Ontologies Are So Back: Why AI Agents Are Reviving the Semantic Web AI engineers are rediscovering ontologies as a way to keep probabilistic agents inside deterministic boundaries. One of the most watched videos from the recent AI Engineer World’s Fair is a 20-minute talk by Frank Coyle, a professor of computer science who currently teaches generative AI and LLMs at UC Berkeley. Drawing on his decades of experience, Coyle re-introduced the concept and practice of ontologies to today’s AI engineers. Coyle argued that while LLMs are very effective at providing probabilistic reasoning, for agenti