diff --git a/app/Enums/PostPlatform/ContentType.php b/app/Enums/PostPlatform/ContentType.php
index b9338bc9..936337cc 100644
--- a/app/Enums/PostPlatform/ContentType.php
+++ b/app/Enums/PostPlatform/ContentType.php
@@ -179,6 +179,32 @@ public function maxMediaCount(): int
         };
     }
 
+    /**
+     * Maximum video duration in seconds for this content type, when the
+     * platform publishes a hard cap via API. Null when unlimited, unknown,
+     * or enforced dynamically (e.g. TikTok creator_info).
+     *
+     * Mirrors resources/js/composables/useMediaRules.ts.
+     */
+    public function maxVideoDurationSec(): ?int
+    {
+        return match ($this) {
+            self::InstagramFeed => 60,
+            self::InstagramReel => 15 * 60,
+            self::InstagramStory => 60,
+            self::FacebookPost => 240 * 60,
+            self::FacebookReel => 90,
+            self::FacebookStory => 60,
+            self::LinkedInPost, self::LinkedInPagePost => 10 * 60,
+            self::YouTubeShort => 3 * 60,
+            self::PinterestVideoPin => 15 * 60,
+            self::XPost => 140,
+            self::ThreadsPost => 5 * 60,
+            self::BlueskyPost => 60,
+            default => null,
+        };
+    }
+
     public function supportsVideo(): bool
     {
         return match ($this) {
diff --git a/app/Http/Resources/Api/PlatformContentTypesResource.php b/app/Http/Resources/Api/PlatformContentTypesResource.php
index 1082de9f..0d9132cb 100644
--- a/app/Http/Resources/Api/PlatformContentTypesResource.php
+++ b/app/Http/Resources/Api/PlatformContentTypesResource.php
@@ -42,6 +42,7 @@ public function toArray(Request $request): array
                     'description' => $type->description(),
                     'max_media_count' => $type->maxMediaCount(),
                     'requires_media' => $type->requiresMedia(),
+                    'max_video_duration_sec' => $type->maxVideoDurationSec(),
                 ],
                 array_values(ContentType::forPlatform($platform)),
             ),
diff --git a/app/Mcp/Tools/Platform/ListContentTypesTool.php b/app/Mcp/Tools/Platform/ListContentTypesTool.php
index a7b3b632..e240f3a2 100644
--- a/app/Mcp/Tools/Platform/ListContentTypesTool.php
+++ b/app/Mcp/Tools/Platform/ListContentTypesTool.php
@@ -14,7 +14,7 @@
 use Laravel\Mcp\Server\Tools\Annotations\IsReadOnly;
 
 #[IsReadOnly]
-#[Description('List the valid content_types per social platform plus their constraints (max content length, recommended length, max media count, whether media is required, default content_type). Use before create-post-tool / update-post-tool to know which content_type to set.')]
+#[Description('List the valid content_types per social platform plus their constraints (max content length, recommended length, max media count, whether media is required, max video duration in seconds, default content_type). Use before create-post-tool / update-post-tool to know which content_type to set.')]
 class ListContentTypesTool extends Tool
 {
     public function handle(Request $request): ResponseFactory
@@ -29,6 +29,7 @@ public function handle(Request $request): ResponseFactory
                     'description' => $type->description(),
                     'max_media_count' => $type->maxMediaCount(),
                     'requires_media' => $type->requiresMedia(),
+                    'max_video_duration_sec' => $type->maxVideoDurationSec(),
                 ],
                 array_values(ContentType::forPlatform($platform)),
             );
diff --git a/app/Mcp/Tools/Post/RequestMediaUploadTool.php b/app/Mcp/Tools/Post/RequestMediaUploadTool.php
index 2b380e50..889f120f 100644
--- a/app/Mcp/Tools/Post/RequestMediaUploadTool.php
+++ b/app/Mcp/Tools/Post/RequestMediaUploadTool.php
@@ -14,7 +14,7 @@
 use Laravel\Mcp\Server\Attributes\Description;
 use Laravel\Mcp\Server\Tool;
 
-#[Description('Issue a one-shot signed POST URL that lets the user upload a local file (image, video, or PDF document, up to the workspace upload cap — 50 MB by default) directly to this workspace. Returns an upload_token and upload_url. Hand the URL to the user (e.g. as a curl command with `-F media=@path/to/file`) or to the MCP client. After upload, call AttachMediaFromUploadTool(post_id, upload_token) to attach the result to a post.')]
+#[Description('Issue a one-shot signed POST URL that lets the user upload a local file (image, video, or PDF document, up to the workspace upload cap — 300 MB by default) directly to this workspace. Returns an upload_token and upload_url. Hand the URL to the user (e.g. as a curl command with `-F media=@path/to/file`) or to the MCP client. After upload, call AttachMediaFromUploadTool(post_id, upload_token) to attach the result to a post.')]
 class RequestMediaUploadTool extends Tool
 {
     public function handle(Request $request): Response|ResponseFactory
diff --git a/app/Providers/AppServiceProvider.php b/app/Providers/AppServiceProvider.php
index 960c0244..10c739ad 100644
--- a/app/Providers/AppServiceProvider.php
+++ b/app/Providers/AppServiceProvider.php
@@ -159,6 +159,17 @@ protected function configureRateLimiting(): void
 
             return Limit::perMinute(60)->by($request->workspace?->id ?: $request->ip());
         });
+
+        // MCP signed uploads arrive from ChatGPT's shared egress IPs. Key by
+        // workspace_id (bound into the signed URL) so tenants don't share a bucket.
+        RateLimiter::for('mcp-uploads', function (Request $request) {
+            $workspaceId = (string) $request->query('workspace_id');
+
+            return [
+                Limit::perMinute(60)->by('workspace:'.$workspaceId),
+                Limit::perMinute(600)->by('ip:'.$request->ip()),
+            ];
+        });
     }
 
     protected function configureStripeWebhooks(): void
diff --git a/config/ai.php b/config/ai.php
index c28a3160..0034ca58 100644
--- a/config/ai.php
+++ b/config/ai.php
@@ -53,7 +53,7 @@
 
     'mcp' => [
         'upload' => [
-            'max_size_mb' => (int) env('MCP_UPLOAD_MAX_SIZE_MB', 50),
+            'max_size_mb' => (int) env('MCP_UPLOAD_MAX_SIZE_MB', 300),
             'url_ttl_minutes' => (int) env('MCP_UPLOAD_URL_TTL_MINUTES', 15),
         ],
     ],
diff --git a/lang/ar/posts.php b/lang/ar/posts.php
index 03d07a14..8d5901e5 100644
--- a/lang/ar/posts.php
+++ b/lang/ar/posts.php
@@ -464,7 +464,7 @@
         ],
         'instagram_reel' => [
             'label' => 'ريل',
-            'description' => 'فيديو قصير حتى 90 ثانية',
+            'description' => 'فيديو قصير حتى 15 دقيقة',
         ],
         'instagram_story' => [
             'label' => 'قصة',
diff --git a/lang/de/posts.php b/lang/de/posts.php
index f876ef0e..0aeef2b4 100644
--- a/lang/de/posts.php
+++ b/lang/de/posts.php
@@ -466,7 +466,7 @@
         ],
         'instagram_reel' => [
             'label' => 'Reel',
-            'description' => 'Kurzes Video bis zu 90 Sekunden',
+            'description' => 'Kurzes Video bis zu 15 Minuten',
         ],
         'instagram_story' => [
             'label' => 'Story',
diff --git a/lang/el/posts.php b/lang/el/posts.php
index 975fbdae..470ff022 100644
--- a/lang/el/posts.php
+++ b/lang/el/posts.php
@@ -464,7 +464,7 @@
         ],
         'instagram_reel' => [
             'label' => 'Reel',
-            'description' => 'Σύντομο βίντεο έως 90 δευτερόλεπτα',
+            'description' => 'Σύντομο βίντεο έως 15 λεπτά',
         ],
         'instagram_story' => [
             'label' => 'Story',
diff --git a/lang/en/posts.php b/lang/en/posts.php
index dde76013..f15f8f15 100644
--- a/lang/en/posts.php
+++ b/lang/en/posts.php
@@ -464,7 +464,7 @@
         ],
         'instagram_reel' => [
             'label' => 'Reel',
-            'description' => 'Short video up to 90 seconds',
+            'description' => 'Short video up to 15 minutes',
         ],
         'instagram_story' => [
             'label' => 'Story',
diff --git a/lang/es/posts.php b/lang/es/posts.php
index 6f53b10f..61b04344 100644
--- a/lang/es/posts.php
+++ b/lang/es/posts.php
@@ -464,7 +464,7 @@
         ],
         'instagram_reel' => [
             'label' => 'Reel',
-            'description' => 'Video corto de hasta 90 segundos',
+            'description' => 'Video corto de hasta 15 minutos',
         ],
         'instagram_story' => [
             'label' => 'Historia',
diff --git a/lang/fr/posts.php b/lang/fr/posts.php
index 2887da40..7cbd880e 100644
--- a/lang/fr/posts.php
+++ b/lang/fr/posts.php
@@ -464,7 +464,7 @@
         ],
         'instagram_reel' => [
             'label' => 'Reel',
-            'description' => 'Courte vidéo jusqu\'à 90 secondes',
+            'description' => 'Courte vidéo jusqu\'à 15 minutes',
         ],
         'instagram_story' => [
             'label' => 'Story',
diff --git a/lang/it/posts.php b/lang/it/posts.php
index 6baf9996..ea9ca8de 100644
--- a/lang/it/posts.php
+++ b/lang/it/posts.php
@@ -464,7 +464,7 @@
         ],
         'instagram_reel' => [
             'label' => 'Reel',
-            'description' => 'Video breve fino a 90 secondi',
+            'description' => 'Video breve fino a 15 minuti',
         ],
         'instagram_story' => [
             'label' => 'Storia',
diff --git a/lang/ja/posts.php b/lang/ja/posts.php
index 352e6ddd..4c205ec4 100644
--- a/lang/ja/posts.php
+++ b/lang/ja/posts.php
@@ -464,7 +464,7 @@
         ],
         'instagram_reel' => [
             'label' => 'リール',
-            'description' => '最大 90 秒のショート動画',
+            'description' => '最大 15 分のショート動画',
         ],
         'instagram_story' => [
             'label' => 'ストーリー',
diff --git a/lang/ko/posts.php b/lang/ko/posts.php
index 86f1f1ab..2e58a2e7 100644
--- a/lang/ko/posts.php
+++ b/lang/ko/posts.php
@@ -464,7 +464,7 @@
         ],
         'instagram_reel' => [
             'label' => '릴스',
-            'description' => '최대 90초 짧은 동영상',
+            'description' => '최대 15분 짧은 동영상',
         ],
         'instagram_story' => [
             'label' => '스토리',
diff --git a/lang/nl/posts.php b/lang/nl/posts.php
index 75a6af89..f13035b5 100644
--- a/lang/nl/posts.php
+++ b/lang/nl/posts.php
@@ -464,7 +464,7 @@
         ],
         'instagram_reel' => [
             'label' => 'Reel',
-            'description' => 'Korte video tot 90 seconden',
+            'description' => 'Korte video tot 15 minuten',
         ],
         'instagram_story' => [
             'label' => 'Story',
diff --git a/lang/pl/posts.php b/lang/pl/posts.php
index c30419ec..3af64e34 100644
--- a/lang/pl/posts.php
+++ b/lang/pl/posts.php
@@ -464,7 +464,7 @@
         ],
         'instagram_reel' => [
             'label' => 'Rolka',
-            'description' => 'Krótki film do 90 sekund',
+            'description' => 'Krótki film do 15 minut',
         ],
         'instagram_story' => [
             'label' => 'Relacja',
diff --git a/lang/pt-BR/posts.php b/lang/pt-BR/posts.php
index 51359954..d7d8856a 100644
--- a/lang/pt-BR/posts.php
+++ b/lang/pt-BR/posts.php
@@ -464,7 +464,7 @@
         ],
         'instagram_reel' => [
             'label' => 'Reels',
-            'description' => 'Vídeo curto de até 90 segundos',
+            'description' => 'Vídeo curto de até 15 minutos',
         ],
         'instagram_story' => [
             'label' => 'Story',
diff --git a/lang/ru/posts.php b/lang/ru/posts.php
index c97df56c..c180e074 100644
--- a/lang/ru/posts.php
+++ b/lang/ru/posts.php
@@ -464,7 +464,7 @@
         ],
         'instagram_reel' => [
             'label' => 'Reels',
-            'description' => 'Короткое видео до 90 секунд',
+            'description' => 'Короткое видео до 15 минут',
         ],
         'instagram_story' => [
             'label' => 'История',
diff --git a/lang/tr/posts.php b/lang/tr/posts.php
index 59007cc6..2babf59f 100644
--- a/lang/tr/posts.php
+++ b/lang/tr/posts.php
@@ -466,7 +466,7 @@
         ],
         'instagram_reel' => [
             'label' => 'Reel',
-            'description' => '90 saniyeye kadar kısa video',
+            'description' => '15 dakikaya kadar kısa video',
         ],
         'instagram_story' => [
             'label' => 'Hikaye',
diff --git a/lang/zh/posts.php b/lang/zh/posts.php
index fc5d3cb3..0fec3de5 100644
--- a/lang/zh/posts.php
+++ b/lang/zh/posts.php
@@ -464,7 +464,7 @@
         ],
         'instagram_reel' => [
             'label' => 'Reel',
-            'description' => '最长 90 秒的短视频',
+            'description' => '最长 15 分钟的短视频',
         ],
         'instagram_story' => [
             'label' => '快拍',
diff --git a/routes/api.php b/routes/api.php
index fe3c48f1..9c603e79 100644
--- a/routes/api.php
+++ b/routes/api.php
@@ -13,7 +13,7 @@
 use Illuminate\Support\Facades\Route;
 
 Route::post('/uploads/{token}', [UploadController::class, 'store'])
-    ->middleware(['signed', 'throttle:10,1'])
+    ->middleware(['signed', 'throttle:mcp-uploads'])
     ->where('token', '[0-9a-f-]{36}')
     ->name('api.uploads.store');
 
diff --git a/tests/Feature/Api/PlatformApiTest.php b/tests/Feature/Api/PlatformApiTest.php
index 204253c6..954229b7 100644
--- a/tests/Feature/Api/PlatformApiTest.php
+++ b/tests/Feature/Api/PlatformApiTest.php
@@ -10,7 +10,7 @@
 });
 
 it('lists content types per platform', function () {
-    $this->withHeaders(['Authorization' => 'Bearer '.$this->plainToken])
+    $response = $this->withHeaders(['Authorization' => 'Bearer '.$this->plainToken])
         ->getJson(route('api.content-types'))
         ->assertOk()
         ->assertJsonStructure([
@@ -23,11 +23,25 @@
                     'allowed_media_types',
                     'default_content_type',
                     'content_types' => [
-                        '*' => ['value', 'label', 'description', 'max_media_count', 'requires_media'],
+                        '*' => [
+                            'value',
+                            'label',
+                            'description',
+                            'max_media_count',
+                            'requires_media',
+                            'max_video_duration_sec',
+                        ],
                     ],
                 ],
             ],
         ]);
+
+    $platforms = collect($response->json('platforms'));
+    $instagramTypes = collect($platforms->firstWhere('platform', 'instagram')['content_types']);
+    $facebookTypes = collect($platforms->firstWhere('platform', 'facebook')['content_types']);
+
+    expect($instagramTypes->firstWhere('value', 'instagram_reel')['max_video_duration_sec'])->toBe(900);
+    expect($facebookTypes->firstWhere('value', 'facebook_reel')['max_video_duration_sec'])->toBe(90);
 });
 
 it('rejects content-types without auth', function () {
diff --git a/tests/Feature/Api/UploadControllerTest.php b/tests/Feature/Api/UploadControllerTest.php
index ac69900e..fc0969d1 100644
--- a/tests/Feature/Api/UploadControllerTest.php
+++ b/tests/Feature/Api/UploadControllerTest.php
@@ -102,9 +102,11 @@ function signedUploadUrl(Workspace $ws, string $token, ?int $expiresInMinutes =
     expect(Media::where('upload_token', $token)->count())->toBe(1);
 });
 
-test('rejects file larger than 50MB', function () {
+test('rejects file larger than the MCP upload cap', function () {
+    config(['ai.mcp.upload.max_size_mb' => 1]);
+
     $token = (string) Str::uuid();
-    $file = UploadedFile::fake()->create('huge.mp4', 51 * 1024 + 1, 'video/mp4');
+    $file = UploadedFile::fake()->create('huge.mp4', 1024 + 1, 'video/mp4');
 
     $response = $this->postJson(signedUploadUrl($this->workspace, $token), ['media' => $file]);
 
@@ -122,18 +124,37 @@ function signedUploadUrl(Workspace $ws, string $token, ?int $expiresInMinutes =
     expect(Media::where('upload_token', $token)->exists())->toBeFalse();
 });
 
-test('rate limits floods from the same IP', function () {
-    for ($i = 0; $i < 10; $i++) {
+test('rate limits floods from the same workspace', function () {
+    for ($i = 0; $i < 60; $i++) {
         $this->postJson(
             signedUploadUrl($this->workspace, (string) Str::uuid()),
             ['media' => UploadedFile::fake()->image("f{$i}.png", 16, 16)],
-        );
+        )->assertSuccessful();
     }
 
-    $response = $this->postJson(
+    $this->postJson(
         signedUploadUrl($this->workspace, (string) Str::uuid()),
         ['media' => UploadedFile::fake()->image('over.png', 16, 16)],
-    );
-
-    $response->assertStatus(429);
+    )->assertStatus(429);
+});
+
+test('different workspaces on the same IP do not share the upload rate limit', function () {
+    $otherWorkspace = Workspace::factory()->create();
+
+    for ($i = 0; $i < 60; $i++) {
+        $this->postJson(
+            signedUploadUrl($this->workspace, (string) Str::uuid()),
+            ['media' => UploadedFile::fake()->image("a{$i}.png", 16, 16)],
+        )->assertSuccessful();
+    }
+
+    $this->postJson(
+        signedUploadUrl($this->workspace, (string) Str::uuid()),
+        ['media' => UploadedFile::fake()->image('blocked.png', 16, 16)],
+    )->assertStatus(429);
+
+    $this->postJson(
+        signedUploadUrl($otherWorkspace, (string) Str::uuid()),
+        ['media' => UploadedFile::fake()->image('other.png', 16, 16)],
+    )->assertSuccessful();
 });
diff --git a/tests/Feature/Mcp/PlatformToolTest.php b/tests/Feature/Mcp/PlatformToolTest.php
index e603f7cf..e8828b20 100644
--- a/tests/Feature/Mcp/PlatformToolTest.php
+++ b/tests/Feature/Mcp/PlatformToolTest.php
@@ -33,6 +33,18 @@
                         'default_content_type',
                         'content_types',
                     ])
+                    ->has('content_types', fn (AssertableJson $types) => $types
+                        ->each(fn (AssertableJson $type) => $type
+                            ->hasAll([
+                                'value',
+                                'label',
+                                'description',
+                                'max_media_count',
+                                'requires_media',
+                                'max_video_duration_sec',
+                            ])
+                        )
+                    )
                 )
             );
         });
@@ -45,3 +57,20 @@
     $response->assertOk()
         ->assertSee(['linkedin', 'linkedin_post', 'x_post', 'instagram_feed', 'mastodon_post']);
 });
+
+test('list content types exposes reel max video durations', function () {
+    $response = TryPostServer::actingAs($this->user)
+        ->tool(ListContentTypesTool::class, []);
+
+    $response->assertOk()
+        ->assertStructuredContent(function (AssertableJson $json) {
+            $json->etc();
+
+            $platforms = collect($json->toArray()['platforms']);
+            $instagramTypes = collect($platforms->firstWhere('platform', 'instagram')['content_types']);
+            $facebookTypes = collect($platforms->firstWhere('platform', 'facebook')['content_types']);
+
+            expect($instagramTypes->firstWhere('value', 'instagram_reel')['max_video_duration_sec'])->toBe(900);
+            expect($facebookTypes->firstWhere('value', 'facebook_reel')['max_video_duration_sec'])->toBe(90);
+        });
+});
diff --git a/tests/Feature/Mcp/RequestMediaUploadToolTest.php b/tests/Feature/Mcp/RequestMediaUploadToolTest.php
index 8ce7afbc..72041356 100644
--- a/tests/Feature/Mcp/RequestMediaUploadToolTest.php
+++ b/tests/Feature/Mcp/RequestMediaUploadToolTest.php
@@ -26,7 +26,7 @@
             $json->has('upload_token')
                 ->has('upload_url')
                 ->has('expires_at')
-                ->where('max_bytes', 52428800)
+                ->where('max_bytes', 300 * 1024 * 1024)
                 ->where('field_name', 'media')
                 ->etc();
         });
diff --git a/tests/Unit/Enums/ContentTypeTest.php b/tests/Unit/Enums/ContentTypeTest.php
index 6dd1ba83..d37ac5e2 100644
--- a/tests/Unit/Enums/ContentTypeTest.php
+++ b/tests/Unit/Enums/ContentTypeTest.php
@@ -21,11 +21,19 @@
 
 test('content type has correct descriptions', function () {
     expect(ContentType::InstagramFeed->description())->toContain('feed');
-    expect(ContentType::InstagramReel->description())->toContain('90 seconds');
+    expect(ContentType::InstagramReel->description())->toContain('15 minutes');
+    expect(ContentType::FacebookReel->description())->toContain('90 seconds');
     expect(ContentType::InstagramStory->description())->toContain('24 hours');
     expect(ContentType::YouTubeShort->description())->toContain('3 minutes');
 });
 
+test('content type exposes max video duration in seconds', function () {
+    expect(ContentType::InstagramReel->maxVideoDurationSec())->toBe(15 * 60);
+    expect(ContentType::FacebookReel->maxVideoDurationSec())->toBe(90);
+    expect(ContentType::YouTubeShort->maxVideoDurationSec())->toBe(3 * 60);
+    expect(ContentType::TikTokVideo->maxVideoDurationSec())->toBeNull();
+});
+
 test('content type maps to correct platform', function () {
     expect(ContentType::InstagramFeed->platform())->toBe(Platform::Instagram);
     expect(ContentType::InstagramReel->platform())->toBe(Platform::Instagram);