Conciseness

Mostly efficient, opinionated guidance with exact values (cubic-bezier curves, duration tables, the 0.11 velocity threshold), but it spends tokens on concepts Claude already knows — e.g. "Percentage values in translate() are relative to the element's own size", "scale() also scales an element's children", and that CSS animations run off the main thread — plus motivational prose (the Paul Graham quote, 'Taste is trained, not innate'). Not score 4 because these unnecessary explanations are more than minor trimmings in a 675-line body.

Actionability

Fully concrete and executable throughout: ready-to-use CSS (scale(0.97) on :active, @starting-style blocks, tooltip instant-skip pattern), exact easing variables like cubic-bezier(0.32, 0.72, 0, 1), a duration table per element type, a frequency-based animation decision table, a velocity-calculation snippet for swipe dismissal, and a required review table format with correct/incorrect examples. The specific examples cover the common cases (buttons, tooltips, popovers, modals, toasts, drawers) completely; remaining fragments (e.g. '// Start drag...') are peripheral illustrations.

Workflow Clarity

The Animation Decision Framework gives a clear ordered sequence (should this animate → purpose → easing → duration) with an explicit easing decision tree, and the review workflow is unambiguous — a mandatory Before/After/Why markdown table plus a closing Review Checklist mapping issues to fixes. Not score 5 because the 'review your work the next day' and debugging guidance lack concrete checkpoints, and no validation/verification loop exists for the review output itself.

Progressive Disclosure

The single 675-line SKILL.md has strong internal section structure, but no bundle files exist and everything is inlined — deep-dive recipe material (clip-path comparison sliders, orbit keyframes, gesture/drag patterns, spring configuration, debugging tips) that clearly belongs in reference files loads entirely into context on every invocation. Matches anchor 3 (hundreds of lines that could be in a separate file); not score 2 because the internal organization and navigation via headers and tables is genuinely good, and not score 4 because no content at all is split out.

Specificity

The description says it "encodes Emil Kowalski's philosophy on UI polish, component design, animation decisions, and the invisible details" — it names the domain clearly but lists zero concrete actions the skill performs (no 'reviews', 'builds', 'applies'). It is not score 3 because no 1-2 concrete actions are named, and not score 1 because the domain is explicitly identified rather than pure abstraction.

Completeness

The 'what' is reasonably clear (a philosophy on UI polish, component design, and animation decisions), but the 'when' is entirely missing — there is no "Use when..." clause or equivalent trigger guidance, which caps this dimension at 3. Not score 2 because the 'what' is not vague; it names four concrete topical areas.

Trigger Term Quality

Phrases like "UI polish", "component design", and "animation decisions" are natural terms a user might say, but common synonyms such as "motion", "transitions", "micro-interactions", or "CSS animation" are absent, and "the invisible details that make software feel great" is aspirational rather than a trigger phrase. Not score 4 because keyword coverage stops at the domain nouns without variations.

Distinctiveness Conflict Risk

The Emil Kowalski attribution and the focus on animation decisions and UI polish carve out a fairly distinct niche with minor overlap risk against generic frontend-design skills. Not score 5 because without explicit trigger guidance it could fire on any UI/animation request that a general design skill also covers.