diff --git a/package-lock.json b/package-lock.json
index e2448b9..51c7c7f 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -47,6 +47,7 @@
         "@types/react-dom": "^19.2.3",
         "@vitejs/plugin-react": "^4.7.0",
         "concurrently": "^8.2.0",
+        "cross-env": "^10.1.0",
         "jest": "^29.7.0",
         "ts-jest": "^29.2.5",
         "tsx": "^4.19.2",
@@ -574,6 +575,13 @@
         "tslib": ">=2"
       }
     },
+    "node_modules/@epic-web/invariant": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/@epic-web/invariant/-/invariant-1.0.0.tgz",
+      "integrity": "sha512-lrTPqgvfFQtR/eY/qkIzp98OGdNJu0m5ji3q/nJI8v3SXkRKEnWiOxMmbvcSoAIzv/cGiuvRy57k4suKQSAdwA==",
+      "dev": true,
+      "license": "MIT"
+    },
     "node_modules/@esbuild/aix-ppc64": {
       "version": "0.27.1",
       "resolved": "https://registry.npmjs.org/@esbuild/aix-ppc64/-/aix-ppc64-0.27.1.tgz",
@@ -7940,6 +7948,24 @@
         "node": "^14.15.0 || ^16.10.0 || >=18.0.0"
       }
     },
+    "node_modules/cross-env": {
+      "version": "10.1.0",
+      "resolved": "https://registry.npmjs.org/cross-env/-/cross-env-10.1.0.tgz",
+      "integrity": "sha512-GsYosgnACZTADcmEyJctkJIoqAhHjttw7RsFrVoJNXbsWWqaq6Ym+7kZjq6mS45O0jij6vtiReppKQEtqWy6Dw==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@epic-web/invariant": "^1.0.0",
+        "cross-spawn": "^7.0.6"
+      },
+      "bin": {
+        "cross-env": "dist/bin/cross-env.js",
+        "cross-env-shell": "dist/bin/cross-env-shell.js"
+      },
+      "engines": {
+        "node": ">=20"
+      }
+    },
     "node_modules/cross-spawn": {
       "version": "7.0.6",
       "resolved": "https://registry.npmjs.org/cross-spawn/-/cross-spawn-7.0.6.tgz",
diff --git a/package.json b/package.json
index 9b5feca..25bfc67 100644
--- a/package.json
+++ b/package.json
@@ -6,7 +6,7 @@
   "main": "dist/index.js",
   "scripts": {
     "dev": "tsx watch --inspect src/index.ts",
-    "dev:internal": "AUTH_MODE=internal tsx watch --inspect src/index.ts",
+    "dev:internal": "cross-env AUTH_MODE=internal tsx watch --inspect src/index.ts",
     "dev:external": "concurrently \"AUTH_MODE=auth_server PORT=3001 BASE_URI=http://localhost:3001 tsx watch src/index.ts\" \"sleep 3 && AUTH_MODE=external AUTH_SERVER_URL=http://localhost:3001 tsx watch --inspect src/index.ts\"",
     "build": "tsc && npm run copy-static && npm run build:apps",
     "build:apps": "INPUT=src/apps/hello-world/mcp-app.html vite build",
@@ -61,6 +61,7 @@
     "@types/react-dom": "^19.2.3",
     "@vitejs/plugin-react": "^4.7.0",
     "concurrently": "^8.2.0",
+    "cross-env": "^10.1.0",
     "jest": "^29.7.0",
     "ts-jest": "^29.2.5",
     "tsx": "^4.19.2",