My AI-Written Test Suite Hit 94% Coverage. Then I Mutated the Code.

<p>The more I use AI tools like Claude Code, the clearer it becomes: engineering skills are what make AI output worth shipping.</p> <p>AI makes writing code faster. But shipping

<p>Every team I've worked on has had the same conversation at some point. Someone opens the coverage report, sees a sea of red, and asks: "How do we get this up?" The answer is

<p>Your Python project has 30% test coverage. Not because testing is hard — because writing tests is tedious. Claude Code changes the economics.</p> <p>These 4 workflows generate

<p>An agent patch that passes its own tests is a baseline, not a verdict. The same model wrote the code and the tests, so both share the same blind spots. Mutation testing scores