I dunno, but in my experience Claude looks at all the levers in your codebase, understands what they do, and then generally figures out how to achieve the desired end result.

And when it doesn't, it's usually because of things outside of the codebase -- iOS layout quirks that aren't documented, buggy Python libraries it's relying on where you then have to tell it to read the source to figure out what's going on, that kind of thing.