CRAP Metrics for VS Code

A VS Code extension that shows Cyclomatic Complexity (CC) and CRAP Score directly above your C# methods using CodeLens — helping you quickly identify risky, untested code.

What is CRAP Score?

CRAP (Change Risk Anti-Patterns) score combines cyclomatic complexity with code coverage to highlight methods that are both complex and insufficiently tested.

CRAP(m) = CC(m)² × (1 - coverage(m))³ + CC(m)

Higher scores indicate code that is harder to maintain and more likely to break when modified.

CRAP Score	Meaning
≤ 5	Clean, well-tested code
6–15	Acceptable, could improve
16–30	Risky, add tests
> 30	Very high risk

Note on coverage: Code coverage requires running your test suite with a coverage tool (e.g. dotnet test --collect:"XPlat Code Coverage"). Without coverage data, the extension defaults to 0% coverage, which produces the worst-case CRAP score. This is intentional — it highlights untested complexity.

Features

🔍 Inline CodeLens showing CRAP: X.XX | CC: Y above every C# method
♻️ Refreshes automatically on file save
⚡ Powered by a local LSP server using Roslyn for accurate analysis
🎯 Quickly identify high-risk methods that need refactoring or tests

Requirements

.NET 8 Runtime installed and on PATH
VS Code 1.85+

Screenshot

CRAP Metrics Example

Shows CRAP score and Cyclomatic Complexity directly above C# methods.

License

MIT

CRAP Metrics