gsap-skills is a collection of official AI-agent skills that explain how to use GSAP, a JavaScript animation platform for creating timelines, tweens, and effects such as scroll-driven and path-based motion. It helps coding agents build GSAP animations in vanilla JavaScript and frameworks including React, Vue, and Svelte while following recommended API and performance practices. The catalogue contains the project's skills, instructions, and plugin.
Borrowing it
Nothing to install: this file belongs to greensock/gsap-skills. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/greensock/gsap-skills/main/.github/instructions/scrolltrigger.instructions.mdgit clone --depth 1 https://github.com/greensock/gsap-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/instructions/greensock/gsap-skills/scrolltrigger)<a href="https://agentmods.dev/instructions/greensock/gsap-skills/scrolltrigger"><img src="https://agentmods.dev/badge/instructions/greensock/gsap-skills/scrolltrigger/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/instructions/greensock/gsap-skills/scrolltrigger"><img src="https://agentmods.dev/badge/instructions/greensock/gsap-skills/scrolltrigger.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 | $0.00412 | $0.00412 |
| Opus 5.5 | $0.00165 | $0.00165 |
| Sonnet 5.5 | $0.00082 | $0.00082 |
| Haiku 4.5 | $0.00041 | $0.00041 |
Grade A, and why
gsap-skills scrolltrigger.instructions.md 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 1mo 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.
What it actually says
ScrollTrigger — path-specific instructions
When writing or suggesting scroll-linked GSAP code (ScrollTrigger):
- Register the plugin once:
gsap.registerPlugin(ScrollTrigger). - Use scrub: true (or a number) for scroll-driven progress; use toggleActions for discrete play/reverse. Do not use both on the same trigger.
- Put ScrollTrigger on the timeline or a top-level tween, not on a tween that is a child of a timeline (wrong:
tl.to(..., { scrollTrigger: {... } }); right:gsap.timeline({ scrollTrigger: {... } }).to(...)). - When pinning, do not animate the pinned element itself; animate its children. Use pinSpacing: true (default) so layout does not collapse.
- Prefer transform properties (
x,y,scale,rotation) for the animated element; avoid animating layout properties when possible. - For “fake” horizontal scroll (pin a section, content moves horizontally while scrolling vertically), use containerAnimation and set ease: "none" on the horizontal tween so scroll and position stay in sync.
- start / end format:
"triggerPosition viewportPosition"(e.g."top center","bottom top"). UseendTriggerif the end is based on a different element. - Call ScrollTrigger.refresh() after DOM or layout changes that affect trigger positions (e.g. new content, fonts loaded). Viewport resize is handled automatically.
- Create ScrollTriggers in top-to-bottom page order, or set refreshPriority so they refresh in that order when creation order differs.
- When removing elements or changing routes (SPAs), kill ScrollTrigger instances:
ScrollTrigger.getAll().forEach(t => t.kill())or kill by id.
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.
- 1mo ago First seen · 19 lines · 412 tokens per session scan A 40763240d0ce
gsap-skills scrolltrigger.instructions.md is an instructions file published in the GitHub repository greensock/gsap-skills (17,326 stars, last pushed 3mo ago), licensed MIT. It adds 412 tokens to every session, about $0.0016 per session on Opus 5.5. 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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