anim-flash

anim-flash is a skill for Claude Code, Codex from nexu-io/motion-anything. It costs 46 tokens per session (326 once invoked), scanned A, a copy of anim-backindown, Apache-2.0.

A CSS keyframe animation that repeatedly makes an element briefly appear brighter or less visible, without JavaScript.

In plain words
What is it for?
Use it to draw attention to a web page element, sparingly. It respects users who prefer reduced motion.
Why use it?
It provides a ready-made emphasis effect, so you do not need to build the motion yourself.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one.

Good fit Use it to draw attention to a web page element, sparingly. It respects users who prefer reduced motion.

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Install with agentmods
npx agentmods add skills/nexu-io/motion-anything/anim-flash
Install

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.

Any agent
npx skills add nexu-io/motion-anything --skill anim-flash
Clone the repo
git clone --depth 1 https://github.com/nexu-io/motion-anything

Made for: Claude Code, Codex.

Wrote 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.

agentmods badge for anim-flash

README.md
[![agentmods](https://agentmods.dev/badge/skills/nexu-io/motion-anything/anim-flash.svg)](https://agentmods.dev/skills/nexu-io/motion-anything/anim-flash)
Your own site
<a href="https://agentmods.dev/skills/nexu-io/motion-anything/anim-flash"><img src="https://agentmods.dev/badge/skills/nexu-io/motion-anything/anim-flash.svg" alt="Measured on agentmods" height="20"></a>
Per session 46 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 326 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin 84% copy Near-identical to another mod in the catalogue.
Token cost

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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00046 $0.00326
Opus 5 $0.00023 $0.00163
Sonnet 5 $0.00009 $0.00065
Haiku 4.5 $0.00005 $0.00033

Measured 4d ago against content hash 46c7961f1938, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-07, from the pricing page.

Security

Grade A, and why

anim-flash 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 4d 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.

Origin

This is a copy

84% identical to anim-backindown — 18 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.

recipes/css/anim-flash/SKILL.md · 41 lines

What it actually says

Animate · Flash

Flash — CSS keyframe animation from Animate.css (Hippocratic License 2.1, © Daniel Eden). Part of motion-anything.

When to use it

  • A quick, drop-in CSS emphasis animation (no JS).

When NOT to use it (restraint)

  • Many at once / must-read content. Keep it restrained.

How to apply

  1. Copy flash.css. 2. Add class flash to the element + set animation-duration.

Accessibility & license

  • prefers-reduced-motion: disabled. Attribute Animate.css (Hippocratic-2.1).
Files

What ships with it

3 files 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.

Changes

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.

  1. 4d ago First seen · 41 lines · 46 tokens per session scan A 46c7961f1938

Subscribe to this mod's changes

anim-flash is a skill published in the GitHub repository nexu-io/motion-anything (762 stars, last pushed 2mo ago), licensed Apache-2.0. It adds 46 tokens to every session and 326 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 0 findings. It is 84% identical to anim-backindown, differing in 18 lines, and is treated as a copy.

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