Conciseness

The motivational opening ('Without proper ARIA attributes, screen reader users miss critical notifications...') and the Quick Reference bullet explaining what 'polite'/'assertive' mean restate knowledge Claude already has, and the aria-live/role/persistence guidance is repeated across Quick Reference, Check, and Fix. This fits 'mostly efficient but includes some unnecessary explanation or could be tightened'; not a 2 because the body is short and not heavily padded, not a 4 because the cross-section redundancy exceeds minor over-explanation.

Actionability

Concrete attribute names are given ("role='alert' or role='status'", "aria-live='polite' or 'assertive'") — more than high-level hints — but key details are missing: no example markup in SKILL.md, no guidance on when alert vs status applies, and 'adequate display time'/'persist long enough to be read' offer no threshold or verification method. This matches 'some concrete guidance but incomplete; missing key details'; a 4 would need executable-level guidance with only minor gaps.

Workflow Clarity

The Check → Fix → Explain → Code Review sections form a clear, coherent sequence for this simple review task, with the review target (templates, rendered HTML, shared components) explicitly stated — fitting 'clear sequence with most checkpoints present; minor validation gaps'. Not a 5 because there is no re-validation step after Fix and 'adequate display time' leaves the acceptance criterion ambiguous; not a 3 because the sequence is unambiguous for a single-purpose skill.

Progressive Disclosure

A short, well-sectioned body with a clearly signaled, one-level-deep pointer ('For full implementation details, code examples, and framework-specific guidance, see references/rule.md') to a real file that contains substantive implementation detail (code examples, attribute tables) with no nested pointers. The split is clean: overview in SKILL.md, detail in the reference — matching 'clear overview with well-signaled one-level-deep references; content appropriately split'.

Specificity

The description names the domain ("templates, rendered HTML, or shared components") and two concrete actions ("reviewing", "Validate the final browser-facing markup"), but coverage is not comprehensive — it never states what validation involves (aria-live regions, roles, persistence). This matches the 'names domain and 1-2 concrete actions, but not comprehensive' anchor; a 4 would require several specific actions with only minor gaps.

Completeness

Both parts are explicit: 'what' ("Validate the final browser-facing markup, not just the source framework abstraction") and 'when' ("Use when reviewing templates, rendered HTML, or shared components related to Make notifications accessible"), so the 'Use when...' requirement is satisfied. Not a 5 because the 'what' is a single validation action without concrete checks, and the awkward phrasing 'related to Make notifications accessible' slightly muddies the trigger's explicitness.

Trigger Term Quality

Relevant keywords are present ("templates", "rendered HTML", "shared components", "notifications"), but common natural phrasings users would actually say are missing: "accessibility", "ARIA", "aria-live", "screen reader", "toasts". This fits 'some relevant keywords but missing common variations or synonyms'; a 4 would need good coverage with only a few natural terms absent.

Distinctiveness Conflict Risk

Clear niche (accessible notifications in browser-facing markup) with a distinct trigger term ("notifications"), fitting 'mostly distinct; minor overlap risk'. Not a 5 because sibling frontend-checklist rule skills would share the identical boilerplate 'Use when reviewing templates, rendered HTML, or shared components...' trigger, leaving overlap with closely related skills slightly above minimal; not a 3 because the rule-specific differentiator does distinguish it.