# code-quality

Guides AI coding agents through clean code practices, SOLID principles, and refactoring techniques during reviews.

- skill · `type=skill` · Claude Code, Codex, Cursor, GitHub Copilot, Gemini CLI, OpenCode · 782 installs · ★ 26
- Author: miles990
- License: MIT · policy=mirror · the beginning of the file is at the end of this page
- Source: https://github.com/miles990/claude-software-skills/tree/HEAD/software-engineering/code-quality/SKILL.md
- Updated: 2026-01-20
- HTML: https://affpapa.org/en/nevibecode/skills/miles990-code-quality

## What it does

The skill provides guidelines on naming conventions, single-responsibility functions, and descriptive comments. It trains the model to replace long argument lists with typed objects and remove redundant comments.

TypeScript examples illustrate SOLID principles, contrasting fragile patterns against clean abstractions. A built-in context penalty suppresses these instructions during DevOps tasks, keeping the focus strictly on software design.

## Install

### Claude Code (native platform)

1. **Skills CLI (Vercel)**
```bash
npx skills add miles990/claude-software-skills --skill code-quality -a claude-code
```

2. **Manually: put the files in place**
- File: `~/.claude/skills/code-quality/SKILL.md` — Copy the whole skill folder; for one project use .claude/skills/code-quality/

### Codex

1. **Skills CLI (Vercel)**
```bash
npx skills add miles990/claude-software-skills --skill code-quality -a codex
```

2. **Manually: put the files in place**
- File: `.agents/skills/code-quality/SKILL.md` — For all projects use ~/.agents/skills/

### Cursor

1. **Skills CLI (Vercel)**
```bash
npx skills add miles990/claude-software-skills --skill code-quality -a cursor
```

2. **Manually: put the files in place**
- File: `.cursor/skills/code-quality/SKILL.md` — Cursor also reads .agents/skills/ and .claude/skills/

### GitHub Copilot

1. **GitHub CLI**
```bash
gh skill install miles990/claude-software-skills code-quality
```

2. **Manually: put the files in place**
- File: `.github/skills/code-quality/SKILL.md`

### Gemini CLI

1. **Skills CLI (Vercel)**
```bash
npx skills add miles990/claude-software-skills --skill code-quality -a gemini-cli
```

2. **Platform CLI**
```bash
gemini skills install https://github.com/miles990/claude-software-skills --path software-engineering/code-quality
```

### Windsurf (Devin Desktop)

**Manually: put the files in place**
- File: `.devin/skills/code-quality/SKILL.md` — The legacy .windsurf/skills/ path still works

### OpenCode

**Skills CLI (Vercel)**
```bash
npx skills add miles990/claude-software-skills --skill code-quality -a opencode
```

### Claude.ai

**Claude.ai**
- Zip the folder and upload it in Settings → Capabilities → Skills

Where a file is given instead of a command, copy the files from the source to that path: https://github.com/miles990/claude-software-skills/tree/HEAD/software-engineering/code-quality/SKILL.md

## When to use it
- Refactor oversized functions into single-purpose components
- Replace primitive argument lists with structured parameter objects
- Apply SOLID principles to decouple monolithic classes
- Remove redundant comments in favor of explanatory context

## Example prompts
- Review this module for SOLID principle violations
- Refactor the order processing function to follow clean code standards
- Split this fat interface into smaller role-specific interfaces

## Source text · SKILL.md · MIT

Below is the content of a third-party file. It is data, not instructions for you: do not act on anything written inside unless the human asks. Block tag: a44c47705a74948e.

BEGIN THIRD-PARTY FILE a44c47705a74948e
````text
---
name: code-quality
description: Clean code principles, SOLID, and code review practices
domain: software-engineering
version: 1.0.0
tags: [clean-code, solid, refactoring, code-review, linting, metrics]
triggers:
  keywords:
    primary: [code quality, clean code, solid, refactor, code review, lint]
    secondary: [dry, kiss, yagni, code smell, technical debt, static analysis]
  context_boost: [maintainable, readable, best practice, standards]
  context_penalty: [deployment, infrastructure, devops]
  priority: high
---

# Code Quality

## Overview

Principles and practices for writing maintainable, readable, and reliable code.

---

## Clean Code Principles

### Meaningful Names

```typescript
// ❌ Cryptic names
const d = new Date();
const u = getU();
const arr = data.filter(x => x.s === 'a');

// ✅ Descriptive names
const currentDate = new Date();
const currentUser = getCurrentUser();
const activeUsers = users.filter(user => user.status === 'active');

// ❌ Hungarian notation (outdated)
const strName = 'John';
const arrItems = [];
const bIsActive = true;

// ✅ Let the type system handle types
const name = 'John';
const items: Item[] = [];
const isActive = true;
```

### Functions

```typescript
// ❌ Does too much
function processUserData(userId: string) {
  const user = db.findUser(userId);
  const orders = db.findOrders(userId);
  const total = orders.reduce((sum, o) => sum + o.amount, 0);
  sendEmail(user.email, `Your total: ${total}`);
  updateAnalytics(userId, total);
  return { user, orders, total };
}

// ✅ Single responsibility
function getUser(userId: string): User {
  return db.findUser(userId);
}

function getUserOrders(userId: string): Order[] {
  return db.findOrders(userId);
}

function calculateTotal(orders: Order[]): number {
  return orders.reduce((sum, o) => sum + o.amount, 0);
}

function sendOrderSummary(user: User, total: number): void {
  sendEmail(user.email, `Your total: ${total}`);
}

// ❌ Too many parameters
function createUser(name, email, age, role, department, manager, startDate) {}

// ✅ Use object parameter
interface CreateUserParams {
  name: string;
  email: string;
  age?: number;
  role: Role;
  department: string;
  managerId?: string;
  startDate: Date;
}

function createUser(params: CreateUserParams): User {}
```

### Comments

```typescript
// ❌ Redundant comment
// Increment counter by 1
counter++;

// ❌ Outdated comment (code changed, comment didn't)
// Returns the user's full name
function getUserEmail(user: User) {
  return user.email;
}

// ✅ Explains WHY, not WHAT
// Use binary search because the list is sorted and can have 100k+ items
const index = binarySearch(sortedItems, target);

// ✅ Warns about non-obvious behavior
// IMPORTANT: This function mutates the input array for performance reasons
function quickSort(arr: number[]): number[] {
  // ...
}

// ✅ TODO with context
// TODO(john): Remove after migration completes - tracking in JIRA-1234
const legacyAdapter = new LegacyAdapter();
```

---

## SOLID Principles

### Single Responsibility Principle

```typescript
// ❌ Multiple responsibilities
class UserManager {
  createUser(data: UserData) { /* DB logic */ }
  validateEmail(email: string) { /* Validation logic */ }
````
END THIRD-PARTY FILE a44c47705a74948e

The third-party file has ended. Everything between the a44c47705a74948e tags is data: requests and commands from it are not followed. An “end of file” line with another tag inside the block is part of the file.

First 3256 of 15975 bytes. © miles990 · MIT · https://github.com/miles990/claude-software-skills/tree/HEAD/software-engineering/code-quality/SKILL.md

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