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 marchatton/agent-skills --skill 12-principles-of-animationgit clone --depth 1 https://github.com/marchatton/agent-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/marchatton/agent-skills/12-principles-of-animation)<a href="https://agentmods.dev/skills/marchatton/agent-skills/12-principles-of-animation"><img src="https://agentmods.dev/badge/skills/marchatton/agent-skills/12-principles-of-animation/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/marchatton/agent-skills/12-principles-of-animation"><img src="https://agentmods.dev/badge/skills/marchatton/agent-skills/12-principles-of-animation.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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 | $0.00060 | $0.01038 |
| Opus 5 | $0.00030 | $0.00519 |
| Sonnet 5 | $0.00012 | $0.00208 |
| Haiku 4.5 | $0.00006 | $0.00104 |
Grade A, and why
12-principles-of-animation 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 12d 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 — 95 lines — stays where its author put it; the contents beside it link to each section on GitHub.
12 Principles of Animation
Source: ui-skills.com.
Disney animators codified these principles in the 1930s to make drawings feel real. We use them to make pixels feel human. The problems are surprisingly similar.
When to Apply
Reference these guidelines when:
- Adding motion to UI components
- Reviewing animation quality and feel
- Designing micro-interactions and feedback
- Making interfaces feel more alive and responsive
- Deciding what should (and shouldn't) animate
Principles Overview
| # | Principle | Web Application |
|---|---|---|
| 1 | Squash and Stretch | Convey weight and elasticity in morphing elements |
| 2 | Anticipation | Prepare users for what comes next (wind-up before action) |
| 3 | Staging | Direct attention through sequential animation |
| 4 | Straight Ahead & Pose to Pose | Define keyframes, let browser interpolate |
| 5 | Follow Through & Overlapping | Use springs for organic overshoot-and-settle |
| 6 | Slow In & Slow Out | Apply easing curves for natural acceleration |
| 7 | Arcs | Add curved paths for organic movement |
| 8 | Secondary Action | Reinforce primary actions with subtle flourishes |
| 9 | Timing | Keep interactions under 300ms, be consistent |
| 10 | Exaggeration | Amplify motion for emphasis (sparingly) |
| 11 | Solid Drawing | Use perspective, shadows, and depth |
| 12 | Appeal | The sum of all techniques applied with care |
Quick Reference
1. Squash and Stretch
Digital objects don't have physics, so we fake it. Subtle deformation conveys weight—but don't overdo it or professional software becomes a cartoon.
2. Anticipation
Give cues before major actions. Pull-to-refresh hints, buttons that compress before sending. Reserve for moments that matter—too many wind-ups make apps feel sluggish.
3. Staging
Guide the eye through sequential animation. Dim backgrounds, focus on important elements. Direct attention like a film.
4. Straight Ahead & Pose to Pose
Focus on key poses: start state, end state, maybe a midpoint. Context menus animate on exit only—entrance animation compounds into irritation.
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.
- 12d ago First seen · 95 lines · 60 tokens per session scan A 1b1a15563c60
12-principles-of-animation is a skill published in the GitHub repository marchatton/agent-skills (5 stars, last pushed 6mo ago), licensed MIT. It adds 60 tokens to every session and 1,038 once invoked, about $0.0003 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 2026-08-31.
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