Did you know about https://direnv.net/

It is a nice tool that activates nix flake dev shells when entering project directory.
Unfortunatelly it enters infinite loop when shellHook executes another inner zsh shell.

flake.nix

@@ -16,14 +16,9 @@
       name = "roo-code";
       
       packages = with pkgs; [
-        zsh
         nodejs_18
         corepack_18
       ];
-
-      shellHook = ''
-        exec zsh
-      '';
     };
   in {
     devShells = forAllSystems (system: {