This is the pattern I keep noticing too. A lot of "good engineering hygiene" that got dismissed as overhead is now paying dividends specifically because agents can consume it.

Detailed commit messages: ignored by most humans, but an agent doing a git log to understand context reads every one. Architecture decision records: nobody updates them, but an agent asked to make a change that touches a core assumption will get it wrong without them.

The irony is that the practices that make code legible to agents are the same ones that make it legible to a new engineer joining the team. We just didn't have a strong enough forcing function before.