it's often not a single prompt but a tree or rooted DAG of many prompts, with the root node being the final prompt. the prompts on interior nodes might not make much sense without the intermediate responses as well. how would you like this communicated?

Just a chat log would be acceptable. Like an IRC channel log or slack channel history. It would be even better if, say in the case of code, there was a durable mapping between prompts and commits, that way I could follow the prompts linearly and review every commit associated with that prompt. For other forms of output (prose, pictures, whatever) this would also be useful to be able to see the history of its development.