threejs-animation
Three.js animation - keyframe animation, skeletal animation, morph targets, animation mixing. Use when animating objects, playing GLTF animations, creating procedural motion, or blending animations.
68
82%
Does it follow best practices?
Impact
—
No eval scenarios have been run
Passed
No known issues
Quality
Discovery
100%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 well-crafted skill description that clearly defines its scope within Three.js animation, lists specific capabilities, and provides explicit trigger guidance. It uses proper third-person voice and covers both common and technical terms users would naturally use. The description is concise yet comprehensive, making it easy for Claude to select appropriately.
| Dimension | Reasoning | Score |
|---|---|---|
Specificity | Lists multiple specific concrete actions: keyframe animation, skeletal animation, morph targets, animation mixing. These are distinct, well-defined capabilities within the Three.js animation domain. | 3 / 3 |
Completeness | Clearly answers both 'what' (keyframe animation, skeletal animation, morph targets, animation mixing) and 'when' with an explicit 'Use when...' clause listing four trigger scenarios. | 3 / 3 |
Trigger Term Quality | Includes strong natural keywords users would say: 'animating objects', 'GLTF animations', 'procedural motion', 'blending animations', 'keyframe', 'skeletal animation', 'morph targets'. These cover the main ways users would describe animation tasks in Three.js. | 3 / 3 |
Distinctiveness Conflict Risk | Highly distinctive with a clear niche: Three.js animation specifically. The combination of Three.js context with animation-specific terms like 'GLTF animations', 'morph targets', and 'skeletal animation' makes it unlikely to conflict with general animation or general Three.js skills. | 3 / 3 |
Total | 12 / 12 Passed |
Implementation
64%Reviews the quality of instructions and guidance provided to agents. Good implementation is clear, handles edge cases, and produces reliable results.
This is a comprehensive Three.js animation reference with excellent actionability—nearly every concept is backed by executable code examples. Its main weaknesses are length (could be more concise by trimming exhaustive listings and removing explanatory text Claude doesn't need) and the monolithic structure that would benefit from splitting advanced topics into separate files. Workflow clarity could be improved with explicit error handling and validation steps.
Suggestions
Trim the KeyframeTrack types section to show 2-3 representative examples and note the pattern, rather than listing all 6 types exhaustively.
Add error handling to the GLTF loading workflow (e.g., loader.load error callback) and include a validation step to verify animations loaded correctly before playing.
Split advanced topics (procedural animation patterns, skeletal animation, morph targets) into separate referenced files to improve progressive disclosure and reduce the main file length.
| Dimension | Reasoning | Score |
|---|---|---|
Conciseness | The skill is fairly efficient with code-heavy content, but it's quite long (~350 lines) and includes some sections that could be trimmed. The 'Animation System Overview' section explaining the three components is somewhat unnecessary for Claude. Some code examples are exhaustive where a representative subset would suffice (e.g., listing every KeyframeTrack type). | 2 / 3 |
Actionability | Excellent actionability throughout. Nearly every section contains fully executable, copy-paste ready code examples covering keyframe tracks, animation mixers, GLTF loading, skeletal animation, morph targets, blending, and procedural patterns. The code is concrete with specific property paths, method calls, and realistic usage patterns. | 3 / 3 |
Workflow Clarity | Individual API usage is clear, but multi-step workflows lack explicit validation checkpoints. For example, the GLTF loading section doesn't mention error handling for failed loads, and the animation blending setup doesn't include verification that clips loaded correctly. The overall flow from setup to animation loop is implicit rather than explicitly sequenced. | 2 / 3 |
Progressive Disclosure | The content is well-organized with clear section headers and a logical progression from simple to complex. However, it's a monolithic document (~350 lines) where sections like procedural animation patterns, skeletal animation details, or morph targets could be split into referenced files. The 'See Also' section at the end provides cross-references to related skills, which is good but the main content itself could benefit from splitting. | 2 / 3 |
Total | 9 / 12 Passed |
Validation
90%Checks the skill against the spec for correct structure and formatting. All validation checks must pass before discovery and implementation can be scored.
Validation — 10 / 11 Passed
Validation for skill structure
| Criteria | Description | Result |
|---|---|---|
skill_md_line_count | SKILL.md is long (553 lines); consider splitting into references/ and linking | Warning |
Total | 10 / 11 Passed | |
- Repository
- CloudAI-X/threejs-skills
- Commit
b1c6230
- Reviewed
Table of Contents
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