Guide · Agent skill
How to use the Vanta.js Animated Backgrounds agent skill
Updated · written with AI from the project's own documentation and checked against our catalogue data
The vantajs skill teaches an AI agent how to add decorative, animated WebGL backgrounds to a web page using the Vanta.js library, such as waves, birds, fog or net effects behind a hero section. It is aimed at front-end developers, designers and small teams who want a quick visual effect without writing a three.js scene from scratch. By the end of this guide you will know what the skill does, how to install it, how to ask for it in plain language, and what to check before using it on a real site.
Vanta.js Animated BackgroundsMengTo/Skills · MIT Download the skill Quick start
- 1Download and unzip the skill. Download the ZIP from the skill's page and unzip it into ~/.claude/skills/ for personal use or into your project's .claude/skills/ folder.
- 2Or upload it in the Claude apps. In the Claude apps, open Settings → Capabilities → Skills and upload the skill.
- 3Prepare a container. Give the element that will hold the effect an explicit width and height, such as a hero section with a set height.
- 4Ask for the effect. Describe the effect you want, the page or framework, and your colours, or name the skill with $vantajs.
- 5Review the code. Check that three.js and the Vanta effect bundle load correctly and that the effect is created on the right element.
- 6Test resizing and cleanup. Resize the window and, in React or Next.js, confirm that the effect is destroyed when the component unmounts.
- 7Check performance. Test on a phone or older device, and make sure text stays readable and a fallback background appears if needed.
What does the vantajs skill make the agent do?
An agent skill is a folder of instructions that an AI agent loads when your request matches the skill's description. This skill's description is: use when adding animated WebGL background effects with Vanta.js, covering setup, parameters, resizing, performance, and integration in React or Next.js.
Once loaded, the agent knows the Vanta.js patterns in the skill. Vanta injects a canvas into a container element and renders an effect, and many effects use three.js. The skill covers creating an effect, changing its options after it loads, resizing it, and destroying it when the page no longer needs it.
- Create an effect on a container element, for example a hero section
- Update colours and options after initialisation with setOptions
- Call resize when the container size changes
- Clean up with destroy, which matters in single-page apps
- Warn about common problems such as containers with no size, too many WebGL canvases and mobile GPU load
const effect = VANTA.WAVES({ el: "#hero", ...options }); effect.setOptions({ color: 0xff88cc }); effect.resize(); effect.destroy();How do you install the vantajs skill?
You can install the skill in one of three ways. Download the ZIP file from the skill's page on the directory, then choose the option that fits your setup.
For a personal setup, unzip the folder into ~/.claude/skills/. To make it available only inside one project, unzip it into that project's .claude/skills/ folder. If you use the Claude apps, you can instead upload the skill under Settings → Capabilities → Skills.
- Personal: unzip into ~/.claude/skills/
- Single project: unzip into the project's .claude/skills/ folder
- Claude apps: Settings → Capabilities → Skills, then upload the skill
What files come with the skill?
The skill folder contains a main instruction file and a demo. SKILL.md holds the instructions the agent reads. REFERENCES.md lists the official Vanta resources, including the GitHub repository for usage, options and cleanup, and the demo gallery and customizer on the Vanta website.
The demo folder contains demo/index.html, which is a standalone example, and demo/PROMPT.md, which holds prompts for recreating the demo. The demo's prompts describe a full-bleed animated background with slow wave bands and a narrow moving signal beam, placed behind compact interface text.
- SKILL.md: the main instructions
- REFERENCES.md: links to Vanta's GitHub and demo gallery
- demo/index.html: a standalone demo page with inline CSS and JavaScript
- demo/PROMPT.md: prompts for recreating the demo
How do you trigger the skill with natural requests?
You do not need special syntax. Describe what you want in plain language and mention the background effect, the page or framework, and any brand colours. The skill's own demo prompts start with $vantajs, so you can name the skill directly if you want to be sure it is used.
The skill's guidance also suggests questions the agent may ask you: which effect you want, your brand colours, whether the effect must run on mobile and what frame rate or quality is acceptable, and whether any text sits on top of it and needs contrast.
- Add an animated waves background behind the hero section of my landing page in plain HTML.
- Use $vantajs to add a birds background to my Next.js homepage and clean it up on unmount.
- Change my Vanta fog background to match these brand colours and make it resize with the window.
What do you need before you start?
You need a web page or project. The skill's examples cover static HTML, React, Next.js and Vue. You also need the three.js library, loaded either through a script tag or from npm, and a Vanta.js effect bundle, loaded from a CDN or npm. The skill's examples load these files from public CDNs.
The container element where the effect will render must have an explicit width and height, or be laid out by the page. If it has no size, the effect will not be visible.
- A static HTML page, React, Next.js or Vue project
- three.js, via a script tag or npm
- A Vanta.js effect bundle, via a CDN or npm
- A container element with a set size
What should you check for safety and performance?
The skill does not run scripts. It does use the network, because the examples load three.js and Vanta.js from a CDN or npm. Check that you are comfortable loading those files on your site.
Performance is the main practical risk. Keep to one or two effects per page, because multiple WebGL canvases add GPU load. On phones or older graphics hardware, provide a fallback background colour or image, and consider turning the effect off on small screens. Keep text readable against the animation.
- No scripts are run by the skill; it uses the network to load libraries
- Keep to 1–2 effects per page
- Provide a fallback background colour or image for mobile and older GPUs
- Consider disabling the effect on small screens
- Some framework builds need window.THREE or passing THREE in the options
What people use it for
- Animated waves or fog behind the hero section of a marketing landing page
- A decorative birds or net background on a static HTML site
- A Vanta background inside a React or Next.js component that is cleaned up on unmount
- A quick visual prototype for a designer or small team before a full build
- Recolouring an existing Vanta effect to match a brand after it has loaded
Frequently asked questions
Is the vantajs skill free to use?
The skill is published under the MIT licence, as listed on its page. Vanta.js itself is a separate library that the skill's examples load from a CDN or npm, so check its own terms if you rely on it.
What do I need to use the vantajs skill?
You need a web page or project, such as static HTML, React, Next.js or Vue, plus the three.js library and a Vanta.js effect bundle. The skill's examples load these from a CDN or npm. The container for the effect needs an explicit size.
Where do I put the skill folder?
Unzip it into ~/.claude/skills/ for personal use, or into a project's .claude/skills/ folder to limit it to that project. In the Claude apps, you can upload it under Settings → Capabilities → Skills.
Why is my Vanta background not showing?
The most common cause in the skill's guidance is a container with no size. Give the target element an explicit width and height, or make sure the page layout gives it a size. Also check that three.js and the Vanta bundle are loaded.
Does the skill run code on my computer?
The skill's listing says it does not run scripts. It does use the network to load three.js and Vanta.js from a CDN or npm.
How does this compare with building a three.js scene myself?
The skill covers only Vanta's preset effects, which are built for quick decorative backgrounds. If you need a fully custom 3D scene or heavy interactive graphics, writing your own three.js scene is the better fit.
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Our verdict
This skill suits front-end developers, designers and small teams who want a quick, animated hero background in plain HTML, React, Next.js or Vue without building a WebGL scene. It is a poor choice for fully custom 3D work, heavy interactive graphics, or pages where readability and low-power devices are critical, since the animation adds GPU load.
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