diff --git a/nix/darwin.nix b/nix/darwin.nix
index b3e09df..c6305e1 100644
--- a/nix/darwin.nix
+++ b/nix/darwin.nix
@@ -1,4 +1,4 @@
-{ self, pkgs, pkgs-unstable, ... }: {
+{ self, lib, pkgs, pkgs-unstable, ... }: {
   # List packages installed in system profile. To search by name, run:
   # $ nix-env -qaP | grep wget
   environment.systemPackages =
@@ -54,12 +54,13 @@
     # reference: https://gist.github.com/echo-dave/0d1ee6951c4e3bf00d738e84868e7d59
     ssh-use-keychain = {
       serviceConfig = {
-        Label = "sshusekeychain";
-        ProgramArguments = [ "bash" "-c" "ssh-add" "--apple-load-keychain" ];
+        Label = "me.boltless.usekeychain";
+        # ProgramArguments = [ "bash" "-c" "ssh-add" "--apple-load-keychain" ];
+        ProgramArguments = [ "/bin/echo" "hello" ];
         RunAtLoad = true;
         KeepAlive = false;
         StandardOutPath = "/var/log/usekeychain.log";
-        StandardErrorPath = "/var/log/usekeychain.log";
+        StandardErrorPath = "/var/log/usekeychain.err";
       };
     };
   };
@@ -74,9 +75,9 @@
 
   nix.linux-builder = {
     enable = true;
-    maxJobs = 6;
+    maxJobs = lib.mkDefault 4;
     config.virtualisation = {
-      cores = 8;
+      cores = lib.mkDefault 6;
     };
   };
 
diff --git a/nix/flake.nix b/nix/flake.nix
index 028db78..007b1cf 100644
--- a/nix/flake.nix
+++ b/nix/flake.nix
@@ -32,8 +32,8 @@
   in
   {
     # Build darwin flake using:
-    # $ darwin-rebuild build --flake ~/.config/nix
-    # $ darwin-rebuild switch --flake ~/.config/nix
+    # $ sudo darwin-rebuild build --flake ~/.config/nix
+    # $ sudo darwin-rebuild switch --flake ~/.config/nix
     darwinConfigurations."boltless-MacBook-Air" = nix-darwin.lib.darwinSystem {
       modules = [
         ./darwin.nix
@@ -45,6 +45,10 @@
     darwinConfigurations."boltless-Studio" = nix-darwin.lib.darwinSystem {
       modules = [
         ./darwin.nix
+        # ({ lib, ... }: {
+        #   nix.linux-builder.maxJobs = 6;
+        #   nix.linux-builder.config.virtualisation.cores = 8;
+        # })
       ];
       specialArgs = {
         inherit self pkgs-unstable;
@@ -79,7 +83,7 @@
         pkgs.mprocs
         pkgs.nil
         pkgs.nixfmt-classic
-        pkgs.nodejs_24
+        pkgs.nodejs_20
         pkgs.pandoc
         pkgs.qmk
         pkgs.ripgrep
@@ -91,6 +95,7 @@
         pkgs.typst
         pkgs.unixtools.watch
         pkgs.vim
+        pkgs.pnpm
         pkgs.zellij
         pkgs.llvmPackages.clang-tools
         pkgs-unstable.jujutsu