Identify duplicated code, inconsistent patterns, and refactoring opportunities. Prefer pnpx fallow when available for deeper static analysis; use this skill to interpret, prioritize, and turn findings into a practical refactor plan.
When to Use
- "Find duplicate code"
- "What needs refactoring?"
- "Are there inconsistent patterns?"
- Code review prep
- Pre-refactor analysis
Detection Process
- Tool scan - Run
pnpx fallowwhen available, then supplement with targeted grep/search - Cluster - Group similar issues
- Prioritize - Rank by frequency × impact
- Report - Show findings with locations and suggested refactor seams
Quick Patterns
| Debt Type | Detection Method |
|---|---|
| Duplicated code | Hash-compare function bodies |
| Similar-but-diff | Fuzzy match on structure |
| Inconsistent naming | Regex for mixed conventions |
| Dead code | Unreferenced exports/functions |
| Deferred-work notes | Grep for comment markers |
| Magic numbers | Literals outside const/config |
| Long functions | Line count > threshold |
| Deep nesting | Indentation level analysis |
Output Format
## Technical Debt Report
### High Priority (fix soon)
- [DUPLICATE] src/utils/format.ts:23 ↔ src/helpers/fmt.ts:45
Similar: 87% | Impact: High (called 12 places)
### Medium Priority (plan for)
- [INCONSISTENT] Mixed naming: getUserData vs fetch_user
Files: api.ts, service.ts, handler.ts
### Low Priority (track)
- [DEFERRED] 23 deferred-work comments, oldest: 2023-01-15
References
- detection-patterns.md - Pattern matching rules
- prioritization.md - Scoring and ranking
- refactoring-strategies.md - Fix suggestions