# Backend Quality Debugging

> Debugging tools, logging, error tracking.

- Skill: `valec3/backend-quality-debugging` (Agent Skill)
- Install (CLI): `npx skillmds@latest add valec3/backend-quality-debugging`
- Raw SKILL.md: https://api.skillmd.com/api/skills/valec3/backend-quality-debugging/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: AI & ML
- Author: valec3 (https://skillmd.com/u/valec3)
- Updated: 2026-09-10
- Page: https://skillmd.com/skills/valec3/backend-quality-debugging

---


# Backend Quality Debugging

## When to use this skill
- Troubleshooting bugs
- Production issues
- Performance problems
- Error tracking

## Workflow
- [ ] Enable debug mode (dev only)
- [ ] Use logging
- [ ] Check query execution
- [ ] Use Kint for variables
- [ ] Track errors

## Instructions

### Logging
```php
<?php

log_message('error', 'User not found: ' . $userId);
log_message('debug', 'Processing order: ' . $orderId);
log_message('info', 'Email sent to: ' . $email);
```

### Debug Toolbar
```php
<?php

// Config/Boot/development.php
Services::toolbar()->respond();
```

### Variable Debugging
```php
<?php

d($variable);    // Dump
dd($variable);   // Dump and die
```

### Query Debugging
```php
<?php

$db = \Config\Database::connect();
echo $db->getLastQuery();
```

## Resources
- Log errors and important events
- Use debug toolbar in dev
- Never show errors in production