Conciseness

The body is lean and assumes Claude's competence — the Check/Fix/Explain/Code Review sections are single tight sentences. Minor trim: the opening 'Navigation latency is one of the biggest contributors...' paragraph (including the Google Search anecdote) is duplicated verbatim in references/rule.md, so it is not quite the every-token-earns-its-place of anchor 5. Not a 3 because there is no real padding or explanation of known concepts.

Actionability

The Fix section offers only high-level direction ('Add a Speculation Rules JSON block targeting the most likely next-page links, starting with prefetch and graduating to prerender') with no code, no example rule, and no syntax — the executable JSON lives only in references/rule.md, matching 'minimal concrete guidance; high-level hints but missing the specific steps'. Not a 3 because there is no pseudocode or partial snippet either; the body gives no concrete artifact to act on. Not a 1 because the Quick Reference does specify concrete mechanisms (href-matches, document rules, CSS selectors).

Workflow Clarity

The Check → Fix → Explain → Code Review structure gives a clear, coherent review sequence, and the progression 'starting with prefetch and graduating to prerender' orders the implementation sensibly. Not a 5 because there is no verification step (e.g., confirming rules took effect via Chrome DevTools' speculation status); not a 3 because no destructive/batch validation cap applies and the sequence has no gaps.

Progressive Disclosure

The body is a concise overview and all implementation detail is split into references/rule.md — a real file, referenced exactly once, clearly signaled ('For full implementation details, code examples, and framework-specific guidance, see references/rule.md'), one level deep. This matches the anchor-5 pattern of a clear overview with a well-signaled single reference. Not a 4 because there are no organization gaps: nothing that belongs in the reference is inlined in the body.

Specificity

The description names the domain ('multi-page navigation performance', 'INP on page transitions', 'progressive enhancement') but states no concrete actions or the actual technique — the Speculation Rules API, prefetch, and prerender are never mentioned, matching the 'names the domain but actions are minimal or generic' anchor. It is not a 1 because the domain terms are concrete rather than purely abstract, and not a 3 because no specific capability (e.g., 'prefetch and prerender navigations') is listed.

Completeness

Only the 'when' is present ('Use when optimising...', 'reducing...', 'or implementing...') with no statement of what the skill does, which is the anchor-2 case 'only when is present without what'. Not a 3 because that anchor requires a clear 'what', which is entirely absent — a reader cannot tell the skill implements the Speculation Rules API.

Trigger Term Quality

Relevant natural phrases are present ('navigation performance', 'page transitions', 'fast page loads'), but the most likely user phrasings — 'prefetch', 'prerender', 'speculation rules', 'instant navigation', 'MPA' — are all missing, matching 'some relevant keywords but missing common variations or synonyms'. Not a 4 because the omission includes the skill's own core vocabulary, not just a few synonyms.

Distinctiveness Conflict Risk

Trigger phrasing around general page-load performance overlaps with other web-performance skills (resource hints, lazy loading, image optimisation), and the distinguishing keyword 'speculation rules' is missing. It is somewhat specific (navigation/INP focus) but could still catch the wrong skill, matching anchor 3. Not a 4 because without the API name the boundary from sibling performance skills is unclear.