MCP-NixOS is a Model Context Protocol (MCP) server designed to enhance the accuracy of AI assistants when providing information about NixOS. It offers real-time access to NixOS packages, system options, Home Manager settings, and nix-darwin configurations, preventing AI from hallucinating incorrect information. With features like smart caching and rich search capabilities, MCP-NixOS ensures that AI assistants can provide reliable and up-to-date information, even offline.