Conciseness

The ~30-line body is dense directive content with no padding and no re-explanation of concepts Claude already knows; statements like 'Prefer transform and opacity. Avoid animating layout properties such as top, left, width, or height' encode taste guidance rather than textbook filler. Every token earns its place, matching the lean-and-efficient anchor.

Actionability

Guidance is concrete: exact durations ('140-220ms for most controls'), specific CSS properties, 'prefers-reduced-motion' fallbacks, and cleanup of observers/timers. No code examples, but the skill is instruction-only and the guidance is actionable, which the scoring notes say not to penalize; minor gaps (no easing/duration pairing example) keep it below fully-executable at 5.

Workflow Clarity

The Workflow section gives a clear sequence (inspect first, pick the smallest set of motion moments, implement, add fallbacks, clean up) and this is not a destructive or batch operation, so no hard cap applies. It misses a 5 because there is no explicit verify step (e.g. testing the reduced-motion fallback in the artifact), leaving a minor validation gap.

Progressive Disclosure

The skill is under 50 lines with no external reference material needed (no references/, scripts/, or assets/ directories exist), and the body is organized into three well-labeled sections (Workflow, Motion Rules, Implementation Notes). This satisfies the simple-skill exception for a top progressive-disclosure score.

Specificity

The description lists several concrete actions ('add tasteful micro-interactions, state transitions, and page motion') with only minor gaps such as no mention of reduced-motion fallbacks or supported frameworks. It falls between the comprehensive anchor (5) and the 1-2-action anchor (3), fitting 'several specific actions; minor gaps in coverage'.

Completeness

Both parts are explicit: what ('add tasteful micro-interactions, state transitions, and page motion with product-grade restraint') and when ('Use after an interface exists'), so the missing-when cap of 3 does not apply. Not a 5 because the when-clause lacks concrete trigger phrases such as 'use when the user asks for motion polish'.

Trigger Term Quality

Natural terms like 'motion-design', 'micro-interactions', 'state transitions', and 'page motion' are present, but common variations users would say ('hover', 'animate', 'transition effects', 'easing') are absent from the description itself (a separate triggers list exists, but the description field has a few natural terms missing). Fits 'good keyword coverage; a few natural terms missing' rather than the comprehensive-synonym anchor at 5.

Distinctiveness Conflict Risk

The motion-polish follow-up niche with an explicit 'after an interface exists' precondition is clearly distinguishable from general design or animation skills. Minor overlap risk remains with generic CSS/animation guidance, matching 'mostly distinct; minor overlap risk' rather than the minimal-conflict anchor at 5.