mcp-nix 0.2.1

MCP server for Nixpkgs, NixOS and Home Manager

A tasteful MCP server for the Nix ecosystem

Ecosystem coverage

• Nixpkgs
• NixOS
• Home Manager
• Nixvim
• nix-darwin
• NixHub
• Noogle (Nix standard library)

Without additional configuration, only Nixpkgs and NixOS categories are included.

Installation

Use the following configuration to add the MCP server to your client:

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

Using Nix

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

Tools

• Categories included by default:

Category	ID	Tools
Nixpkgs	nixpkgs	search_nixpkgs, show_nixpkgs_package, read_derivation[^a]
NixOS	nixos	search_nixos_options, show_nixos_option, list_nixos_channels, read_nixos_module[^a]

• Categories excluded by default

Category	ID	Tools
Home Manager	homemanager	search_homemanager_options, show_homemanager_option, list_homemanager_releases, read_home_module[^a]
Nixvim	nixvim	search_nixvim_options, show_nixvim_option, read_nixvim_declaration[^a]
nix-darwin	nix-darwin	search_nix_darwin_options, show_nix_darwin_option, read_nix_darwin_declaration[^a]
NixHub	nixhub	list_package_versions, find_nixpkgs_commit_with_package_version
Noogle	noogle	search_nix_stdlib, help_for_stdlib_function

[^a]: Requires explicit --include even when the category is enabled.

Including tools

• By category
  • Pass the category's ID as an argument: --homemanager --nixvim
• By name
  • Use --include: --include=list_package_versions,...

Excluding tools

• By category
  • Prefix the category's ID by "no-": --no-nixos
• By name
  • Use --exclude: --exclude=find_nixpkgs_commit_with_package_version,...

List of tools

Tool	Usage
nixpkgs
search_nixpkgs	Search for Nixpkgs packages by name or description
show_nixpkgs_package	Get details for a Nixpkgs package by exact name
read_derivation[^a]	Read the Nix source code for a package derivation
nixos
search_nixos_options	Search NixOS configuration options
show_nixos_option	Get details for a NixOS option, or list children if given a prefix
list_nixos_channels	List available NixOS release channels
read_nixos_module[^a]	Read the Nix source code for a NixOS option declaration
homemanager
search_homemanager_options	Search Home Manager options for user environment configuration
show_homemanager_option	Get details for a Home Manager option, or list children if given a prefix
list_homemanager_releases	List available Home Manager releases
read_home_module[^a]	Read the Nix source code for a Home Manager option declaration
nixvim
search_nixvim_options	Search NixVim configuration options
show_nixvim_option	Get details for a NixVim option, or list children if given a prefix
read_nixvim_declaration[^a]	Get the declaration reference for a NixVim option
nix-darwin
search_nix_darwin_options	Search nix-darwin configuration options for macOS
show_nix_darwin_option	Get details for a nix-darwin option, or list children if given a prefix
read_nix_darwin_declaration[^a]	Get the declaration reference for a nix-darwin option
nixhub
list_package_versions	List all available versions for a Nixpkgs package
find_nixpkgs_commit_with_package_version	Get the nixpkgs commit hash for a specific package version
noogle
search_nix_stdlib	Search Nix standard library functions by name or type signature
help_for_stdlib_function	Get detailed help for a Nix standard library function
[^a]: Requires explicit --include even when the category is enabled.

Contributing

Read CONTRIBUTING.md

Credits

Thanks to the NixOS Search Team, ExtraNix, NüschtOS, NixHub, Noogle for maintaining the backends and pipeline this server uses and for the Nix community for making any of this possible.

License

GPLv3: License