Cost Verification Auditor Verify that token cost estimates are within ±20% of actual Claude API usage. When to Use ✅ Use for : - Validating token estimation systems after implementation - Pre-deployment cost accuracy checks - Debugging unexpected API bills - Periodic estimation drift detection ❌ NOT for : - Looking up model pricing (use pricing docs) - Budget planning or forecasting - Cost optimization strategies - Comparing models by price Core Audit Process Decision Tree Variance Formula Common Anti-Patterns Anti-Pattern: The 500-Token Overhead Myth Novice thinking : "Claude Code adds 500 t…