set up nix mcp server

modules/home-manager-modules/programs/vscode/claudeDev.nix

@@ -2,10 +2,27 @@
   lib,
   pkgs,
   config,
+  inputs,
   ...
 }: let
   pkgsRepositories = pkgs.nix-vscode-extensions.forVSCodeVersion config.programs.vscode.package.version;
   pkgsRepository = pkgsRepositories.open-vsx;
+
+  mcp-nixos = inputs.mcp-nixos.packages.${pkgs.stdenv.hostPlatform.system}.default;
+
+  anyProfileHasMcpNixos = lib.any (
+    profile:
+      profile.extraExtensions.claudeDev.enable
+      && profile.extraExtensions.claudeDev.mcp.nixos.enable
+  ) (lib.attrValues config.programs.vscode.profiles);
+
+  mcpServersConfig = lib.mkMerge [
+    (lib.mkIf anyProfileHasMcpNixos {
+      nixos = {
+        command = "${mcp-nixos}/bin/mcp-nixos";
+      };
+    })
+  ];
 in {
   options.programs.vscode.profiles = lib.mkOption {
     type = lib.types.attrsOf (lib.types.submodule ({config, ...}: {
@@ -15,6 +32,12 @@ in {
           extension = lib.mkPackageOption pkgsRepository "claude-dev" {
             default = ["saoudrizwan" "claude-dev"];
           };
+
+          mcp = {
+            nixos = {
+              enable = lib.mkEnableOption "enable NixOS MCP server for Claude Dev";
+            };
+          };
         };
       };
       config = lib.mkIf config.extraExtensions.claudeDev.enable {
@@ -24,4 +47,17 @@ in {
       };
     }));
   };
+
+  config = lib.mkIf anyProfileHasMcpNixos {
+    home.file."${config.xdg.configHome}/VSCodium/User/globalStorage/saoudrizwan.claude-dev/settings/cline_mcp_settings.json" = {
+      text = builtins.toJSON {
+        mcpServers = mcpServersConfig;
+      };
+      force = true;
+    };
+
+    home.packages = [
+      mcp-nixos
+    ];
+  };
 }