diff --git a/.env.example b/.env.example
index ae0e0c3..654deba 100644
--- a/.env.example
+++ b/.env.example
@@ -75,3 +75,6 @@ PADDLE_PRICE_PRO_YEARLY=
 
 VITE_PADDLE_PRICE_PRO_MONTHLY="${PADDLE_PRICE_PRO_MONTHLY}"
 VITE_PADDLE_PRICE_PRO_YEARLY="${PADDLE_PRICE_PRO_YEARLY}"
+
+OPENROUTER_API_KEY=
+OPENROUTER_MODEL=nvidia/nemotron-3-super-120b-a12b:free
diff --git a/app/Observers/ThemeObserver.php b/app/Observers/ThemeObserver.php
index 43fba32..cc60282 100644
--- a/app/Observers/ThemeObserver.php
+++ b/app/Observers/ThemeObserver.php
@@ -3,6 +3,7 @@
 namespace App\Observers;
 
 use App\Models\Theme;
+use App\Services\AiService;
 use Illuminate\Support\Str;
 
 class ThemeObserver
@@ -12,5 +13,13 @@ public function creating(Theme $theme): void
         if (! $theme->title) {
             $theme->title = Str::headline($theme->name);
         }
+
+        if (! $theme->description) {
+            $ai = app(AiService::class);
+            $theme->description = $ai->generateThemeDescription(
+                $theme->name,
+                $theme->vars_light ?? []
+            );
+        }
     }
 }
diff --git a/app/Services/AiService.php b/app/Services/AiService.php
new file mode 100644
index 0000000..7d5cb16
--- /dev/null
+++ b/app/Services/AiService.php
@@ -0,0 +1,45 @@
+<?php
+
+namespace App\Services;
+
+use Illuminate\Support\Facades\Http;
+
+class AiService
+{
+    public function generateThemeDescription(string $name, array $colors): ?string
+    {
+        $apiKey = config('services.openrouter.key');
+
+        if (! $apiKey) {
+            return null;
+        }
+
+        $colorList = collect($colors)
+            ->map(fn ($value, $key) => "{$key}: {$value}")
+            ->implode(', ');
+
+        $prompt = "Generate a short, engaging description (max 2 sentences) for a UI theme named \"{$name}\" that uses these colors: {$colorList}. The description should highlight the mood or style of the theme.";
+
+        $response = Http::withHeaders([
+            'Authorization' => 'Bearer '.$apiKey,
+            'HTTP-Referer' => config('app.url'),
+            'X-Title' => config('app.name'),
+        ])->post('https://openrouter.ai/api/v1/chat/completions', [
+            'model' => config('services.openrouter.model'),
+            'messages' => [
+                [
+                    'role' => 'user',
+                    'content' => $prompt,
+                ],
+            ],
+        ]);
+
+        if ($response->failed()) {
+            return null;
+        }
+
+        $data = $response->json();
+
+        return $data['choices'][0]['message']['content'] ?? null;
+    }
+}
diff --git a/config/services.php b/config/services.php
index b8ced15..5c87866 100644
--- a/config/services.php
+++ b/config/services.php
@@ -46,4 +46,9 @@
         'redirect' => env('GOOGLE_REDIRECT_URI'),
     ],
 
+    'openrouter' => [
+        'key' => env('OPENROUTER_API_KEY'),
+        'model' => env('OPENROUTER_MODEL', 'nvidia/nemotron-3-super-120b-a12b:free'),
+    ],
+
 ];
diff --git a/tests/Feature/AiDescriptionTest.php b/tests/Feature/AiDescriptionTest.php
new file mode 100644
index 0000000..5615d9c
--- /dev/null
+++ b/tests/Feature/AiDescriptionTest.php
@@ -0,0 +1,51 @@
+<?php
+
+namespace Tests\Feature;
+
+use App\Models\User;
+use App\Services\AiService;
+use Illuminate\Foundation\Testing\RefreshDatabase;
+use Illuminate\Support\Facades\Http;
+use Tests\TestCase;
+
+class AiDescriptionTest extends TestCase
+{
+    use RefreshDatabase;
+
+    public function test_it_generates_description_on_theme_creation()
+    {
+        Http::fake([
+            'https://openrouter.ai/*' => Http::response([
+                'choices' => [
+                    [
+                        'message' => [
+                            'content' => 'A beautiful dark theme with neon accents.'
+                        ]
+                    ]
+                ]
+            ], 200),
+            'https://example.com/theme.json' => Http::response([
+                'name' => 'neon-dark',
+                'cssVars' => [
+                    'light' => [
+                        'background' => '0 0% 100%',
+                        'foreground' => '222.2 84% 4.9%',
+                    ],
+                ],
+            ], 200),
+        ]);
+
+        config(['services.openrouter.key' => 'test-key']);
+
+        $user = User::factory()->create();
+
+        $response = $this->actingAs($user)->post(route('themes.store'), [
+            'url' => 'https://example.com/theme.json',
+        ]);
+
+        $this->assertDatabaseHas('themes', [
+            'name' => 'neon-dark',
+            'description' => 'A beautiful dark theme with neon accents.',
+        ]);
+    }
+}