I'd think something as dumb (for the user, but complex to make) as a GraphRAG system that already has a developer's code repo and design docs in the system, and is then able to be given "candidate libraries" which the GraphRAG+LLM reasoning agent then evaluates the candidate against the active project for compatibility. That would be one decent application, but the better one is once a "candidate library" is accepted, that GraphRAG+LLM agent can just-in-time explain to the developer how a library works and should integrate with their active code base than any documentation.
Fairly readable and doesn't seem wrong ( havent gone in depth yet)
Edit: fwiw I am an “engineering leader,” and I do think it would be nice to have a model that could answer questions about our codebase at work, but we’d need some guarantees that the data would not be used for training, stored inappropriately, etc.