Conciseness

"You already know Nielsen's 10 heuristics and the Laws of UX. This skill sets the procedure, what to look for in this stack, and the report format" explicitly declines to re-teach known concepts, and the 13-row checks table carries dense, stack-specific signal with no padding. Every section (Scope, checks, Severity, Report format, Writing the fix) earns its tokens, matching the lean anchor-5 profile.

Actionability

Each check names the exact code that reveals it — "data-turbo-submits-with", "aria-busy", "type, required, min/max, inputmode", "44×44px", "more than about 7 top-level items" — and the report format is a copy-paste markdown template with severity counts, per-finding fields, and a fix-order section. Per the rubric's instruction-only note, the absence of executable code is not penalized when the guidance is this concrete; this is fully actionable, matching anchor 5.

Workflow Clarity

The sections form a coherent sequence — determine scope ("Ask for, or infer, what to review"), read templates/partials/controllers/CSS, run the app if a browser tool exists, work through the check table, dedupe root causes ("file it as one finding"), rate severity, report, then fix — with an explicit verification gate ("Every finding needs a file and line, or the exact screen and element. Drop findings you can't point at") and a literal checklist. The destructive/batch cap does not apply since this is a read-only review, so anchor 5 fits.

Progressive Disclosure

No bundle files exist (no references/, scripts/, or assets/), and none are needed: this is a single ~70-line procedure whose checks table is appropriately inline at this size. Sections are well-organized and the cross-skill pointers (optics-context, bem-structure) are clearly signaled in parentheses. Per the rubric's simple-skill note, a self-contained skill with well-organized sections and no need for external references scores 5.

Specificity

The description names the input stack ("Reviews UI code (Slim/HTML, CSS, Stimulus/JS)"), the evaluation frameworks ("Nielsen's 10 usability heuristics and the Laws of UX"), and the output artifact ("a ranked issue log with evidence and fixes"). It lists multiple concrete actions with comprehensive coverage of what the skill does, matching the anchor-5 example's completeness rather than the minor-gaps profile of anchor 4.

Completeness

Both halves are explicit: what ("Reviews UI code... and reports them as a ranked issue log with evidence and fixes") and when ("Use when asked for a UX review, UI review, usability audit... or when the user mentions Nielsen, heuristics, Fitts's Law, Hick's Law"). This mirrors the anchor-5 example's structure of concrete what plus concrete trigger phrases, and the 'Use when' clause is present, so no cap applies.

Trigger Term Quality

It covers natural user phrasings and their synonyms — "UX review, UI review, usability audit, heuristic evaluation, 'is this usable'" — plus the framework names a user would drop ("Nielsen, heuristics, Fitts's Law, Hick's Law, or another Law of UX") and a timing trigger ("checking a new screen or flow before it ships"). Coverage including synonyms matches anchor 5.

Distinctiveness Conflict Risk

The niche is a usability heuristic evaluation of a specific UI stack, and the triggers (Nielsen heuristics, Laws of UX, "is this usable", pre-ship screen check) are distinct from generic code-review or CSS-review requests. It presents a clear niche with minimal conflict risk, matching anchor 5.