MCP-NixOS - Because Your AI Shouldn't Hallucinate Package Names

Quick Start

🚨 No Nix/NixOS Required! Works on any system - Windows, macOS, Linux. You're just querying APIs.

Option 1: uvx (Recommended)

{
  "mcpServers": {
    "nixos": {
      "command": "uvx",
      "args": ["mcp-nixos"]
    }
  }
}

Option 2: Nix

{
  "mcpServers": {
    "nixos": {
      "command": "nix",
      "args": ["run", "github:utensils/mcp-nixos", "--"]
    }
  }
}

Option 3: Docker

{
  "mcpServers": {
    "nixos": {
      "command": "docker",
      "args": ["run", "--rm", "-i", "ghcr.io/utensils/mcp-nixos"]
    }
  }
}

Your AI now has access to real NixOS data instead of making things up. You're welcome.

What Is This?

An MCP server providing accurate, real-time information about:

• NixOS packages - 130K+ packages that actually exist
• NixOS options - 23K+ ways to configure your system
• Home Manager - 5K+ options for dotfile enthusiasts
• nix-darwin - 1K+ macOS settings Apple doesn't document
• Nixvim - 5K+ options for Neovim configuration via NuschtOS search
• FlakeHub - 600+ flakes from FlakeHub.com registry
• Package versions - Historical versions with commit hashes via NixHub.io

The Tools

Just two. We consolidated 17 tools into 2 because your AI's context window isn't infinite.

~365 tokens total. That's it. While other MCP servers are hogging your context like it's Black Friday, we're sipping minimalist tea in the corner. Your AI gets NixOS superpowers without the bloat.

nix - Unified Query Tool

One tool to rule them all:

nix(action, query, source, type, channel, limit)

Action	What it does
search	Search packages, options, programs, or flakes
info	Get detailed info about a package or option
stats	Get counts and categories
options	Browse Home Manager/Darwin options by prefix
channels	List available NixOS channels

Source	What it queries
nixos	Packages, options, programs
home-manager	Home Manager options
darwin	nix-darwin options
flakes	Community flakes (search.nixos.org)
flakehub	FlakeHub registry (flakehub.com)
nixvim	Nixvim Neovim configuration options

Examples:

# Search NixOS packages
nix(action="search", query="firefox", source="nixos", type="packages")

# Get package info
nix(action="info", query="firefox", source="nixos", type="package")

# Search Home Manager options
nix(action="search", query="git", source="home-manager")

# Browse darwin options
nix(action="options", source="darwin", query="system.defaults")

# Search Nixvim options
nix(action="search", query="telescope", source="nixvim")

# Get Nixvim option info
nix(action="info", query="plugins.telescope.enable", source="nixvim")

# Search FlakeHub
nix(action="search", query="nixpkgs", source="flakehub")

# Get FlakeHub flake info
nix(action="info", query="NixOS/nixpkgs", source="flakehub")

# Get stats
nix(action="stats", source="nixos", channel="stable")

nix_versions - Package Version History

Find historical versions with nixpkgs commit hashes:

nix_versions(package, version, limit)

Examples:

# List recent versions
nix_versions(package="python", limit=5)

# Find specific version
nix_versions(package="nodejs", version="20.0.0")

Installation

You DON'T need Nix installed. This runs anywhere Python runs.

# Run directly (no install)
uvx mcp-nixos

# Or install
pip install mcp-nixos

For Nix users:

nix run github:utensils/mcp-nixos
nix profile install github:utensils/mcp-nixos

Development

nix develop          # Enter dev shell
nix build            # Build package
pytest tests/        # Run tests
ruff check .         # Lint
ruff format .        # Format
mypy mcp_nixos/      # Type check

Acknowledgments

• NixHub.io - Package version history
• search.nixos.org - Official NixOS search
• FlakeHub - Flake registry by Determinate Systems
• Jetify - Creators of Devbox and NixHub
• NuschtOS - Static option search infrastructure powering Nixvim support
• Nixvim - Neovim configuration framework for Nix

License

MIT - Because sharing is caring.

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Created by James Brink. Maintained by mass̶o̶c̶h̶i̶s̶t̶s̶ enthusiasts who enjoy Nix.