How to Add Claim Verification to Your LangChain Agent in 5 Minutes

Your LangChain agent is wrong about 10% of the time. Not occasionally — consistently, confidently, and silently. The problem isn't the model. It's that your agent has no way to know when it's wrong. It receives information, formats a response, and acts. No second opinion. No fact-check. No circuit breaker. This tutorial shows you how to add a verification layer in 5 minutes that catches hallucinations before your agent acts on them. The Problem LLM hallucination rates in 2026 range from 3% to 20