Sage AI provides a symbol-level, deeply contextualized knowledge base to streamline the management and comprehension of large, complex, or aging codebases. It offers autogenerated documentation, reference guides, and walkthroughs. By maintaining itself, Sage AI allows developers to focus more on actual development work, reducing onboarding time and facilitating knowledge sharing effectively. With features like in-built chat, it de-silos team and individual knowledge, making it an invaluable tool for maintaining expertise across various systems.