Complexity Skill

YOU MUST EXECUTE THIS WORKFLOW. Do not just describe it.

Analyze code complexity to identify refactoring targets.

Execution Steps

Given /complexity [path]:

Step 1: Determine Target

If path provided: Use it directly.

If no path: Use current directory or recent changes:

git diff --name-only HEAD~5 2>/dev/null | grep -E '\.(py|go)$' | head -10

Step 2: Detect Language

# Check for Python files
ls *.py **/*.py 2>/dev/null | head -1 && echo "Python detected"

# Check for Go files
ls *.go **/*.go 2>/dev/null | head -1 && echo "Go detected"

Step 3: Run Complexity Analysis

For Python (using radon):

# Check if radon is installed
which radon || pip install radon

# Run cyclomatic complexity
radon cc <path> -a -s

# Run maintainability index
radon mi <path> -s

For Go (using gocyclo):

# Check if gocyclo is installed
which gocyclo || go install github.com/fzipp/gocyclo/cmd/gocyclo@latest

# Run complexity analysis
gocyclo -over 10 <path>

Step 4: Interpret Results

Cyclomatic Complexity Grades:

Step 5: Identify Refactor Targets

List functions/methods that need attention:

• CC > 10: Should refactor
• CC > 20: Must refactor
• CC > 30: Critical, immediate action

Step 6: Write Complexity Report

Write to: .agents/complexity/YYYY-MM-DD-<target>.md

# Complexity Report: <Target>

**Date:** YYYY-MM-DD
**Language:** <Python/Go>
**Files Analyzed:** <count>

## Summary
- Average CC: <score>
- Highest CC: <score> in <function>
- Functions over threshold: <count>

## Refactor Targets

### Critical (CC > 20)
| Function | File | CC | Recommendation |
|----------|------|-----|----------------|
| <name> | <file:line> | <score> | <how to simplify> |

### High (CC 11-20)
| Function | File | CC | Recommendation |
|----------|------|-----|----------------|
| <name> | <file:line> | <score> | <how to simplify> |

## Refactoring Recommendations

1. **<Function>**: <specific suggestion>
   - Extract: <what to extract>
   - Simplify: <how to simplify>

## Next Steps
- [ ] Address critical complexity first
- [ ] Create issues for high complexity
- [ ] Consider refactoring sprint

Step 7: Report to User

Tell the user:

1. Overall complexity summary
2. Number of functions over threshold
3. Top 3 refactoring targets
4. Location of full report

Key Rules

• Use the right tool – radon for Python, gocyclo for Go
• Focus on high CC – prioritize 10+
• Provide specific fixes – not just “refactor this”
• Write the report – always produce artifact

Quick Reference

Simplifying High Complexity:

• Extract helper functions
• Replace conditionals with polymorphism
• Use early returns
• Break up long functions
• Simplify nested loops