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 notedit/happy-skills --skill spring-animationgit clone --depth 1 https://github.com/notedit/happy-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/notedit/happy-skills/spring-animation)<a href="https://agentmods.dev/skills/notedit/happy-skills/spring-animation"><img src="https://agentmods.dev/badge/skills/notedit/happy-skills/spring-animation.svg" alt="Measured on agentmods" 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 | $0.00038 | $0.08575 |
| Opus 5 | $0.00019 | $0.04287 |
| Sonnet 5 | $0.00008 | $0.01715 |
| Haiku 4.5 | $0.00004 | $0.00857 |
Grade A, and why
spring-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 7d 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 — 1,070 lines — stays where its author put it; the contents beside it link to each section on GitHub.
When to use
Use this skill when creating Remotion video compositions that need spring physics -- natural, organic motion with bounce, overshoot, and elastic settling.
Use spring when you need:
- Bouncy/elastic entrances (overshoot + settle)
- Organic deceleration (not linear, not eased -- physically modeled)
- Staggered trails with spring physics per element
- Number counters that overshoot then settle
- Scale/rotate with natural weight and inertia
- Enter + exit animations with spring math (
in - out) - Multi-property orchestration with different spring configs per property
Use Remotion native interpolate() when:
- Linear or eased motion with no bounce (fade, slide, wipe)
- Exact timing control (must end at precisely frame N)
- Clip-path animations
- Progress bars / deterministic counters
Use GSAP (gsap-animation skill) when:
- Text splitting (SplitText: chars/words/lines with mask)
- SVG stroke drawing (DrawSVG)
- SVG morphing (MorphSVG)
- Complex timeline orchestration with labels and position parameters
- ScrambleText decode effects
- Registered reusable effects
Note: @react-spring/web is NOT compatible with Remotion (it uses requestAnimationFrame internally). This skill uses Remotion's native spring() function which provides the same physics model in a frame-deterministic way.
Core API
spring()
Returns a value from 0 to 1 (can overshoot past 1 with low damping) based on spring physics simulation.
import { spring, useCurrentFrame, useVideoConfig } from 'remotion';
const frame = useCurrentFrame();
const { fps } = useVideoConfig();
const value = spring({
frame,
fps,
config: {
damping: 10, // 1-200: higher = less bounce
stiffness: 100, // 1-200: higher = faster snap
mass: 1, // 0.1-5: higher = more inertia
},
});
Config Parameters
| Parameter | Range | Default | Effect |
|---|---|---|---|
damping |
1-200 | 10 | Resistance. Low = bouncy, high = smooth |
stiffness |
1-200 | 100 | Snap speed. High = fast, low = slow |
mass |
0.1-5 | 1 | Weight/inertia. High = sluggish, low = light |
overshootClamping |
bool | false | Clamp at target (no overshoot) |
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.
- 7d ago First seen · 1,070 lines · 38 tokens per session scan A d421ce468ed9
spring-animation is a skill published in the GitHub repository notedit/happy-skills (340 stars, last pushed 6mo ago), licensed MIT. It adds 38 tokens to every session and 8,575 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 2026-08-31.
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