[jeffspinny]

I think the main thing LangGraph adds is a state machine framework for human in the loop with time travel.

So if you have an authoring workflow where a doc goes through a bunch of steps, and at some steps the analyst might want to fix some LLM output manually, and try a couple of things and then go back to the way it was before and try again, it will do that and you won't have to make your own state machine.

[datadrivenangel]

Now is it actually a state machine or is it just well logged?

[nfcampos]

LangGraph implements a variant of the Pregel/BSP algorithm for orchestrating workflows with cycles (ie. not DAGs) and parallelism without data races. You can design your graph as a state machine if you so desire