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.
73
67%
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 ./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 description that clearly lists specific ES6+ features and provides explicit trigger guidance with a 'Use when' clause. The main weakness is potential overlap with other JavaScript-related skills due to the broad scope of 'optimizing JavaScript applications.' The description uses appropriate third-person voice and avoids 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 implementing modern patterns. | 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', '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, the broad scope of 'JavaScript code' and 'optimizing JavaScript applications' could overlap with general JavaScript skills, Node.js skills, or frontend development skills. The term 'Master' is also somewhat vague as a verb. However, the ES6+ focus and specific feature list provide some distinctiveness. | 2 / 3 |
Total | 11 / 12 Passed |
Implementation
42%Reviews the quality of instructions and guidance provided to agents. Good implementation is clear, handles edge cases, and produces reliable results.
This skill is essentially a comprehensive JavaScript reference manual dumped into a single file. While the code examples are high-quality and executable, the content massively over-explains concepts Claude already knows (basic syntax, standard array methods, class inheritance) and fails to organize content across files. The skill would be far more effective as a lean overview pointing to focused sub-documents for each major topic area.
Suggestions
Reduce the SKILL.md to a concise overview (~50-80 lines) covering only non-obvious patterns and gotchas, moving detailed examples into separate reference files (e.g., ASYNC_PATTERNS.md, FUNCTIONAL.md, MODERN_OPERATORS.md)
Remove explanations of basic features Claude already knows (arrow function syntax, basic destructuring, template literals, standard array methods) and focus on project-specific conventions or non-obvious patterns
Remove the custom implementations of forEach/map/filter and the 'Best Practices' list of obvious advice (use const, use meaningful names, keep functions small) as these waste tokens on knowledge Claude already has
Add a workflow section for the stated use case of 'refactoring legacy code' with concrete sequenced steps and validation checkpoints (e.g., run tests before/after, check for this-binding issues, verify async error handling)
| 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). Re-implements built-in higher-order functions (custom forEach, map, filter) which adds no value. The 'When to Use This Skill' section and 'Best Practices' list are largely obvious guidance. Nearly every section could be cut by 70%+ without losing actionable information. | 1 / 3 |
Actionability | All code examples are concrete, executable JavaScript with clear inputs and outputs. Patterns like debounce, throttle, memoize, retry logic, and composition are copy-paste ready with practical demonstrations. | 3 / 3 |
Workflow Clarity | This is primarily a reference/pattern catalog rather than a multi-step workflow skill, so workflow clarity 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 sequenced workflow or validation steps for those processes. The content is organized by feature category but lacks guidance on how to approach refactoring tasks systematically. | 2 / 3 |
Progressive Disclosure | Monolithic wall of text with no references to external files. All content is inline despite being far too long for a single SKILL.md. Topics like async patterns, functional programming, classes, and iterators could each be separate reference files linked from a concise overview. The Resources section at the end links to external websites but doesn't organize the skill's own content across files. | 1 / 3 |
Total | 7 / 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
47823e3
- 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.