Lean and assumes Claude's competence — it does not explain what a canvas, dithering, or CSS is; the long code block is a complete executable recipe (the skill's actual deliverable) rather than padded explanation, and the supporting sections are terse bullet lists.

Provides copy-paste-ready HTML, CSS, and a complete JS canvas recipe with an init function, options object, resize handling, and cleanup return, plus concrete tuning ranges; fully executable rather than pseudocode.

As a single, non-destructive visual task the sequence (markup/CSS → canvas recipe → tuning → quick checks) is unambiguous, and the 'Quick Checks' section serves as an explicit verification checklist; no destructive/batch validation is required here.

No bundle files exist, so the skill is appropriately self-contained; sections are clearly labeled and there are no nested/deep references, with the inline code being the core deliverable rather than reference material that bloats an overview.

Names concrete actions and specific visual features — 'enlarged square pixels', 'Bayer-style ordered dithering', 'broad organic waves or cloud masses', 'restrained gray-white highlights' — rather than vague language; not below 2 because it goes well beyond naming only a domain.

Explicitly answers both what ('Create a dark monochrome procedural background...') and when (an explicit 'Use when a page needs...' clause), matching the anchor-3 pattern; not below 2 because the trigger guidance is explicit, not implied.

Includes natural terms a user would say ('background', 'dithering', 'dark monochrome', 'atmospheric') plus use contexts ('framed UI, hero content, or data overlays'); 'Bayer-style ordered dithering' is the genuine domain term rather than jargon-for-jargon's-sake.

Occupies a clear niche (procedural dithered backgrounds) with distinctive triggers unlikely to fire for unrelated skills; far above the anchor-1 generic 'helps with code and documents'.