diff --git a/main.tf b/main.tf
index 7185fcc..da359cc 100644
--- a/main.tf
+++ b/main.tf
@@ -55,7 +55,7 @@ resource "google_project_service" "services" {
 
 # generativelanguage.googleapis.com is designed for experimentation only. A low initial quota
 # is set to protect the project. To use Gemini AI in a production environment, migrate to Vertex AI in
-# Firebase. See prod.tf for more details.
+# Firebase. See prod.tf.example for more details.
 resource "google_service_usage_consumer_quota_override" "generativelanguage" {
   project        = var.project
   service        = "generativelanguage.googleapis.com"
@@ -149,7 +149,7 @@ resource "local_file" "environment_ts" {
     {
       project_id     = data.google_project.project.project_id,
       gemini_api_key = google_apikeys_key.generativelanguage.key_string,
-      debug_token    = "" # Use local.uuid4 in when using Vertex AI in Firebase
+      debug_token    = "" # TODO: Use local.uuid4 in when using Vertex AI in Firebase
     }
   ))
   filename = "${path.module}/src/environments/environments.ts"
diff --git a/src/app/app.config.ts b/src/app/app.config.ts
index 405f20f..e1113a1 100644
--- a/src/app/app.config.ts
+++ b/src/app/app.config.ts
@@ -16,11 +16,12 @@
 
 import { ApplicationConfig, provideZoneChangeDetection } from '@angular/core';
 import { initializeApp, provideFirebaseApp, getApp } from '@angular/fire/app';
-import {
-  ReCaptchaEnterpriseProvider,
-  initializeAppCheck,
-  provideAppCheck,
-} from '@angular/fire/app-check';
+// TODO: Recommended to use together with Vertex AI
+// import {
+//   ReCaptchaEnterpriseProvider,
+//   initializeAppCheck,
+//   provideAppCheck,
+// } from '@angular/fire/app-check';
 import { getAuth, provideAuth } from '@angular/fire/auth';
 import { initializeFirestore, persistentLocalCache, persistentMultipleTabManager, provideFirestore } from '@angular/fire/firestore';
 import { environment } from '../environments/environments';
@@ -36,6 +37,7 @@ export const appConfig: ApplicationConfig = {
     provideFirebaseApp(() =>
       initializeApp(environment.firebase), 
     ),
+    // TODO
     // Turn on app check for Vertex AI in Firebase
     // provideAppCheck(() => {
       // TODO: don't use debug token in prod
diff --git a/src/app/services/task.service.ts b/src/app/services/task.service.ts
index d95c38b..b5992ab 100644
--- a/src/app/services/task.service.ts
+++ b/src/app/services/task.service.ts
@@ -44,7 +44,8 @@ import { GoogleGenerativeAIFetchError } from '@google/generative-ai';
 import { v4 as uuidv4 } from 'uuid';
 import { GoogleGenerativeAI } from '@google/generative-ai';
 import { environment } from '../../environments/environments';
-import { getVertexAI, getGenerativeModel } from 'firebase/vertexai-preview';
+// TODO: import Vertex AI
+// import { getVertexAI, getGenerativeModel } from 'firebase/vertexai-preview';
 
 type Priority = 'none' | 'low' | 'medium' | 'high';
 
@@ -87,10 +88,11 @@ export class TaskService {
   private firestore = inject(Firestore);
   private auth = inject(Auth);
 
-  private vertexAI = getVertexAI(getApp());
+  // TODO: Use Vertex AI
+  // private vertexAI = getVertexAI(getApp());
   // Caveat: the VertexAI model may take a while (~10s) to initialize after your
   // first call to GenerateContent(). You may see a PERMISSION_DENIED error before then.
-  private prodModel = getGenerativeModel(this.vertexAI, MODEL_CONFIG);
+  // private prodModel = getGenerativeModel(this.vertexAI, MODEL_CONFIG);
 
   private genAI = new GoogleGenerativeAI(environment.gemini_api_key);
   private experimentModel = this.genAI.getGenerativeModel(MODEL_CONFIG);