An agent is an LLM wrecking its environment in a loop

Solomon Hykes just presented the best definition of an AI agent I've seen yet, on stage at the AI Engineer World's Fair:

An AI agent is an LLM wrecking its environment in a loop.

I collect AI agent definitions and I really like this how this one combines the currently popular "tools in a loop" one (see Anthropic) with the classic academic definition that I think dates back to at least the 90s:

An agent is something that acts in an environment; it does something. Agents include worms, dogs, thermostats, airplanes, robots, humans, companies, and countries.