Code Wiki by Google is an AI-powered platform that automatically generates and continuously updates structured documentation for software repositories. It scans an entire codebase to create a browsable wiki with linked files, classes, and functions, regenerating explanations and diagrams after every change to keep docs in sync with the latest code.[1][3][5] The tool also includes a Gemini-powered chat interface that understands the full repository, allowing developers to ask questions, trace code paths, and explore architectures through grounded, source-linked answers.[1][2][3] A public preview supports open-source projects today, with a Gemini CLI extension for private, internal repositories planned for the future.[1][3][4]