They can ask, they can do a back and forth and they can write documentation to be used from that point onwards and write it in a common style and structure.

These are language models, being able to talk through something with them and have them extract some information is what they excel at. Given that you’d probably get a halfway decent result with a literal fixed set of questions (an Eliza level docbot) gpt 5.5 is going to nail that as a task.