You still need to describe systems in agile. All agile does is ask you to iterate, which means updating your design, your code, and your tests & documentation,

You still need to describe systems in agile. All agile does is ask you to iterate, which means updating your design, your code, and your tests & documentation, as you learn. Please read the agile manifesto again, and actually apply it. It does not say we don’t do design at all. Never did.