I don't think the invention of writing is as awe-inspiring as presented or as difficult/impossible for an LLM to achieve as is commonly believed. The invention of writing was a long series of micro-improvements over common every day things. Let's keep track of count by writing a line in the sand. Let's cut it into a tree. Let's push the line into clay. Let's use two lines touching. These are the kinds of things an LLM can also reason through and achieve.

I reject this idea that an LLM couldn't come up with something novel that isn't in the training data. We know it can come up with sentences that aren't in there. We know it can come up with mathematic proofs that aren't in there. So could it feasibly create something as fundamental as writing or language? Would we even be able to understand what it had done, or would it be so foreign to us that we wouldn't even realize?

Those early writers did have a training set of human knowledge that led them to pushing stones into clay. And our agents may very well have a set of knowledge that leads it to pushing their proverbial stone into their proverbial clay too.