If a chatbot answers a question, an agent tries to finish a job. That difference matters because it changes what you must design. The useful definition An AI agent is a model-driven system given a goal, a set of tools, and rules for acting. It plans or selects a next step, uses tools when needed, observes the result, and keeps going until it reaches a finish condition or hits a boundary. That means a good agent brief is not just a prompt. It includes the job, the data it can read, the systems it can touch, the actions it may…
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