Conciseness

The body is dense and practical — command tables, threshold tables, and concrete checklists with almost no concept tutorials — matching "Efficient; minor instances of over-explanation that could be trimmed". Minor trimmable spots: "check against WCAG AA: 4.5:1 for normal text" (a spec Claude already knows) and the render-blocking explanation in Phase 3; it is far above 3 because there is no padded prose section anywhere.

Actionability

Commands are copy-paste ready with exact signatures and parameters: `navigate_page(url: "<target-url>")`, `performance_start_trace(autoStop: true, reload: true)`, `performance_analyze_insight(insightSetId: "<id-from-trace>", insightName: "LCPBreakdown")`, plus `get_network_request(reqid: <id>)`. This matches "Fully executable; copy-paste ready code or commands; specific examples cover the common cases" — the Quick Reference table and per-phase examples cover the common audit cases; nothing is pseudocode.

Workflow Clarity

A clear five-phase sequence with a copyable progress checklist, tool-discovery precheck, and explicit error-recovery feedback ("If trace returns empty or fails, verify the page loaded... with navigate_page first"; insight-name fallback via trace response) — fitting "Clear sequence with most checkpoints present; minor validation gaps". It does not reach 5 because step 3 of Phase 1 ("Wait for trace completion, then retrieve results") leaves the retrieval command unspecified and later phases have no error handling; this is a read-only audit, so the destructive/batch cap does not apply.

Progressive Disclosure

There are no bundle files (no references/, scripts/, or assets/), so everything lives in a single ~200-line SKILL.md. Structure is good (clear ## sections, tables), but Phase 5's deep codebase material — the nine-row framework/bundler detection table plus tree-shaking, unused-code, polyfill, and compression checklists — is reference-grade content inlined in the overview file, matching "Some structure but could be better organized; ... content that should be separate is inline". It is above 2 because the sections are well organized and the inline content is at least tabular and scannable, not a wall of API reference; it cannot reach 4-5 because the file exceeds the simple-skill threshold and clear reference material is not split out.

Specificity

Quotes: "Audit, diagnose, or optimize website loading and interaction performance, Core Web Vitals, and Lighthouse performance scores." Three concrete verbs (audit, diagnose, optimize) tied to a named domain and specific metric systems (Core Web Vitals, Lighthouse) — matching the anchor "Lists several specific actions; minor gaps in coverage". It does not reach 5 because the body covers more capability (network analysis, accessibility snapshot, codebase analysis) than the description enumerates, leaving minor coverage gaps; it is well above 3 because multiple distinct concrete actions are explicitly named rather than generic.

Completeness

The "what" is clearly answered (audit/diagnose/optimize web performance and Core Web Vitals/Lighthouse scores), but there is no "Use when..." clause or equivalent explicit trigger guidance, which caps completeness at 3 per the judging guidelines. It fits the anchor "Has a clear 'what' but 'when' is missing or only weakly implied" — the when can only be inferred from the domain terms, never stated.

Trigger Term Quality

Strong natural keywords: "website loading", "performance", "Core Web Vitals", "Lighthouse", "interaction performance" — users asking to "audit website performance" or mentioning "Core Web Vitals" / "Lighthouse scores" would match, fitting "Good keyword coverage; a few natural terms missing". It falls short of 5 because common phrasings like "slow site", "page speed", "PageSpeed", or plain "web vitals" are absent, and it is clearly above 3 since several natural, specific trigger phrases are present rather than only technical jargon.

Distinctiveness Conflict Risk

The niche (web performance auditing with "Core Web Vitals" and "Lighthouse" as distinct triggers) is clearly distinguishable from unrelated skills, matching "Mostly distinct; minor overlap risk with closely related skills". It does not score 5 because "optimize website... performance" could overlap with general frontend-development or debugging skills that also touch loading speed; it is well above 3 because the metric-specific triggers make wrong-skill firing unlikely.