{
    description = "NixOS server fleet";

    inputs = {
        nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
        disko.url = "github:nix-community/disko";
        disko.inputs.nixpkgs.follows = "nixpkgs";
        home-manager.url = "github:nix-community/home-manager";
        home-manager.inputs.nixpkgs.follows = "nixpkgs";
        agenix.url = "github:ryantm/agenix";
        agenix.inputs.nixpkgs.follows = "nixpkgs";

    };

    outputs = { self, nixpkgs, disko, home-manager, agenix }:
    let
        # options
        system = "x86_64-linux";
        release = "25.11";
        myUser = "victor";

        # helper
        lib = nixpkgs.lib;
    in {
        nixosConfigurations = {
            isengard = lib.nixosSystem {
                inherit system;
                specialArgs = { inherit release myUser disko agenix system; };
                modules = [
                    ./modules/base.nix
                    ./hosts/isengard.nix
                ];
            };
            palantir = lib.nixosSystem {
                inherit system;
                specialArgs = { inherit release myUser disko; };
                modules = [
                    ./modules/base.nix
                    ./hosts/palantir.nix

                    home-manager.nixosModules.home-manager
                    ./modules/home.nix
                ];
            };
        };
    };
}