# Drupal Debugging

> Drupal debugging techniques — Devel module, Drush watchdog, Twig debug, XDebug, error logging, and common troubleshooting patterns.

- **Type:** Skill
- **Install:** `agentstack add skill-edutrul-drupal-ai-drupal-debugging`
- **Verified:** Yes — security-reviewed for prompt injection and unsafe behavior
- **Seller:** [edutrul](https://agentstack.voostack.com/s/edutrul)
- **Installs:** 0
- **Category:** [Agent Skills](https://agentstack.voostack.com/c/agent-skills)
- **Latest version:** 0.1.0
- **License:** MIT
- **Upstream author:** [edutrul](https://github.com/edutrul)
- **Source:** https://github.com/edutrul/drupal-ai/tree/main/.claude/skills/drupal-debugging
- **Website:** https://eduardotelaya.com/drupal-ai/

## Install

```sh
agentstack add skill-edutrul-drupal-ai-drupal-debugging
```

Requires the [AgentStack CLI](https://agentstack.voostack.com/docs/cli). Works with Claude Code, Cursor, and any MCP-compatible agent.

## About

# Drupal Debugging

## Drush Log Watching

```bash
# Watch all errors
ddev drush ws --severity=error

# Last 20 entries
ddev drush ws --severity=error --count=20

# Watch all log levels
ddev drush ws --count=50

# Specific type
ddev drush ws --type=php --count=20
```

## PHP Inline Debugging

```bash
# Run PHP in Drupal context
ddev drush php:eval "var_dump(\Drupal::config('my_module.settings')->getRawData());"

# Check if service exists
ddev drush php:eval "var_dump(\Drupal::hasService('my_module.my_service'));"

# Check class autoloading
ddev drush php:eval "class_exists('Drupal\my_module\Service\MyService') ? print 'Found' : print 'Not found';"

# Inspect an entity
ddev drush php:eval "
\$node = \Drupal::entityTypeManager()->getStorage('node')->load(1);
print_r(\$node->toArray());
"
```

## Twig Debugging

Enable in `sites/default/services.yml`:
```yaml
parameters:
  twig.config:
    debug: true
    auto_reload: true
    cache: false
```

Then in templates:
```twig
{{ dump(content) }}
{{ dump(node) }}
{{ dump(_context|keys) }}
```

HTML comments in source will show template suggestions:
```html

```

## Devel Module

```bash
# Install devel
composer require drupal/devel
ddev drush en devel -y
```

In PHP:
```php
// Dump and die
dpm($variable);        // Krumo output in message area
ksm($variable);        // Krumo output (devel module)
dvm($variable);        // Var dump

// Krumo (in Twig via Devel)
// {{ devel_dump(node) }}
```

## Cache Debugging

```bash
# Clear all caches
ddev drush cr

# Rebuild theme registry only
ddev drush php:eval "\Drupal::service('theme.registry')->reset();"

# Check cache hit for a page (Drupal page cache)
# Look for X-Drupal-Cache: HIT in response headers
curl -I https://my-project.ddev.site/

# Check Big Pipe and render cache
ddev drush state:get drupal.maintenance_mode
```

## Service Container Debugging

```bash
# List all services matching a pattern
ddev drush devel:services | grep my_module

# List all services
ddev drush devel:services

# Check container definition
ddev drush php:eval "
\$def = \Drupal::getContainer()->getDefinition('my_module.my_service');
var_dump(\$def);
"
```

## Module/Hook Debugging

```bash
# List all enabled modules
ddev drush pm:list --status=enabled

# Check which modules implement a hook
ddev drush php:eval "
\$modules = \Drupal::moduleHandler()->getImplementations('form_alter');
print implode(', ', \$modules);
"

# Check module info
ddev drush pm:info my_module
```

## Common Problems and Solutions

| Problem | Solution |
|---|---|
| Class not found | Check namespace, PSR-4 in .info.yml, run `composer dump-autoload` |
| Service not found | Check services.yml syntax, run `ddev drush cr` |
| Template not used | Enable Twig debug, check template suggestions in HTML comments |
| Hook not firing | Check class is registered in services.yml, verify Hook attribute |
| Config not saving | Check config schema exists in `config/schema/` |
| Migration failing | `ddev drush ws` for details, check field mappings |

## XDebug with DDEV

```bash
# Enable XDebug
ddev xdebug on

# Disable XDebug (performance)
ddev xdebug off

# Check XDebug status
ddev xdebug status
```

Configure IDE (PHPStorm) to listen on port 9003.

## Source & license

This open-source skill is cataloged on AgentStack and links to its original source — we do not rehost the code.

- **Author:** [edutrul](https://github.com/edutrul)
- **Source:** [edutrul/drupal-ai](https://github.com/edutrul/drupal-ai)
- **License:** MIT
- **Homepage:** https://eduardotelaya.com/drupal-ai/

Install and usage instructions live in the source repository linked above.

## Pricing

- **Free** — Free

## Security capabilities

Automated source analysis of v0.1.0 — what this tool can access:

- **Network access:** yes
- **Filesystem access:** no
- **Shell / process execution:** no
- **Environment & secrets:** no
- **Dynamic code execution:** no

*"Yes" means the capability is present in the source — more access means more to trust, not that it is unsafe.*


## Versions

- **0.1.0** — security scan: passed — Imported from the upstream source.

## Links

- Listing page: https://agentstack.voostack.com/l/skill-edutrul-drupal-ai-drupal-debugging
- Seller: https://agentstack.voostack.com/s/edutrul
- Browse the marketplace: https://agentstack.voostack.com/browse

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