bug-detector
Detects bugs, logic errors, and edge case handling issues in code. Use when reviewing code for runtime errors, null/undefined handling, type errors, and edge cases. Returns structured bug reports with file paths, line numbers, and suggested fixes.
What this skill does
# Bug Detector Skill
## Instructions
1. Analyze code for potential bugs and logic errors
2. Check for null/undefined handling
3. Identify edge cases that aren't handled
4. Look for type errors and runtime exceptions
5. Check for off-by-one errors
6. Identify race conditions (if applicable)
7. Return structured bug reports with:
- File path and line numbers
- Description of the bug
- Current problematic code
- Suggested fix with code example
- Reason why it's a bug
- Priority (Must-Fix, Should-Fix, Nice-to-Have)
## Examples
**Input:** JavaScript function without null check
**Output:**
```markdown
### BUG-001
- **File**: `utils.js`
- **Lines**: 15-18
- **Priority**: Must-Fix
- **Issue**: Function will crash if items parameter is null or undefined
- **Current Code**:
```javascript
function calculateTotal(items) {
return items.reduce((sum, item) => sum + item.price, 0);
}
```
- **Suggested Fix**:
```javascript
function calculateTotal(items) {
if (!items || !Array.isArray(items)) {
return 0;
}
return items.reduce((sum, item) => sum + item.price, 0);
}
```
- **Reason**: Calling reduce on null/undefined will throw TypeError
```
## Bug Types to Detect
- **Null/Undefined Errors**: Missing null checks before operations
- **Type Errors**: Wrong data types used in operations
- **Logic Errors**: Incorrect algorithm implementation
- **Edge Cases**: Unhandled boundary conditions
- **Off-by-One Errors**: Array/index boundary mistakes
- **Race Conditions**: Concurrent access issues (if applicable)
- **Division by Zero**: Missing zero checks
- **Array/Collection Errors**: Accessing invalid indices
- **Missing Return Values**: Functions that should return but don't
- **Incorrect Comparisons**: Wrong comparison operators
## Priority Guidelines
- **Must-Fix**: Bugs that cause crashes or incorrect behavior
- **Should-Fix**: Bugs that cause minor issues or unexpected behavior
- **Nice-to-Have**: Potential issues that might cause problems in edge cases
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