Adding custom commands to $PATH

I want to add custom commands to my PATH but am unable to get it working. So far I've installed home-manager and added the code below to my nix configuration.

imports = [
  ./hardware-configuration.nix
  
];

Then later on to add the item to PATH

home-manager.users.curtismchale = { pkgs, ... }: {
  home.stateVersion = "23.05";
  home.sessionPath = [
    "$HOME/Workspace/proudcity/proudcity-kubernetes/bin"
  ];
};

I have also tried $HOME/Workspace/proudcity/producity-kubernetes/bin/pc-kube but that doesn't change the issue.

I can see the commands installed at ~/Workspace/proudcity/proudcity-kubernetes/bin/pc-kube but when I type the expected command pc kube $command it says there is nothing installed in path and offers to install some programs that match pc for me.