Borrowing it
Nothing to install: this file belongs to aziontech/webkit. 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/aziontech/webkit/main/.claude/skills/add-animation/SKILL.mdgit clone --depth 1 https://github.com/aziontech/webkitWrote 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/skills/aziontech/webkit/add-animation)<a href="https://agentmods.dev/skills/aziontech/webkit/add-animation"><img src="https://agentmods.dev/badge/skills/aziontech/webkit/add-animation/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/skills/aziontech/webkit/add-animation"><img src="https://agentmods.dev/badge/skills/aziontech/webkit/add-animation.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 | $0.00054 | $0.02164 |
| Opus 5.5 | $0.00022 | $0.00866 |
| Sonnet 5.5 | $0.00011 | $0.00433 |
| Haiku 4.5 | $0.00005 | $0.00216 |
Grade A, and why
add-animation 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 2mo 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.
How it starts
The opening of the file, as written. The whole thing — 143 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Skill: add-animation
The animation catalog is the single source of truth. A component may only use an
animate-* utility that exists in it. When one is missing, add it here — never inline a
@keyframes in a .vue, never use animate-[…], never hardcode duration-[…] /
cubic-bezier(…). (validate-tokens blocks all of those; validate-spec-compliance
blocks an animate-* not in the catalog.)
First: is this a catalog animation at all?
A keyframe is a fixed journey — it knows both ends before it runs. Three common needs are not
that, and adding a keyframe for them produces an animation that is wrong on every instance but the
one it was authored against. Do not add a catalog entry for these; use the recipe instead
(transition-* + duration-* / ease-* tokens, no new animate-*, no @keyframes):
| Need | Why it cannot be a keyframe | Recipe |
|---|---|---|
| A box that resizes because its content changed (form step swap, panel level change, disclosure between two real heights) | Both heights are runtime facts; auto is not interpolable and must be the resting value |
Measure → mutate → measure while still auto → pin the old value → two requestAnimationFrames → set the new one → release to auto on transitionend and a fallback timer. lib/animate-height.js in the sample app is the working form. |
| A value that grows into place inside an element that keeps its size otherwise (a chip gaining its filter value) | The target width is the content's, unknown at author time | Single-column grid, transition-[grid-template-columns] from grid-cols-[0fr] to grid-cols-[1fr]; keep the clip bare and put padding on the row inside it |
| A composition assembling on first paint, its parts staggered from opposite edges | Per-instance offsets, direction, and a lead/follow delay — a keyframe would fix all three | translate/opacity on data-[entered]: variants, timing inline from the duration / curve tokens, flipped after two requestAnimationFrames. lib/auth-entrance.js in the sample app is the working form. |
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.
- 2mo ago First seen · 143 lines · 54 tokens per session scan A d93b074ebe49
add-animation is a skill published in the GitHub repository aziontech/webkit (3 stars, last pushed today), licensed MIT. It adds 54 tokens to every session and 2,164 once invoked, about $0.0002 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 2026-08-31.
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