Conciseness

The body is mostly lean: scoped visual targets, terse tuning knobs, and code that earns its place, with minimal over-explanation of concepts Claude already knows; a few prose sections (Taste Rules, Avoid) restate shader behavior that the code already expresses.

Actionability

It provides complete, copy-paste-ready raw WebGL code (vertex/fragment shaders, shader/program helpers, initializer, resize loop, cleanup) plus concrete tuning knobs with default values, covering the common single-canvas case end to end.

Workflow Clarity

The setup is clearly sequenced (layer DOM -> canvas CSS -> brand color -> WebGL setup -> initializer -> tuning) with a cleanup return and reduced-motion guard, but there is no explicit validate/verify checkpoint confirming the effect renders or the canvas context was obtained beyond early returns.

Progressive Disclosure

Content is well-organized into focused sections with no bundle files to reference; the single-file structure is appropriate for this skill, though the long inline shader and initializer could arguably live in a separate script file, which keeps it just below 5.

Specificity

Names the concrete action ("Create a fixed full-screen WebGL laser background effect") plus specific visual deliverables (white-hot core, brand-colored halo, smoky fog), but stops short of listing multiple discrete operations, so it falls between the 3 and 5 anchors.

Completeness

It states clearly what the skill does (the laser effect and its visual properties) and gives explicit when-guidance ("Use only for laser background effects"), but the when-clause is framed as a restriction rather than a positive trigger scenario, keeping it just below the 5 anchor.

Trigger Term Quality

"WebGL laser background effect" and "laser background effects" are the natural phrases a user would say, and excluded terms (hero scenes, particles) sharpen intent; it lacks broader synonyms or file/extension cues that would push it to 5.

Distinctiveness Conflict Risk

The niche is highly specific (fixed full-screen WebGL laser beam) and the explicit exclusions (no full page layout, copy, hero scenes, particles, unrelated motion) sharply separate it from neighboring visual-effect skills, giving minimal conflict risk.