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.
49
53%
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 ./tests/ext_conformance/artifacts/agents-wshobson/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 lists specific ES6+ features and includes explicit trigger guidance with a 'Use when' clause. The main weakness is potential overlap with other JavaScript-related skills, as terms like 'JavaScript', 'modern patterns', and 'functional programming' are broad enough to conflict with adjacent skills. The description is well-structured and uses appropriate third-person voice.
| 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 implementing modern patterns. | 3 / 3 |
Completeness | Clearly answers both 'what' (master ES6+ features including a detailed list of specific features and patterns) 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', '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+ specifically, terms like 'JavaScript code', 'optimizing JavaScript applications', and 'functional programming patterns' could overlap with general JavaScript skills, Node.js skills, or broader programming skills. The ES6+ focus provides some distinction but 'JavaScript' is quite broad. | 2 / 3 |
Total | 11 / 12 Passed |
Implementation
14%Reviews the quality of instructions and guidance provided to agents. Good implementation is clear, handles edge cases, and produces reliable results.
This skill reads as a comprehensive JavaScript ES6+ textbook rather than an actionable skill file for Claude. It is extremely verbose, explaining fundamental concepts Claude already knows (arrow functions, destructuring, array methods), and lacks any task-oriented workflows or validation steps. The content would benefit enormously from being condensed to only non-obvious patterns and refactoring-specific guidance, with detailed references split into separate files.
Suggestions
Reduce content by 80%+ by removing explanations of features Claude already knows (basic arrow functions, destructuring syntax, template literals, standard array methods) and focus only on non-obvious patterns, common refactoring transformations, and project-specific conventions.
Add concrete refactoring workflows with clear steps: e.g., '1. Identify callback-based async code → 2. Convert to async/await → 3. Add error handling with try/catch → 4. Verify equivalent behavior' with before/after code examples.
Split detailed reference material (class features, iterator patterns, performance utilities) into separate bundle files and reference them from a concise SKILL.md overview.
Remove the 'Best Practices', 'Common Pitfalls', and 'Resources' sections entirely — these are generic knowledge Claude already has and waste token budget.
| Dimension | Reasoning | Score |
|---|---|---|
Conciseness | Extremely verbose at ~600+ lines. Explains basic concepts Claude already knows (arrow functions, destructuring, template literals, array methods like map/filter/reduce). Reimplements built-in functions (custom forEach, map, filter) which adds no value. The 'Best Practices' and 'Common Pitfalls' sections are generic advice Claude already possesses. The 'Resources' section with external URLs is unnecessary for a skill file. | 1 / 3 |
Actionability | Code examples are executable and syntactically correct, which is good. However, the skill reads as a JavaScript textbook/reference rather than actionable guidance for specific tasks. It lacks concrete workflows like 'when you encounter X legacy pattern, refactor it to Y' with before/after examples tied to real refactoring scenarios. The examples demonstrate syntax but don't instruct Claude on when or how to apply them in context. | 2 / 3 |
Workflow Clarity | There are no multi-step workflows, no sequenced processes, and no validation checkpoints. The skill is a flat reference document organized by feature category rather than by task or workflow. For a skill about refactoring legacy code, there should be clear step-by-step processes (e.g., identify pattern → apply transformation → verify behavior). | 1 / 3 |
Progressive Disclosure | Monolithic wall of content with no references to supporting files. Everything is inlined in a single massive document. Content like detailed API patterns, class features, and performance optimization could easily be split into separate reference files. No bundle files exist to support progressive disclosure. | 1 / 3 |
Total | 5 / 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 (928 lines); consider splitting into references/ and linking | Warning |
Total | 10 / 11 Passed | |
- Repository
- Dicklesworthstone/pi_agent_rust
- Commit
b09ec7f
- Reviewed
Table of Contents
Is this your skill?
If you maintain this skill, you can claim it as your own. Once claimed, you can manage eval scenarios, bundle related skills, attach documentation or rules, and ensure cross-agent compatibility.