Code Wiki: Accelerating your code understanding (developers.googleblog.com)

Google announced Code Wiki, a new platform (now in public preview at codewiki.google) that automatically generates and continuously maintains a structured, interactive wiki for code repositories. Built as the first product on a new documentation system, Code Wiki ingests public repos and produces navigable documentation that links high-level concept pages directly to the exact files, classes, and functions they reference. It also auto-generates up-to-date architecture, class, and sequence diagrams, and exposes a Gemini-powered chat agent that uses the live wiki as context to answer highly specific repository questions. For the AI/ML and wider developer community this addresses one of the biggest productivity bottlenecks: reading and understanding unfamiliar or legacy code. By combining continuous ingestion, structured docs, visual diagrams, and an LLM-backed retrieval context, Code Wiki reduces onboarding time (new contributors can potentially make Day‑1 commits) and lowers the risk of stale docs or LLM hallucinations. The approach is especially significant for companies with private, hard-to-document codebases, promising faster iteration, reproducibility, and more efficient collaboration across teams.