Agent skill

Animation On Scroll

Create an on-scroll animation trigger using IntersectionObserver with Tailwind-friendly animation classes and keyframes.

Apache-2.0Auto-check passedFrontend & Design

Install Animation On Scroll

skills CLI

$ npx skills add nirholas/three.ws --skill animation-on-scroll -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI

$ gh skill install nirholas/three.ws animation-on-scroll --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy

$ git clone --depth 1 https://github.com/nirholas/three.ws.git skills-src && mkdir -p .claude/skills && cp -r skills-src/third_party/designcode-agent-skills/agent-skills/web-design/animation-on-scroll .claude/skills/animation-on-scroll && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Paste into Claude Code

Install the "animation-on-scroll" agent skill from https://github.com/nirholas/three.ws/tree/main/third_party/designcode-agent-skills/agent-skills/web-design/animation-on-scroll into .claude/skills/animation-on-scroll/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "animation-on-scroll", then confirm the skill loads.

Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

$skill-installer

$skill-installer install https://github.com/nirholas/three.ws/tree/main/third_party/designcode-agent-skills/agent-skills/web-design/animation-on-scroll

Type this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.

skills CLI

$ npx skills add nirholas/three.ws --skill animation-on-scroll -a codex

Project install goes to .agents/skills/; add -g for ~/.codex/skills/.

GitHub CLI

$ gh skill install nirholas/three.ws animation-on-scroll --agent codex

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/nirholas/three.ws.git skills-src && mkdir -p .agents/skills && cp -r skills-src/third_party/designcode-agent-skills/agent-skills/web-design/animation-on-scroll .agents/skills/animation-on-scroll && rm -rf skills-src

Use ~/.agents/skills/ instead of .agents/skills for a personal install.

Codex skills documentation · loads skills from .agents/skills/

Paste into Codex

Install the "animation-on-scroll" agent skill from https://github.com/nirholas/three.ws/tree/main/third_party/designcode-agent-skills/agent-skills/web-design/animation-on-scroll into .agents/skills/animation-on-scroll/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "animation-on-scroll", then confirm the skill loads.

Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

skills CLI

$ npx skills add nirholas/three.ws --skill animation-on-scroll -a cursor

Project install goes to .agents/skills/; add -g for ~/.cursor/skills/.

GitHub CLI

$ gh skill install nirholas/three.ws animation-on-scroll --agent cursor

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/nirholas/three.ws.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/third_party/designcode-agent-skills/agent-skills/web-design/animation-on-scroll .cursor/skills/animation-on-scroll && rm -rf skills-src

Use ~/.cursor/skills/ instead of .cursor/skills for a personal install.

Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/

Paste into Cursor

Install the "animation-on-scroll" agent skill from https://github.com/nirholas/three.ws/tree/main/third_party/designcode-agent-skills/agent-skills/web-design/animation-on-scroll into .cursor/skills/animation-on-scroll/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "animation-on-scroll", then confirm the skill loads.

Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

gemini skills install

$ gemini skills install https://github.com/nirholas/three.ws.git --path third_party/designcode-agent-skills/agent-skills/web-design/animation-on-scroll

--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.

skills CLI

$ npx skills add nirholas/three.ws --skill animation-on-scroll -a gemini-cli

Project install goes to .agents/skills/; add -g for ~/.gemini/skills/.

GitHub CLI

$ gh skill install nirholas/three.ws animation-on-scroll --agent gemini-cli

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/nirholas/three.ws.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/third_party/designcode-agent-skills/agent-skills/web-design/animation-on-scroll .gemini/skills/animation-on-scroll && rm -rf skills-src

Use ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.

Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/

Paste into Gemini CLI

Install the "animation-on-scroll" agent skill from https://github.com/nirholas/three.ws/tree/main/third_party/designcode-agent-skills/agent-skills/web-design/animation-on-scroll into .gemini/skills/animation-on-scroll/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "animation-on-scroll", then confirm the skill loads.

Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

GitHub CLI

$ gh skill install nirholas/three.ws animation-on-scroll

Installs for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).

skills CLI

$ npx skills add nirholas/three.ws --skill animation-on-scroll -a github-copilot

Project install goes to .agents/skills/; add -g for ~/.copilot/skills/.

Manual copy

$ git clone --depth 1 https://github.com/nirholas/three.ws.git skills-src && mkdir -p .github/skills && cp -r skills-src/third_party/designcode-agent-skills/agent-skills/web-design/animation-on-scroll .github/skills/animation-on-scroll && rm -rf skills-src

Use ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.

GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/

Paste into GitHub Copilot

Install the "animation-on-scroll" agent skill from https://github.com/nirholas/three.ws/tree/main/third_party/designcode-agent-skills/agent-skills/web-design/animation-on-scroll into .github/skills/animation-on-scroll/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "animation-on-scroll", then confirm the skill loads.

GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

skills CLI

$ npx skills add nirholas/three.ws --skill animation-on-scroll -a opencode

OpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.

GitHub CLI

$ gh skill install nirholas/three.ws animation-on-scroll --agent opencode

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/nirholas/three.ws.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/third_party/designcode-agent-skills/agent-skills/web-design/animation-on-scroll .opencode/skills/animation-on-scroll && rm -rf skills-src

Use ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.

OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/

Paste into OpenCode

Install the "animation-on-scroll" agent skill from https://github.com/nirholas/three.ws/tree/main/third_party/designcode-agent-skills/agent-skills/web-design/animation-on-scroll into .opencode/skills/animation-on-scroll/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "animation-on-scroll", then confirm the skill loads.

OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

Facts

Skill name: animation-on-scroll
GitHub stars: 226
Used in: 1 other repo
Token cost: ~888 tokens
SKILL.md length: 183 words
Files: 4
Skills in repo: 165
Repo updated: Oct 7, 2026
First seen: Oct 7, 2026
Licence: Apache-2.0

At a glance

Create an on-scroll animation trigger using IntersectionObserver with Tailwind-friendly animation classes and keyframes.

Works in 3 steps: Confirm animation style, timing, and… → Provide the keyframes + JS observer… → Offer focused tweaks only (threshold,…
Using IntersectionObserver with Tailwind-friendly animation classes and keyframes
SKILL.md covers Workflow, Usage checklist, IntersectionObserver trigger and Keyframes, plus 4 more sections
Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md

What it does

Animation On Scroll is an agent skill from nirholas/three.ws. Create an on-scroll animation trigger using IntersectionObserver with Tailwind-friendly animation classes and keyframes. Use when asked for scroll-reveal, animate-on-scroll, or sequencing element animations when they enter the viewport.

Its SKILL.md is about 890 tokens, which your agent loads only when the skill is triggered. The skill folder holds 4 other files (for example `demo/PROMPT.md`).

It sits in Frontend & Design, covering Web animation and motion and CSS and styling. It works with Tailwind CSS. The repository describes itself as: Open-source platform for 3D AI agents. Turn text or a photo into a rigged, animated GLB avatar, give it an LLM brain, memory and a wallet, and embed it anywhere with one web… The licence is Apache-2.0.

When your agent uses it

Using IntersectionObserver with Tailwind-friendly animation classes and keyframes
Asked for scroll-reveal
Animate-on-scroll
Sequencing element animations when they enter the viewport

Example prompts

“/animation-on-scroll”

Workflow steps

3 steps, taken from the first numbered list in SKILL.md.

Confirm animation style, timing, and whether animations should run once or repeat.
Provide the keyframes + JS observer snippet and the exact Tailwind class to apply.
Offer focused tweaks only (threshold, rootMargin, duration, delay, transform/blur values).

What it can do on your machine

Read from SKILL.md and the folder at commit 238ef60. It shows what the files ask for, not the result of running them.

Tool permissions
Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.
From allowed-tools in the SKILL.md frontmatter.
Runs code
No scripts in the folder and no shell commands in SKILL.md (its code samples are html).
From the folder's file list and the shell code blocks in SKILL.md.
Network
No URLs in SKILL.md.
From URLs in SKILL.md, links to its own repository left out.
Credentials
Names no API keys, tokens, secrets or passwords.
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Animation On Scroll loads about 888 tokens when it runs. Until then it costs about 64 tokens; SKILL.md has 183 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it: ~64
When it runs · the whole SKILL.md, loaded when a task matches: ~888

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check passed

The automated check found no risky patterns in SKILL.md.

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from nirholas/three.ws at commit 238ef60, republished under its Apache-2.0 licence (© nirholas). 183 words, ~888 tokens.

Download SKILL.mdSave it as .claude/skills/animation-on-scroll/SKILL.md (or your agent's skills folder). This skill also uses 3 other files; get the full folder from GitHub.

name: animation-on-scroll
description: Create an on-scroll animation trigger using IntersectionObserver with Tailwind-friendly animation classes and keyframes. Use when asked for scroll-reveal, animate-on-scroll, or sequencing element animations when they enter the viewport.

Animation On Scroll Skill

Workflow

Confirm animation style, timing, and whether animations should run once or repeat.
Provide the keyframes + JS observer snippet and the exact Tailwind class to apply.
Offer focused tweaks only (threshold, rootMargin, duration, delay, transform/blur values).

Usage checklist

Insert the JS snippet in the <head> after the keyframes.
Add the animation class and animate-on-scroll to elements.
Ensure your keyframes name matches the Tailwind animation reference.

IntersectionObserver trigger

html

<script>
  /*
    Sequence animation on scroll when visible. Requires Animation Keyframe. Usage:

    1) Insert this code in the <head> along with the Animation Keyframe code.

    2) Add to Tailwind Classes: [animation:animationIn_0.8s_ease-out_0.1s_both] animate-on-scroll
  */
  (function () {
    // Inject CSS for paused/running states
    const style = document.createElement("style");
    style.textContent = `
      /* Default: paused */
      .animate-on-scroll { animation-play-state: paused !important; }
      /* Activated by JS */
      .animate-on-scroll.animate { animation-play-state: running !important; }
    `;
    document.head.appendChild(style);

    const once = true;

    if (!window.__inViewIO) {
      window.__inViewIO = new IntersectionObserver((entries) => {
        entries.forEach((entry) => {
          if (entry.isIntersecting) {
            entry.target.classList.add("animate");
            if (once) window.__inViewIO.unobserve(entry.target);
          }
        });
      }, { threshold: 0.2, rootMargin: "0px 0px -10% 0px" });
    }

    window.initInViewAnimations = function (selector = ".animate-on-scroll") {
      document.querySelectorAll(selector).forEach((el) => {
        window.__inViewIO.observe(el); // observing twice is a no-op
      });
    };

    document.addEventListener("DOMContentLoaded", () => initInViewAnimations());
  })();
</script>

Keyframes

html

<style>
  /*
    Sequence animation intro. Usage:

    1) Insert this code in the <head>

    2) Add to Tailwind Classes: [animation:animationIn_0.8s_ease-out_0.1s_both]
  */
  @keyframes animationIn {
    0% {
      opacity: 0;
      transform: translateY(30px);
      filter: blur(8px);
    }

    100% {
      opacity: 1;
      transform: translateY(0);
      filter: blur(0px);
    }
  }
</style>

Tailwind example

html

<div class="animate-on-scroll [animation:animationIn_0.8s_ease-out_0.1s_both]">
  ...
</div>

Customization knobs

Trigger: adjust threshold and rootMargin for earlier/later reveals.
Repeat: set once = false to allow replays when re-entering.
Motion: tweak translateY and blur in keyframes.
Timing: change duration and delay in the Tailwind animation value.

Common pitfalls

Forgetting to include the keyframes before the JS snippet.
Using a different keyframe name than in the Tailwind animation.
Animations not running because the element is already in view before observer init.

Questions to ask when specs are missing

Should animations run once or every time the element re-enters?
How far before entering the viewport should they start?
What motion style (fade, slide, blur, scale) do you want?

Files

SKILL.md and 3 other files in third_party/designcode-agent-skills/agent-skills/web-design/animation-on-scroll of nirholas/three.ws.

SKILL.md
demo/PROMPT.md
demo/index.html
demo/preview.jpg

Open the folder on GitHubat commit 238ef60

Used in 1 other repository

We found 1 copy of this SKILL.md (exact, near-identical or edited) in other folders, from 1 other GitHub owner. This page covers the copy in nirholas/three.ws, which our catalogue first saw on October 7, 2026.

MengTo/Skillsagent-skills/web-design/animation-on-scroll

Compare with similar skills

Animation On Scroll next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Animation On Scroll compared with similar skills
Skill	Stars	Used in	Tokens	Auto-check	Licence	Repo updated
Animation On Scroll this skillnirholas/three.ws	226	1 repos	~888	Automated safety check: Pass	Apache-2.0	today
Phantom Motionpixelxzen/phantom-motion	185	—	~1k	Automated safety check: Pass	Apache-2.0	4 mo ago
Frontend UI Animatorjulianromli/opencode-template	144	—	~1.2k	Automated safety check: Pass	None	8 mo ago
Motiontheexperiencecompany/gaia	308	—	~6.7k	Automated safety check: Pass	Custom licence	today
Clone AnywebsiteSylphAI-Inc/skills	111	—	~10k	Automated safety check: Pass	None	14 days ago
Tailwindcss Developmentanonaddy/anonaddy	4.9k	10 repos	~865	Automated safety check: Pass	MIT	yesterday

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Works with

Tailwind CSS

Questions about Animation On Scroll

What does Animation On Scroll do?

Create an on-scroll animation trigger using IntersectionObserver with Tailwind-friendly animation classes and keyframes. ws. Create an on-scroll animation trigger using IntersectionObserver with Tailwind-friendly animation classes and keyframes.

When should I use Animation On Scroll?

Animation On Scroll fits situations like: using IntersectionObserver with Tailwind-friendly animation classes and keyframes; asked for scroll-reveal; animate-on-scroll; sequencing element animations when they enter the viewport.

How do I install Animation On Scroll in Claude Code?

Run `npx skills add nirholas/three.ws --skill animation-on-scroll -a claude-code`. Or copy the skill folder (third_party/designcode-agent-skills/agent-skills/web-design/animation-on-scroll in nirholas/three.ws) into .claude/skills/animation-on-scroll in your project. Claude Code loads it when a task matches its description.

How do I install Animation On Scroll in Codex?

Run `npx skills add nirholas/three.ws --skill animation-on-scroll -a codex`. Or copy the skill folder (third_party/designcode-agent-skills/agent-skills/web-design/animation-on-scroll in nirholas/three.ws) into .agents/skills/animation-on-scroll in your project. Codex loads it when a task matches its description.

Can I use Animation On Scroll in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add nirholas/three.ws --skill animation-on-scroll -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/animation-on-scroll, .gemini/skills/animation-on-scroll, .github/skills/animation-on-scroll and .opencode/skills/animation-on-scroll in your project.

What does Animation On Scroll need to run?

SKILL.md names no scripts, command-line tools or credentials: Animation On Scroll is instructions for the agent only.

Does Animation On Scroll access the network?

SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.

Is Animation On Scroll safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.

What licence does Animation On Scroll use?

Animation On Scroll is published under the Apache-2.0 licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Animation On Scroll use?

About 888 tokens (SKILL.md is roughly 3.6k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.

What are the alternatives to Animation On Scroll?

Skills that share tags, products or a category with Animation On Scroll: Phantom Motion (pixelxzen/phantom-motion, 185 stars), Frontend UI Animator (julianromli/opencode-template, 144 stars), Motion (theexperiencecompany/gaia, 308 stars) and Clone Anywebsite (SylphAI-Inc/skills, 111 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Animation On Scroll?

nirholas (a GitHub user) maintains it in nirholas/three.ws, which has 226 GitHub stars. The repository holds 165 skills in this directory. The repository was last updated on October 7, 2026.

Source: nirholas/three.ws on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.

Install Animation On Scroll

Facts

At a glance

What it does

When your agent uses it

Example prompts

Workflow steps

What it can do on your machine

Tool permissions

Runs code

Network

Credentials

Context cost

Safety

SKILL.md

Animation On Scroll Skill

Workflow

Usage checklist

IntersectionObserver trigger

Keyframes

Tailwind example

Customization knobs

Common pitfalls

Questions to ask when specs are missing

Files

Used in 1 other repository

Compare with similar skills

Similar skills

More from nirholas/three.ws

Related

Questions about Animation On Scroll