I have been experimenting with agents for large codebases in Java and here's my opinion. Integrating and maxxing out rule based frameworks such as 100% unit test coverage, mutation test coverage, 0% sonar errors, using openrewrite as a default skill for refactoring. Check out this blog that I wrote on this : https://www.jaipilot.com/blog/preventing-agent-drift-serious-code-vibe-coding