Conciseness

The body is lean (~30 lines) with sectioned, checklist-style guidance and no padding of concepts Claude already knows; the one-line vestibular-disorder rationale is minimal and earns its place. It stops short of 5 because the 'Explain' section largely restates the intro sentence and the 'Code Review' section repeats the description's templated phrasing, both of which could be trimmed.

Actionability

The Fix section gives concrete, specific instruction — 'Use scroll-behavior: smooth only within a prefers-reduced-motion media query check' and 'Ensure focus moves to the anchor target' — and the Check section names the exact verification (disable smooth scrolling when prefers-reduced-motion is set). As an instruction-only skill the guidance is mostly executable, but no actual CSS snippet appears inline, leaving minor gaps covered only by the reference file.

Workflow Clarity

The Check → Fix → Explain → Code Review structure gives a clear, unambiguous sequence for this simple single-purpose skill, and the Check step doubles as a verification ('verify smooth scrolling is disabled when prefers-reduced-motion is set'). It misses 5 because the body never says how to emulate prefers-reduced-motion (e.g., browser dev-tools rendering option) — an implicit checkpoint rather than an explicit one.

Progressive Disclosure

The SKILL.md is a concise overview with well-organized sections, and the single bundle file references/rule.md exists and is clearly signaled one level deep: 'For full implementation details, code examples, and framework-specific guidance, see references/rule.md.' Code examples are appropriately deferred to the reference rather than inlined, matching the clear-overview anchor exactly; there is no nesting or buried reference.

Specificity

The description lists several concrete actions — 'Check native semantics first, then inspect keyboard behavior, focus flow, accessible names, and screen-reader output' — which matches the anchor for several specific actions with minor gaps. It does not reach 5 because it omits the skill's core remediation actions (e.g., disabling smooth scroll under prefers-reduced-motion), and is above 3 because coverage goes well beyond naming the domain with 1-2 actions.

Completeness

Both parts are explicitly present: 'what' via 'Check native semantics first, then inspect keyboard behavior, focus flow, accessible names, and screen-reader output' and 'when' via 'Use when reviewing rendered HTML, interactive components, or design-system patterns related to...'. It is below 5 because the 'when' clause is templated and generic rather than giving concrete, rule-specific trigger phrases.

Trigger Term Quality

Includes natural, user-sayable phrases such as 'rendered HTML', 'interactive components', 'anchor scroll', 'keyboard behavior', 'focus flow', and 'screen-reader output', giving good keyword coverage. It falls short of 5 because the most natural trigger terms for this rule — 'smooth scroll(ing)', 'prefers-reduced-motion', 'reduced motion', 'anchor links' — are absent except via the rule title.

Distinctiveness Conflict Risk

The opening trigger ('reviewing rendered HTML, interactive components, or design-system patterns') plus the generic checklist of keyboard/focus/screen-reader checks is boilerplate shared across many accessibility skills, so it would readily fire for sibling rules like focus-order or link-name checks. Only the embedded rule name 'Provide instant anchor scroll option' provides a distinct signal, matching 'somewhat specific but could still overlap with similar skills' rather than the mostly-distinct anchor at 4.