Kerno is an AI runtime QA engineer for backend code that runs inside coding agents such as Claude Code, Cursor, and Codex. It indexes a repository, maps critical user flows, then autonomously writes and executes integration tests against the live application and its real dependencies. Kerno catches runtime bugs, regressions, and security issues that static code review and AI-generated unit tests typically miss. As the codebase evolves, Kerno self-heals and updates its test suite automatically, keeping coverage complete without manual effort.