{
  description = "luochen570's NixOS configuration";

  inputs = {
    nixpkgs.url = "github:NixOS/nixpkgs/nixos-26.05";
    agent-nixpkgs.url = "tarball+https://mirrors.cernet.edu.cn/nix-channels/nixos-26.05/nixexprs.tar.xz";
    nixpkgs-unstable.url = "tarball+https://mirrors.cernet.edu.cn/nix-channels/nixos-unstable/nixexprs.tar.xz";
    # Exact revisions of the source archives previously used on agent.
    hermes-agent.url = "github:NousResearch/hermes-agent/3f2afed3eb813cb00bd381d29b084d0e01de048f";
    omp.url = "github:can1357/oh-my-pi/08542ed0df02ecaa78aaab28388aa6a563045f16";
    herdr-nix = {
      url = "github:herdrdev/herdr-nix";
      inputs.nixpkgs.follows = "nixpkgs";
    };

    home-manager = {
      url = "github:nix-community/home-manager/release-26.05";
      inputs.nixpkgs.follows = "nixpkgs";
    };

    # Nix4NvChad
    nix4nvchad = {
      url = "github:nix-community/nix4nvchad";
      inputs.nixpkgs.follows = "nixpkgs";
    };
    # Keep the agent VM on its currently installed NvChad module revision.
    agent-nix4nvchad = {
      url = "github:nix-community/nix4nvchad/042bbb1be519d01c76d8c65b2e004212b5b706ad";
      inputs.nixpkgs.follows = "agent-nixpkgs";
    };

    # NixOS WSL
    nixos-wsl = {
      url = "github:nix-community/NixOS-WSL/main";
      inputs.nixpkgs.follows = "nixpkgs";
    };

    # VS Code Server
    vscode-server.url = "github:nix-community/nixos-vscode-server";

    # SOPS for Nix
    sops-nix = {
      url = "github:Mic92/sops-nix";
      inputs.nixpkgs.follows = "nixpkgs";
    };
  };

  outputs =
    inputs@{ nixpkgs, home-manager, ... }:
    let
      username = "luochen570";
      hosts = import ./lib/hosts.nix;
      mkConfiguredHost =
        hostname: cfg:
        (import ./lib/mkHost.nix {
          nixpkgs = if hostname == "agent" then inputs.agent-nixpkgs else nixpkgs;
          inherit home-manager inputs;
        })
          (
            {
              inherit hostname username;
            }
            // cfg
          );
    in
    {
      nixosConfigurations = nixpkgs.lib.mapAttrs mkConfiguredHost hosts;
    };
}