check-input-validationlisted

# Input Validation Check Skill ## Purpose Validates that user-supplied inputs are properly bounded and validated before use. Catches division-by-zero, unbounded pagination, missing cache key components, and numeric range violations. ## CLAUDE.md Compliance - ✅ Enforces Security Engineering Rules: Input Domain Validation - ✅ Prevents divide-by-zero panics from user input - ✅ Validates pagination bounds per CLAUDE.md - ✅ Checks cache key completeness for tenant isolation ## Usage Run this skill: - After adding new math operations on user input - After adding new API endpoints with pagination - After modifying cache key construction - After adding recipe/nutrition calculations - Before committing code that processes numeric user input ## Commands ### Division Safety Check ```bash echo "=========================================" echo " INPUT VALIDATION CHECK" echo "=========================================" echo "" echo "--- 1. Division Safety ---" # Find all division operations in production code echo "🔍 Scanning for division operations..." rg " / " src/ --type rust -n | \ rg -v "test|//|mod |use |impl " | \ rg -v "\.len\(\) / |as f64 / |as f32 / " > /tmp/divisions.txt # Check each for guards echo "Division operations found:" cat /tmp/divisions.txt | head -20 # Check for .max(1) or similar guards near divisions echo "" echo "🔍 Checking for zero-guards near divisions..." rg "\.max\(1\)|\.max\(1\.0\)|checked_div|if.*==.*0|if.*>.*0" src/ --type rust -n | wc -l echo