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 iart-ai/motion-design-skills --skill animation-principlesgit clone --depth 1 https://github.com/iart-ai/motion-design-skillsWrote 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/iart-ai/motion-design-skills/animation-principles)<a href="https://agentmods.dev/skills/iart-ai/motion-design-skills/animation-principles"><img src="https://agentmods.dev/badge/skills/iart-ai/motion-design-skills/animation-principles/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/iart-ai/motion-design-skills/animation-principles"><img src="https://agentmods.dev/badge/skills/iart-ai/motion-design-skills/animation-principles.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 | $0.00119 | $0.02110 |
| Opus 5 | $0.00060 | $0.01055 |
| Sonnet 5 | $0.00024 | $0.00422 |
| Haiku 4.5 | $0.00012 | $0.00211 |
Grade A, and why
animation-principles 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 11d 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.
Copies of this mod
1 near-identical copy found in the catalogue:
- animation-principles — 100% identical, 0 lines differ
How it starts
The opening of the file, as written. The whole thing — 115 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Motion Principles
Decide how something should move so it feels right — independent of the tool used to build it. This skill answers timing, easing, spacing, weight, and rhythm. It does not pick a tech stack; it produces concrete numbers (durations, cubic-bezier curves, stagger offsets, spring configs) ready to hand to any implementation.
When to use
- Motion feels stiff, floaty, mechanical, robotic, or cheap and needs diagnosis.
- Choosing a clip or transition's duration, easing curve, and stagger offset.
- Reviewing whether motion respects physics intuition (weight, follow-through, arcs).
- Synchronizing keyframes to a musical beat or edit accent.
Three pillars — settle these before any number
Every piece of motion should answer three questions before you pick a duration or curve. Skip them and you get technically-correct motion that feels like nothing. These are the shared vocabulary the rest of the collection refers back to.
| Pillar | The question | What it drives |
|---|---|---|
| Emotional intent | What should the viewer feel? (joy, calm, urgency, trust, elegance) | Easing, duration, amplitude/overshoot |
| Visual narrative | What's the micro-story? Setup → action → resolution | Sequencing, staging, what enters when |
| Motion craft | How do we make it believable? | Physics, secondary motion, arcs, follow-through |
Three motion layers — depth, not flatness
Flat motion = only the main thing moves. Believable motion runs three layers at once:
- Primary — the main action the eye follows (the hero move).
- Secondary — supporting richness reacting to the primary (a shadow shifting, an icon nudging, a label settling late).
- Ambient — background life that never demands attention (slow gradient drift, a low-contrast pulse).
The judgment layer (
motion-art-direction) calls these Hero / Support / Texture — same three layers, ranked for what earns motion. Primary≈Hero, Secondary≈Support, Ambient≈Texture.
Core principles
What ships with it
4 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
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.
- 11d ago First seen · 115 lines · 119 tokens per session scan A 21637766f8ae
animation-principles is a skill published in the GitHub repository iart-ai/motion-design-skills (28 stars, last pushed 2mo ago), licensed MIT. It adds 119 tokens to every session and 2,110 once invoked, about $0.0006 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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