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.
65
57%
Does it follow best practices?
Impact
Pending
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, as the scope is fairly broad covering nearly all modern JS features. The description could benefit from slightly sharper boundaries to reduce conflict risk with general JavaScript or Node.js skills.
| 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' (Use when refactoring legacy code, implementing modern patterns, or optimizing JavaScript applications). The explicit 'Use when...' clause is present with clear triggers. | 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', 'JavaScript', 'refactoring legacy code', 'modern patterns'. These cover a wide range of terms a developer would naturally use. | 3 / 3 |
Distinctiveness Conflict Risk | While it focuses on ES6+ and modern JavaScript specifically, terms like 'JavaScript code', 'optimizing JavaScript applications', and 'functional programming patterns' could overlap with general JavaScript coding skills, Node.js skills, or broader programming skills. The ES6+ focus provides some distinction but JavaScript is a broad domain. | 2 / 3 |
Total | 11 / 12 Passed |
Implementation
22%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 JavaScript ES6+ tutorial rather than actionable guidance for Claude. It extensively explains concepts Claude already knows (arrow functions, destructuring, template literals) with textbook examples, wasting significant token budget. The skill lacks workflows for its stated purposes (refactoring, migration, optimization) and would benefit from being restructured as a concise reference with specific transformation patterns rather than a feature catalog.
Suggestions
Remove all basic syntax explanations (arrow functions, destructuring, spread, template literals, etc.) — Claude already knows these. Replace with a brief cheat-sheet table at most.
Add concrete refactoring workflows: e.g., 'Legacy callback → async/await migration' with before/after examples and step-by-step process including validation.
Replace the 15-item best practices list with a focused decision tree or pattern-matching guide that helps Claude choose the right pattern for specific situations.
Move remaining reference-style content to the advanced-patterns.md file and keep SKILL.md as a lean overview (~50 lines) with clear pointers to detailed references.
| Dimension | Reasoning | Score |
|---|---|---|
Conciseness | Extremely verbose — explains basic JS concepts Claude already knows (arrow functions, destructuring, template literals, spread operators). Most examples are textbook-level demonstrations that add no novel information. The 'When to Use This Skill' section and extensive basic syntax examples are unnecessary padding. | 1 / 3 |
Actionability | Code examples are executable and copy-paste ready, which is good. However, the skill reads more like a JavaScript tutorial/reference than actionable guidance for specific tasks. It describes features rather than instructing Claude on when/how to apply them in context (e.g., refactoring patterns, migration steps). | 2 / 3 |
Workflow Clarity | There are no workflows, sequences, or validation checkpoints. The skill is a feature catalog, not a process guide. For a skill about 'refactoring legacy code' and 'migrating from callbacks to Promises/async-await,' there should be clear step-by-step workflows with before/after examples and validation steps. | 1 / 3 |
Progressive Disclosure | The skill does reference 'references/advanced-patterns.md' for advanced topics, which is good progressive disclosure. However, the main file itself is a monolithic wall of basic examples that should have been drastically trimmed, with the inline content being far too long for an overview document. | 2 / 3 |
Total | 6 / 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
27a7ed9
- Reviewed
Table of Contents
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