Deterministic Quality Assurance plugin for Claude Code. CRAP stands for Change Risk Anti-Patterns — a metric originally developed by Alberto Savoia and Bob Evans at Google in 2007 to identify code that is both complex and under-tested. Inspired by their work. Claude-crap wraps every Write, Edit, and Bash tool call with a PreToolUse gatekeeper, a PostToolUse verifier, and a Stop quality gate backed by the CRAP index, Technical Debt Ratio, tree-sitter AST metrics, and SARIF 2.1.0 reports. Auto-detects and runs ESLint, Semgrep, Bandit, and Stryker at boot so users get real A..E quality grades out of the box. Forbids the agent from writing functional code before a test safety net exists (the Golden Rule).