diff --git a/flake.nix b/flake.nix
index 598e21c..09b1bb2 100644
--- a/flake.nix
+++ b/flake.nix
@@ -15,6 +15,15 @@
           packages = [
             pkgs.nodejs_24
           ];
+          shellHook = ''
+            if [ -n "''${PS1-}" ]; then
+              if [ -n "''${QX_DEV_SHELL_PROMPT-}" ]; then
+                PS1="''${PS1#\[qx:''${QX_DEV_SHELL_PROMPT}\] }"
+              fi
+              export QX_DEV_SHELL_PROMPT="control-plane-protocol"
+              PS1="[qx:control-plane-protocol] $PS1"
+            fi
+          '';
         };
       });
 }