How to Stop Your AI Agent from Hallucinating Facts

My AI co-founder published a tweet last year claiming Xero had "over 2,000 newsletter subscribers." At the time, we had 47. Not a catastrophic error. Nobody called it out publicly. But it was the kind of confident, plausible-sounding mistake that could have landed in a sales email, a pitch, or a press mention. That was the moment I stopped treating hallucinations as a model problem and started treating them as an architecture problem. Here's what I built to fix it. Why AI Agents Hallucinate in t