spring-animation

spring-animation is a skill for Claude Code, Codex from notedit/happy-skills. It costs 38 tokens per session (8,575 once invoked), scanned A, original, MIT.

A set of Remotion techniques for adding physics-based movement to videos, such as bounce, overshoot, elastic settling, and natural trails.

In plain words
What is it for?
Use it for bouncy entrances, elastic trails, counters that overshoot, natural scale or rotation, and coordinated spring animations.
Why use it?
It helps animations feel physically weighted when ordinary timed movement would look too rigid.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one.

Good fit Use it for bouncy entrances, elastic trails, counters that overshoot, natural scale or rotation, and coordinated spring animations.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/notedit/happy-skills/spring-animation
Install

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.

Any agent
npx skills add notedit/happy-skills --skill spring-animation
Clone the repo
git clone --depth 1 https://github.com/notedit/happy-skills

Made for: Claude Code, Codex.

Wrote 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.

agentmods badge for spring-animation

README.md
[![agentmods](https://agentmods.dev/badge/skills/notedit/happy-skills/spring-animation.svg)](https://agentmods.dev/skills/notedit/happy-skills/spring-animation)
Your own site
<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>
Per session 38 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 8,575 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin original No closer match found in the catalogue.
Token cost

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.

ModelPer sessionOnce 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

Measured 7d ago against content hash d421ce468ed9, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-07, from the pricing page.

Security

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.

skills/video/spring-animation/SKILL.md · 1,070 lines

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)

Read the full file on GitHub · 1,070 lines

Files

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.

Changes

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.

  1. 7d ago First seen · 1,070 lines · 38 tokens per session scan A d421ce468ed9

Subscribe to this mod's changes

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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