[mindcrime]

They consider the User Stories + the code to be everything you need

Then they are Doing It Wrong™. Note that there's nothing in the Agile Manifesto OR the Scrum Guide that says "don't write documentation." The closest you get is in the AM where it says "We have come to value ... Working software over comprehensive documentation". But note that immediately after that it says "That is, while there is value in the items on the right, we value the items on the left more." IOW, the Agile Manifesto explicitly endorses the value of documentation!

Remember this the next time somebody tries to tell you that "we don't do documentation because we're Agile." Anybody running that line is Full Of Shit™.