S Nix

A Nix-based configuration framework for Model Control Protocol (MCP) servers with ready-to-use packages.

Overview

This repository provides both MCP server packages and a Nix framework for configuring and deploying MCP servers. It offers a modular approach to configuring various MCP servers with a consistent interface.

Features

• Modular Configuration: Define and combine multiple MCP server configurations
• Reproducible Builds: Leverage Nix for reproducible and declarative server setups
• Pre-configured Modules: Ready-to-use configurations for popular MCP server types
• Security-focused: Better handling credentials and sensitive information through envFile and passwordCommand, with pinned server versions
• Framework Support: Integrates with Flakes, flake-parts, devenv, and Home Manager

Quick Start

Run an MCP server directly:

nix run github:natsukium/mcp-servers-nix#mcp-server-fetch

Generate a configuration file with mkConfig:

# config.nix
let
  pkgs = import <nixpkgs> { };
  mcp-servers-nix = import (fetchTarball
    "https://github.com/natsukium/mcp-servers-nix/archive/main.tar.gz") { inherit pkgs; };
in
mcp-servers-nix.lib.mkConfig pkgs {
  programs.filesystem = {
    enable = true;
    args = [ "/path/to/allowed/directory" ];
  };
}

nix-build config.nix && cat result

{
  "mcpServers": {
    "filesystem": {
      "command": "/nix/store/7b4ancp3cns9lkkybd090qzr0hah5qq0-mcp-server-filesystem-2025.12.18/bin/mcp-server-filesystem",
      "args": [ "/path/to/allowed/directory" ]
    }
  }
}

The output format adapts to the flavor option — see Supported Flavors below.

Supported Flavors

Flavor	Key	Typical File	Client
claude	mcpServers	claude_desktop_config.json	Claude Desktop
claude-code	mcpServers	.mcp.json	Claude Code
vscode	mcp.servers	settings.json	VS Code
vscode-workspace	servers	.vscode/mcp.json	VS Code (workspace)
codex	mcp_servers	.mcp.toml	Codex CLI
opencode	mcp	opencode.json	OpenCode
zed	context_servers	(varies)	Zed

Available Modules

• clickup
• codex
• context7
• deepl
• esa
• everything
• fetch
• filesystem
• freee
• git
• github
• grafana
• home-assistant
• mastra
• memory
• netdata
• nixos
• notion
• playwright
• sequential-thinking
• serena
• slite
• tavily
• terraform
• textlint
• time

Examples

Check the examples directory for complete configuration examples:

• claude-desktop.nix: Basic configuration for Claude Desktop
• vscode.nix: VS Code integration setup
• librechat.nix: Configuration for LibreChat integration
• codex.nix: Codex CLI integration with MCP servers
• opencode.nix: OpenCode CLI integration with MCP servers
• vscode-workspace: VS Code workspace configuration example
• flake-parts-module: Flake-parts module integration with multi-flavor support
• devenv: devenv integration using claude.code.mcpServers
• home-manager: Home Manager integration with programs.mcp.servers

Real World Examples

Check out GitHub search results for examples of how others are using mcp-servers-nix in their projects.

Documentation

• Module Usage Guide — How to configure MCP servers with Nix (classic, npins, flakes, flake-parts)
• Configuration Reference — Security, credential handling, and flake-parts options
• Module Options Reference — Auto-generated list of all module options
• Packages Guide — Using standalone MCP server packages
• Contributing Guide — Adding new packages and modules

License

This project is licensed under the Apache License 2.0 - see the LICENSE file for details.