Everyone is using the word ‘agent’. Almost nobody is using it the same way. This essay defines what an AI agent actually is, what it isn’t, and what separates a real production agent from a chatbot in a trench coat.
An AI agent is software that perceives, decides, acts and learns — autonomously, on your behalf. The precise definition, the anatomy, the architecture, and how a real production agent is built (and governed) in 2026.