I know people have been doing really cool things writing new projects. But everything I try to do with Sonnet 3.5 with an existing codebase, with its own intric

I know people have been doing really cool things writing new projects. But everything I try to do with Sonnet 3.5 with an existing codebase, with its own intricacies like library versions is really bad I've been trying to generate test coverage with 3.5 on a repo that has existed for years. it can take up to 20 attempts of file -> this is the error i get -> error -> error until i get one that runs successfully. It slightly improves when i give it a file, and also give it other files it successfully generated after 20 attempts and ask it to use the same style and learn from the changes it made previously to make it work But its very hard to get it done with less than 10 attempts.