Conciseness

Lean and efficient throughout — 'CSS Grid for the three columns; sticky positioning for the rails', 'copy-button affordance (visual only — no JS needed)' — it assumes Claude's competence, teaches only skill-specific constraints, and contains no padding or explanation of known concepts, matching the anchor-5 'every token earns its place' example.

Actionability

Mostly executable guidance with concrete specifics — pixel ranges (240–280px, ~720px, 200–240px), exact logical CSS properties ('margin-inline-start', 'inset-inline-end'), content quotas (350 words, 5–15 line snippet), and a copy-ready <artifact> template. Minor gaps (no sample HTML skeleton, unspecified copy-button/callout rendering) keep it just below the fully-executable anchor 5.

Workflow Clarity

A clear six-step sequence ends in an explicit 'Self-check' step with a five-item validation checklist (line length 60–75 chars, DS mono token, restrained accent, responsive collapse, RTL logical properties), matching the anchor-5 'checklists for complex processes'. No destructive or batch operations, so no cap applies.

Progressive Disclosure

A short (~53-line), single-purpose skill with well-organized Workflow and Output-contract sections, no bundle files and no external references needed — per the rubric's guideline, a short skill with no need for external references scores 5 with just well-organized sections.

Specificity

Names several concrete deliverable components — 'inline-start nav, scrollable article body, inline-end table of contents' — which is more than the 1-2 actions of a score 3, but minor gaps (output medium such as 'one HTML file' and features like code blocks/callouts are only implied) keep it below the comprehensive coverage of a 5.

Completeness

Clearly and explicitly answers both: 'what' is a three-region documentation page (nav, article body, TOC) and 'when' is 'Use when the brief mentions "docs", "documentation", "guide", "API reference", or "tutorial"' with concrete trigger phrases — exactly matching the anchor-5 pattern.

Trigger Term Quality

Good coverage of natural terms users would say ('docs', 'documentation', 'guide', 'API reference', 'tutorial'), but a few natural variations such as 'manual', 'how-to', or 'reference docs' are missing, which fits the 'good keyword coverage; a few natural terms missing' anchor rather than the comprehensive 5.

Distinctiveness Conflict Risk

The specific three-column page deliverable gives it a clear niche with minimal conflict risk, but broad trigger words like 'guide' and 'docs' could overlap with writing- or documentation-generation skills, fitting 'mostly distinct; minor overlap risk with closely related skills' rather than a 5.