MCP-NixOS is a Model Context Protocol (MCP) server designed to provide accurate, real-time access to NixOS-related data, including packages, system options, Home Manager configurations, and nix-darwin settings. Its primary goal is to prevent AI hallucinations by supplying AI assistants with reliable and up-to-date information about NixOS. The project supports over 130,000 NixOS packages, 22,000 configuration options, 4,000 Home Manager options, and 1,000 nix-darwin macOS settings. It also integrates with NixHub.io to provide package version history and commit hashes, enabling users to find specific versions of packages. MCP-NixOS is designed to be cross-platform and does not require users to have Nix or NixOS installed, as it operates by querying web APIs. It offers two main installation options: using uvx for most users or using Nix for those familiar with the Nix ecosystem. The server provides a variety of tools for searching and retrieving detailed information about NixOS packages, options, flakes, Home Manager settings, and nix-darwin configurations. It also includes features for browsing categories, exploring options by prefix, and accessing version history. The project underwent a major rewrite in version 1.0.0, simplifying the codebase by removing complex caching and abstractions, resulting in a stateless, direct API access server that is easier to maintain and use. It emphasizes real-time data delivery, smart suggestions for option names, enhanced error messages, and deduplication of search results. MCP-NixOS is well-tested with 367 tests, including real API calls and cross-platform validation. Developers can contribute using either Nix or standard Python development workflows. The project is licensed under the MIT License and acknowledges its reliance on external services like NixHub.io and search.nixos.org for data. Overall, MCP-NixOS is a valuable tool for anyone needing precise and current NixOS data integrated into AI assistants or other applications.
https://github.com/utensils/mcp-nixos
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