not a whole lot of documentation, I feel like a lot of knowledge is held within orgs. At my first job I often had to venture into the source code to figure out how something is supposed to work. Copilot has just came out then and it was terrible at helping with a Drupal 10 migration for example because the training data only had 8 and below and a lot of stuff obviously changed in-between.
I reckon AI must be much better now at this since it's doing all sorts of things, but I wonder if you still would need to have the repo cloned so that it can crosscheck with the source code. Since the knowledge cutoff should be around 2025, most of the stuff it knows should be plenty