Every team I talk to treats hallucination like a model quality issue. "We'll just use a better model." "We'll add more context." "We'll fine-tune."

They're solving the wrong problem.

Hallucination in production agentic systems isn't primarily about model capability. It's about missing infrastructure—the absence of runtime checks that catch when an agent's output diverges from grounded reality.

You don't need a better model. You need better plumbing.

The Three Hallucination Modes That Actually Matter