The subtle bugs are horrible.

We used Claude Code the other day to add a new record type to an API and it was mostly right. CC decided (for some weird reason) to use a slightly different return shape on a list endpoint than the entire rest of the API. It changed two field names (count/items became total_count/data). This divergence was missed until the code was released because it 'worked' and had full tests and everything. But when the standard client lib code was used to access the API it failed on the list endpoint. Didn't take long to discover the issue. Luckily, it was a new feature so nothing broke, but it was a very clear reminder that you have to be very thorough when reviewing coding agent PRs.

FWIW, I use CC frequently and have mostly positive things to say about it as a tool.