diff --git a/lib/private/ContextChat/ContentManager.php b/lib/private/ContextChat/ContentManager.php
index eae017b462d..3324ce6c700 100644
--- a/lib/private/ContextChat/ContentManager.php
+++ b/lib/private/ContextChat/ContentManager.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 /**
  * SPDX-FileCopyrightText: 2024-2025 Nextcloud GmbH and Nextcloud contributors
  * SPDX-License-Identifier: AGPL-3.0-or-later
diff --git a/lib/public/ContextChat/ContentItem.php b/lib/public/ContextChat/ContentItem.php
index 3cd193a2f60..9de8289d536 100644
--- a/lib/public/ContextChat/ContentItem.php
+++ b/lib/public/ContextChat/ContentItem.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 /**
  * SPDX-FileCopyrightText: 2024-2025 Nextcloud GmbH and Nextcloud contributors
  * SPDX-License-Identifier: AGPL-3.0-or-later
diff --git a/lib/public/ContextChat/Events/ContentProviderRegisterEvent.php b/lib/public/ContextChat/Events/ContentProviderRegisterEvent.php
index 95c77b5fe0b..32a542a0dbf 100644
--- a/lib/public/ContextChat/Events/ContentProviderRegisterEvent.php
+++ b/lib/public/ContextChat/Events/ContentProviderRegisterEvent.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 /**
  * SPDX-FileCopyrightText: 2024-2025 Nextcloud GmbH and Nextcloud contributors
  * SPDX-License-Identifier: AGPL-3.0-or-later
diff --git a/lib/public/ContextChat/IContentManager.php b/lib/public/ContextChat/IContentManager.php
index 34682b3329a..54e48809291 100644
--- a/lib/public/ContextChat/IContentManager.php
+++ b/lib/public/ContextChat/IContentManager.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 /**
  * SPDX-FileCopyrightText: 2024-2025 Nextcloud GmbH and Nextcloud contributors
  * SPDX-License-Identifier: AGPL-3.0-or-later
diff --git a/lib/public/ContextChat/IContentProvider.php b/lib/public/ContextChat/IContentProvider.php
index 79380db3e9b..b0c736e3c88 100644
--- a/lib/public/ContextChat/IContentProvider.php
+++ b/lib/public/ContextChat/IContentProvider.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 /**
  * SPDX-FileCopyrightText: 2024-2025 Nextcloud GmbH and Nextcloud contributors
  * SPDX-License-Identifier: AGPL-3.0-or-later
diff --git a/lib/public/ContextChat/Type/UpdateAccessOp.php b/lib/public/ContextChat/Type/UpdateAccessOp.php
index f0df12835e4..65100d1ce83 100644
--- a/lib/public/ContextChat/Type/UpdateAccessOp.php
+++ b/lib/public/ContextChat/Type/UpdateAccessOp.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 /**
  * SPDX-FileCopyrightText: 2024-2025 Nextcloud GmbH and Nextcloud contributors
  * SPDX-License-Identifier: AGPL-3.0-or-later