[jpk]

Just a drive-by thought, but: What you're describing sounds a lot like Temporal.io. I guess the difference is the "workflow" of an agent might take different paths depending on what it was asked to accomplish and the approach it ends up taking to get there, and that's what you're interested in persisting, replaying, etc. Whereas a Temporal workflow is typically a more rigid thing, akin to writing a state machine that models a business process -- but all the challenges around persistence, replay, etc, sound similar.

Edit: Heh, I noticed after writing this that some sibling comments also mention Temporal.