Conciseness

The ~35-line body is lean: a one-line value statement, a four-bullet Quick Reference mapping each hint type to its use case, and short imperative sections that assume Claude's knowledge. Minor trimming is possible — the "Check"/"Fix" sections partially restate each other and the Code Review sentence awkwardly repeats the rule title ("loading behavior that affect Use resource hints for faster loading") — so it fits 'Efficient; minor instances of over-explanation that could be trimmed' rather than the flawless anchor 5.

Actionability

The Quick Reference gives concrete, per-hint guidance ("Use preload for critical above-the-fold resources (fonts, hero images)", "Use preconnect for third-party origins (CDNs, APIs, analytics)") and the Fix section names the exact hint types. However, the body itself contains no executable code or commands — all examples are deferred to references/rule.md — so it matches 'Mostly executable guidance; concrete code or commands with minor gaps' rather than anchor 5's copy-paste-ready examples.

Workflow Clarity

The Check → Fix → Explain → Code Review sections form a clear sequence, and validation is present ("verify critical resources use preload/preconnect", "describe the measurement method used to confirm the issue", and the description's mandate to verify the bottleneck before recommending changes). It is not an explicit numbered multi-step workflow with re-check loops, so it matches 'Clear sequence with most checkpoints present; minor validation gaps' rather than anchor 5.

Progressive Disclosure

The body is a concise overview with a single, clearly signaled one-level-deep pointer — "For full implementation details, code examples, and framework-specific guidance, see references/rule.md" — and that file exists with the implementation content (160 lines including HTML examples). Content is appropriately split between overview and detail with easy navigation, matching 'Clear overview with well-signaled one-level-deep references; content appropriately split'.

Specificity

The description names the domain ("auditing slow page loads, heavy assets, or rendering delays") and one or two concrete actions ("Verify the actual bottleneck in DevTools, Lighthouse, or field data before recommending changes"), but the core actions the skill actually performs — applying preload, preconnect, prefetch, or dns-prefetch hints — are never enumerated. This matches the anchor 'Names domain and 1-2 concrete actions, but not comprehensive', not 4, because it does not list several specific actions.

Completeness

An explicit 'when' is present ("Use when auditing slow page loads, heavy assets, or rendering delays...") and a 'what' is present but only via the awkwardly embedded rule title "related to Use resource hints for faster loading" plus the verification action. Both exist yet the 'what' is muddled and imprecise, matching anchor 4 ('Has both what and when; when could be more explicit or specific') rather than 5, which requires a clearly stated what with concrete trigger phrases.

Trigger Term Quality

Natural user phrases like "slow page loads", "heavy assets", "rendering delays", plus tool names "DevTools", "Lighthouse", and "field data" give good keyword coverage. A few natural synonyms are missing (e.g., "page speed", "Core Web Vitals", "LCP", "preload"), so it fits 'Good keyword coverage; a few natural terms missing' rather than the comprehensive anchor 5.

Distinctiveness Conflict Risk

The resource-hints niche is fairly distinct ("related to Use resource hints for faster loading", "Verify the actual bottleneck in DevTools, Lighthouse"), but the broad opening triggers ("slow page loads, heavy assets, rendering delays") overlap with sibling performance-audit skills like image optimization or lazy loading. This fits 'Mostly distinct; minor overlap risk with closely related skills' rather than 5's 'clear niche with distinct triggers'.