The best non technical explanation you can give is "An AI agent is an LLM that can take actions".
While an agent doesn't necessarily have to be powered by an LLM, most modern AI agents are.
You pointing at a human brain does not change that an AI agent is not intelligent and cannot think, we are still talking about probability built on statistics with extra steps.
I am not trying to be dishonest, we should stop making analogies between AI and actual thinking, because they are two entire different concepts.
Who developed these technologies used the words "thinking" and "reasoning", this does not mean they are actually thinking and reasoning. Somewhere you still have a processor calculating, with no empathy.
So, again: stop humanizing AI. This sentence shouldn't make you angry.
> we are still talking about probability built on statistics with extra steps.
There is a wrong assumption here: confusing primitives with emergent properties.
One can't look at the primitivies and assume that certain properties will not emerge. It would be exactly like looking at aminoacids and state that intelligence can't develop from them.
> You pointing at a human brain does not change that an AI agent is not intelligent and cannot think
That depends on the definition of intelligence and thinking, and it is dishonest not to give any definition (and most importantly, one that is not human-centered).
AIs are currently fulfilling several aspects of intelligence and thinking, by any defition of intelligence. If you don't notice that, it's just because you have informed yourself enough. Having said that, I don't doubt that there are aspects that AI are lacking (e.g. retention/plasticity/perception), but the line is blurry, and they're advancing (too) fast.
Empathy is actually a very important aspect of the AI problems, but it's not part of intelligence. Sociopaths don't have it, and yet, you wouldn't doubt that they're intelligent.