ms/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/medium-300-500ms"><img src="https://agentmods.dev/badge/skills/dylantarre/animation-principles/medium-300-500ms.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 | $0.00032 | $0.00714 |
| Opus 5 | $0.00016 | $0.00357 |
| Sonnet 5 | $0.00006 | $0.00143 |
| Haiku 4.5 | $0.00003 | $0.00071 |
Grade A, and why
medium-300-500ms 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 — 92 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Medium Animations (300-500ms)
The 300-500ms range is standard animation territory. Long enough to be watched, short enough to not impede flow. The workhorse duration for meaningful motion.
Disney Principles at Medium Duration
All 12 Principles Applicable
Squash & Stretch: Full expression - visible deformation for bouncing, elastic elements. 15-25% stretch feels natural.
Anticipation: Clear preparation - 80-120ms anticipation before main action. Pull back before push forward.
Staging: Multi-element choreography possible - primary action leads, supporting elements follow.
Straight Ahead/Pose to Pose: Pose to pose recommended - define key positions, let easing handle in-betweens.
Follow Through: Essential - overlapping action where parts settle at different rates.
Slow In/Slow Out: Critical for naturalism - both directions need proper easing.
Arcs: Natural motion paths - elements should travel on curves matching real physics.
Secondary Action: Multiple secondary actions - hair follows head, shadow follows object.
Timing: 18-30 frames at 60fps. Enough frames for nuanced motion.
Exaggeration: Full range available - match to brand personality and context.
Solid Drawing: Complex transforms work - 3D rotations, perspective shifts.
Appeal: Character-defining animations - this is where brand personality lives.
Easing Recommendations
/* Smooth, natural motion */
transition: all 400ms cubic-bezier(0.4, 0, 0.2, 1);
/* Expressive entrance */
transition: all 450ms cubic-bezier(0.16, 1, 0.3, 1);
/* Bouncy, playful */
transition: transform 400ms cubic-bezier(0.34, 1.56, 0.64, 1);
/* Dramatic deceleration */
transition: all 350ms cubic-bezier(0, 0.55, 0.45, 1);
Best Use Cases
- Page/view transitions
- Complex modal sequences
- Animated illustrations
- Data visualization changes
- Onboarding animations
- Feature reveals
- State machine transitions
- Loading completion celebrations
Implementation Pattern
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 · 92 lines · 32 tokens per session scan A d275b1fdb451
medium-300-500ms is a skill published in the GitHub repository dylantarre/animation-principles (81 stars, last pushed 8mo ago), licensed MIT. It adds 32 tokens to every session and 714 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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