# Coding Practices

> Code quality practices: error handling, validation, logging, and DRY. Use when writing or reviewing code.

- Skill: `majiayu000/coding-practices` (Agent Skill, multi-file: 2 files)
- Install (CLI): `npx skillmds add majiayu000/coding-practices`
- Raw SKILL.md: https://api.skillmd.com/api/skills/majiayu000/coding-practices/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Coding & Dev Tools
- Author: majiayu000 (https://skillmd.com/u/majiayu000)
- Updated: 2026-09-09
- Page: https://skillmd.com/skills/majiayu000/coding-practices

---


---
name: coding-practices
description: Code quality practices: error handling, validation, logging, and DRY. Use when writing or reviewing code.
---

# Coding Practices

Guidelines for writing maintainable, robust, and self-documenting code.

## Quick Start

```typescript
// Self-documenting with proper error handling
function createUser(email: string, age: number): User {
  if (!email.includes("@")) throw new Error("Invalid email");
  if (age < 0 || age > 150) throw new Error("Invalid age");
  return { email, age };
}
```

## Key Principles

- Use meaningful names (self-documenting code)
- Comments explain "why", not "what"
- DRY: abstract when used 3+ times
- Validate all input data
- Handle all error cases with proper Error objects
- Never ignore errors
- Use named constants instead of magic values
- Avoid circular dependencies

## References

See [rules.md](references/rules.md) for complete guidelines with examples.