Your agent confirms an operation with full confidence: reference number, details, status. One problem, the data is made up. The agent invented the whole result, and your user will not find out until it causes real damage. A single agent cannot check its own work. When it writes a plausible answer, nothing tells the real data from the invented data, and it sounds just as sure either way. The fix is to stop trusting one agent to grade itself. Split the job: one agent does the work, a second one independently checks that the data actually exists, and a third makes the final call. They hand off to each other on their own, sharing what they know. 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 for your own agents, and a simple way to tell when a second and third agent are worth the extra cost.

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