{
  flake.modules.nixos.host =
    { lib, ... }:
    {
      # ? Could potentially move this directly into the agenix module
      options = {
        # Host public SSH key (e.g. /etc/ssh/ssh_host_ed25519_key.pub).
        # We only set the hostPubkey if one is supplied. For new hosts the pub key will not
        # exist until it is generated after the first rebuild.
        hostPubkey = lib.mkOption {
          type = lib.types.nullOr lib.types.str;
          default = null;
          description = "The public key of the host. Will be null until generated on first rebuild";
        };
      };
    };
}