Conciseness

The body is mostly non-obvious, genuinely useful guidance (exact palettes, font pairings, the stateDiagram-v2 parser caveat, the .node CSS collision constraint) rather than explanations of things Claude already knows, but it is noticeably repetitive: the forbidden font/color lists appear nearly verbatim in both "3. Style" and "Anti-Patterns", the ASCII-table proactive rule appears three times (intro, "Prose patterns" area, Data Tables), and Mermaid TD-vs-LR and zoom-control guidance are each repeated across multiple sections. This lands on anchor 3 ("Mostly efficient but... could be tightened") — above anchor 2's padded explanations, below anchor 4's minor trimmings.

Actionability

Guidance is copy-paste ready throughout: exact hex palettes ("Terracotta + sage (#c2410c, #65a30d)"), named font pairings, a rendering-approach decision table keyed by content type, executable shell commands ("open ~/.agent/diagrams/filename.html", "xdg-open", "which surf", base64 encoding with macOS/Linux variants), a complete HTML file skeleton, and CSS theming snippets. This matches anchor 5 ("Fully executable; copy-paste ready code or commands; specific examples cover the common cases") and clearly exceeds anchor 4's "minor gaps".

Workflow Clarity

The four-step workflow (Think → Structure → Style → Deliver) is clearly sequenced, includes mandatory pre-generation checkpoints ("Read the reference material before generating" with per-content-type file routing), and ends with an explicit pre-delivery validation checklist ("Before delivering, verify: ... Both themes ... No overflow ... File opens cleanly: No console errors") plus a regeneration feedback loop ("If two or more of these are present, the page is slop. Regenerate with a different aesthetic direction"). This matches anchor 5's explicit validation steps, feedback loops, and checklists for complex processes; operations here are not destructive/batch, so no cap applies.

Progressive Disclosure

Structure is good: all four references/*.md files exist, are one level deep, and are clearly signaled with routing rules ("For pages with 4+ sections, also read ./references/responsive-nav.md"; slide mode gated on explicit opt-in with its own reference). However, the body repeatedly points to ./templates/architecture.html, ./templates/mermaid-flowchart.html, ./templates/data-table.html, and ./templates/slide-deck.html — none of which exist in the bundle — and ~400 lines of slide-deck and anti-pattern detail are inlined that could live in the existing reference files. This fits anchor 4 ("Good structure; most content is appropriately placed; references mostly clear; minor organization gaps") rather than anchor 5's clean navigable split, and is well above anchor 3's buried references.

Specificity

"Generate beautiful, self-contained HTML pages that visually explain systems, code changes, plans, and data" names the domain and a concrete primary action, which would otherwise rate 4, but the clause "Also use proactively when you are about to render a complex ASCII table" is second-person voice and the rubric mandates a 1-point specificity penalty for that. "beautiful" is also mild fluff. It sits above anchor 2 ("Names the domain but actions are minimal or generic") because the output form and content types are concrete, and below anchor 4 because of the voice penalty and single-verb action coverage.

Completeness

Both questions are answered explicitly: what — "Generate beautiful, self-contained HTML pages that visually explain systems, code changes, plans, and data"; when — "Use when the user asks for a diagram, architecture overview, diff review... or any visual explanation" plus a proactive trigger for ASCII tables with a concrete threshold ("4+ rows or 3+ columns"). This matches the anchor-5 example structure (what + explicit 'Use when' with concrete trigger phrases) and exceeds anchor 4, which requires only a less-explicit 'when'.

Trigger Term Quality

Triggers include natural phrases users would actually say: "diagram", "architecture overview", "diff review", "plan review", "project recap", "comparison table", "visual explanation of technical concepts". Coverage is good but misses common synonyms and variations ("visualization", "chart", "flowchart", "draw me"), so it falls between anchor 4 and anchor 5's "comprehensive coverage of natural terms including synonyms and file extensions" — clearly above anchor 3's "some relevant keywords but missing common variations".

Distinctiveness Conflict Risk

The niche (self-contained HTML visual explainers) is mostly distinct with dedicated triggers, but "diff review", "plan review", and "project recap" overlap with review/recap skills, and the proactive any-ASCII-table trigger is broad enough to fire during many other skills' output formatting. Fits anchor 4 ("Mostly distinct; minor overlap risk with closely related skills") better than anchor 5's minimal-conflict bar or anchor 3's routine overlap.