diff --git a/app/Enums/SocialAccount/Platform.php b/app/Enums/SocialAccount/Platform.php
index ee53b0541..7609c1825 100644
--- a/app/Enums/SocialAccount/Platform.php
+++ b/app/Enums/SocialAccount/Platform.php
@@ -158,10 +158,11 @@ public function supportsAltText(): bool
      *  - LinkedIn UGC: 3000 (`commentary` field)
      *  - X standard tweet: 280 (X Premium accepts 25K — ignored, conservative)
      *  - TikTok caption: 2200
-     *  - YouTube Shorts: title=100, description=5000. We feed `content` to both
-     *    (publisher derives title from the first line via `buildTitle`), and
-     *    Shorts UX only shows ~100 chars before "more" — capping at 100 keeps
-     *    posts appropriate for the format.
+     *  - YouTube Shorts: description=5000 (the cap here). The title never
+     *    overflows: it comes from `meta.title` (validated at 100) or is
+     *    derived from the first content line and truncated by `buildTitle`;
+     *    the full content goes to the description unless `meta.description`
+     *    overrides it.
      *  - Facebook text status: 10000 (API allows 63206; we cap below
      *    that — 63k-char posts are unrealistic and emoji-heavy content
      *    risks overflowing the TEXT column's 65535-byte ceiling)
@@ -179,7 +180,7 @@ public function maxContentLength(): int
             self::LinkedIn, self::LinkedInPage => 3000,
             self::X => 280,
             self::TikTok => 2200,
-            self::YouTube => 100,
+            self::YouTube => 5000,
             self::Facebook => 10000,
             self::Instagram, self::InstagramFacebook => 2200,
             self::Threads => 500,
diff --git a/app/Http/Controllers/Auth/InstagramController.php b/app/Http/Controllers/Auth/InstagramController.php
index 5a6fdbea7..dfc00e71e 100644
--- a/app/Http/Controllers/Auth/InstagramController.php
+++ b/app/Http/Controllers/Auth/InstagramController.php
@@ -25,6 +25,8 @@ class InstagramController extends SocialController
         'instagram_business_basic',
         'instagram_business_content_publish',
         'instagram_business_manage_insights',
+        // first comment after publish (FirstCommentPoster)
+        'instagram_business_manage_comments',
     ];
 
     public function connect(Request $request): Response
diff --git a/app/Http/Controllers/Auth/InstagramFacebookController.php b/app/Http/Controllers/Auth/InstagramFacebookController.php
index 6f2a2af94..273428054 100644
--- a/app/Http/Controllers/Auth/InstagramFacebookController.php
+++ b/app/Http/Controllers/Auth/InstagramFacebookController.php
@@ -49,6 +49,8 @@ class InstagramFacebookController extends MetaController
         'instagram_basic',
         'instagram_content_publish',
         'instagram_manage_insights',
+        // first comment after publish (FirstCommentPoster)
+        'instagram_manage_comments',
     ];
 
     public function connect(Request $request): Response
diff --git a/app/Jobs/PublishToSocialPlatform.php b/app/Jobs/PublishToSocialPlatform.php
index 68308e003..a80ad5026 100644
--- a/app/Jobs/PublishToSocialPlatform.php
+++ b/app/Jobs/PublishToSocialPlatform.php
@@ -31,6 +31,7 @@
 use App\Services\Social\Telegram\TelegramPublisher;
 use App\Services\Social\ThreadsPublisher;
 use App\Services\Social\TikTokPublisher;
+use App\Services\Social\FirstCommentPoster;
 use App\Services\Social\XPublisher;
 use App\Services\Social\YouTubePublisher;
 use App\Support\Social\TikTokPhotoDerivativeCleaner;
@@ -126,6 +127,13 @@ public function handle(): void
                 $publisher = $this->getPublisher();
                 $result = $publisher->publish($this->postPlatform);
                 $this->postPlatform->markAsPublished(data_get($result, 'id'), data_get($result, 'url'));
+
+                // The post is live; a failed first comment must never fail it —
+                // FirstCommentPoster logs and swallows its own errors.
+                if (($externalId = (string) data_get($result, 'id')) !== '') {
+                    app(FirstCommentPoster::class)->post($this->postPlatform, $externalId);
+                }
+
                 break;
             } catch (PlatformUnavailableException $e) {
                 $this->rescheduleForRetry($e);
diff --git a/app/Mcp/Tools/Post/CreatePostTool.php b/app/Mcp/Tools/Post/CreatePostTool.php
index a90e40305..372c6f21d 100644
--- a/app/Mcp/Tools/Post/CreatePostTool.php
+++ b/app/Mcp/Tools/Post/CreatePostTool.php
@@ -79,7 +79,7 @@ public function schema(JsonSchema $schema): array
                 ->items($schema->object(fn ($p) => [
                     'social_account_id' => $p->string()->required()->description('UUID of the connected social account.'),
                     'content_type' => $p->string()->required()->description('Format for this platform (e.g. linkedin_post, x_post, instagram_feed).'),
-                    'meta' => $p->object()->description('Per-platform metadata. Instagram/Facebook: aspect_ratio (1:1|4:5|16:9|original). TikTok: privacy_level (required to publish) + flags (allow_comments, allow_duet, allow_stitch, disclose, brand_content_toggle, brand_organic_toggle, is_aigc, auto_add_music). Pinterest: board_id (required to publish — call ListPinterestBoardsTool first), title (≤100), link (destination URL). Pin description comes from the post content. Discord: channel_id (required to publish — call ListDiscordChannelsTool first), mentions ([{token,label}]), embeds ([{title,description,url,image,color}]).'),
+                    'meta' => $p->object()->description('Per-platform metadata. Instagram/Facebook: aspect_ratio (1:1|4:5|16:9|original). TikTok: privacy_level (required to publish) + flags (allow_comments, allow_duet, allow_stitch, disclose, brand_content_toggle, brand_organic_toggle, is_aigc, auto_add_music). Pinterest: board_id (required to publish — call ListPinterestBoardsTool first), title (≤100), link (destination URL). Pin description comes from the post content. Discord: channel_id (required to publish — call ListDiscordChannelsTool first), mentions ([{token,label}]), embeds ([{title,description,url,image,color}]). YouTube: description (≤5000, clickable links; falls back to post content). YouTube/Instagram: first_comment (≤2200, posted by the account right after publish).'),
                 ]))
                 ->description('Platforms to publish on. Accounts not listed remain available but disabled.'),
         ];
diff --git a/app/Mcp/Tools/Post/UpdatePostTool.php b/app/Mcp/Tools/Post/UpdatePostTool.php
index c48885578..bf753a5be 100644
--- a/app/Mcp/Tools/Post/UpdatePostTool.php
+++ b/app/Mcp/Tools/Post/UpdatePostTool.php
@@ -119,7 +119,7 @@ public function schema(JsonSchema $schema): array
                 ->items($schema->object(fn ($p) => [
                     'id' => $p->string()->required()->description('UUID of the post_platform row (from get-post-tool / list-posts-tool).'),
                     'content_type' => $p->string()->description('New content_type for this platform.'),
-                    'meta' => $p->object()->description('Per-platform metadata override. Instagram/Facebook: aspect_ratio. TikTok: privacy_level (required to publish) + flags. Pinterest: board_id (required to publish — call ListPinterestBoardsTool first), title (≤100), link (destination URL). Pin description comes from the post content. Discord: channel_id (required to publish — call ListDiscordChannelsTool first), mentions, embeds. Merged with existing meta.'),
+                    'meta' => $p->object()->description('Per-platform metadata override. Instagram/Facebook: aspect_ratio. TikTok: privacy_level (required to publish) + flags. Pinterest: board_id (required to publish — call ListPinterestBoardsTool first), title (≤100), link (destination URL). Pin description comes from the post content. Discord: channel_id (required to publish — call ListDiscordChannelsTool first), mentions, embeds. YouTube: description (≤5000, clickable links; falls back to post content). YouTube/Instagram: first_comment (≤2200, posted by the account right after publish). Merged with existing meta.'),
                 ]))
                 ->description('Platforms to enable for publishing. Any platform NOT listed will be disabled. Pass an empty array to disable all.'),
         ];
diff --git a/app/Services/Social/FirstCommentPoster.php b/app/Services/Social/FirstCommentPoster.php
new file mode 100644
index 000000000..b0a7b32a4
--- /dev/null
+++ b/app/Services/Social/FirstCommentPoster.php
@@ -0,0 +1,102 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Services\Social;
+
+use App\Enums\SocialAccount\Platform;
+use App\Models\PostPlatform;
+use App\Services\Social\Concerns\HasSocialHttpClient;
+use Illuminate\Support\Facades\Log;
+
+/**
+ * Posts the per-platform `meta.first_comment` under a just-published post.
+ * The classic "link in the first comment" move: YouTube descriptions bury
+ * links below the fold and Instagram captions don't render them at all.
+ *
+ * Runs after the post is already live, so it must never fail the publish —
+ * every failure is logged and swallowed.
+ */
+class FirstCommentPoster
+{
+    use HasSocialHttpClient;
+
+    public function post(PostPlatform $postPlatform, string $externalId): void
+    {
+        $comment = trim((string) data_get($postPlatform->meta, 'first_comment'));
+
+        if ($comment === '') {
+            return;
+        }
+
+        try {
+            match ($postPlatform->platform) {
+                Platform::YouTube => $this->postYouTubeComment($postPlatform, $externalId, $comment),
+                Platform::Instagram, Platform::InstagramFacebook => $this->postInstagramComment($postPlatform, $externalId, $comment),
+                default => Log::warning('First comment is not supported for this platform', [
+                    'platform' => $postPlatform->platform->value,
+                    'post_platform_id' => $postPlatform->id,
+                ]),
+            };
+        } catch (\Throwable $e) {
+            Log::warning('First comment failed (post itself is published)', [
+                'platform' => $postPlatform->platform->value,
+                'post_platform_id' => $postPlatform->id,
+                'error' => $e->getMessage(),
+            ]);
+        }
+    }
+
+    /**
+     * commentThreads.insert needs the youtube.force-ssl scope — requested at
+     * connect time since the platform was added, so every account has it.
+     */
+    private function postYouTubeComment(PostPlatform $postPlatform, string $videoId, string $comment): void
+    {
+        $account = $postPlatform->socialAccount;
+        $api = rtrim((string) config('trypost.platforms.youtube.data_api'), '/');
+
+        $response = $this->socialHttp()
+            ->withToken($account->access_token)
+            ->post("{$api}/commentThreads?part=snippet", [
+                'snippet' => [
+                    'videoId' => $videoId,
+                    'topLevelComment' => [
+                        'snippet' => ['textOriginal' => $comment],
+                    ],
+                ],
+            ]);
+
+        if ($response->failed()) {
+            Log::warning('YouTube first comment failed', [
+                'post_platform_id' => $postPlatform->id,
+                'status' => $response->status(),
+                'body' => $this->redactResponseBody($response->body()),
+            ]);
+        }
+    }
+
+    /**
+     * Needs instagram_business_manage_comments (direct) / instagram_manage_comments
+     * (via Facebook Page) — accounts connected before the scope was requested
+     * get a 4xx here, which is logged and ignored; reconnecting fixes it.
+     */
+    private function postInstagramComment(PostPlatform $postPlatform, string $mediaId, string $comment): void
+    {
+        $account = $postPlatform->socialAccount;
+        $baseUrl = $account->platform->instagramGraphBaseUrl();
+
+        $response = $this->socialHttp()->post("{$baseUrl}/{$mediaId}/comments", [
+            'message' => $comment,
+            'access_token' => $account->access_token,
+        ]);
+
+        if ($response->failed()) {
+            Log::warning('Instagram first comment failed', [
+                'post_platform_id' => $postPlatform->id,
+                'status' => $response->status(),
+                'body' => $this->redactResponseBody($response->body()),
+            ]);
+        }
+    }
+}
diff --git a/app/Services/Social/YouTubePublisher.php b/app/Services/Social/YouTubePublisher.php
index a12b60a36..5065891c1 100644
--- a/app/Services/Social/YouTubePublisher.php
+++ b/app/Services/Social/YouTubePublisher.php
@@ -93,7 +93,7 @@ private function publishShort(PostPlatform $postPlatform, $media, SocialAccount
         }
 
         $title = $this->buildTitle($content);
-        $description = $content;
+        $description = $this->resolveDescription($postPlatform, $content);
 
         $tempFile = tempnam(sys_get_temp_dir(), 'yt_upload_');
         $handle = null;
@@ -221,6 +221,18 @@ private function buildTitle(string $content): string
         return $title.$shortsTag;
     }
 
+    /**
+     * The video description: the per-platform `meta.description` when the user
+     * provided one (YouTube allows 5000 chars and renders links clickable),
+     * otherwise the post content — the pre-meta behavior.
+     */
+    private function resolveDescription(PostPlatform $postPlatform, string $content): string
+    {
+        $description = trim((string) data_get($postPlatform->meta, 'description'));
+
+        return $description !== '' ? $description : $content;
+    }
+
     private function handleGoogleError(Exception $e): never
     {
         throw YouTubePublishException::fromGoogleException($e);
diff --git a/app/Support/PostPlatformMetaRules.php b/app/Support/PostPlatformMetaRules.php
index cec61ee93..11ae85c41 100644
--- a/app/Support/PostPlatformMetaRules.php
+++ b/app/Support/PostPlatformMetaRules.php
@@ -59,6 +59,16 @@ public static function rules(): array
             'platforms.*.meta.brand_content_toggle' => ['sometimes', 'boolean'],
             'platforms.*.meta.brand_organic_toggle' => ['sometimes', 'boolean'],
 
+            // YouTube — full video description (YouTube allows 5000 chars with
+            // clickable links; without it the publisher falls back to the post
+            // content, which is capped at the 100-char Shorts title).
+            'platforms.*.meta.description' => ['sometimes', 'nullable', 'string', 'max:5000'],
+
+            // First comment posted right after a successful publish (YouTube and
+            // Instagram). Capped at Instagram's comment limit, the stricter of
+            // the two.
+            'platforms.*.meta.first_comment' => ['sometimes', 'nullable', 'string', 'max:2200'],
+
             // Pinterest
             'platforms.*.meta.board_id' => ['sometimes', 'nullable', 'string'],
             'platforms.*.meta.title' => ['sometimes', 'nullable', 'string', 'max:100'],
@@ -90,6 +100,8 @@ public static function messages(): array
             'platforms.*.meta.link.url' => __('posts.form.pinterest.link_invalid'),
             'platforms.*.meta.link.max' => __('posts.form.pinterest.link_max'),
             'platforms.*.meta.title.max' => __('posts.form.pinterest.title_max'),
+            'platforms.*.meta.description.max' => __('posts.form.youtube.description_max'),
+            'platforms.*.meta.first_comment.max' => __('posts.form.first_comment.max'),
         ];
     }
 
@@ -103,6 +115,8 @@ public static function attributes(): array
         return [
             'platforms.*.meta.title' => __('posts.form.pinterest.title'),
             'platforms.*.meta.link' => __('posts.form.pinterest.link'),
+            'platforms.*.meta.description' => __('posts.form.youtube.description'),
+            'platforms.*.meta.first_comment' => __('posts.form.first_comment.label'),
         ];
     }
 
diff --git a/lang/ar/posts.php b/lang/ar/posts.php
index 43445d185..6affd19d6 100644
--- a/lang/ar/posts.php
+++ b/lang/ar/posts.php
@@ -142,6 +142,21 @@
             'document_title' => 'عنوان المستند',
             'document_title_placeholder' => 'يظهر على منشور مستند PDF الخاص بك',
         ],
+        'youtube' => [
+            'settings' => 'إعدادات YouTube',
+            'posting_to' => 'النشر في',
+            'description' => 'الوصف',
+            'description_placeholder' => 'الوصف الكامل للفيديو: معلومات وروابط ووسوم…',
+            'description_hint' => 'حتى 5000 حرف، والروابط قابلة للنقر. إذا تُرك فارغًا يُستخدم نص المنشور.',
+            'description_max' => 'لا يمكن أن يتجاوز الوصف 5000 حرف.',
+        ],
+        'first_comment' => [
+            'label' => 'التعليق الأول',
+            'placeholder' => 'رابط وإضافات للتعليق الأول…',
+            'hint' => 'يُنشر باسم قناتك فور نشر الفيديو.',
+            'hint_instagram' => 'يُنشر فور النشر — المكان الكلاسيكي للروابط التي لا تكون قابلة للنقر في وصف Instagram. أعد ربط الحساب مرة واحدة لمنح إذن التعليقات.',
+            'max' => 'لا يمكن أن يتجاوز التعليق الأول 2200 حرف.',
+        ],
         'pinterest' => [
             'settings' => 'إعدادات Pinterest',
             'posting_to' => 'النشر إلى',
diff --git a/lang/de/posts.php b/lang/de/posts.php
index 481bc0c33..476ba37d0 100644
--- a/lang/de/posts.php
+++ b/lang/de/posts.php
@@ -144,6 +144,21 @@
             'document_title' => 'Dokumenttitel',
             'document_title_placeholder' => 'Wird bei deinem PDF-Dokument-Beitrag angezeigt',
         ],
+        'youtube' => [
+            'settings' => 'YouTube-Einstellungen',
+            'posting_to' => 'Veröffentlichen auf',
+            'description' => 'Beschreibung',
+            'description_placeholder' => 'Vollständige Videobeschreibung: Fakten, Links, Hashtags…',
+            'description_hint' => 'Bis zu 5000 Zeichen, Links sind klickbar. Wenn leer, wird der Beitragstext verwendet.',
+            'description_max' => 'Die Beschreibung darf 5000 Zeichen nicht überschreiten.',
+        ],
+        'first_comment' => [
+            'label' => 'Erster Kommentar',
+            'placeholder' => 'Link und Extras für den ersten Kommentar…',
+            'hint' => 'Wird direkt nach der Veröffentlichung vom Kanal gepostet.',
+            'hint_instagram' => 'Wird direkt nach dem Beitrag gepostet — der klassische Ort für Links, die in Instagram-Beschreibungen nicht klickbar sind. Konto einmal neu verbinden, um die Kommentar-Berechtigung zu erteilen.',
+            'max' => 'Der erste Kommentar darf 2200 Zeichen nicht überschreiten.',
+        ],
         'pinterest' => [
             'settings' => 'Pinterest-Einstellungen',
             'posting_to' => 'Veröffentlichen auf',
diff --git a/lang/el/posts.php b/lang/el/posts.php
index dbf866950..501a5ec93 100644
--- a/lang/el/posts.php
+++ b/lang/el/posts.php
@@ -142,6 +142,21 @@
             'document_title' => 'Τίτλος εγγράφου',
             'document_title_placeholder' => 'Εμφανίζεται στη δημοσίευση εγγράφου PDF σας',
         ],
+        'youtube' => [
+            'settings' => 'Ρυθμίσεις YouTube',
+            'posting_to' => 'Δημοσίευση σε',
+            'description' => 'Περιγραφή',
+            'description_placeholder' => 'Πλήρης περιγραφή βίντεο: πληροφορίες, σύνδεσμοι, hashtags…',
+            'description_hint' => 'Έως 5000 χαρακτήρες, οι σύνδεσμοι είναι κλικαρίσιμοι. Αν είναι κενό, χρησιμοποιείται το κείμενο της ανάρτησης.',
+            'description_max' => 'Η περιγραφή δεν μπορεί να υπερβαίνει τους 5000 χαρακτήρες.',
+        ],
+        'first_comment' => [
+            'label' => 'Πρώτο σχόλιο',
+            'placeholder' => 'Σύνδεσμος και πρόσθετα για το πρώτο σχόλιο…',
+            'hint' => 'Δημοσιεύεται από το κανάλι σας αμέσως μετά τη δημοσίευση του βίντεο.',
+            'hint_instagram' => 'Δημοσιεύεται αμέσως μετά την ανάρτηση — το κλασικό σημείο για συνδέσμους που οι λεζάντες του Instagram δεν κάνουν κλικαρίσιμους. Επανασυνδέστε τον λογαριασμό μία φορά για να δώσετε το δικαίωμα σχολίων.',
+            'max' => 'Το πρώτο σχόλιο δεν μπορεί να υπερβαίνει τους 2200 χαρακτήρες.',
+        ],
         'pinterest' => [
             'settings' => 'Ρυθμίσεις Pinterest',
             'posting_to' => 'Δημοσίευση σε',
diff --git a/lang/en/posts.php b/lang/en/posts.php
index 4add724af..2f06d81ec 100644
--- a/lang/en/posts.php
+++ b/lang/en/posts.php
@@ -142,6 +142,21 @@
             'document_title' => 'Document title',
             'document_title_placeholder' => 'Shown on your PDF document post',
         ],
+        'youtube' => [
+            'settings' => 'YouTube settings',
+            'posting_to' => 'Posting to',
+            'description' => 'Description',
+            'description_placeholder' => 'Full video description: facts, links, hashtags…',
+            'description_hint' => 'Up to 5000 characters, links are clickable. When empty, the post text is used.',
+            'description_max' => 'Description may not exceed 5000 characters.',
+        ],
+        'first_comment' => [
+            'label' => 'First comment',
+            'placeholder' => 'Link and extras for the first comment…',
+            'hint' => 'Posted by your channel right after the video is published.',
+            'hint_instagram' => 'Posted right after publishing — the classic spot for links Instagram captions can\'t make clickable. Requires reconnecting the account once to grant the comments permission.',
+            'max' => 'First comment may not exceed 2200 characters.',
+        ],
         'pinterest' => [
             'settings' => 'Pinterest Settings',
             'posting_to' => 'Posting to',
diff --git a/lang/es/posts.php b/lang/es/posts.php
index 7eb08c207..5f934ef2d 100644
--- a/lang/es/posts.php
+++ b/lang/es/posts.php
@@ -142,6 +142,21 @@
             'document_title' => 'Título del documento',
             'document_title_placeholder' => 'Se muestra en tu publicación de documento PDF',
         ],
+        'youtube' => [
+            'settings' => 'Ajustes de YouTube',
+            'posting_to' => 'Publicando en',
+            'description' => 'Descripción',
+            'description_placeholder' => 'Descripción completa del vídeo: datos, enlaces, hashtags…',
+            'description_hint' => 'Hasta 5000 caracteres, los enlaces son clicables. Si está vacío, se usa el texto de la publicación.',
+            'description_max' => 'La descripción no puede superar los 5000 caracteres.',
+        ],
+        'first_comment' => [
+            'label' => 'Primer comentario',
+            'placeholder' => 'Enlace y extras para el primer comentario…',
+            'hint' => 'Se publica desde tu canal justo después de publicar el vídeo.',
+            'hint_instagram' => 'Se publica justo después de la publicación: el lugar clásico para enlaces que Instagram no hace clicables en la descripción. Reconecta la cuenta una vez para conceder el permiso de comentarios.',
+            'max' => 'El primer comentario no puede superar los 2200 caracteres.',
+        ],
         'pinterest' => [
             'settings' => 'Configuración de Pinterest',
             'posting_to' => 'Publicando en',
diff --git a/lang/fr/posts.php b/lang/fr/posts.php
index 183ae393e..06548072b 100644
--- a/lang/fr/posts.php
+++ b/lang/fr/posts.php
@@ -142,6 +142,21 @@
             'document_title' => 'Titre du document',
             'document_title_placeholder' => 'Affiché sur votre publication de document PDF',
         ],
+        'youtube' => [
+            'settings' => 'Paramètres YouTube',
+            'posting_to' => 'Publication sur',
+            'description' => 'Description',
+            'description_placeholder' => 'Description complète de la vidéo : infos, liens, hashtags…',
+            'description_hint' => 'Jusqu\'à 5000 caractères, les liens sont cliquables. Si vide, le texte de la publication est utilisé.',
+            'description_max' => 'La description ne peut pas dépasser 5000 caractères.',
+        ],
+        'first_comment' => [
+            'label' => 'Premier commentaire',
+            'placeholder' => 'Lien et compléments pour le premier commentaire…',
+            'hint' => 'Publié par votre chaîne juste après la mise en ligne de la vidéo.',
+            'hint_instagram' => 'Publié juste après la publication — l\'endroit classique pour les liens que les légendes Instagram ne rendent pas cliquables. Reconnectez le compte une fois pour accorder l\'autorisation de commenter.',
+            'max' => 'Le premier commentaire ne peut pas dépasser 2200 caractères.',
+        ],
         'pinterest' => [
             'settings' => 'Paramètres Pinterest',
             'posting_to' => 'Publier sur',
diff --git a/lang/it/posts.php b/lang/it/posts.php
index f6b3198e9..c0d87b335 100644
--- a/lang/it/posts.php
+++ b/lang/it/posts.php
@@ -142,6 +142,21 @@
             'document_title' => 'Titolo del documento',
             'document_title_placeholder' => 'Mostrato sul tuo post con documento PDF',
         ],
+        'youtube' => [
+            'settings' => 'Impostazioni YouTube',
+            'posting_to' => 'Pubblicazione su',
+            'description' => 'Descrizione',
+            'description_placeholder' => 'Descrizione completa del video: dettagli, link, hashtag…',
+            'description_hint' => 'Fino a 5000 caratteri, i link sono cliccabili. Se vuoto, viene usato il testo del post.',
+            'description_max' => 'La descrizione non può superare i 5000 caratteri.',
+        ],
+        'first_comment' => [
+            'label' => 'Primo commento',
+            'placeholder' => 'Link ed extra per il primo commento…',
+            'hint' => 'Pubblicato dal tuo canale subito dopo la pubblicazione del video.',
+            'hint_instagram' => 'Pubblicato subito dopo il post: il posto classico per i link che le didascalie di Instagram non rendono cliccabili. Ricollega l\'account una volta per concedere il permesso sui commenti.',
+            'max' => 'Il primo commento non può superare i 2200 caratteri.',
+        ],
         'pinterest' => [
             'settings' => 'Impostazioni Pinterest',
             'posting_to' => 'Pubblicazione su',
diff --git a/lang/ja/posts.php b/lang/ja/posts.php
index 731c23ebf..64e8eb852 100644
--- a/lang/ja/posts.php
+++ b/lang/ja/posts.php
@@ -142,6 +142,21 @@
             'document_title' => 'ドキュメントタイトル',
             'document_title_placeholder' => 'PDF ドキュメント投稿に表示されます',
         ],
+        'youtube' => [
+            'settings' => 'YouTube設定',
+            'posting_to' => '投稿先',
+            'description' => '説明',
+            'description_placeholder' => '動画の詳細説明:情報、リンク、ハッシュタグなど…',
+            'description_hint' => '最大5000文字、リンクはクリック可能です。空の場合は投稿テキストが使われます。',
+            'description_max' => '説明は5000文字を超えられません。',
+        ],
+        'first_comment' => [
+            'label' => '最初のコメント',
+            'placeholder' => '最初のコメントに入れるリンクや補足…',
+            'hint' => '動画公開直後にチャンネルから投稿されます。',
+            'hint_instagram' => '投稿直後にコメントされます。Instagramのキャプションでクリックできないリンクの定番の置き場所です。コメント権限を付与するには一度アカウントを再連携してください。',
+            'max' => '最初のコメントは2200文字を超えられません。',
+        ],
         'pinterest' => [
             'settings' => 'Pinterest 設定',
             'posting_to' => '投稿先',
diff --git a/lang/ko/posts.php b/lang/ko/posts.php
index f93cd8564..cdb215c25 100644
--- a/lang/ko/posts.php
+++ b/lang/ko/posts.php
@@ -142,6 +142,21 @@
             'document_title' => '문서 제목',
             'document_title_placeholder' => 'PDF 문서 게시물에 표시됩니다',
         ],
+        'youtube' => [
+            'settings' => 'YouTube 설정',
+            'posting_to' => '게시 위치',
+            'description' => '설명',
+            'description_placeholder' => '동영상 전체 설명: 정보, 링크, 해시태그…',
+            'description_hint' => '최대 5000자, 링크는 클릭 가능합니다. 비워두면 게시물 텍스트가 사용됩니다.',
+            'description_max' => '설명은 5000자를 초과할 수 없습니다.',
+        ],
+        'first_comment' => [
+            'label' => '첫 댓글',
+            'placeholder' => '첫 댓글에 넣을 링크와 추가 내용…',
+            'hint' => '동영상 게시 직후 채널 명의로 작성됩니다.',
+            'hint_instagram' => '게시 직후 작성됩니다 — Instagram 캡션에서 클릭되지 않는 링크를 넣는 고전적인 방법입니다. 댓글 권한을 부여하려면 계정을 한 번 다시 연결하세요.',
+            'max' => '첫 댓글은 2200자를 초과할 수 없습니다.',
+        ],
         'pinterest' => [
             'settings' => 'Pinterest 설정',
             'posting_to' => '게시 대상',
diff --git a/lang/nl/posts.php b/lang/nl/posts.php
index 63c37c615..d101e6ff7 100644
--- a/lang/nl/posts.php
+++ b/lang/nl/posts.php
@@ -142,6 +142,21 @@
             'document_title' => 'Documenttitel',
             'document_title_placeholder' => 'Getoond op je PDF-documentpost',
         ],
+        'youtube' => [
+            'settings' => 'YouTube-instellingen',
+            'posting_to' => 'Publiceren op',
+            'description' => 'Beschrijving',
+            'description_placeholder' => 'Volledige videobeschrijving: feiten, links, hashtags…',
+            'description_hint' => 'Tot 5000 tekens, links zijn klikbaar. Indien leeg wordt de berichttekst gebruikt.',
+            'description_max' => 'De beschrijving mag niet langer zijn dan 5000 tekens.',
+        ],
+        'first_comment' => [
+            'label' => 'Eerste reactie',
+            'placeholder' => 'Link en extra\'s voor de eerste reactie…',
+            'hint' => 'Direct na publicatie door je kanaal geplaatst.',
+            'hint_instagram' => 'Direct na het bericht geplaatst — dé plek voor links die Instagram-bijschriften niet klikbaar maken. Verbind het account één keer opnieuw om de reactietoestemming te geven.',
+            'max' => 'De eerste reactie mag niet langer zijn dan 2200 tekens.',
+        ],
         'pinterest' => [
             'settings' => 'Pinterest-instellingen',
             'posting_to' => 'Posten naar',
diff --git a/lang/pl/posts.php b/lang/pl/posts.php
index e397a7474..63344be80 100644
--- a/lang/pl/posts.php
+++ b/lang/pl/posts.php
@@ -142,6 +142,21 @@
             'document_title' => 'Tytuł dokumentu',
             'document_title_placeholder' => 'Wyświetlany w Twoim poście z dokumentem PDF',
         ],
+        'youtube' => [
+            'settings' => 'Ustawienia YouTube',
+            'posting_to' => 'Publikowanie na',
+            'description' => 'Opis',
+            'description_placeholder' => 'Pełny opis filmu: informacje, linki, hasztagi…',
+            'description_hint' => 'Do 5000 znaków, linki są klikalne. Gdy pusto, używany jest tekst posta.',
+            'description_max' => 'Opis nie może przekraczać 5000 znaków.',
+        ],
+        'first_comment' => [
+            'label' => 'Pierwszy komentarz',
+            'placeholder' => 'Link i dodatki do pierwszego komentarza…',
+            'hint' => 'Publikowany przez Twój kanał zaraz po opublikowaniu filmu.',
+            'hint_instagram' => 'Publikowany zaraz po poście — klasyczne miejsce na linki, których opisy na Instagramie nie czynią klikalnymi. Połącz konto ponownie, aby nadać uprawnienie do komentarzy.',
+            'max' => 'Pierwszy komentarz nie może przekraczać 2200 znaków.',
+        ],
         'pinterest' => [
             'settings' => 'Ustawienia Pinterest',
             'posting_to' => 'Publikowanie na',
diff --git a/lang/pt-BR/posts.php b/lang/pt-BR/posts.php
index 37018fac1..b32d9c70f 100644
--- a/lang/pt-BR/posts.php
+++ b/lang/pt-BR/posts.php
@@ -142,6 +142,21 @@
             'document_title' => 'Título do documento',
             'document_title_placeholder' => 'Aparece no seu post de documento PDF',
         ],
+        'youtube' => [
+            'settings' => 'Configurações do YouTube',
+            'posting_to' => 'Publicando em',
+            'description' => 'Descrição',
+            'description_placeholder' => 'Descrição completa do vídeo: informações, links, hashtags…',
+            'description_hint' => 'Até 5000 caracteres, os links são clicáveis. Se vazio, o texto da publicação é usado.',
+            'description_max' => 'A descrição não pode exceder 5000 caracteres.',
+        ],
+        'first_comment' => [
+            'label' => 'Primeiro comentário',
+            'placeholder' => 'Link e extras para o primeiro comentário…',
+            'hint' => 'Publicado pelo seu canal logo após o vídeo ir ao ar.',
+            'hint_instagram' => 'Publicado logo após a postagem — o lugar clássico para links que as legendas do Instagram não tornam clicáveis. Reconecte a conta uma vez para conceder a permissão de comentários.',
+            'max' => 'O primeiro comentário não pode exceder 2200 caracteres.',
+        ],
         'pinterest' => [
             'settings' => 'Configurações do Pinterest',
             'posting_to' => 'Publicando em',
diff --git a/lang/ru/posts.php b/lang/ru/posts.php
index 947601df7..e9cba6a48 100644
--- a/lang/ru/posts.php
+++ b/lang/ru/posts.php
@@ -142,6 +142,21 @@
             'document_title' => 'Название документа',
             'document_title_placeholder' => 'Отображается в вашем посте с PDF-документом',
         ],
+        'youtube' => [
+            'settings' => 'Настройки YouTube',
+            'posting_to' => 'Публикация в',
+            'description' => 'Описание',
+            'description_placeholder' => 'Полное описание ролика: факты, ссылки, хэштеги…',
+            'description_hint' => 'До 5000 знаков, ссылки кликабельны. Если пусто — используется текст поста.',
+            'description_max' => 'Описание не может быть длиннее 5000 знаков.',
+        ],
+        'first_comment' => [
+            'label' => 'Первый комментарий',
+            'placeholder' => 'Ссылка и дополнения для первого комментария…',
+            'hint' => 'Публикуется от имени канала сразу после выхода ролика.',
+            'hint_instagram' => 'Публикуется сразу после поста — классическое место для ссылок, которые в описании Instagram некликабельны. Требуется один раз переподключить аккаунт, чтобы выдать право на комментарии.',
+            'max' => 'Первый комментарий не может быть длиннее 2200 знаков.',
+        ],
         'pinterest' => [
             'settings' => 'Настройки Pinterest',
             'posting_to' => 'Публикация в',
diff --git a/lang/tr/posts.php b/lang/tr/posts.php
index 5faa9a22f..f4721da8a 100644
--- a/lang/tr/posts.php
+++ b/lang/tr/posts.php
@@ -144,6 +144,21 @@
             'document_title' => 'Belge başlığı',
             'document_title_placeholder' => 'PDF belge gönderinizde gösterilir',
         ],
+        'youtube' => [
+            'settings' => 'YouTube ayarları',
+            'posting_to' => 'Şurada yayınlanıyor',
+            'description' => 'Açıklama',
+            'description_placeholder' => 'Videonun tam açıklaması: bilgiler, bağlantılar, etiketler…',
+            'description_hint' => 'En fazla 5000 karakter, bağlantılar tıklanabilir. Boşsa gönderi metni kullanılır.',
+            'description_max' => 'Açıklama 5000 karakteri aşamaz.',
+        ],
+        'first_comment' => [
+            'label' => 'İlk yorum',
+            'placeholder' => 'İlk yorum için bağlantı ve ekler…',
+            'hint' => 'Video yayınlandıktan hemen sonra kanalınız tarafından gönderilir.',
+            'hint_instagram' => 'Gönderiden hemen sonra paylaşılır — Instagram açıklamalarında tıklanamayan bağlantılar için klasik yer. Yorum iznini vermek için hesabı bir kez yeniden bağlayın.',
+            'max' => 'İlk yorum 2200 karakteri aşamaz.',
+        ],
         'pinterest' => [
             'settings' => 'Pinterest Ayarları',
             'posting_to' => 'Şuraya paylaşılıyor',
diff --git a/lang/uk/posts.php b/lang/uk/posts.php
index 4ee02d9fe..627750bb0 100644
--- a/lang/uk/posts.php
+++ b/lang/uk/posts.php
@@ -142,6 +142,21 @@
             'document_title' => 'Назва документа',
             'document_title_placeholder' => 'Відображається у вашому пості з PDF-документом',
         ],
+        'youtube' => [
+            'settings' => 'Налаштування YouTube',
+            'posting_to' => 'Публікація в',
+            'description' => 'Опис',
+            'description_placeholder' => 'Повний опис відео: факти, посилання, хештеги…',
+            'description_hint' => 'До 5000 знаків, посилання клікабельні. Якщо порожньо — використовується текст поста.',
+            'description_max' => 'Опис не може перевищувати 5000 знаків.',
+        ],
+        'first_comment' => [
+            'label' => 'Перший коментар',
+            'placeholder' => 'Посилання та доповнення для першого коментаря…',
+            'hint' => 'Публікується від імені каналу одразу після виходу відео.',
+            'hint_instagram' => 'Публікується одразу після поста — класичне місце для посилань, які в описі Instagram неклікабельні. Потрібно один раз перепідключити акаунт, щоб надати право на коментарі.',
+            'max' => 'Перший коментар не може перевищувати 2200 знаків.',
+        ],
         'pinterest' => [
             'settings' => 'Налаштування Pinterest',
             'posting_to' => 'Публікація в',
diff --git a/lang/zh/posts.php b/lang/zh/posts.php
index c8e519378..4e6b95fc1 100644
--- a/lang/zh/posts.php
+++ b/lang/zh/posts.php
@@ -142,6 +142,21 @@
             'document_title' => '文档标题',
             'document_title_placeholder' => '显示在你的 PDF 文档帖子上',
         ],
+        'youtube' => [
+            'settings' => 'YouTube 设置',
+            'posting_to' => '发布到',
+            'description' => '描述',
+            'description_placeholder' => '视频完整描述:信息、链接、话题标签…',
+            'description_hint' => '最多 5000 个字符,链接可点击。留空则使用帖子文本。',
+            'description_max' => '描述不能超过 5000 个字符。',
+        ],
+        'first_comment' => [
+            'label' => '首条评论',
+            'placeholder' => '首条评论中的链接和补充内容…',
+            'hint' => '视频发布后立即以频道名义发表。',
+            'hint_instagram' => '发布后立即评论——这是放置 Instagram 描述中无法点击的链接的经典位置。需重新连接一次账号以授予评论权限。',
+            'max' => '首条评论不能超过 2200 个字符。',
+        ],
         'pinterest' => [
             'settings' => 'Pinterest 设置',
             'posting_to' => '发布到',
diff --git a/resources/js/components/ChannelConfigurator.vue b/resources/js/components/ChannelConfigurator.vue
index 813d5dff0..4ad6b2c87 100644
--- a/resources/js/components/ChannelConfigurator.vue
+++ b/resources/js/components/ChannelConfigurator.vue
@@ -8,6 +8,7 @@ import InstagramSettings from '@/components/posts/editor/InstagramSettings.vue';
 import LinkedInSettings from '@/components/posts/editor/LinkedInSettings.vue';
 import PinterestSettings from '@/components/posts/editor/PinterestSettings.vue';
 import TikTokSettings from '@/components/posts/editor/TikTokSettings.vue';
+import YouTubeSettings from '@/components/posts/editor/YouTubeSettings.vue';
 import { Avatar } from '@/components/ui/avatar';
 import { Badge } from '@/components/ui/badge';
 import { Tooltip, TooltipContent, TooltipProvider, TooltipTrigger } from '@/components/ui/tooltip';
@@ -161,6 +162,15 @@ const settingsProps = (channel: Channel) => ({
                 :media="media"
             />
             <DiscordSettings v-else-if="channel.platform === Platform.Discord" v-bind="settingsProps(channel)" />
+            <YouTubeSettings
+                v-else-if="channel.platform === Platform.YouTube"
+                :social-account="channel.socialAccount"
+                :platform="channel.platform"
+                :meta="channel.meta"
+                :disabled="disabled"
+                :preview-only="previewOnly"
+                @update:meta="emit('update:meta', channel.id, $event)"
+            />
         </template>
     </div>
 </template>
diff --git a/resources/js/components/posts/editor/InstagramSettings.vue b/resources/js/components/posts/editor/InstagramSettings.vue
index bd17de38a..19a1c8940 100644
--- a/resources/js/components/posts/editor/InstagramSettings.vue
+++ b/resources/js/components/posts/editor/InstagramSettings.vue
@@ -4,6 +4,7 @@ import { computed, ref } from 'vue';
 
 import MediaRulesWarning from '@/components/posts/editor/MediaRulesWarning.vue';
 import { Avatar } from '@/components/ui/avatar';
+import { Textarea } from '@/components/ui/textarea';
 import { getPlatformLogo } from '@/composables/usePlatformLogo';
 import { ContentType } from '@/types/content-type';
 import type { MediaItem } from '@/types/media';
@@ -64,6 +65,13 @@ const pickAspectRatio = (value: string) => {
     if (props.disabled) return;
     emit('update:meta', { ...props.meta, aspect_ratio: value });
 };
+
+const FIRST_COMMENT_MAX = 2200;
+
+const firstComment = computed({
+    get: () => (props.meta?.first_comment as string | undefined) || '',
+    set: (value: string) => emit('update:meta', { ...props.meta, first_comment: value || null }),
+});
 </script>
 
 <template>
@@ -138,6 +146,23 @@ const pickAspectRatio = (value: string) => {
                 </div>
             </div>
 
+            <div class="space-y-2">
+                <div class="flex items-center justify-between">
+                    <p class="text-[11px] font-black uppercase tracking-widest text-foreground/60">{{ $t('posts.form.first_comment.label') }}</p>
+                    <span class="text-[11px] font-medium" :class="firstComment.length > FIRST_COMMENT_MAX ? 'text-destructive' : 'text-foreground/50'">
+                        {{ firstComment.length }}/{{ FIRST_COMMENT_MAX }}
+                    </span>
+                </div>
+                <Textarea
+                    v-model="firstComment"
+                    :rows="2"
+                    :maxlength="FIRST_COMMENT_MAX"
+                    :placeholder="$t('posts.form.first_comment.placeholder')"
+                    :disabled="disabled || previewOnly"
+                />
+                <p class="text-xs text-foreground/60">{{ $t('posts.form.first_comment.hint_instagram') }}</p>
+            </div>
+
             <MediaRulesWarning :content-type="contentType" :media="media" :platform="Platform.Instagram" />
         </div>
     </div>
diff --git a/resources/js/components/posts/editor/YouTubeSettings.vue b/resources/js/components/posts/editor/YouTubeSettings.vue
new file mode 100644
index 000000000..7f1e2fb17
--- /dev/null
+++ b/resources/js/components/posts/editor/YouTubeSettings.vue
@@ -0,0 +1,121 @@
+<script setup lang="ts">
+import { IconChevronDown, IconChevronUp } from '@tabler/icons-vue';
+import { computed, ref } from 'vue';
+
+import { Avatar } from '@/components/ui/avatar';
+import { Textarea } from '@/components/ui/textarea';
+import { getPlatformLogo } from '@/composables/usePlatformLogo';
+
+interface SocialAccount {
+    id: string;
+    platform: string;
+    display_name: string;
+    username: string;
+    display_label: string;
+    avatar_url: string | null;
+}
+
+interface Props {
+    socialAccount: SocialAccount | null;
+    platform: string;
+    meta?: Record<string, any>;
+    disabled?: boolean;
+    previewOnly?: boolean;
+}
+
+const props = withDefaults(defineProps<Props>(), {
+    meta: () => ({}),
+    disabled: false,
+    previewOnly: false,
+});
+
+const emit = defineEmits<{
+    'update:meta': [value: Record<string, any>];
+}>();
+
+const open = ref(false);
+
+const DESCRIPTION_MAX = 5000;
+const FIRST_COMMENT_MAX = 2200;
+
+const description = computed({
+    get: () => (props.meta?.description as string | undefined) || '',
+    set: (value: string) => emit('update:meta', { ...props.meta, description: value || null }),
+});
+
+const firstComment = computed({
+    get: () => (props.meta?.first_comment as string | undefined) || '',
+    set: (value: string) => emit('update:meta', { ...props.meta, first_comment: value || null }),
+});
+</script>
+
+<template>
+    <div class="rounded-xl border-2 border-foreground bg-card shadow-2xs">
+        <button
+            type="button"
+            class="flex w-full cursor-pointer items-center justify-between gap-3 p-4 text-sm"
+            @click="open = !open"
+        >
+            <span class="flex min-w-0 items-center gap-2">
+                <span class="inline-flex size-6 shrink-0 items-center justify-center overflow-hidden rounded-full border-2 border-foreground bg-card shadow-2xs">
+                    <img :src="getPlatformLogo(platform)" alt="YouTube" class="size-full object-cover" />
+                </span>
+                <span class="truncate font-bold text-foreground">{{ $t('posts.form.youtube.settings') }}</span>
+                <span v-if="socialAccount?.username" class="truncate font-medium text-foreground/60">·&nbsp;@{{ socialAccount.username }}</span>
+            </span>
+            <IconChevronUp v-if="open" class="size-4 shrink-0 text-foreground/60" />
+            <IconChevronDown v-else class="size-4 shrink-0 text-foreground/60" />
+        </button>
+
+        <div v-if="open" class="space-y-5 border-t-2 border-foreground/10 px-4 pb-4 pt-4">
+            <div v-if="socialAccount" class="flex items-center gap-3 rounded-lg bg-foreground/5 p-3">
+                <Avatar
+                    :src="socialAccount.avatar_url"
+                    :name="socialAccount.display_label"
+                    class="size-9 shrink-0 rounded-full border-2 border-foreground shadow-2xs"
+                />
+                <div class="min-w-0 flex-1">
+                    <p class="text-[11px] font-black uppercase tracking-widest text-foreground/60">{{ $t('posts.form.youtube.posting_to') }}</p>
+                    <p class="truncate text-sm">
+                        <span class="font-bold text-foreground">{{ socialAccount.display_label }}</span>
+                        <span v-if="socialAccount?.username" class="font-medium text-foreground/60">&nbsp;@{{ socialAccount.username }}</span>
+                    </p>
+                </div>
+            </div>
+
+            <div class="space-y-2">
+                <div class="flex items-center justify-between">
+                    <p class="text-[11px] font-black uppercase tracking-widest text-foreground/60">{{ $t('posts.form.youtube.description') }}</p>
+                    <span class="text-[11px] font-medium" :class="description.length > DESCRIPTION_MAX ? 'text-destructive' : 'text-foreground/50'">
+                        {{ description.length }}/{{ DESCRIPTION_MAX }}
+                    </span>
+                </div>
+                <Textarea
+                    v-model="description"
+                    :rows="4"
+                    :maxlength="DESCRIPTION_MAX"
+                    :placeholder="$t('posts.form.youtube.description_placeholder')"
+                    :disabled="disabled || previewOnly"
+                />
+                <p class="text-xs text-foreground/60">{{ $t('posts.form.youtube.description_hint') }}</p>
+            </div>
+
+            <div class="space-y-2">
+                <div class="flex items-center justify-between">
+                    <p class="text-[11px] font-black uppercase tracking-widest text-foreground/60">{{ $t('posts.form.first_comment.label') }}</p>
+                    <span class="text-[11px] font-medium" :class="firstComment.length > FIRST_COMMENT_MAX ? 'text-destructive' : 'text-foreground/50'">
+                        {{ firstComment.length }}/{{ FIRST_COMMENT_MAX }}
+                    </span>
+                </div>
+                <Textarea
+                    v-model="firstComment"
+                    :rows="2"
+                    :maxlength="FIRST_COMMENT_MAX"
+                    :placeholder="$t('posts.form.first_comment.placeholder')"
+                    :disabled="disabled || previewOnly"
+                />
+                <p class="text-xs text-foreground/60">{{ $t('posts.form.first_comment.hint') }}</p>
+            </div>
+        </div>
+    </div>
+</template>
diff --git a/tests/Feature/Api/PostApiPlatformMetaTest.php b/tests/Feature/Api/PostApiPlatformMetaTest.php
index 7966ab7ac..01c2f25d8 100644
--- a/tests/Feature/Api/PostApiPlatformMetaTest.php
+++ b/tests/Feature/Api/PostApiPlatformMetaTest.php
@@ -392,6 +392,45 @@
     Queue::assertPushed(PublishPost::class);
 });
 
+it('persists YouTube description and first_comment meta on store', function () {
+    $youtube = SocialAccount::factory()->create(['workspace_id' => $this->workspace->id, 'platform' => Platform::YouTube]);
+
+    $this->withHeaders($this->headers)
+        ->postJson(route('api.posts.store'), [
+            'content' => 'Short title text',
+            'platforms' => [[
+                'social_account_id' => $youtube->id,
+                'content_type' => ContentType::YouTubeShort->value,
+                'meta' => [
+                    'description' => "Full description with facts and links:\nhttps://example.com/map",
+                    'first_comment' => 'More details: https://example.com',
+                ],
+            ]],
+        ])
+        ->assertCreated();
+
+    $meta = PostPlatform::where('social_account_id', $youtube->id)->sole()->meta;
+
+    expect(data_get($meta, 'description'))->toBe("Full description with facts and links:\nhttps://example.com/map")
+        ->and(data_get($meta, 'first_comment'))->toBe('More details: https://example.com');
+});
+
+it('rejects a YouTube description over 5000 characters', function () {
+    $youtube = SocialAccount::factory()->create(['workspace_id' => $this->workspace->id, 'platform' => Platform::YouTube]);
+
+    $this->withHeaders($this->headers)
+        ->postJson(route('api.posts.store'), [
+            'content' => 'Short title text',
+            'platforms' => [[
+                'social_account_id' => $youtube->id,
+                'content_type' => ContentType::YouTubeShort->value,
+                'meta' => ['description' => str_repeat('a', 5001)],
+            ]],
+        ])
+        ->assertUnprocessable()
+        ->assertJsonValidationErrors(['platforms.0.meta.description']);
+});
+
 it('persists Pinterest title and link meta on store', function () {
     $pinterest = SocialAccount::factory()->create(['workspace_id' => $this->workspace->id, 'platform' => Platform::Pinterest]);
 
diff --git a/tests/Feature/Mcp/PostPlatformMetaToolTest.php b/tests/Feature/Mcp/PostPlatformMetaToolTest.php
index 85fd6e244..d7b2a458f 100644
--- a/tests/Feature/Mcp/PostPlatformMetaToolTest.php
+++ b/tests/Feature/Mcp/PostPlatformMetaToolTest.php
@@ -339,6 +339,30 @@
     Queue::assertPushed(PublishPost::class);
 });
 
+test('create post persists YouTube description and first_comment meta', function () {
+    $youtube = SocialAccount::factory()->create(['workspace_id' => $this->workspace->id, 'platform' => Platform::YouTube]);
+
+    $response = TryPostServer::actingAs($this->user)
+        ->tool(CreatePostTool::class, [
+            'content' => 'Short title text',
+            'platforms' => [[
+                'social_account_id' => $youtube->id,
+                'content_type' => ContentType::YouTubeShort->value,
+                'meta' => [
+                    'description' => 'Full description with a link: https://example.com/map',
+                    'first_comment' => 'More details: https://example.com',
+                ],
+            ]],
+        ]);
+
+    $response->assertOk();
+
+    $meta = PostPlatform::where('social_account_id', $youtube->id)->sole()->meta;
+
+    expect(data_get($meta, 'description'))->toBe('Full description with a link: https://example.com/map')
+        ->and(data_get($meta, 'first_comment'))->toBe('More details: https://example.com');
+});
+
 test('create post persists Pinterest title and link meta', function () {
     $pinterest = SocialAccount::factory()->create(['workspace_id' => $this->workspace->id, 'platform' => Platform::Pinterest]);
 
diff --git a/tests/Feature/Services/Social/FirstCommentPosterTest.php b/tests/Feature/Services/Social/FirstCommentPosterTest.php
new file mode 100644
index 000000000..ffe119634
--- /dev/null
+++ b/tests/Feature/Services/Social/FirstCommentPosterTest.php
@@ -0,0 +1,109 @@
+<?php
+
+declare(strict_types=1);
+
+use App\Enums\PostPlatform\ContentType;
+use App\Enums\SocialAccount\Platform;
+use App\Models\Post;
+use App\Models\PostPlatform;
+use App\Models\SocialAccount;
+use App\Models\User;
+use App\Models\Workspace;
+use App\Services\Social\FirstCommentPoster;
+use Illuminate\Support\Facades\Http;
+
+beforeEach(function () {
+    $this->user = User::factory()->create();
+    $this->workspace = Workspace::factory()->create(['user_id' => $this->user->id]);
+    $this->post = Post::factory()->create([
+        'workspace_id' => $this->workspace->id,
+        'user_id' => $this->user->id,
+        'content' => 'Post body',
+    ]);
+    $this->poster = new FirstCommentPoster;
+});
+
+function makePlatformRow(Workspace $workspace, Post $post, SocialAccount $account, ContentType $contentType, ?array $meta): PostPlatform
+{
+    return PostPlatform::factory()->create([
+        'post_id' => $post->id,
+        'social_account_id' => $account->id,
+        'platform' => $account->platform,
+        'content_type' => $contentType,
+        'meta' => $meta,
+    ]);
+}
+
+test('posts a youtube first comment via commentThreads.insert', function () {
+    $account = SocialAccount::factory()->youtube()->create(['workspace_id' => $this->workspace->id]);
+    $row = makePlatformRow($this->workspace, $this->post, $account, ContentType::YouTubeShort, [
+        'first_comment' => 'Link: https://example.com',
+    ]);
+
+    Http::fake(['*' => Http::response(['id' => 'thread-1'], 200)]);
+
+    $this->poster->post($row, 'video-123');
+
+    $api = rtrim((string) config('trypost.platforms.youtube.data_api'), '/');
+
+    Http::assertSent(function ($request) use ($api) {
+        return str_starts_with($request->url(), "{$api}/commentThreads")
+            && data_get($request->data(), 'snippet.videoId') === 'video-123'
+            && data_get($request->data(), 'snippet.topLevelComment.snippet.textOriginal') === 'Link: https://example.com';
+    });
+});
+
+test('posts an instagram first comment on the published media', function () {
+    $account = SocialAccount::factory()->instagram()->create(['workspace_id' => $this->workspace->id]);
+    $row = makePlatformRow($this->workspace, $this->post, $account, ContentType::InstagramFeed, [
+        'first_comment' => 'More: https://example.com',
+    ]);
+
+    Http::fake(['*' => Http::response(['id' => 'comment-1'], 200)]);
+
+    $this->poster->post($row, 'media-456');
+
+    $base = $account->platform->instagramGraphBaseUrl();
+
+    Http::assertSent(function ($request) use ($base) {
+        return str_starts_with($request->url(), "{$base}/media-456/comments")
+            && $request['message'] === 'More: https://example.com';
+    });
+});
+
+test('does nothing when first_comment meta is empty', function () {
+    $account = SocialAccount::factory()->youtube()->create(['workspace_id' => $this->workspace->id]);
+    $row = makePlatformRow($this->workspace, $this->post, $account, ContentType::YouTubeShort, ['first_comment' => '   ']);
+
+    Http::fake();
+
+    $this->poster->post($row, 'video-123');
+
+    Http::assertNothingSent();
+});
+
+test('a failed first comment never throws', function () {
+    $account = SocialAccount::factory()->instagram()->create(['workspace_id' => $this->workspace->id]);
+    $row = makePlatformRow($this->workspace, $this->post, $account, ContentType::InstagramFeed, [
+        'first_comment' => 'More: https://example.com',
+    ]);
+
+    Http::fake(['*' => Http::response(['error' => ['message' => 'Missing permission']], 403)]);
+
+    $this->poster->post($row, 'media-456');
+
+    expect(true)->toBeTrue();
+});
+
+test('unsupported platforms are skipped without requests', function () {
+    $account = SocialAccount::factory()->x()->create(['workspace_id' => $this->workspace->id]);
+    $row = makePlatformRow($this->workspace, $this->post, $account, ContentType::XPost, [
+        'first_comment' => 'ignored',
+    ]);
+
+    Http::fake();
+
+    $this->poster->post($row, 'tweet-1');
+
+    Http::assertNothingSent();
+});
diff --git a/tests/Feature/Services/Social/YouTubePublisherTest.php b/tests/Feature/Services/Social/YouTubePublisherTest.php
index eb7a072b2..5536ff61e 100644
--- a/tests/Feature/Services/Social/YouTubePublisherTest.php
+++ b/tests/Feature/Services/Social/YouTubePublisherTest.php
@@ -173,6 +173,26 @@
         ->toThrow(Exception::class, 'YouTube Shorts require a title');
 });
 
+test('youtube publisher resolves description from platform meta with content fallback', function () {
+    $publisher = new YouTubePublisher;
+    $reflection = new ReflectionClass($publisher);
+    $method = $reflection->getMethod('resolveDescription');
+    $method->setAccessible(true);
+
+    // No meta: falls back to the post content (pre-meta behavior)
+    $this->postPlatform->meta = null;
+    expect($method->invoke($publisher, $this->postPlatform, 'Post content'))->toBe('Post content');
+
+    // Meta description wins over the content
+    $this->postPlatform->meta = ['description' => "Full description\nhttps://example.com/map"];
+    expect($method->invoke($publisher, $this->postPlatform, 'Post content'))
+        ->toBe("Full description\nhttps://example.com/map");
+
+    // Whitespace-only meta description falls back to content
+    $this->postPlatform->meta = ['description' => '   '];
+    expect($method->invoke($publisher, $this->postPlatform, 'Post content'))->toBe('Post content');
+});
+
 test('youtube publisher builds correct title with shorts tag', function () {
     $publisher = new YouTubePublisher;
     $reflection = new ReflectionClass($publisher);
diff --git a/tests/Unit/Enums/PlatformTest.php b/tests/Unit/Enums/PlatformTest.php
index 5b9fc8f70..268a33804 100644
--- a/tests/Unit/Enums/PlatformTest.php
+++ b/tests/Unit/Enums/PlatformTest.php
@@ -61,7 +61,7 @@
     expect(Platform::LinkedIn->maxContentLength())->toBe(3000);
     expect(Platform::X->maxContentLength())->toBe(280);
     expect(Platform::TikTok->maxContentLength())->toBe(2200);
-    expect(Platform::YouTube->maxContentLength())->toBe(100);
+    expect(Platform::YouTube->maxContentLength())->toBe(5000);
     expect(Platform::Facebook->maxContentLength())->toBe(10000);
     expect(Platform::Instagram->maxContentLength())->toBe(2200);
     expect(Platform::Threads->maxContentLength())->toBe(500);
diff --git a/tests/Unit/PostPlatformMetaRulesTest.php b/tests/Unit/PostPlatformMetaRulesTest.php
index f3af6ec52..2dfe4343f 100644
--- a/tests/Unit/PostPlatformMetaRulesTest.php
+++ b/tests/Unit/PostPlatformMetaRulesTest.php
@@ -4,18 +4,22 @@
 
 use App\Support\PostPlatformMetaRules;
 
-test('custom meta messages only cover pinterest title and link', function () {
+test('custom meta messages cover pinterest, youtube and first-comment fields', function () {
     expect(PostPlatformMetaRules::messages())->toBe([
         'platforms.*.meta.link.url' => __('posts.form.pinterest.link_invalid'),
         'platforms.*.meta.link.max' => __('posts.form.pinterest.link_max'),
         'platforms.*.meta.title.max' => __('posts.form.pinterest.title_max'),
+        'platforms.*.meta.description.max' => __('posts.form.youtube.description_max'),
+        'platforms.*.meta.first_comment.max' => __('posts.form.first_comment.max'),
     ]);
 });
 
-test('custom meta attributes only rename pinterest title and link', function () {
+test('custom meta attributes rename pinterest, youtube and first-comment fields', function () {
     expect(PostPlatformMetaRules::attributes())->toBe([
         'platforms.*.meta.title' => __('posts.form.pinterest.title'),
         'platforms.*.meta.link' => __('posts.form.pinterest.link'),
+        'platforms.*.meta.description' => __('posts.form.youtube.description'),
+        'platforms.*.meta.first_comment' => __('posts.form.first_comment.label'),
     ]);
 });
 
@@ -29,5 +33,7 @@
         'platforms.*.meta.channel_id',
         'platforms.*.meta.title',
         'platforms.*.meta.link',
+        'platforms.*.meta.description',
+        'platforms.*.meta.first_comment',
     ]);
 });