{
  description = "Emacs mode development environment";

  inputs = {
    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
    flake-utils.url = "github:numtide/flake-utils";
    jailed-agents.url = "path:/conf/jailed-agents";
  };

  outputs =
    { self, nixpkgs, flake-utils, jailed-agents, ... }:
    flake-utils.lib.eachDefaultSystem (system:
      let
        pkgs = nixpkgs.legacyPackages.${system};

        # Choose your Emacs build (e.g., pkgs.emacs, pkgs.emacs-nox, pkgs.emacs-pgtk)
        epkgs = pkgs.emacsPackagesFor pkgs.emacs;

        # Emacs wrapped with useful dev/test/lint packages available in load-path
        emacsWithDeps = epkgs.emacsWithPackages (p: with p; [
          package-lint
          relint
          buttercup
        ]);

        devInputs = with pkgs; [
          emacsWithDeps
          epkgs.eldev
          git
          gnumake
          texinfo
          ripgrep
        ];
      in
      {
        devShells.default = pkgs.mkShell {
          packages = devInputs ++ [
            (jailed-agents.lib.${system}.makeJailedOpencode system {
              extraPkgs = devInputs;
            })
          ];

          shellHook = ''
            echo "━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━"
            echo "  Emacs Mode Development Environment"
            echo "━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━"
            echo ""
            echo "Common tasks:"
            echo "  eldev lint        # package-lint + relint"
            echo "  eldev test        # run ERT/Buttercup tests"
            echo "  eldev compile     # byte-compile"
            echo "  eldev package     # build release tarball"
            echo ""
            echo "Start Emacs (preconfigured load-path):"
            echo "  emacs ."
            echo "━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━"
          '';
        };
      }
    );
}