Is anyone successfully integrating LLMs with their entire codebase?

My team is using tools like Copilot, Phind and Coderabbit, but these seem mostly useful for code suggestions and feedback related to individual files.

Is anyone successfully using tools which, via large context windows/RAG/other IR techniques, are able to generate or review code with complex dependencies across many different files and code areas (i.e. db, backend, API, frontend)? Or is this still a ways out?