The body is lean and assumes Claude's competence — it does not re-explain browsers, MCP, or accessibility trees, and each section (cache-busting, ephemeral ids, overlay interception) earns its place rather than padding.

Provides fully executable JS snippets (getComputedStyle comparisons, classList toggle) and specific tool invocations (browser_press_key Escape, cache-busted URL, location.reload(true)), copy-paste ready rather than pseudocode.

The numbered Validation loop (Navigate → Snapshot → Console → Screenshot → Report) is cheap-to-expensive with explicit validation checkpoints ('assert 0 errors', 'Confirm the expected heading... before screenshotting') and a clear stop condition.

No bundle files exist and none are needed; the single self-contained file is organized into clear, well-signaled sections with no nested references, satisfying the rubric's allowance for skills with no need for external references.

Lists multiple concrete actions — navigate pages, assert headings/text/status, check console errors, hover/click, take screenshots, read computed styles — matching the anchor for listing several specific actions rather than naming a domain only.

Explicitly answers both what (concrete validation actions) and when (USE FOR triggers plus DO NOT USE FOR boundaries and INVOKES tools), so both clauses are present and explicit.

The 'USE FOR' clause supplies natural phrasings a user would say ('validate with Playwright', 'open the browser and check', 'confirming a CSS/SVG/icon edit rendered', 'comparing light/dark mode'), giving good coverage of common variations.

The DO NOT USE FOR clause explicitly disambiguates from sibling skills (agui-dojo for E2E tests, agui-dotnet-sdk-docs for .NET docs), carving a clear niche unlikely to trigger the wrong skill.