CodeAlmanac auto-generates a codebase wiki from your AI coding agent chats

A YC S26 startup called Almanac has launched CodeAlmanac, a free, open-source tool that automatically builds and maintains a wiki from conversations with AI coding agents like Claude Code and Codex. The tool creates an 'almanac/' folder inside a repository, storing interconnected Markdown pages that document decisions, design rationale, and context not captured in the code itself. Pages are indexed in SQLite and searchable via a CLI, with future agent sessions instructed to consult the wiki before beginning work. Rather than triggering updates on every commit, the system runs an agent every five hours to review new conversations and refresh relevant pages, keeping token costs manageable. The team built it after finding that single manual documentation files like DESIGN.md quickly became outdated, and that teammates' agents lacked context on past architectural decisions.