I've had a lot of luck with Claude on my 8 year old, multi-language codebase. But I do have to babysit it and provide a lot of context. I created some tutorial

I've had a lot of luck with Claude on my 8 year old, multi-language codebase. But I do have to babysit it and provide a lot of context. I created some tutorial files which contain ways to do a lot of standard things. Turns out humans found these useful too. With the examples, I've found Opus generally does a good job following existing idioms, while Sonnet struggles.