ReddRadar
Agent skill
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.
Install this agent skill to your Project
npx add-skill https://github.com/majiayu000/claude-skill-registry/tree/main/skills/data/bug-detector
SKILL.md
Bug Detector Skill
Instructions
- Analyze code for potential bugs and logic errors
- Check for null/undefined handling
- Identify edge cases that aren't handled
- Look for type errors and runtime exceptions
- Check for off-by-one errors
- Identify race conditions (if applicable)
- 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:
### 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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