UI Skills is a collection of skills and lessons for design engineers working on user interfaces. Developers and coding agents use it through a command-line interface or MCP tools to browse and retrieve design-engineering guidance. The catalogue add-ons contain selected UI skills and an instruction for using them.
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 ibelick/ui-skills --skill fixing-motion-performancegit clone --depth 1 https://github.com/ibelick/ui-skillsWrote 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/ibelick/ui-skills/fixing-motion-performance)<a href="https://agentmods.dev/skills/ibelick/ui-skills/fixing-motion-performance"><img src="https://agentmods.dev/badge/skills/ibelick/ui-skills/fixing-motion-performance.svg" alt="Measured on agentmods" height="20"></a>- Socket pass
- Snyk pass
- NVIDIA SkillSpector pass
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 | $0.00045 | $0.01184 |
| Opus 5 | $0.00023 | $0.00592 |
| Sonnet 5 | $0.00009 | $0.00237 |
| Haiku 4.5 | $0.00005 | $0.00118 |
Grade A, and why
fixing-motion-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 8d 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.
Copies of this mod
3 near-identical copies found in the catalogue:
- fixing-motion-performance — 100% identical, 0 lines differ
- fixing-motion-performance — 100% identical, 0 lines differ
- fixing-motion-performance — 92% identical, 39 lines differ
How it starts
The opening of the file, as written. The whole thing — 152 lines — stays where its author put it; the contents beside it link to each section on GitHub.
fixing-motion-performance
Fix animation performance issues.
how to use
-
/fixing-motion-performanceApply these constraints to any UI animation work in this conversation. -
/fixing-motion-performance <file>Review the file against all rules below and report:- violations (quote the exact line or snippet)
- why it matters (one short sentence)
- a concrete fix (code-level suggestion)
Do not migrate animation libraries unless explicitly requested. Apply rules within the existing stack.
when to apply
Reference these guidelines when:
- adding or changing UI animations (CSS, WAAPI, Motion, rAF, GSAP)
- refactoring janky interactions or transitions
- implementing scroll-linked motion or reveal-on-scroll
- animating layout, filters, masks, gradients, or CSS variables
- reviewing components that use will-change, transforms, or measurement
rendering steps glossary
- composite: transform, opacity
- paint: color, borders, gradients, masks, images, filters
- layout: size, position, flow, grid, flex
rule categories by priority
| priority | category | impact |
|---|---|---|
| 1 | never patterns | critical |
| 2 | choose the mechanism | critical |
| 3 | measurement | high |
| 4 | scroll | high |
| 5 | paint | medium-high |
| 6 | layers | medium |
| 7 | blur and filters | medium |
| 8 | view transitions | low |
| 9 | tool boundaries | critical |
quick reference
1. never patterns (critical)
- do not interleave layout reads and writes in the same frame
- do not animate layout continuously on large or meaningful surfaces
- do not drive animation from scrollTop, scrollY, or scroll events
- no requestAnimationFrame loops without a stop condition
- do not mix multiple animation systems that each measure or mutate layout
2. choose the mechanism (critical)
- default to transform and opacity for motion
- use JS-driven animation only when interaction requires it
- paint or layout animation is acceptable only on small, isolated surfaces
- one-shot effects are acceptable more often than continuous motion
- prefer downgrading technique over removing motion entirely
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.
- 8d ago First seen · 152 lines · 45 tokens per session scan A 0a2d654902bc
fixing-motion-performance is a skill published in the GitHub repository ibelick/ui-skills (8,224 stars, last pushed 2d ago), licensed MIT. It adds 45 tokens to every session and 1,184 once invoked, about $0.0002 per session on Opus 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 2026-08-30.
Other skills, from other repositories
ui-debug-workflow
Debug UI changes with a repeatable evidence-first workflow. Use when validating visual regressions, reproducing frontend bugs, comparing baseline vs changed behavior, collecting screenshots/DOM/logs, or producing stakeholder-ready UI debug reports. Keywords: ui bug, visual regression, browser devtools, playwright…
frontend-visual-verification
Confirm a CSS/HTML/template change actually rendered in a running browser — without being fooled by stale browser cache. Use whenever you edited frontend code (CSS, EJS/HTML, components) and must verify the visual result, especially when a vision screenshot seems to contradict the DOM or the served asset.
implementation-debugging
Use when animation doesn't work as expected, has bugs, or behaves inconsistently.
performance-optimization
Use when animation runs slow, janky, or causes frame drops.
inspecting-hermes-desktop-dom
When you are developing apps/desktop and the user is running that same app (hgui / npm run dev), you can read the live rendered DOM of the window they are looking at — computed styles, geometry, which CSS rule actually won, console output — instead of inferring it from .tsx and being wrong.
inspecting-hermes-desktop-dom
Read the live Hermes desktop DOM/CSS over CDP.