Agent skill

quality-complexity-check

Analyze code complexity metrics including cyclomatic complexity and nesting depth. Use to identify code that needs refactoring.

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Install this agent skill to your Project

npx add-skill https://github.com/majiayu000/claude-skill-registry/tree/main/skills/data/quality-complexity-check

SKILL.md

Complexity Check Skill

Analyze and report code complexity metrics.

When to Use

  • Code review process
  • Identifying refactoring candidates
  • Maintaining code quality
  • Before major releases

Quick Reference

bash
# Analyze Python code
./scripts/check_complexity.py

# Generate full report
./scripts/complexity_report.sh > complexity.txt

# Check Mojo code
./scripts/check_mojo_complexity.sh

Complexity Metrics

Cyclomatic Complexity (CC)

Measures decision points (if, for, while):

CC Range Assessment Action
1-10 Simple Keep as is
11-20 Moderate Consider refactoring
21+ Complex Needs refactoring

Nesting Depth

Maximum levels of nesting in function:

Depth Assessment Action
1-3 Good Keep as is
4-5 High Consider flattening
6+ Very High Refactor required

Function Length

Lines of code in function:

LOC Assessment Action
1-20 Good Keep as is
21-50 Acceptable Monitor
51+ Too long Consider splitting

Refactoring Patterns

Extract Function (High CC)

python
# Before (CC: 15)
def process(data):
    if condition1:
        if condition2:
            if condition3:
                for item in data:
                    if item.valid:
                        # process

# After (CC: 5)
def process(data):
    if not is_valid(data):
        return
    filtered = filter_valid_items(data)
    return process_items(filtered)

Flatten Nesting

Replace nested ifs with early returns:

python
# Before (depth: 5)
fn process(data):
    if check1(data):
        if check2(data):
            if check3(data):
                # complex logic

# After (depth: 2)
fn process(data):
    if not check1(data): return
    if not check2(data): return
    if not check3(data): return
    # complex logic

Workflow

bash
# 1. Analyze code
./scripts/check_complexity.py

# 2. Review high-complexity functions
grep "CC:" complexity.txt | grep -E "CC: [2-9][0-9]|CC: [1-9][0-9]{2}"

# 3. Plan refactoring
# ... extract functions, flatten nesting ...

# 4. Re-analyze
./scripts/check_complexity.py

# 5. Verify improved
git diff complexity.txt

Error Handling

Issue Fix
Script not found Check scripts/ directory
Syntax errors Fix code syntax before analyzing
No output Verify source files exist

Thresholds

Project thresholds:

  • Max CC per function: 15
  • Max nesting depth: 4
  • Max function length: 50 LOC
  • Minimum test coverage: 80%

References

  • Related skill: phase-cleanup for refactoring guidelines
  • Related skill: quality-run-linters for complete quality check

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