This, at least for me, has changed in the past six months. Which is the same thing people were saying in the months prior to that, so I will accept some eye rolls. But at least for our pretty large monorepo opus + a lot of engineering work on context got us to a point where a large portion of our engineers are doing most of their work with agents first and a lot of back and forth + smaller hand edits.
Agreed. The size of the repo isn't a limiting factor anymore. It's more about the type of change.
Agents today can generate solid code even for relatively complex requirements. However, they don't always make the right trade-offs.
Just because something works doesn't mean it scales. It doesn't mean it can handle unexpected user input. It doesn't mean it's easily extensible.
Today engineers really just need to define those high-level technical requirements.