Individual skill
find-boundary-issues
Detects boundary issues in PHP code. Finds array index out of bounds, empty collection access, off-by-one errors, integer overflow, string length issues.
skills/find-boundary-issues/SKILL.md
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# Boundary Issue Detection
Analyze PHP code for boundary and range violations.
## Detection Patterns
### 1. Array Index Out of Bounds
```php
// BUG: No bounds check
$items = [1, 2, 3];
$last = $items[count($items)]; // Off by one, should be count - 1
// BUG: Hardcoded index