Your agent confirms an operation with full confidence: reference number, details, status. One problem, the data is made up. A single agent cannot check its own work; a plausible invented answer sounds just as sure as a real one. The fix is to stop trusting one agent to grade itself. Split the job: one agent does the work, a second independently checks that the data actually exists, and a third makes the final call. You see the same booking run through one agent that invents a hotel, then through the team that catches the lie before the user ever sees it. You'll walk away with the do, check, and decide pattern, and a simple way to tell when the extra agents are worth the cost.

Outline: • Single-Agent Hallucination • Multi-Agent Pattern • Live Implementation • Production Patterns • Advanced Applications