Conciseness

All content is codebase-specific (no generic PDF-style concept explanations), but the three ~200-word incident narratives ("Real, recent example: a presence-page Prev/Next pager was first built with custom <button class="btn btn-xs"> elements...") each restate the same grep-first moral that also appears again in the checklist ("Grep front/js/, front/css/, front/php/ for an existing implementation"). More than minor over-explanation that could be trimmed, but every paragraph carries real file/function facts.

Actionability

Fully executable guidance throughout: copy-paste greps ("grep -rn 'pagination\|paginate_button' front/", "grep -rn '\.DataTable(' front/"), exact function names (resolveSpinnerTarget(), callAfterAppInitialized(), getStatusBadgeParts()), file paths, concrete markup patterns ("<span class="badge ${cssClass}">${iconHtml} ${label}</span>"), and a specific API prescription ("Use .finally(hideSkeleton) on the render promise, not .then(hideSkeleton)").

Workflow Clarity

The numbered "Practical checklist before building a new UI element" gives a clear sequence (grep -> reuse -> PRD check -> design via priority order -> "Verify visually in a real browser/devcontainer before calling it done") with an explicit validation checkpoint. Not 5 because there is no feedback loop for what to do when verification fails; not 3 because a concrete checkpoint is present and the sequence is well-defined.

Progressive Disclosure

Six clearly headed sections in a single SKILL.md with no bundle files, and in-text references point at real project paths (front/js/common.js, front/js/app-init.js, front/css/dark-patch.css) rather than nonexistent skill files. Not 5 because the three long example narratives are inlined content that could be split into a one-level-deep references file, leaving the main file as rules + checklist; not 3 because structure and navigation are good, not buried or monolithic.

Specificity

Lists several concrete coverage items - "a control, layout, button, or interaction pattern", "the don't-invent-new-UX-without-a-PRD rule", and "the priority order for design tradeoffs" with all eight levels spelled out. Not 5 because it scopes via examples and rules rather than comprehensively covering what the body teaches (skeleton/spinner mechanics, fetch-once/filter-client-side are absent); not 3 because it names well more than 1-2 concrete things.

Completeness

Explicitly answers both parts: when - "Read before adding or changing any front/ UI element - a control, layout, button, or interaction pattern"; what - "Covers the don't-invent-new-UX-without-a-PRD rule and the priority order for design tradeoffs". Not 4 because the 'when' is specific and concrete with trigger phrases, not merely present-but-imprecise.

Trigger Term Quality

Natural phrases users would say: "adding or changing any front/ UI element", "a control, layout, button", "interaction pattern", "design tradeoffs". Not 5 because common variations like "design", "style", "CSS", "modal", or "form" are missing; not 3 because coverage is good and specific rather than partial.

Distinctiveness Conflict Risk

Clear niche with distinct triggers: a codebase-specific UX reuse rule set (front/ UI elements, PRD gating, an explicit 8-level priority chain) that no generic skill would claim. Minimal conflict risk with other skills; not 4 because there is no meaningful overlap with a neighboring skill's triggers.