Still trying it out, but here's my feedback so far:

- Overall the approach is sound, to generate various levels of documents from requirements to finer grained ones

- I'm not sure if that's intended, but I got asked about four questions and then the model one shot all three documents at once, ideally you'd work on one at a time, then once you're happy generate the next level of documents

- The prompting by the model was very shallow, it didn't ask enough questions so the requirements were off. I was expecting more questions so that the model had more information to work with. The docs can be iteratively reworked but I think it should make a better effort at the first take.

- I don't think there's any versioning of documents but that would be useful

- Dispatching subagents to review the generated plans would be nice

Overall it's pretty reasonable, I can see it being pretty useful. Send me an email if you need more details.