- name
- code-complexity-analyzer
- description
- Measure cyclomatic complexity, cognitive complexity, and structural metrics for Python, JavaScript/TypeScript, and Go code. Use when analyzing code quality, finding complex functions, setting CI quality gates, reviewing code for refactoring candidates, or generating complexity reports. Supports per-function metrics, configurable thresholds, risk levels, and multiple output formats (text, JSON, markdown).
Code Complexity Analyzer
Measure cyclomatic, cognitive, and structural complexity per function. Pure Python, no dependencies.
Quick Start
# Analyze a directory
python3 scripts/analyze_complexity.py src/
# Analyze specific files
python3 scripts/analyze_complexity.py app.py utils.py
# Show all functions (not just violations)
python3 scripts/analyze_complexity.py src/ --verbose
# Custom thresholds
python3 scripts/analyze_complexity.py src/ --cc 15 --cog 20 --max-lines 80Output Formats
python3 scripts/analyze_complexity.py src/ --format text # human-readable (default)
python3 scripts/analyze_complexity.py src/ --format json # CI/tooling
python3 scripts/analyze_complexity.py src/ --format markdown # reportsSupported Languages
- Python (
.py) - JavaScript (
.js,.jsx,.mjs,.cjs) - TypeScript (
.ts,.tsx) - Go (
.go)
Metrics
| Metric | Description | Default Threshold |
|---|---|---|
| Cyclomatic (CC) | Independent execution paths | ≤10 |
| Cognitive (COG) | Perceived difficulty to understand (nesting-weighted) | ≤15 |
| Lines | Function length | ≤50 |
| Params | Parameter count | ≤5 |
| Nesting | Max nesting depth | ≤4 |
Risk Levels
- 🟢 Simple — CC≤5, COG≤8
- 🟡 Low — CC≤10, COG≤15
- 🟠 Moderate — CC≤20, COG≤25
- 🔴 High — CC>20 or COG>25
Options
--cc N Cyclomatic threshold (default: 10)
--cog N Cognitive threshold (default: 15)
--max-lines N Function length threshold (default: 50)
--max-params N Parameter count threshold (default: 5)
--max-nesting N Nesting depth threshold (default: 4)
--exclude DIR Additional directories to exclude
--verbose, -v Show all functions, not just violationsAuto-excluded: node_modules, .git, __pycache__, venv, dist, build.
Exit Codes
0— no violations1— violations found (functions exceed CC or COG thresholds)2— no analyzable files found