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 skills add mathofdynamic/entrance-motion-skill --skill entrance-motiongit clone --depth 1 https://github.com/mathofdynamic/entrance-motion-skillWrote 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/mathofdynamic/entrance-motion-skill/entrance-motion)<a href="https://agentmods.dev/skills/mathofdynamic/entrance-motion-skill/entrance-motion"><img src="https://agentmods.dev/badge/skills/mathofdynamic/entrance-motion-skill/entrance-motion/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/mathofdynamic/entrance-motion-skill/entrance-motion"><img src="https://agentmods.dev/badge/skills/mathofdynamic/entrance-motion-skill/entrance-motion.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 | $0.00078 | $0.02090 |
| Opus 5.5 | $0.00031 | $0.00836 |
| Sonnet 5.5 | $0.00016 | $0.00418 |
| Haiku 4.5 | $0.00008 | $0.00209 |
Grade A, and why
entrance-motion 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 — 144 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Entrance Motion
Use this skill to add or repair one shared entrance-motion system in an existing frontend. Preserve the project’s architecture and existing motion primitives where they are sound. Wire the same system into page composition and shared transient-surface primitives. Do not create competing animation systems for individual pages, menus, or popups.
Boundaries
- Do not add a loading screen, spinner, artificial blank state, arbitrary wait, or font-blocking gate.
- Do not use this skill for parallax, animated backgrounds, particles, infinite loops, hover-only effects, or continuous scroll-linked motion.
- Do not hide content from assistive technology or make JavaScript a requirement for reading the page.
- Do not add a motion library unless the project already uses one or the implementation has a clear, measured need.
- Treat the defaults below as the contract. Deviate only for a documented project constraint, accessibility requirement, or verified rendering problem.
1. Audit before editing
Inspect the frontend before choosing an implementation point:
- Identify the framework, rendering mode, hydration boundary, route structure, CSS entrypoints, theme system, and font-loading behavior.
- Find existing transitions, animation libraries,
IntersectionObserverusage, global layout wrappers, and page or section primitives. - Check whether the app already has a reveal or visibility state. Extend one coherent system where possible.
- Record representative routes: a home page, an inner/content page, a long page, a list or grid, and an empty or error state when they exist.
- Keep the change local to the motion system and its integration points. Do not rewrite unrelated layout or styling.
2. Apply the motion contract
Centralize these tokens so the stagger is derived from the duration rather than copied as page-specific numbers:
| Token | Default |
|---|---|
| Duration | 100ms |
| Easing | cubic-bezier(.16, 1, .3, 1) |
| Properties | opacity, transform only |
| Initial transform | translate3d(0, 20px, 0) |
| Final transform | translate3d(0, 0, 0) |
| Inter-item gap | 0ms |
| Lead between item starts | duration / 3 (about 33ms at the default) |
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.
- 2mo ago First seen · 144 lines · 78 tokens per session scan A 8d1f3d71564e
entrance-motion is a skill published in the GitHub repository mathofdynamic/entrance-motion-skill (11 stars, last pushed 2mo ago), licensed MIT. It adds 78 tokens to every session and 2,090 once invoked, about $0.0003 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.
entrance-motion compared with skills from other repositories
| Mod | Type | Stars | Last push | Licence | Scan | Tokens | Works with |
|---|---|---|---|---|---|---|---|
| entrance-motionmathofdynamic/entrance-motion-skill | Skill | 11 | 2mo ago | MIT | A | 78 | Codex |
| anti-slop-designsickn33/agentic-awesome-skills | Skill | 49k | yesterday | MIT | A | 34 | Claude Code |
| chakra-ui-builderchakra-ui/chakra-ui | Skill | 41k | yesterday | MIT | A | 214 | Claude Code, Codex |
| visual-ralphYeachan-Heo/oh-my-codex | Skill | 34k | 3d ago | MIT | A | 52 | Codex |
| open-design-setupcompozy/compozy | Skill | 2.8k | yesterday | MIT | A | 67 | Claude Code, Codex |
| edit-sitemicrosoft/power-platform-skills | Skill | 1.1k | yesterday | MIT | A | 104 | Claude Code |
| frontend-visual-qadaymade/claude-code-skills | Skill | 1.5k | yesterday | MIT | A | 125 | Claude Code, Codex |