CodeRabbit sits inside your pull request workflow on GitHub, GitLab, or Azure DevOps and runs automated analysis before a human reviewer touches the diff. It runs 40+ linters and security scanners, summarizes the diff with an architectural diagram, and lets engineers reply to its comments directly to refine future behavior. The agent learns from feedback you leave in natural language, so reviews drift toward your team's actual standards rather than generic rules. The ceiling appears when your policies are complex enough to need deterministic enforcement — the YAML customization covers a lot of ground, but teams with strict compliance gates will eventually need to validate whether the agent's judgment matches their audit requirements.