{
  description = "hyperhive — multi-Claude-Code-agent orchestration on nixos-containers";

  inputs = {
    nixpkgs.url = "github:NixOS/nixpkgs/nixos-25.11";
    treefmt-nix = {
      url = "github:numtide/treefmt-nix";
      inputs.nixpkgs.follows = "nixpkgs";
    };
  };

  outputs =
    inputs@{
      self,
      nixpkgs,
      treefmt-nix,
    }:
    let
      inherit (nixpkgs) lib;
      systems = [
        "aarch64-linux"
        "x86_64-linux"
      ];
      treefmt-config = {
        projectRootFile = "flake.nix";
        programs = {
          keep-sorted.enable = true;
          nixfmt.enable = true;
          rustfmt.enable = true;
        };
      };
      forAllSystems =
        f:
        lib.genAttrs systems (
          system:
          f rec {
            inherit system;
            pkgs = nixpkgs.legacyPackages.${system};
            treefmt-eval = treefmt-nix.lib.evalModule pkgs treefmt-config;
          }
        );
    in
    {
      devShells = forAllSystems (
        { pkgs, ... }:
        {
          default = pkgs.mkShell {
            packages = with pkgs; [
              cargo
              clippy
              pkg-config
              rust-analyzer
              rustc
              rustfmt
            ];
          };
        }
      );

      formatter = forAllSystems ({ treefmt-eval, ... }: treefmt-eval.config.build.wrapper);

      checks = forAllSystems (
        { treefmt-eval, ... }:
        {
          formatting = treefmt-eval.config.build.check self;
        }
      );
    };
}