animation-performance

animation-performance is a skill for Claude Code, Codex from wangmiaozero/pi-harness. It costs 169 tokens per session (3,190 once invoked), scanned A, original, AGPL-3.0.

A web-animation performance guide that explains how browsers calculate layout, paint pixels, and combine layers, then helps choose cheaper animation methods.

In plain words
What is it for?
Use it to diagnose choppy CSS, Web Animations API, requestAnimationFrame, or Framer Motion effects and choose properties or approaches that cost less.
Why use it?
Animations can drop frames when they make the browser do too much work on the main thread. This helps locate the cause and keep motion responsive.

Skill for Claude CodeCodex

Which agent this was written for is unclear — body not stored (licence); the path alone says nothing.

Good fit Use it to diagnose choppy CSS, Web Animations API, requestAnimationFrame, or Framer Motion effects and choose properties or approaches that cost less.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/wangmiaozero/pi-harness/animation-performance
About the project

Pi-Harness is a desktop workspace for the Pi Coding Agent, a software agent that helps with coding tasks, adding management of sessions, projects, files, Git, models, and skills. It provides tools for observing and controlling runs, recovering work, evaluating results, and coordinating multiple agents across macOS, Windows, and Linux. The catalogue entries are skills and instructions for its agent workflow.

wangmiaozero/pi-harness · 161 stars · on GitHub · wangmiaozero.github.io

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 wangmiaozero/pi-harness --skill animation-performance
Clone the repo
git clone --depth 1 https://github.com/wangmiaozero/pi-harness

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 animation-performance

README.md
[![agentmods](https://agentmods.dev/badge/skills/wangmiaozero/pi-harness/animation-performance/github.svg)](https://agentmods.dev/skills/wangmiaozero/pi-harness/animation-performance)
Your own site
<a href="https://agentmods.dev/skills/wangmiaozero/pi-harness/animation-performance"><img src="https://agentmods.dev/badge/skills/wangmiaozero/pi-harness/animation-performance/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.

agentmods 80×15 button for animation-performance

Your own site · 80×15
<a href="https://agentmods.dev/skills/wangmiaozero/pi-harness/animation-performance"><img src="https://agentmods.dev/badge/skills/wangmiaozero/pi-harness/animation-performance.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 169 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 3,190 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 unknown No closer match found 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 $0.00169 $0.03190
Opus 5.5 $0.00068 $0.01276
Sonnet 5.5 $0.00034 $0.00638
Haiku 4.5 $0.00017 $0.00319

Measured yesterday against content hash ceb9dd3fe912, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

animation-performance 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 yesterday.

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.

resources/builtin-skills/emilkowalski/skills/engineering/animation-performance/SKILL.md · 223 lines

The source is not reproduced here

Licensed AGPL-3.0

The repository is licensed AGPL-3.0, which this catalogue does not treat as permission to reproduce the file. Read it at the source.

Read it on GitHub

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. yesterday First seen · 223 lines · 169 tokens per session scan A ceb9dd3fe912

Subscribe to this mod's changes

animation-performance is a skill published in the GitHub repository wangmiaozero/pi-harness (161 stars, last pushed today), licensed AGPL-3.0. It adds 169 tokens to every session and 3,190 once invoked, about $0.0007 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 2026-10-22.

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