threejs-geometry

Three.js geometry creation - built-in shapes, BufferGeometry, custom geometry, instancing. Use when creating 3D shapes, working with vertices, building custom meshes, or optimizing with instanced rendering.

Quality

79%

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tessl review fix ./skills/threejs-geometry/SKILL.md

Quality

Content

71%Scale 1-5

Reviews the quality of instructions and guidance provided to agents. Good implementation is clear, handles edge cases, and produces reliable results.

This is a solid reference skill with excellent actionability—every section provides executable code examples covering Three.js geometry from basic shapes through advanced instancing. The main weakness is its length; the comprehensive built-in geometry catalog and detailed BufferAttribute reference inflate the token cost without proportional value, since much of this is API documentation Claude could reason about. The structure is logical but would benefit from splitting into overview + detailed reference files.

Suggestions

Move the exhaustive built-in geometry parameter listings (Basic Shapes, Advanced Shapes) into a separate GEOMETRY_REFERENCE.md file, keeping only the most common 3-4 shapes inline with brief examples.

Remove the BufferAttribute Types section—Claude already knows typed array options and item sizes; this is standard WebGL/Three.js knowledge.

Consider splitting into SKILL.md (overview + quick start + common patterns + performance tips) and BUFFERGEOMETRY.md (custom geometry, interleaved buffers, morph targets) for better progressive disclosure.

Dimension	Reasoning	Score
Conciseness	The skill is comprehensive but includes some content Claude would already know (e.g., explaining what BufferGeometry is, listing every built-in geometry with full parameter signatures that are available in docs). The BufferAttribute types section with item size comments is somewhat redundant. However, most code examples earn their place as quick-reference material.	3 / 5
Actionability	Every section provides fully executable, copy-paste ready code examples covering common and advanced use cases. The examples are concrete with specific parameter values, and cover the full range from basic shapes through instancing, morph targets, and BatchedMesh.	5 / 5
Workflow Clarity	This is primarily a reference/API skill rather than a multi-step workflow skill, so the single-task exception applies broadly. The BufferGeometry modification section correctly shows the needsUpdate flag and recomputation steps in sequence. The Performance Tips section provides clear guidance. Minor gap: no explicit validation steps for custom geometry creation (e.g., checking winding order, verifying normals).	4 / 5
Progressive Disclosure	The content is well-structured with clear section headers progressing from basic to advanced, and includes 'See Also' references to related skills. However, at ~350+ lines, the built-in geometries catalog and BufferGeometry details could be split into separate reference files. The monolithic structure makes it harder to navigate despite good headings.	3 / 5
	Total	15 / 20 Passed

Description

87%Scale 1-5

Based on the skill's description, can an agent find and select it at the right time? Clear, specific descriptions lead to better discovery.

This is a strong skill description that clearly identifies its domain (Three.js geometry), lists specific capabilities, and includes an explicit 'Use when' clause with natural trigger terms. It's concise, uses proper third-person voice, and would be easily distinguishable from other skills in a large collection.

Dimension	Reasoning	Score
Specificity	Lists several specific actions: built-in shapes, BufferGeometry, custom geometry, and instancing. These are concrete capabilities but could be slightly more detailed about what each entails.	4 / 5
Completeness	Clearly answers both 'what' (Three.js geometry creation with built-in shapes, BufferGeometry, custom geometry, instancing) and 'when' (explicit 'Use when' clause with concrete trigger phrases: creating 3D shapes, working with vertices, building custom meshes, optimizing with instanced rendering).	5 / 5
Trigger Term Quality	Includes good natural terms like '3D shapes', 'vertices', 'custom meshes', 'instanced rendering', and 'Three.js'. Missing some variations like 'geometry nodes', 'mesh generation', 'procedural geometry', or 'indexed geometry'.	4 / 5
Distinctiveness Conflict Risk	Highly distinct niche focused specifically on Three.js geometry creation. The combination of Three.js, geometry types, and specific techniques like instancing makes it clearly distinguishable from other 3D or general coding skills.	5 / 5
	Total	18 / 20 Passed

Validation

81%

Warnings & errors only

Checks the skill against the spec for correct structure and formatting. All validation checks must pass before discovery and implementation can be scored.

Validation — 9 / 11 Passed

Validation for skill structure

Criteria	Description	Result
skill_md_line_count	SKILL.md is long (581 lines); consider splitting into references/ and linking	Warning
frontmatter_unknown_keys	Unknown frontmatter key(s) found; consider removing or moving to metadata	Warning

	Total	9 / 11 Passed

Repository: administrakt0r/AI-Agents-Safe-Coding-Skills
Path: skills/threejs-geometry/SKILL.md
Commit: 7520423

Reviewed: ~7 hours ago

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