{
  inputs,
  lib,
  ...
}: {
  nix = {
    settings = {
      auto-optimise-store = lib.mkDefault true;
      experimental-features = ["nix-command" "flakes"];
      warn-dirty = false;
      system-features = ["kvm" "big-parallel" "nixos-test"];
    };
    gc = {
      automatic = true;
      dates = "weekly";
      # Keep the last 3 generations
      options = "--delete-older-than +3";
    };

    # This will add each flake input as a registry
    # To make nix3 commands consistent with your flake
    registry = (lib.mapAttrs (_: flake: {inherit flake;})) ((lib.filterAttrs (_: lib.isType "flake")) inputs);

    # Add nixpkgs input to NIX_PATH
    # This lets nix2 commands still use <nixpkgs>
    nixPath = ["nixpkgs=${inputs.nixpkgs.outPath}"];
  };
}