diff --git a/templates/deepagents/streaming/{{cookiecutter.project_slug}}/frontend/vite.config.test.ts b/templates/deepagents/streaming/{{cookiecutter.project_slug}}/frontend/vite.config.test.ts
new file mode 100644
index 0000000..9b0a9e0
--- /dev/null
+++ b/templates/deepagents/streaming/{{cookiecutter.project_slug}}/frontend/vite.config.test.ts
@@ -0,0 +1,11 @@
+import { describe, expect, it } from "vitest";
+import type { UserConfig } from "vite";
+import viteConfig from "./vite.config.ts";
+
+const config = viteConfig as UserConfig;
+
+describe("vite server binding", () => {
+  it("binds the dev server to the lifecycle health-check address", () => {
+    expect(config.server?.host).toBe("127.0.0.1");
+  });
+});
diff --git a/templates/deepagents/streaming/{{cookiecutter.project_slug}}/frontend/vite.config.ts b/templates/deepagents/streaming/{{cookiecutter.project_slug}}/frontend/vite.config.ts
index 0a458dd..8746463 100644
--- a/templates/deepagents/streaming/{{cookiecutter.project_slug}}/frontend/vite.config.ts
+++ b/templates/deepagents/streaming/{{cookiecutter.project_slug}}/frontend/vite.config.ts
@@ -3,5 +3,5 @@ import react from "@vitejs/plugin-react";
 
 export default defineConfig({
   plugins: [react()],
-  server: { port: {{ cookiecutter.frontend_port }}, strictPort: true },
+  server: { host: "127.0.0.1", port: {{ cookiecutter.frontend_port }}, strictPort: true },
 });