Historian is a Model Context Protocol (MCP) server that empowers Claude Code to directly access and search your past conversation history. It runs locally, ensuring privacy and offering fast, intelligent search capabilities. Leveraging SQLite's FTS5 with advanced features like prefix matching, stemming, fuzzy search, and time decay, it helps developers quickly find solutions to previous problems, track file-related discussions and changes, retrieve solutions for recurring errors, and analyze their past interactions and tool usage patterns within Claude Code.