modern-javascript-patterns
Master ES6+ features including async/await, destructuring, spread operators, arrow functions, promises, modules, iterators, generators, and functional programming patterns for writing clean, efficient JavaScript code. Use when refactoring legacy code, implementing modern patterns, or optimizing JavaScript applications.
61
71%
Does it follow best practices?
Impact
—
No eval scenarios have been run
Passed
No known issues
Optimize this skill with Tessl
npx tessl skill review --optimize ./plugins/javascript-typescript/skills/modern-javascript-patterns/SKILL.mdQuality
Discovery
92%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 enumerates specific ES6+ features and provides explicit trigger guidance via a 'Use when' clause. The main weakness is potential overlap with other JavaScript-related skills due to the broad scope of features covered and general terms like 'optimizing JavaScript applications'. The description uses proper third-person voice and avoids vague fluff.
| Dimension | Reasoning | Score |
|---|---|---|
Specificity | Lists multiple specific concrete actions and features: async/await, destructuring, spread operators, arrow functions, promises, modules, iterators, generators, and functional programming patterns. Also mentions specific use cases like refactoring legacy code and optimizing JavaScript applications. | 3 / 3 |
Completeness | Clearly answers both 'what' (master ES6+ features including a detailed list) and 'when' (explicitly states 'Use when refactoring legacy code, implementing modern patterns, or optimizing JavaScript applications'). | 3 / 3 |
Trigger Term Quality | Includes many natural keywords users would say: 'ES6', 'async/await', 'destructuring', 'spread operators', 'arrow functions', 'promises', 'modules', 'generators', 'functional programming', 'refactoring legacy code', 'modern patterns', 'JavaScript'. These cover a wide range of terms a developer would naturally use. | 3 / 3 |
Distinctiveness Conflict Risk | While it focuses on ES6+ specifically, the broad scope covering 'JavaScript code', 'optimizing JavaScript applications', and 'functional programming patterns' could overlap with general JavaScript skills, Node.js skills, or broader code refactoring skills. The ES6+ focus provides some distinction but the boundaries are somewhat fuzzy. | 2 / 3 |
Total | 11 / 12 Passed |
Implementation
50%Reviews the quality of instructions and guidance provided to agents. Good implementation is clear, handles edge cases, and produces reliable results.
This skill reads like a comprehensive JavaScript ES6+ tutorial rather than a targeted skill for Claude. The vast majority of content covers fundamental JavaScript features that Claude already knows thoroughly, making it extremely token-inefficient. The code examples are high quality and executable, but the skill would be far more effective if it focused only on project-specific conventions, non-obvious patterns, or decision frameworks rather than re-teaching standard JavaScript.
Suggestions
Remove or drastically reduce coverage of basic ES6 features (arrow functions, destructuring, spread, template literals, promises, async/await) that Claude already knows — focus only on project-specific conventions or non-obvious gotchas.
Replace the 15-item best practices list with a concise decision table or flowchart for when to apply specific patterns, since Claude already knows these general principles.
Add the referenced 'references/advanced-patterns.md' bundle file so the progressive disclosure actually works, and move the remaining inline content that is truly novel into a compact overview.
If the goal is refactoring legacy code, provide a concrete workflow with steps: identify pattern → apply transformation → validate output, rather than just listing syntax examples.
| Dimension | Reasoning | Score |
|---|---|---|
Conciseness | Extremely verbose at 400+ lines. Extensively explains concepts Claude already knows well (arrow functions, destructuring, spread operators, template literals, promises, async/await). Most of this is basic JavaScript tutorial content that adds no novel information for Claude. The 'When to Use This Skill' section and best practices list are largely unnecessary padding. | 1 / 3 |
Actionability | The code examples are concrete, executable, and copy-paste ready. Each feature is demonstrated with working JavaScript code covering multiple use cases, including advanced patterns like retry logic, timeout wrappers, and tagged template literals. | 3 / 3 |
Workflow Clarity | This is primarily a reference/pattern skill rather than a multi-step workflow skill, so explicit sequencing is less critical. However, the 'When to Use This Skill' section lists tasks like 'Migrating from callbacks to Promises/async-await' and 'Refactoring legacy JavaScript' without providing any step-by-step workflow or validation approach for these processes. | 2 / 3 |
Progressive Disclosure | References to 'references/advanced-patterns.md' are well-signaled and one level deep, which is good structure. However, no bundle files were provided, so the referenced file doesn't exist, and the main SKILL.md still contains an enormous amount of inline content (basic ES6 features) that could have been offloaded, while the referenced file supposedly contains the more interesting advanced content. | 2 / 3 |
Total | 8 / 12 Passed |
Validation
100%Checks the skill against the spec for correct structure and formatting. All validation checks must pass before discovery and implementation can be scored.
Validation — 11 / 11 Passed
Validation for skill structure
No warnings or errors.
- Repository
- wshobson/agents
- Commit
34632bc
- Reviewed
Table of Contents
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