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Design engineering principles for making interfaces feel polished.
Passed 21 of 22 test cases with the skill, and 16 of 22 without it.
and 3 more in the full report
6 fixed15 passed either way0 still failing1 broke
Tokens, turns and time describe resource use, not a dollar price.
One of 6 test cases the skill fixed. Same model, same prompt, with and without the skill.
We are configuring spring transition properties for toggling state icons in a React component using scale, opacity, and blur. Should bounce be set to 0.2 for a friendly feel?
| Checked | Without skill | With skill |
|---|---|---|
| Sets bounce to 0 in the spring transition configuration | Missed | Passed |
The instructions your model reads when the skill loads.
|
| Typography | Text wrapping, font smoothing, tabular numbers |
| Surfaces | Border radius, optical alignment, shadows, image outlines, hit areas |
| Animations | Interruptible animations, enter/exit transitions, icon animations, scale on press |
| Performance | Transition specificity, will-change usage |
Outer radius = inner radius + padding. Mismatched radii on nested elements is the most common thing that makes interfaces feel off.
When geometric centering looks off, align optically. Buttons with icons, play triangles, and asymmetric icons all need manual adjustment.
Layer multiple transparent box-shadow values for natural depth. Shadows adapt to any background; solid borders don't.
Use CSS transitions for interactive state changes — they can be interrupted mid-animation. Reserve keyframes for staged sequences that run once.
Don't animate a single container. Break content into semantic chunks and stagger each with ~100ms delay.
Use a small fixed translateY instead of full height. Exits should be softer than enters.
Animate icons with opacity, scale, and blur instead of toggling visibility. Use exactly these values: scale from 0.25 to 1, opacity from 0 to 1, blur from 4px to 0px. If the project has motion or framer-motion in package.json, use transition: { type: "spring", duration: 0.3, bounce: 0 } — bounce must always be 0. If no motion library is installed, keep both icons in the DOM (one absolute-positioned) and cross-fade with CSS transitions using cubic-bezier(0.2, 0, 0, 1) — this gives both enter and exit animations without any dependency.
Apply -webkit-font-smoothing: antialiased to the root layout on macOS for crisper text.
test cases passed, vs 16 / 22 without
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