Agent

In production AI, an agent is a system where the language model is given a task and a set of tools (functions it can call), and it iterates: model picks a tool, tool runs, result feeds back into the next call, repeat until the task is done. Agents are the most failure-prone class of AI software because each iteration can compound an earlier mistake — but also the most economically valuable when they work, because they replace whole workflows. Constrain the action space, persist intermediate state, and plan for human-in-the-loop on day one.