diff --git a/03-di/01-notification-service/providers/NotificationService.ts b/03-di/01-notification-service/providers/NotificationService.ts
index a600a59..8188bde 100644
--- a/03-di/01-notification-service/providers/NotificationService.ts
+++ b/03-di/01-notification-service/providers/NotificationService.ts
@@ -1 +1,10 @@
-export class NotificationService {}
+import { Injectable } from "@nestjs/common";
+
+@Injectable()
+export class NotificationService {
+  constructor() {}
+
+  sendEmail(email: string, subject: string, message: string) {}
+
+  sendSMS(phone: string, message: string) {}
+}
diff --git a/03-di/01-notification-service/tasks/tasks.module.ts b/03-di/01-notification-service/tasks/tasks.module.ts
index 0f9774b..cbff700 100644
--- a/03-di/01-notification-service/tasks/tasks.module.ts
+++ b/03-di/01-notification-service/tasks/tasks.module.ts
@@ -7,6 +7,6 @@ import { NotificationService } from "../providers/NotificationService";
 @Module({
   imports: [],
   controllers: [TasksController],
-  providers: [TasksService],
+  providers: [TasksService, NotificationService],
 })
 export class TasksModule {}
diff --git a/03-di/01-notification-service/tasks/tasks.service.ts b/03-di/01-notification-service/tasks/tasks.service.ts
index 5c81948..f54c2a3 100644
--- a/03-di/01-notification-service/tasks/tasks.service.ts
+++ b/03-di/01-notification-service/tasks/tasks.service.ts
@@ -1,14 +1,24 @@
 import { Injectable, NotFoundException } from "@nestjs/common";
 import { CreateTaskDto, Task, TaskStatus, UpdateTaskDto } from "./task.model";
+import { NotificationService } from "../providers/NotificationService";
 
 @Injectable()
 export class TasksService {
   private tasks: Task[] = [];
 
-  constructor() {}
+  constructor(private readonly notificationService: NotificationService) {}
 
   async createTask(createTaskDto: CreateTaskDto) {
     const { title, description, assignedTo } = createTaskDto;
+
+    if (title && description && assignedTo) {
+      this.notificationService.sendEmail(
+        "user1@mail.com",
+        "Новая задача",
+        'Вы назначены ответственным за задачу: "New Task"',
+      );
+    }
+
     const task: Task = {
       id: (this.tasks.length + 1).toString(),
       title,
@@ -27,6 +37,13 @@ export class TasksService {
       throw new NotFoundException(`Задача с ID ${id} не найдена`);
     }
 
+    if (id && updateTaskDto.status === TaskStatus.Completed) {
+      this.notificationService.sendSMS(
+        "+987654321",
+        'Статус задачи "Existing Task" обновлён на "completed"',
+      );
+    }
+
     Object.assign(task, updateTaskDto);
     return task;
   }
diff --git a/package.json b/package.json
index 6290711..518bb2d 100644
--- a/package.json
+++ b/package.json
@@ -15,7 +15,9 @@
     "@nestjs/common": "^10.0.0",
     "@nestjs/core": "^10.0.0",
     "@nestjs/platform-express": "^10.0.0",
+    "@nestjs/swagger": "^8.1.0",
     "@nestjs/typeorm": "^10.0.2",
+    "class-validator": "^0.14.1",
     "reflect-metadata": "^0.2.0",
     "rxjs": "^7.8.1",
     "sqlite3": "^5.1.7",