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 description that clearly lists specific ES6+ features and provides explicit trigger guidance via a 'Use when...' clause. Its main weakness is potential overlap with other JavaScript-related skills due to the broad scope of 'optimizing JavaScript applications' and general JavaScript coding. The description uses proper third-person voice and avoids fluff.
Suggestions
Narrow the scope or add boundary language to reduce conflict risk with general JavaScript skills, e.g., 'Use when specifically working with ES6+ syntax and modern JavaScript patterns, not for general JS debugging or framework-specific tasks.'
| 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', '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+ and modern JavaScript specifically, the broad scope ('JavaScript code', 'optimizing JavaScript applications') could overlap with general JavaScript coding skills, Node.js skills, or frontend development skills. The term 'Master' at the start is also somewhat vague. However, the ES6+ focus and specific feature list provide some distinctiveness. | 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+ textbook or cheat sheet rather than an actionable skill for Claude. It extensively documents language features Claude already knows well, consuming significant token budget without adding novel value. The lack of any workflow, decision framework, or task-oriented structure means it fails to guide Claude through the stated use cases like refactoring legacy code or migrating from callbacks.
Suggestions
Remove basic syntax demonstrations (arrow functions, destructuring, template literals, etc.) that Claude already knows — focus only on project-specific conventions, gotchas, or non-obvious patterns.
Add concrete workflows for the stated use cases, e.g., a step-by-step process for 'refactoring legacy callback code to async/await' with before/after examples and validation steps.
Replace the generic 'Best Practices' list with a concise decision table or flowchart (e.g., 'When to use Promise.all vs Promise.allSettled vs for...of await').
Reduce the main file to a brief overview with pointers to topic-specific reference files, rather than inlining hundreds of lines of basic examples.
| 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, they demonstrate standard language features rather than providing actionable guidance for specific tasks. There's no concrete workflow for refactoring legacy code or implementing specific patterns — it reads more like a reference manual than an instruction set. | 2 / 3 |
Workflow Clarity | There is no clear workflow or sequenced process. The skill is structured as a feature catalog rather than a guide for accomplishing tasks. No validation checkpoints, no decision trees for when to use which pattern, and no step-by-step processes for the stated use cases like 'migrating from callbacks to async/await'. | 1 / 3 |
Progressive Disclosure | The skill does reference advanced-patterns.md for several topics, which is good progressive disclosure. However, the main file itself is still a wall of basic content that should have been trimmed rather than split. The inline content is too long for an overview, and the references are all to a single file rather than topic-specific files. | 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
91fe43e
- Reviewed
Table of Contents
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