diff --git a/app/app/Services/Bot/YandexGptClient.php b/app/app/Services/Bot/YandexGptClient.php
new file mode 100644
index 00000000..0fe77641
--- /dev/null
+++ b/app/app/Services/Bot/YandexGptClient.php
@@ -0,0 +1,51 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Services\Bot;
+
+use Illuminate\Support\Facades\Http;
+use Illuminate\Support\Facades\Log;
+
+/**
+ * YandexGPT Lite (Yandex Cloud Foundation Models) — мозг бота (протокол, решение 8).
+ * Возвращает null при любой беде (нет ключа, таймаут, 5xx) — решение об эскалации
+ * принимает вызывающий. Таймаут 8 сек — бюджет скорости из спеки §6.
+ */
+class YandexGptClient
+{
+    public function complete(string $systemPrompt, string $userText): ?string
+    {
+        $cfg = (array) config('services.yandexgpt');
+        if (($cfg['api_key'] ?? '') === '' || ($cfg['folder_id'] ?? '') === '') {
+            return null;
+        }
+
+        try {
+            $response = Http::timeout((int) ($cfg['timeout_seconds'] ?? 8))
+                ->withHeaders(['Authorization' => 'Api-Key '.$cfg['api_key']])
+                ->post((string) $cfg['endpoint'], [
+                    'modelUri' => sprintf('gpt://%s/%s', $cfg['folder_id'], $cfg['model']),
+                    'completionOptions' => ['stream' => false, 'temperature' => 0.2, 'maxTokens' => 500],
+                    'messages' => [
+                        ['role' => 'system', 'text' => $systemPrompt],
+                        ['role' => 'user', 'text' => $userText],
+                    ],
+                ]);
+
+            if (! $response->ok()) {
+                Log::warning('YandexGPT non-OK', ['status' => $response->status()]);
+
+                return null;
+            }
+
+            $text = $response->json('result.alternatives.0.message.text');
+
+            return is_string($text) && $text !== '' ? $text : null;
+        } catch (\Throwable $e) {
+            Log::warning('YandexGPT failure', ['error' => $e->getMessage()]);
+
+            return null;
+        }
+    }
+}
diff --git a/app/tests/Unit/Bot/YandexGptClientTest.php b/app/tests/Unit/Bot/YandexGptClientTest.php
new file mode 100644
index 00000000..3ac4d9d5
--- /dev/null
+++ b/app/tests/Unit/Bot/YandexGptClientTest.php
@@ -0,0 +1,47 @@
+<?php
+
+declare(strict_types=1);
+
+use App\Services\Bot\YandexGptClient;
+use Illuminate\Support\Facades\Http;
+
+uses(Tests\TestCase::class);
+
+beforeEach(function () {
+    config()->set('services.yandexgpt', [
+        'api_key' => 'test-key', 'folder_id' => 'b1gtest', 'model' => 'yandexgpt-lite/latest',
+        'endpoint' => 'https://llm.api.cloud.yandex.net/foundationModels/v1/completion',
+        'timeout_seconds' => 8,
+    ]);
+});
+
+it('шлёт правильный запрос и возвращает текст ответа', function () {
+    Http::fake([
+        'llm.api.cloud.yandex.net/*' => Http::response([
+            'result' => ['alternatives' => [['message' => ['role' => 'assistant', 'text' => 'Проект — это…']]]],
+        ]),
+    ]);
+
+    $text = app(YandexGptClient::class)->complete('системный наказ', 'что такое проект?');
+
+    expect($text)->toBe('Проект — это…');
+    Http::assertSent(function ($request) {
+        return $request->hasHeader('Authorization', 'Api-Key test-key')
+            && $request['modelUri'] === 'gpt://b1gtest/yandexgpt-lite/latest'
+            && $request['messages'][0]['role'] === 'system'
+            && $request['messages'][1]['role'] === 'user'
+            && $request['completionOptions']['temperature'] === 0.2;
+    });
+});
+
+it('пустой api_key → null (бот не настроен, не исключение)', function () {
+    config()->set('services.yandexgpt.api_key', '');
+
+    expect(app(YandexGptClient::class)->complete('s', 'u'))->toBeNull();
+});
+
+it('ошибка API → null (эскалация решается выше)', function () {
+    Http::fake(['llm.api.cloud.yandex.net/*' => Http::response('err', 500)]);
+
+    expect(app(YandexGptClient::class)->complete('s', 'u'))->toBeNull();
+});