Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx agentmods add skills/athevon/genjutsu/css-nativenpx skills add AThevon/genjutsu --skill css-nativegit clone --depth 1 https://github.com/AThevon/genjutsuWhat 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 | $0.00025 | $0.02186 |
| Opus 5 | $0.00013 | $0.01093 |
| Sonnet 5 | $0.00005 | $0.00437 |
| Haiku 4.5 | $0.00003 | $0.00219 |
Grade A, and why
css-native 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 2d 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.
This is a copy
89% identical to css-native — 12 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.
How it starts
The opening of the file, as written. The whole thing — 320 lines — stays where its author put it; the contents beside it link to each section on GitHub.
CSS Native — Zero-Dependency Animations & Visual Techniques
When to Use CSS Native vs Library
| Situation | Decision |
|---|---|
| < 3 animations on the page | CSS native |
| Scroll-driven reveal/parallax | CSS native (animation-timeline) |
Enter/exit from display: none |
CSS native (@starting-style + transition-behavior: allow-discrete) |
| Tooltip/popover positioning | CSS native (anchor positioning) |
| Page transitions (MPA or SPA) | CSS native (View Transitions API) |
| Complex multi-step timeline (5+ tweens) | GSAP |
| Stagger across dynamic list (unknown count) | GSAP or Framer Motion |
| Physics-based spring with interruption | Framer Motion |
| Morph between SVG shapes | GSAP MorphSVG |
Rule of thumb: if you can express it in a @keyframes + one animation-timeline, stay in CSS. The moment you need imperative control, sequence coordination, or runtime values — reach for a library.
Scroll-Driven Animations
Scroll Progress Timeline
Animate based on scroll position of a container.
.progress-bar {
animation: grow-width linear both;
animation-timeline: scroll(root block);
}
@keyframes grow-width {
from { transform: scaleX(0); }
to { transform: scaleX(1); }
}
scroll(<scroller> <axis>)— scroller:nearest|root|self, axis:block|inline|x|y- Default:
scroll(nearest block)
View Progress Timeline
Animate as an element enters/exits the scrollport.
.reveal {
animation: fade-in linear both;
animation-timeline: view();
animation-range: entry 0% entry 100%;
}
@keyframes fade-in {
from { opacity: 0; transform: translateY(2rem); }
to { opacity: 1; transform: translateY(0); }
}
animation-range
Controls which segment of the timeline drives the animation.
/* Named ranges: cover | contain | entry | exit | entry-crossing | exit-crossing */
animation-range: entry 0% entry 100%; /* animate during entry only */
animation-range: contain 0% contain 100%; /* animate while fully visible */
animation-range: entry 25% exit 75%; /* custom start/end */
What ships with it
1 file beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
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.
- 2d ago First seen · 320 lines · 25 tokens per session scan A 016569d40213
css-native is a skill published in the GitHub repository AThevon/genjutsu (309 stars, last pushed 1mo ago), licensed MIT. It adds 25 tokens to every session and 2,186 once invoked, about $0.0001 per session on Opus 5. A static security scan graded it A with 0 findings. It is 89% identical to css-native, differing in 12 lines, and is treated as a copy.
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