{
  config,
  inputs,
  lib,
  pkgs,
  ...
}:
let
  packages = [
    pkgs.codex
    inputs.self.packages.${pkgs.system}.nixos-mcp
  ];
in
{
  options = {
    my.dev.mcp = {
      enable = lib.mkEnableOption "Install MCP tooling globally";
      users = lib.mkOption {
        type = inputs.self.lib.usersOptionType lib;
        default = config.my.toggleUsers.dev;
        description = "Users to install MCP packages for";
      };
    };
    devShells.mcp = lib.mkOption {
      type = lib.types.package;
      description = "MCP dev shell for this repo";
      default = pkgs.mkShell {
        inherit packages;
        name = "mcp-dev-shell";
        shellHook = ''
          export CODEX_HOME=$PWD/.codex
          echo "MCP shell ready: codex + nixos-mcp"
        '';
      };
    };
  };
  config = lib.mkIf config.my.dev.mcp.enable {
    users.users = inputs.self.lib.mkUserAttrs lib config.my.dev.mcp.users { inherit packages; };
  };
}