Failed installing nixd in my flake system

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Just getting started on using a flake.nix for my nixos system. I couldn’t figure out how to pass the flake in to be used by configuration.nix so I made it an argument. This is what I have (my-nixd is the new part):

{
  description = "BB-5520";

  inputs = {
    nixpkgs = { url = "github:nixos/nixpkgs/nixos-23.05"; };
    nixos = { url = "github:nixos/nixpkgs/nixos-23.05"; };
    my-nixd = { url = "github:nix-community/nixd"; };
  };

  outputs = inputs:
  {
    nixosConfigurations = {

      BB-5520 = inputs.nixpkgs.lib.nixosSystem {
        system = "x86_64-linux";
        modules = [
          (import ./configuration.nix inputs.my-nixd)
        ];
        specialArgs = { inherit inputs; };
      };
    };
  };
}

Then in my configuration.nix I have my-nixd as an argument:

my-nixd:

{ config, pkgs, lib, ... }:

{
  imports =

and then my-nixd is in my environment.systemPackages.

nixos-rebuild --switch succeeds, but I don’t get a nixd binary. ls /nix/store | grep nixd reveals nothing.

I’m still hazy on how specialArgs is supposed to work. Here it supposedly contains all the inputs which includes my-nixd, but I couldn’t figure out how to access it from configuration.nix.