Lean and efficient throughout — copy-paste console snippets, crisp pass-criteria bullets, a comparison table, and failure patterns, with no padding explaining concepts Claude already knows (Lighthouse, WCAG, viewport widths).

Fully executable JavaScript snippets with exact thresholds (title 30-60 chars, LCP under 2.5s, contrast 4.5:1), named viewports, and named security headers — copy-paste ready rather than abstract direction.

A clearly sequenced 6-step Workflow with tier-specific add-ons and an explicit checkpoint ('If any of these fail, do not proceed with deeper testing until the smoke issue is fixed'), plus a fix-or-file feedback loop for failures.

SKILL.md is a well-organized overview that externalizes the report template to a single one-level-deep reference (references/qa-report-template.md), which exists and is clearly linked in three places.

Lists multiple concrete actions across three named depth tiers — 'Run QA testing on a page, feature, or full site at one of three depth tiers (smoke, standard, full)' — with specific verbs (test, audit, check, verify) rather than vague language.

Explicitly answers both what ('Run QA testing...') and when ('Use this skill whenever the user asks to test... Triggers on...'), matching the rubric's top anchor with an explicit 'Use when' clause.

Strong coverage of natural user phrasing: 'test, QA, audit, verify, check, is it working, does it look right, broken, 404, image not loading, post-deploy check, regression test' — terms a user would actually say.

Carves a clear QA niche and explicitly disambiguates from sibling specialists ('faster than accessibility-audit... performance-optimization'), making wrong-skill conflicts unlikely despite the broad proactive-trigger clause.