> what problems can I solve, that can be only done with an agent?
The problem that you might not intuitively understand how agents work and what they are and aren't capable of - at least not as well as you would understand it if you spent half an hour building one for yourself.
>> what problems can I solve, that can be only done with an agent?
> The problem that you might not intuitively understand how agents work and what they are and aren't capable of
I don't necessarily agree with the GP here, but I also disagree with this sentiment: I don't need to go through the experience of building a piece of software to understand what the capabilities of that class of software is.
Fair enough, with most other things (software or otherwise), they're either deterministic or predictably probabilistic, so simply using it or even just reading how it works is sufficient for me to understand what the capabilities are.
With LLMs, the lack of determinism coupled with completely opaque inner-workings is a problem when trying to form an intuition, but that problem is not solved by building an agent.
The problem that you might not intuitively understand how agents work and what they are and aren't capable of - at least not as well as you would understand it if you spent half an hour building one for yourself.