As a user, I don't want to sit there specifying about 15-30 files, then realize that I've missed some and that it ruins everything. I want to just point the tool at the codebase and tell it: "Go do X. Look at the current implementation and patterns, as well as the tests, alongside the docs. Update everything as needed along the way, here's how you run the tests..."
Indexing the whole codebase into Qdrant might also help a little.