Conciseness

The body is lean and comment-dense with no primer material (no explanation of what three.js or loaders are); every code block carries non-obvious gotchas as terse comments (e.g. 'glTF PBR materials render black without lights or an environment'). Version-sensitive details (r179/r180/r181 renames) are confined to the deprecated-patterns 'Common Mistakes' section the rubric exempts, matching the 5 anchor 'every token earns its place'.

Actionability

Fully executable, copy-paste-ready examples cover the common cases: glTF with Draco/meshopt/KTX2, textures with color-space rules, HDR/EXR/UltraHDR environments, OBJ/FBX/STL/PLY/USD formats, SkeletonUtils cloning, disposal traversal, and WebGPU setup. Not 4: there are no gaps — even edge cases like PLY Float64 conversion come with working fixes.

Workflow Clarity

The Quick Start and async-patterns sections give a clear load→process→render sequence, and the LoadingManager section shows a real feedback loop (timeout → abort → catch → finally; error callbacks on texture loads). It sits at 4 rather than 5 because the body is organized as a topic reference rather than a checkpointed pipeline — processing and verification steps (traverse, scale-to-unit-box, Float64 conversion) are shown per-format rather than as one explicit ordered workflow.

Progressive Disclosure

Sections are well-organized with clear headers and a 'See Also' list of sibling skills, but the ~500-line body has no bundle files at all: the 17-item 'Common Mistakes' catalog and the per-format loader details (OBJ, FBX, STL, PLY, USD) are content that clearly belongs in reference files. This matches the 3 anchor ('content that should be separate is inline') rather than 4, because there are no one-level-deep reference files to signal.

Specificity

The description enumerates many concrete capabilities — 'glTF with Draco, meshopt and KTX2 compression', 'HDR and EXR environments', 'progress, caching, cloning and disposal' — with comprehensive coverage of the skill's domain. It clearly matches the 5 anchor (multiple specific concrete actions) rather than 4, which would require minor coverage gaps.

Completeness

It explicitly answers both questions: the first sentence states what the skill does, and 'Use when loading 3D models, textures or environment maps, or managing loading progress' gives concrete trigger phrases. This matches the 5 anchor's exemplar pattern; it is not 4 because the 'when' clause is fully explicit rather than merely adequate.

Trigger Term Quality

Good natural keyword coverage ('loading 3D models, textures or environment maps', 'Draco', 'meshopt', 'KTX2', 'HDR', 'EXR', 'WebGL', 'WebGPU'), but a few terms users commonly say are missing, such as 'GLB'/'.glb' file extensions, 'skybox', or 'cubemap'. This fits the 4 anchor (good coverage, a few natural terms missing); it is not 5 because synonym/extension coverage is not comprehensive.

Distinctiveness Conflict Risk

A clear niche (three.js asset loading) with distinct technical triggers (Draco, meshopt, KTX2, TSL, WebGPU) that other skills would not claim; the 'loading' qualifier separates texture-loading triggers from texture-property skills. Minimal conflict risk, matching the 5 anchor.