Guide · Agent skill
How to use the GSAP Utils Helper agent skill
Updated · written with AI from the project's own documentation and checked against our catalogue data
The gsap-utils skill is an MIT-licensed skill for AI coding agents that gives the agent reference knowledge of GSAP's gsap.utils helper functions, such as clamp, mapRange, normalize, interpolate, random and snap. It is for front-end developers, designers and creative coders who use the GSAP animation library and want generated code to call these helpers correctly. After this guide you will know what the skill does, how to install it, how to phrase requests so it triggers, and what it needs to run.
GSAP Utils Helpergreensock/gsap-skills · MIT Download the skill Quick start
- 1Get the ZIP. Download the gsap-utils ZIP from the directory page.
- 2Unzip into a skills folder. Unzip it into ~/.claude/skills/ for all projects, or into a project's .claude/skills/ folder for one project.
- 3Or upload in the Claude apps. In the Claude apps, open Settings, go to Capabilities, and upload the skill under Skills.
- 4Install GSAP in your project. Make sure the project where the code will run includes the GSAP library, since gsap.utils ships with it.
- 5Ask a specific question. Describe the effect and name the helper, such as clamp, mapRange, snap or random.
- 6Review the output. Run the generated code in your project and check the values against the examples in the skill.
What an agent skill is and what gsap-utils makes the agent do
An agent skill is a folder of instructions that an AI agent can load when a task matches it. The gsap-utils skill is a single SKILL.md file of documentation and examples for the gsap.utils helper functions from the GSAP JavaScript library.
With the skill installed, when you ask for animation code the agent knows how to use helpers such as clamp (keep a value within limits), mapRange (convert one number range to another, for example scroll position to rotation), snap (round to a grid) and random (pick random values). It also knows the function form of these helpers, which returns a reusable function instead of a single result.
- The skill contains documentation and examples only. It does not run any code and does not contact the internet.
- It covers gsap.utils only. For plugins such as ScrollTrigger or CustomEase, the skill points to other skills.
Install the gsap-utils skill from a ZIP or the Claude apps
Option 1: download the ZIP for gsap-utils from the directory page and unzip it into your personal skills folder, ~/.claude/skills/, so it is available in every project.
Option 2: unzip it into a project's .claude/skills/ folder so it applies only to that project and can be shared with the team through the repository.
Option 3: in the Claude apps, open Settings, go to Capabilities, and upload the skill under Skills.
- Check that the skill folder contains SKILL.md after unzipping.
- Restart or start a new session if the agent does not pick up the skill straight away.
Trigger the skill with natural requests
The skill's description says it applies when the user asks about gsap.utils, clamp, mapRange, random, snap, toArray, wrap, or helper utilities in GSAP. You do not need to name the skill. Mention GSAP and the helper you want, and describe the effect.
Good requests name the helper and the goal, such as mapping scroll progress to an angle or snapping a drag to a 20-pixel grid. Vague requests like 'make it animate nicely' may not bring the helper functions into the answer.
- Write a GSAP mousemove handler that clamps the x position of a box between -100 and 100.
- Use gsap.utils.mapRange to turn scroll progress from 0 to 1 into rotation from 0 to 360 degrees.
- Give each .box a random x value snapped to multiples of 5 with GSAP random().
- Review this GSAP code and check that the gsap.utils functions are used correctly.
Examples of the helpers in code
Each helper returns a result when you pass a value. If you omit the value, it returns a function you call later. Use the function form when you apply the same settings to many values, such as in a mousemove handler or tween callback.
random() is the exception: pass true as the last argument to get a reusable function.
gsap.utils.clamp(0, 100, 150); // 100
let c = gsap.utils.clamp(0, 100);
c(150); // 100
gsap.utils.mapRange(0, 100, 0, 500, 50); // 250
gsap.utils.snap(10, 23); // 20
gsap.to(".box", { x: "random(-100, 100, 5)", duration: 1 });Requirements and safety notes
The skill needs the GSAP library in the project where the generated code will run, because gsap.utils is part of the GSAP JavaScript package. The skill itself does not install GSAP.
According to the listing, the skill runs no scripts and uses no network access. It ships one file, SKILL.md. Because it is documentation, it cannot test the code the agent writes, so run and review generated animations in your own project.
- Runs scripts: no
- Uses network: no
- Licence: MIT
- Files: SKILL.md
Tips for getting reliable results
Tell the agent which GSAP version and setup your project uses, and paste the existing code if you are editing it. Ask for the function form when a helper will be reused many times, and ask for random() with true when you need a repeatable random generator.
For scroll-driven work, the skill recommends pairing gsap.utils with gsap-core, gsap-timeline and gsap-scrolltrigger. Ask for those skills' topics explicitly if the animation depends on ScrollTrigger.
- Name the helper in your request, for example clamp or mapRange.
- Give the input and output ranges with numbers.
- Check the result against the examples in the skill before using it in production.
What people use it for
- Keeping a draggable or mouse-driven element within set limits with clamp.
- Converting scroll progress from 0 to 1 into rotation or movement with mapRange.
- Snapping drag or step animations to a grid with snap.
- Randomising positions, colours or delays for a set of elements with random.
Frequently asked questions
How do I install the gsap-utils skill?
Download the ZIP from the directory page and unzip it into ~/.claude/skills/ for all projects, or into a project's .claude/skills/ folder. You can also upload it in the Claude apps under Settings, Capabilities, Skills.
Do I need GSAP installed to use this skill?
Yes. The skill documents gsap.utils, which is part of the GSAP JavaScript library, so the project where the generated code runs needs GSAP. The skill does not install it.
Is the gsap-utils skill free to use?
The skill is listed under the MIT licence. Check the licence file in the source repository for the full terms before you reuse or redistribute it.
Does the skill run code or access the internet?
According to the listing, it runs no scripts and uses no network. It contains only SKILL.md with documentation and examples.
What is the difference between clamp and mapRange?
clamp keeps a value between a minimum and maximum. mapRange converts a value from one range to another, such as turning scroll progress from 0 to 1 into degrees from 0 to 360.
Does this skill cover ScrollTrigger or other GSAP plugins?
No. It covers gsap.utils only. For ScrollTrigger or CustomEase, the skill refers you to other skills, so those topics may be only partly covered.
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Our verdict
Use this skill if you write or review GSAP code and want an AI agent to use gsap.utils helpers like clamp, mapRange, snap and random accurately. Pick something else if you do not use GSAP, or if your main need is plugin work such as ScrollTrigger, where this skill gives only partial coverage.
Download the skill