crap-score Skill

Source

• Creator: microsoft
• Repository: microsoft/testfx
• Skill file: .agents/skills/crap-score/SKILL.md

What it does

Calculates targeted CRAP (Change Risk Anti-Patterns) scores for a named .NET method, class, or single source file. Use when the user explicitly asks to compute CRAP scores or assess risky untested code for a specific target, combining Cobertura coverage data with cyclomatic complexity analysis. DO NOT USE FOR: project-

Skill instructions

CRAP Score Analysis Calculate CRAP (Change Risk Anti-Patterns) scores for .NET methods to identify code that is both complex and undertested. Background The CRAP score combines cyclomatic complexity and code coverage into a single metric: $$\text{CRAP}(m) = \text{comp}(m)^2 \times (1 - \text{cov}(m))^3 + \text{comp}(m)$$ Where: - $\text{comp}(m)$ = cyclomatic complexity of method $m$ - $\text{cov}(m)$ = code coverage ratio (0.0 to 1.0) of method $m$ | CRAP Score | Risk Level | Interpretation | |------------|------------|----------------| | < 5 | Low | Simple and well-tested | | 5-15 | Moderate | Acceptable for most code | | 15-30 | High | Needs more tests or simplification | | 30 | Critical | Refactor and add coverage urgently | A method with 100% coverage has CRAP = complexity (the minimum). A method with 0% coverage has CRAP = complexity^2 + complexity. When to Use - User wants to assess which methods are risky due to low coverage and high complexity - User asks for CRAP score of spe