Conciseness

The body is dense and table-driven with executable code and no explanations of concepts Claude already knows, but there is minor redundancy: the ~57% WCAG statistic appears in both Overview and Limitations, the persist-JSON-and-pipe-to-gate instruction is repeated in CI integration, and pinned action versions (actions/checkout@v5) add time-sensitive detail. This fits 'efficient; minor instances that could be trimmed' better than the lean level-5 anchor.

Actionability

Guidance is fully executable and copy-paste ready: 'npm install --save-dev axe-core', complete axe.run() and AxeBuilder examples with real withTags values ('wcag2a', 'wcag2aa', 'wcag22aa'), cypress-axe usage, a full GitHub Actions workflow, and a jq triage command. Specific examples cover the common cases (Playwright, Cypress, raw API, CI), matching the level-5 anchor.

Workflow Clarity

'How to use' is a clearly sequenced 7-step workflow (install, drive page state, pin tags, narrowly suppress, persist JSON, gate via a11y-violation-gate, route incomplete to manual review), and the worked example demonstrates an explicit feedback loop: gate fails with the failing selector attributed, the button colour is fixed, and the next run reports violations: []. Checkpoints and error recovery are explicit, matching level 5.

Progressive Disclosure

The body is an overview with inline quick-start code, and detail is split into five verified, one-level-deep reference files, each clearly signaled with per-file 'reach for it when' guidance in the Other scanners table and again in References. Nothing that belongs in references is inlined, matching the level-5 anchor.

Specificity

The description lists multiple concrete actions with named tools and APIs — 'axe-core via axe.run(), @axe-core/playwright or the CLI on every PR, rule configuration and CI-gateable results, plus pa11y, Lighthouse CI accessibility, WAVE and IBM Equal Access' — covering engine, wrappers, CLI, rule config, CI gating, and alternatives comprehensively, matching the level-5 anchor rather than the minor-gaps level-4 anchor.

Completeness

It explicitly answers both questions: 'Use whenever pages or components need automated accessibility scanning' states when with concrete conditions, and the capability list states what. The when-clause is explicit with concrete triggers, so it exceeds the level-4 anchor where 'when' is only adequately specific.

Trigger Term Quality

Natural phrases like 'accessibility scanning', 'axe', 'Section 508', and 'on every PR' are present, but common synonyms users say such as 'a11y', 'WCAG', or 'axe scan' are absent, which fits the good-but-incomplete level-4 anchor rather than comprehensive synonym coverage at 5.

Distinctiveness Conflict Risk

'Automated accessibility scanning' is a clear, well-scoped niche with tool-specific triggers, but the broad term 'accessibility' and the skill's own sibling references (a11y-violation-gate, screen-reader-test-author) create minor overlap risk with closely related skills, matching level 4 rather than minimal-conflict level 5.