The definition of agent is interpreted differently by different people

First off, the word agent as currently used with LLMs or chatbots is not a new term. The word agent has been around for some time with AI in general.

One of the classic books on AI “Artificial Intelligence : A Modern Approach” by Stuart J. Russell and Peter Norvig (WorldCat) gives

An agent is just something that acts (agent comes from the Latin agere, to do).

As such it is a very open definition.

However there are much more specific examples of agents noted in the book,

A related post with some more information.

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