nix-agent

This server provides two core tools for managing NixOS/Home Manager configurations:

• inspect_state: Read any local file and return its contents — useful for inspecting NixOS config files, flake inputs, or any other file before making changes.

• apply_patch_set: Write a set of file replacements to disk, automatically format any .nix files modified, and optionally validate and switch the system configuration. Supports two modes:

  • nixos (default): runs nixos-rebuild dry-activate for validation, then nixos-rebuild switch (with sudo) to activate

  • home-manager: runs home-manager build then home-manager switch (no sudo required)

  • Returns a rollback_generation value so any bad switch can be quickly undone

Provides tools for inspecting local NixOS configuration files and applying patch sets to modify and rebuild NixOS or Home Manager configurations via nixos-rebuild or home-manager commands.

1. Click on "Install Server".

2. Wait a few minutes for the server to deploy. Once ready, it will show a "Started" state.

3. In the chat, type @ followed by the MCP server name and your instructions, e.g., "@nix-agent Apply the patch set to switch my Home Manager configuration."

That's it! The server will respond to your query, and you can continue using it as needed.

Here is a step-by-step guide with screenshots.