diff --git a/lib/internal/Magento/Framework/HTTP/AsyncClient/HttpResponseDeferredInterface.php b/lib/internal/Magento/Framework/HTTP/AsyncClient/HttpResponseDeferredInterface.php
index 7293cd571dc70..06d92bda7068a 100644
--- a/lib/internal/Magento/Framework/HTTP/AsyncClient/HttpResponseDeferredInterface.php
+++ b/lib/internal/Magento/Framework/HTTP/AsyncClient/HttpResponseDeferredInterface.php
@@ -12,6 +12,8 @@
 
 /**
  * Deferred HTTP response.
+ *
+ * @api
  */
 interface HttpResponseDeferredInterface extends CancelableDeferredInterface
 {
diff --git a/lib/internal/Magento/Framework/HTTP/AsyncClient/Request.php b/lib/internal/Magento/Framework/HTTP/AsyncClient/Request.php
index 871bb910e3acc..c78877730a7df 100644
--- a/lib/internal/Magento/Framework/HTTP/AsyncClient/Request.php
+++ b/lib/internal/Magento/Framework/HTTP/AsyncClient/Request.php
@@ -10,6 +10,8 @@
 
 /**
  * Request to send.
+ *
+ * @api
  */
 class Request
 {
diff --git a/lib/internal/Magento/Framework/HTTP/AsyncClient/Response.php b/lib/internal/Magento/Framework/HTTP/AsyncClient/Response.php
index e92515f74b58e..d13598820caec 100644
--- a/lib/internal/Magento/Framework/HTTP/AsyncClient/Response.php
+++ b/lib/internal/Magento/Framework/HTTP/AsyncClient/Response.php
@@ -10,6 +10,8 @@
 
 /**
  * Http response.
+ *
+ * @api
  */
 class Response
 {
diff --git a/lib/internal/Magento/Framework/HTTP/AsyncClientInterface.php b/lib/internal/Magento/Framework/HTTP/AsyncClientInterface.php
index ff739c58090b6..b7941abe28b66 100644
--- a/lib/internal/Magento/Framework/HTTP/AsyncClientInterface.php
+++ b/lib/internal/Magento/Framework/HTTP/AsyncClientInterface.php
@@ -13,6 +13,8 @@
 
 /**
  * Asynchronous HTTP client.
+ *
+ * @api
  */
 interface AsyncClientInterface
 {
diff --git a/lib/internal/Magento/Framework/Image/Adapter/AbstractAdapter.php b/lib/internal/Magento/Framework/Image/Adapter/AbstractAdapter.php
index dc34fb3fcddc9..3caab760f0108 100644
--- a/lib/internal/Magento/Framework/Image/Adapter/AbstractAdapter.php
+++ b/lib/internal/Magento/Framework/Image/Adapter/AbstractAdapter.php
@@ -12,8 +12,7 @@
 /**
  * Image abstract adapter
  *
- * @file        Abstract.php
- * @author      Magento Core Team <core@magentocommerce.com>
+ * @api
  * @SuppressWarnings(PHPMD.TooManyFields)
  */
 abstract class AbstractAdapter implements AdapterInterface
diff --git a/lib/internal/Magento/Framework/Image/Adapter/AdapterInterface.php b/lib/internal/Magento/Framework/Image/Adapter/AdapterInterface.php
index a981df9d9fddc..6d3b8dd7d7865 100644
--- a/lib/internal/Magento/Framework/Image/Adapter/AdapterInterface.php
+++ b/lib/internal/Magento/Framework/Image/Adapter/AdapterInterface.php
@@ -3,11 +3,14 @@
  * Copyright © Magento, Inc. All rights reserved.
  * See COPYING.txt for license details.
  */
+declare(strict_types=1);
+
 namespace Magento\Framework\Image\Adapter;
 
 /**
  * Interface \Magento\Framework\Image\Adapter\AdapterInterface
  *
+ * @api
  */
 interface AdapterInterface
 {
diff --git a/lib/internal/Magento/Framework/Image/Adapter/ConfigInterface.php b/lib/internal/Magento/Framework/Image/Adapter/ConfigInterface.php
index aa014b61e867a..5b7143c36e959 100644
--- a/lib/internal/Magento/Framework/Image/Adapter/ConfigInterface.php
+++ b/lib/internal/Magento/Framework/Image/Adapter/ConfigInterface.php
@@ -3,11 +3,14 @@
  * Copyright © Magento, Inc. All rights reserved.
  * See COPYING.txt for license details.
  */
+declare(strict_types=1);
+
 namespace Magento\Framework\Image\Adapter;
 
 /**
  * Interface \Magento\Framework\Image\Adapter\ConfigInterface
  *
+ * @api
  */
 interface ConfigInterface
 {
diff --git a/lib/internal/Magento/Framework/Indexer/Config/DependencyInfoProviderInterface.php b/lib/internal/Magento/Framework/Indexer/Config/DependencyInfoProviderInterface.php
index 7bfd013e1cdc3..68e43de88373a 100644
--- a/lib/internal/Magento/Framework/Indexer/Config/DependencyInfoProviderInterface.php
+++ b/lib/internal/Magento/Framework/Indexer/Config/DependencyInfoProviderInterface.php
@@ -3,6 +3,7 @@
  * Copyright © Magento, Inc. All rights reserved.
  * See COPYING.txt for license details.
  */
+declare(strict_types=1);
 
 namespace Magento\Framework\Indexer\Config;
 
@@ -10,6 +11,8 @@
 
 /**
  * Provides an information about indexers dependencies.
+ *
+ * @api
  */
 interface DependencyInfoProviderInterface
 {
diff --git a/lib/internal/Magento/Framework/Indexer/Table/StrategyInterface.php b/lib/internal/Magento/Framework/Indexer/Table/StrategyInterface.php
index 84882aa747ad3..26058c5e39795 100644
--- a/lib/internal/Magento/Framework/Indexer/Table/StrategyInterface.php
+++ b/lib/internal/Magento/Framework/Indexer/Table/StrategyInterface.php
@@ -3,12 +3,14 @@
  * Copyright © Magento, Inc. All rights reserved.
  * See COPYING.txt for license details.
  */
+declare(strict_types=1);
 
 namespace Magento\Framework\Indexer\Table;
 
 /**
  * Interface \Magento\Framework\Indexer\Table\StrategyInterface
  *
+ * @api
  */
 interface StrategyInterface
 {
diff --git a/lib/internal/Magento/Framework/Interception/ConfigInterface.php b/lib/internal/Magento/Framework/Interception/ConfigInterface.php
index 00d45c7551731..f0e6fd40f9baa 100644
--- a/lib/internal/Magento/Framework/Interception/ConfigInterface.php
+++ b/lib/internal/Magento/Framework/Interception/ConfigInterface.php
@@ -5,11 +5,14 @@
  * Copyright © Magento, Inc. All rights reserved.
  * See COPYING.txt for license details.
  */
+declare(strict_types=1);
+
 namespace Magento\Framework\Interception;
 
 /**
  * Interface \Magento\Framework\Interception\ConfigInterface
  *
+ * @api
  */
 interface ConfigInterface
 {
diff --git a/lib/internal/Magento/Framework/Interception/ConfigLoaderInterface.php b/lib/internal/Magento/Framework/Interception/ConfigLoaderInterface.php
index 2a739f4cf9486..5c9590163710a 100644
--- a/lib/internal/Magento/Framework/Interception/ConfigLoaderInterface.php
+++ b/lib/internal/Magento/Framework/Interception/ConfigLoaderInterface.php
@@ -9,6 +9,8 @@
 
 /**
  * Interception configuration loader interface.
+ *
+ * @api
  */
 interface ConfigLoaderInterface
 {
diff --git a/lib/internal/Magento/Framework/Interception/ConfigWriterInterface.php b/lib/internal/Magento/Framework/Interception/ConfigWriterInterface.php
index 9193937b65816..8a8511461b50f 100644
--- a/lib/internal/Magento/Framework/Interception/ConfigWriterInterface.php
+++ b/lib/internal/Magento/Framework/Interception/ConfigWriterInterface.php
@@ -9,6 +9,8 @@
 
 /**
  * Interception config writer interface.
+ *
+ * @api
  */
 interface ConfigWriterInterface
 {
diff --git a/lib/internal/Magento/Framework/Interception/DefinitionInterface.php b/lib/internal/Magento/Framework/Interception/DefinitionInterface.php
index 9d7c2d31966d0..133eba77b4f73 100644
--- a/lib/internal/Magento/Framework/Interception/DefinitionInterface.php
+++ b/lib/internal/Magento/Framework/Interception/DefinitionInterface.php
@@ -5,11 +5,14 @@
  * Copyright © Magento, Inc. All rights reserved.
  * See COPYING.txt for license details.
  */
+declare(strict_types=1);
+
 namespace Magento\Framework\Interception;
 
 /**
  * Interface \Magento\Framework\Interception\DefinitionInterface
  *
+ * @api
  */
 interface DefinitionInterface
 {
diff --git a/lib/internal/Magento/Framework/Interception/InterceptorInterface.php b/lib/internal/Magento/Framework/Interception/InterceptorInterface.php
index 451d8b5c599b7..d88cacdeb5afe 100644
--- a/lib/internal/Magento/Framework/Interception/InterceptorInterface.php
+++ b/lib/internal/Magento/Framework/Interception/InterceptorInterface.php
@@ -3,6 +3,8 @@
  * Copyright © Magento, Inc. All rights reserved.
  * See COPYING.txt for license details.
  */
+declare(strict_types=1);
+
 namespace Magento\Framework\Interception;
 
 /**
@@ -10,6 +12,8 @@
  *
  * This interface exposes the parent method of the interception class, which allows the caller to bypass
  * the interception logic.
+ *
+ * @api
  */
 interface InterceptorInterface
 {
diff --git a/lib/internal/Magento/Framework/Interception/ObjectManager/ConfigInterface.php b/lib/internal/Magento/Framework/Interception/ObjectManager/ConfigInterface.php
index 441d96d0b1fa4..d54410470a4bc 100644
--- a/lib/internal/Magento/Framework/Interception/ObjectManager/ConfigInterface.php
+++ b/lib/internal/Magento/Framework/Interception/ObjectManager/ConfigInterface.php
@@ -3,11 +3,14 @@
  * Copyright © Magento, Inc. All rights reserved.
  * See COPYING.txt for license details.
  */
+declare(strict_types=1);
+
 namespace Magento\Framework\Interception\ObjectManager;
 
 /**
  * Interface \Magento\Framework\Interception\ObjectManager\ConfigInterface
  *
+ * @api
  */
 interface ConfigInterface extends \Magento\Framework\ObjectManager\ConfigInterface
 {
diff --git a/lib/internal/Magento/Framework/Interception/PluginListInterface.php b/lib/internal/Magento/Framework/Interception/PluginListInterface.php
index 00ee03cae5b75..16923827fa25a 100644
--- a/lib/internal/Magento/Framework/Interception/PluginListInterface.php
+++ b/lib/internal/Magento/Framework/Interception/PluginListInterface.php
@@ -5,11 +5,14 @@
  * Copyright © Magento, Inc. All rights reserved.
  * See COPYING.txt for license details.
  */
+declare(strict_types=1);
+
 namespace Magento\Framework\Interception;
 
 /**
  * Interface \Magento\Framework\Interception\PluginListInterface
  *
+ * @api
  */
 interface PluginListInterface
 {
diff --git a/lib/internal/Magento/Framework/Locale/AvailableLocalesInterface.php b/lib/internal/Magento/Framework/Locale/AvailableLocalesInterface.php
index c7b40f7a6e113..2867b63dc339d 100644
--- a/lib/internal/Magento/Framework/Locale/AvailableLocalesInterface.php
+++ b/lib/internal/Magento/Framework/Locale/AvailableLocalesInterface.php
@@ -3,12 +3,16 @@
  * Copyright © Magento, Inc. All rights reserved.
  * See COPYING.txt for license details.
  */
+declare(strict_types=1);
+
 namespace Magento\Framework\Locale;
 
 use Magento\Framework\View\DesignInterface;
 
 /**
  * Interface for classes that fetching codes of available locales for the concrete theme.
+ *
+ * @api
  */
 interface AvailableLocalesInterface
 {
diff --git a/lib/internal/Magento/Framework/Locale/OptionInterface.php b/lib/internal/Magento/Framework/Locale/OptionInterface.php
index 2169eedd2d900..3f2c5732e4738 100644
--- a/lib/internal/Magento/Framework/Locale/OptionInterface.php
+++ b/lib/internal/Magento/Framework/Locale/OptionInterface.php
@@ -3,10 +3,14 @@
  * Copyright © Magento, Inc. All rights reserved.
  * See COPYING.txt for license details.
  */
+declare(strict_types=1);
+
 namespace Magento\Framework\Locale;
 
 /**
  * Interface for classes that return array of locales.
+ *
+ * @api
  */
 interface OptionInterface
 {
diff --git a/lib/internal/Magento/Framework/Mail/Address.php b/lib/internal/Magento/Framework/Mail/Address.php
index 73f0025458c55..160bab65f939e 100644
--- a/lib/internal/Magento/Framework/Mail/Address.php
+++ b/lib/internal/Magento/Framework/Mail/Address.php
@@ -9,6 +9,8 @@
 
 /**
  * Class Address
+ *
+ * @api
  */
 class Address
 {
diff --git a/lib/internal/Magento/Framework/Mail/EmailMessageInterface.php b/lib/internal/Magento/Framework/Mail/EmailMessageInterface.php
index 93eaa4acde3a4..02e0dbe3ba081 100644
--- a/lib/internal/Magento/Framework/Mail/EmailMessageInterface.php
+++ b/lib/internal/Magento/Framework/Mail/EmailMessageInterface.php
@@ -3,11 +3,14 @@
  * Copyright © Magento, Inc. All rights reserved.
  * See COPYING.txt for license details.
  */
+declare(strict_types=1);
 
 namespace Magento\Framework\Mail;
 
 /**
  * Interface EmailMessageInterface
+ *
+ * @api
  */
 interface EmailMessageInterface extends MailMessageInterface
 {
diff --git a/lib/internal/Magento/Framework/Mail/MimeInterface.php b/lib/internal/Magento/Framework/Mail/MimeInterface.php
index a7910e195a160..3321bd502730a 100644
--- a/lib/internal/Magento/Framework/Mail/MimeInterface.php
+++ b/lib/internal/Magento/Framework/Mail/MimeInterface.php
@@ -3,12 +3,14 @@
  * Copyright © Magento, Inc. All rights reserved.
  * See COPYING.txt for license details.
  */
+declare(strict_types=1);
 
 namespace Magento\Framework\Mail;
 
 /**
  * Interface MimeInterface used providing constants
  *
+ * @api
  * @see \Laminas\Mime\Mime
  */
 interface MimeInterface
diff --git a/lib/internal/Magento/Framework/Mail/MimeMessageInterface.php b/lib/internal/Magento/Framework/Mail/MimeMessageInterface.php
index a272bcfd89809..280048f5eeda1 100644
--- a/lib/internal/Magento/Framework/Mail/MimeMessageInterface.php
+++ b/lib/internal/Magento/Framework/Mail/MimeMessageInterface.php
@@ -3,11 +3,14 @@
  * Copyright © Magento, Inc. All rights reserved.
  * See COPYING.txt for license details.
  */
+declare(strict_types=1);
 
 namespace Magento\Framework\Mail;
 
 /**
  * Interface MimeMessageInterface
+ *
+ * @api
  */
 interface MimeMessageInterface
 {
diff --git a/lib/internal/Magento/Framework/Mail/MimePartInterface.php b/lib/internal/Magento/Framework/Mail/MimePartInterface.php
index 8a658cdf975c9..0c00ac1756f87 100644
--- a/lib/internal/Magento/Framework/Mail/MimePartInterface.php
+++ b/lib/internal/Magento/Framework/Mail/MimePartInterface.php
@@ -3,11 +3,14 @@
  * Copyright © Magento, Inc. All rights reserved.
  * See COPYING.txt for license details.
  */
+declare(strict_types=1);
 
 namespace Magento\Framework\Mail;
 
 /**
  * Interface representing a MIME part.
+ *
+ * @api
  */
 interface MimePartInterface
 {
diff --git a/lib/internal/Magento/Framework/Message/ExceptionMessageFactoryInterface.php b/lib/internal/Magento/Framework/Message/ExceptionMessageFactoryInterface.php
index 3a95346e33d3a..42fa03bc7e2cb 100644
--- a/lib/internal/Magento/Framework/Message/ExceptionMessageFactoryInterface.php
+++ b/lib/internal/Magento/Framework/Message/ExceptionMessageFactoryInterface.php
@@ -3,6 +3,7 @@
  * Copyright © Magento, Inc. All rights reserved.
  * See COPYING.txt for license details.
  */
+declare(strict_types=1);
 
 namespace Magento\Framework\Message;
 
@@ -11,6 +12,7 @@
 /**
  * Interface \Magento\Framework\Message\ExceptionMessageFactoryInterface
  *
+ * @api
  */
 interface ExceptionMessageFactoryInterface
 {
diff --git a/lib/internal/Magento/Framework/ObjectManager/ConfigCacheInterface.php b/lib/internal/Magento/Framework/ObjectManager/ConfigCacheInterface.php
index 8552dece04d77..e05e292f47f53 100644
--- a/lib/internal/Magento/Framework/ObjectManager/ConfigCacheInterface.php
+++ b/lib/internal/Magento/Framework/ObjectManager/ConfigCacheInterface.php
@@ -8,6 +8,7 @@
 /**
  * Interface \Magento\Framework\ObjectManager\ConfigCacheInterface
  *
+ * @api
  */
 interface ConfigCacheInterface
 {
diff --git a/lib/internal/Magento/Framework/ObjectManager/RelationsInterface.php b/lib/internal/Magento/Framework/ObjectManager/RelationsInterface.php
index 21deeca418dad..e38442385a871 100644
--- a/lib/internal/Magento/Framework/ObjectManager/RelationsInterface.php
+++ b/lib/internal/Magento/Framework/ObjectManager/RelationsInterface.php
@@ -8,6 +8,7 @@
 /**
  * Interface \Magento\Framework\ObjectManager\RelationsInterface
  *
+ * @api
  */
 interface RelationsInterface
 {