Version-sensitive. Every API name, SDK gate and browser-support claim below was verified on 2026-09-08 against primary sources. What against, and when, is in _jutsu/VERSIONS.md. If that date is old, re-verify before acting on a version number.

GSAP - Animation Engine

GSAP 3.15 (released 13 Apr 2026). Since 3.13 the entire library - including every former Club plugin (SplitText, MorphSVG, DrawSVG, ScrollSmoother, InertiaPlugin, MotionPathHelper, CustomEase…) - ships in the public gsap npm package and is free, commercial use included, under the GreenSock Standard "no charge" license. There is no Club paywall. GreenSock also publish official agent skills (MIT, 8 skills: core, timeline, scrolltrigger, plugins, utils, react, performance, frameworks): https://github.com/greensock/gsap-skills - worth installing alongside this sub-skill.

When to use GSAP

Criteria	CSS Transitions	Framer Motion	GSAP
Hover / simple toggle	Yes	Yes	Overkill
Sequenced timeline	No	Limited	Yes
Scroll-driven	scroll-timeline	Limited	ScrollTrigger
Complex stagger	No	Basic	Distribution
Mobile perf (60fps)	Good	Average	Excellent
Text splitting	No	No	SplitText
SVG morph / draw	No	No	MorphSVG
Bundle size concern	0kb	~30kb	~25kb + plugins

Rule: if the animation needs timeline, scroll-link, or distributed stagger, use GSAP. Otherwise CSS first.

Setup

// Always register plugins at the top level
import gsap from "gsap";
import { ScrollTrigger } from "gsap/ScrollTrigger";
import { SplitText } from "gsap/SplitText";