diff --git a/core/lib/Drupal/Component/Annotation/AnnotationInterface.php b/core/lib/Drupal/Component/Annotation/AnnotationInterface.php
index eb44b398193e73ac97dbea918b88f3424af694ad..bb0fdbcb946026a58fbf162e4f69323395f1148f 100644
--- a/core/lib/Drupal/Component/Annotation/AnnotationInterface.php
+++ b/core/lib/Drupal/Component/Annotation/AnnotationInterface.php
@@ -16,6 +16,7 @@ public function get();
    * Gets the name of the provider of the annotated class.
    *
    * @return string
+   *   The provider of the annotated class.
    */
   public function getProvider();
 
@@ -31,6 +32,7 @@ public function setProvider($provider);
    * Gets the unique ID for this annotated class.
    *
    * @return string
+   *   The annotated class ID.
    */
   public function getId();
 
@@ -38,6 +40,7 @@ public function getId();
    * Gets the class of the annotated class.
    *
    * @return string
+   *   The class name of the annotated class.
    */
   public function getClass();
 
diff --git a/core/lib/Drupal/Component/Annotation/Plugin/Discovery/AnnotatedClassDiscovery.php b/core/lib/Drupal/Component/Annotation/Plugin/Discovery/AnnotatedClassDiscovery.php
index 27ad81572dfea28113928face50afa81e22b876d..d23a91286de7e83094b388699ab52523b349acc8 100644
--- a/core/lib/Drupal/Component/Annotation/Plugin/Discovery/AnnotatedClassDiscovery.php
+++ b/core/lib/Drupal/Component/Annotation/Plugin/Discovery/AnnotatedClassDiscovery.php
@@ -181,6 +181,7 @@ protected function prepareAnnotationDefinition(AnnotationInterface $annotation,
    * Gets an array of PSR-4 namespaces to search for plugin classes.
    *
    * @return string[]
+   *   The PSR-4 namespaces for the plugin class.
    */
   protected function getPluginNamespaces() {
     return $this->pluginNamespaces;
diff --git a/core/lib/Drupal/Component/Datetime/DateTimePlus.php b/core/lib/Drupal/Component/Datetime/DateTimePlus.php
index 35f2e80f0d3354c2f110d2bbf5be2d189d9484e2..bb3a9b9789115fc066c62c3e4919f45d7f2282b0 100644
--- a/core/lib/Drupal/Component/Datetime/DateTimePlus.php
+++ b/core/lib/Drupal/Component/Datetime/DateTimePlus.php
@@ -327,6 +327,7 @@ public function __construct($time = 'now', $timezone = NULL, $settings = []) {
    * Renders the timezone name.
    *
    * @return string
+   *   The formatted value of the date including the name of the timezone.
    */
   public function render() {
     return $this->format(static::FORMAT) . ' ' . $this->getTimeZone()->getName();
diff --git a/core/lib/Drupal/Component/Discovery/YamlDiscovery.php b/core/lib/Drupal/Component/Discovery/YamlDiscovery.php
index 6bbc62ee73a6cac64fb4f7c385ef81908d6a64dc..74310492bd96bd96bcbf6642993200d5cc5ef698 100644
--- a/core/lib/Drupal/Component/Discovery/YamlDiscovery.php
+++ b/core/lib/Drupal/Component/Discovery/YamlDiscovery.php
@@ -77,6 +77,7 @@ public function findAll() {
    *   Yaml file path.
    *
    * @return array
+   *   The decoded contents of the YAML file.
    */
   protected function decode($file) {
     try {
@@ -91,6 +92,7 @@ protected function decode($file) {
    * Returns an array of file paths, keyed by provider.
    *
    * @return array
+   *   An array of file paths.
    */
   protected function findFiles() {
     $files = [];
diff --git a/core/lib/Drupal/Component/Gettext/PoItem.php b/core/lib/Drupal/Component/Gettext/PoItem.php
index 41014c9648d639653966eec545e4035c1911fa32..7cc32568ad2313f48f9a6f3bcf01c97259d8eac1 100644
--- a/core/lib/Drupal/Component/Gettext/PoItem.php
+++ b/core/lib/Drupal/Component/Gettext/PoItem.php
@@ -67,7 +67,8 @@ class PoItem {
   /**
    * Gets the language code of the currently used language.
    *
-   * @return string with langcode
+   * @return string
+   *   The language code for this item.
    */
   public function getLangcode() {
     return $this->langcode;
@@ -86,7 +87,8 @@ public function setLangcode($langcode) {
   /**
    * Gets the context this translation belongs to.
    *
-   * @return string $context
+   * @return string
+   *   The context for this translation.
    */
   public function getContext() {
     return $this->context;
@@ -157,6 +159,7 @@ public function setPlural($plural) {
    * Get if the translation has plural values.
    *
    * @return bool
+   *   TRUE if the translation has plurals, otherwise FALSE.
    */
   public function isPlural() {
     return $this->plural;
@@ -165,7 +168,8 @@ public function isPlural() {
   /**
    * Gets the comment of this translation.
    *
-   * @return String $comment
+   * @return string
+   *   The comment of this translation.
    */
   public function getComment() {
     return $this->comment;
diff --git a/core/lib/Drupal/Component/Gettext/PoMemoryWriter.php b/core/lib/Drupal/Component/Gettext/PoMemoryWriter.php
index 5f32e462c93150a9fcedbfcec264cd8926737bc0..b4d28b5d7697c3101a578799b211895036c07c39 100644
--- a/core/lib/Drupal/Component/Gettext/PoMemoryWriter.php
+++ b/core/lib/Drupal/Component/Gettext/PoMemoryWriter.php
@@ -46,7 +46,8 @@ public function writeItems(PoReaderInterface $reader, $count = -1) {
   /**
    * Get all stored PoItem's.
    *
-   * @return array PoItem
+   * @return array
+   *   Array of all PoItem elements.
    */
   public function getData() {
     return $this->items;
diff --git a/core/lib/Drupal/Component/HttpFoundation/SecuredRedirectResponse.php b/core/lib/Drupal/Component/HttpFoundation/SecuredRedirectResponse.php
index 37c01a1b56471c36db5a7bfee150a1c2b4b482ee..df039b8580a8a6e01bacaaca6c424d72317edf27 100644
--- a/core/lib/Drupal/Component/HttpFoundation/SecuredRedirectResponse.php
+++ b/core/lib/Drupal/Component/HttpFoundation/SecuredRedirectResponse.php
@@ -67,6 +67,7 @@ public function setTargetUrl($url): static {
    *   The URL checked for safety.
    *
    * @return bool
+   *   Returns TRUE if the URL is safe, FALSE otherwise.
    */
   abstract protected function isSafe($url);
 
diff --git a/core/lib/Drupal/Component/Plugin/Attribute/AttributeInterface.php b/core/lib/Drupal/Component/Plugin/Attribute/AttributeInterface.php
index 30964398a90f0e071f712f0a8254005b58280452..4c1e96810a7364204af085efa8efff93e62dfcfc 100644
--- a/core/lib/Drupal/Component/Plugin/Attribute/AttributeInterface.php
+++ b/core/lib/Drupal/Component/Plugin/Attribute/AttributeInterface.php
@@ -16,6 +16,7 @@ public function get(): mixed;
    * Gets the name of the provider of the attribute class.
    *
    * @return string|null
+   *   The provider of the attribute class.
    */
   public function getProvider(): ?string;
 
@@ -31,6 +32,7 @@ public function setProvider(string $provider): void;
    * Gets the unique ID for this attribute class.
    *
    * @return string
+   *   The attribute class ID.
    */
   public function getId(): string;
 
@@ -38,6 +40,7 @@ public function getId(): string;
    * Gets the class of the attribute class.
    *
    * @return class-string|null
+   *   The attribute class.
    */
   public function getClass(): ?string;
 
diff --git a/core/lib/Drupal/Component/Plugin/Discovery/AttributeClassDiscovery.php b/core/lib/Drupal/Component/Plugin/Discovery/AttributeClassDiscovery.php
index 14c25f2f3f3c4d465a04ecede1c4e6d4ab5f1f8b..59a220d4f1a935d11803dc7d68ae812fc9061c4f 100644
--- a/core/lib/Drupal/Component/Plugin/Discovery/AttributeClassDiscovery.php
+++ b/core/lib/Drupal/Component/Plugin/Discovery/AttributeClassDiscovery.php
@@ -166,6 +166,7 @@ protected function prepareAttributeDefinition(AttributeInterface $attribute, str
    * Gets an array of PSR-4 namespaces to search for plugin classes.
    *
    * @return string[][]
+   *   An array of namespaces to search.
    */
   protected function getPluginNamespaces(): array {
     return $this->pluginNamespaces;
diff --git a/core/lib/Drupal/Component/Plugin/PluginManagerBase.php b/core/lib/Drupal/Component/Plugin/PluginManagerBase.php
index d95bbf032702771a866e3caa557ef1301ad8702f..55343a27dad4d3da682a6c82dead65d5c1d1216c 100644
--- a/core/lib/Drupal/Component/Plugin/PluginManagerBase.php
+++ b/core/lib/Drupal/Component/Plugin/PluginManagerBase.php
@@ -37,6 +37,7 @@ abstract class PluginManagerBase implements PluginManagerInterface {
    * Gets the plugin discovery.
    *
    * @return \Drupal\Component\Plugin\Discovery\DiscoveryInterface
+   *   The plugin discovery.
    */
   protected function getDiscovery() {
     return $this->discovery;
@@ -46,6 +47,7 @@ protected function getDiscovery() {
    * Gets the plugin factory.
    *
    * @return \Drupal\Component\Plugin\Factory\FactoryInterface
+   *   The plugin factory.
    */
   protected function getFactory() {
     return $this->factory;
diff --git a/core/lib/Drupal/Component/ProxyBuilder/ProxyBuilder.php b/core/lib/Drupal/Component/ProxyBuilder/ProxyBuilder.php
index 63d72bccb47318ab2a3517c19a04f2b03b47a43a..1e9fca562f5d1b16b5945ca2b8d3f116179240bc 100644
--- a/core/lib/Drupal/Component/ProxyBuilder/ProxyBuilder.php
+++ b/core/lib/Drupal/Component/ProxyBuilder/ProxyBuilder.php
@@ -167,6 +167,7 @@ public function build($class_name) {
    * Generates the string for the method which loads the actual service.
    *
    * @return string
+   *   A string for the lazyLoadItself method.
    */
   protected function buildLazyLoadItselfMethod() {
     $output = <<<'EOS'
@@ -197,6 +198,7 @@ protected function lazyLoadItself()
    *   A reflection method for the method.
    *
    * @return string
+   *   The docblock, signature, and body for a method.
    */
   protected function buildMethod(\ReflectionMethod $reflection_method) {
 
@@ -260,6 +262,7 @@ protected function buildMethod(\ReflectionMethod $reflection_method) {
    *   A reflection object of the parameter.
    *
    * @return string
+   *   A parameter string.
    */
   protected function buildParameter(\ReflectionParameter $parameter) {
     $parameter_string = '';
@@ -301,6 +304,7 @@ protected function buildParameter(\ReflectionParameter $parameter) {
    *   A reflection method for the method.
    *
    * @return string
+   *   The body for a method.
    */
   protected function buildMethodBody(\ReflectionMethod $reflection_method) {
     $output = '';
@@ -335,6 +339,7 @@ protected function buildMethodBody(\ReflectionMethod $reflection_method) {
    * Builds the constructor used to inject the actual service ID.
    *
    * @return string
+   *   The constructor for a class.
    */
   protected function buildConstructorMethod() {
     $output = <<<'EOS'
@@ -361,6 +366,7 @@ public function __construct(\Symfony\Component\DependencyInjection\ContainerInte
    * Build the required use statements of the proxy class.
    *
    * @return string
+   *   The use statements.
    */
   protected function buildUseStatements() {
     $output = '';
diff --git a/core/lib/Drupal/Component/Utility/DeprecationHelper.php b/core/lib/Drupal/Component/Utility/DeprecationHelper.php
index e801a48ed659c5867641c15e1b3bde9552fa99fd..e62ef3f71061f7312df856e9b0644b8e5dea99c9 100644
--- a/core/lib/Drupal/Component/Utility/DeprecationHelper.php
+++ b/core/lib/Drupal/Component/Utility/DeprecationHelper.php
@@ -31,6 +31,10 @@ final class DeprecationHelper {
    *   Callback for deprecated code path.
    *
    * @return Current|Deprecated
+   *   The method to invoke based on the current version and the version of the
+   *   deprecation. The current callback when the current version is greater
+   *   than or equal to the version of the deprecation. Otherwise, the
+   *   deprecated callback.
    */
   public static function backwardsCompatibleCall(string $currentVersion, string $deprecatedVersion, callable $currentCallable, callable $deprecatedCallable): mixed {
     // Normalize the version string when it's a dev version to the first point release of that minor. E.g. 10.2.x-dev
diff --git a/core/lib/Drupal/Component/Utility/Random.php b/core/lib/Drupal/Component/Utility/Random.php
index a23fd11a164e718133ea386346d3baad3ba7bc75..b72e5f90804fb82d8f2cad86b27bff4bd8084a9c 100644
--- a/core/lib/Drupal/Component/Utility/Random.php
+++ b/core/lib/Drupal/Component/Utility/Random.php
@@ -183,12 +183,16 @@ public function machineName(int $length = 8, bool $unique = FALSE): string {
   }
 
   /**
-   * Generate a string that looks like a word (letters only, alternating consonants and vowels).
+   * Generates a string that looks like a word.
+   *
+   * The generated string contains only letters and has alternating consonants
+   * and vowels.
    *
    * @param int $length
    *   The desired word length.
    *
    * @return string
+   *   A random string with the requested number of random words.
    */
   public function word($length) {
     $vowels = ["a", "e", "i", "o", "u"];
@@ -304,6 +308,7 @@ public function sentences($min_word_count, $capitalize = FALSE) {
    *   The number of paragraphs to create. Defaults to 12.
    *
    * @return string
+   *   A string of multiple paragraphs.
    */
   public function paragraphs($paragraph_count = 12) {
     $output = '';
diff --git a/core/phpcs.xml.dist b/core/phpcs.xml.dist
index 887121e72fa0de1001cb28e38cb787713b0ac058..71441e9c7c4bdf1d492bbb92fbe49f8b99e01353 100644
--- a/core/phpcs.xml.dist
+++ b/core/phpcs.xml.dist
@@ -87,6 +87,7 @@
   </rule>
   <rule ref="Drupal.Commenting.FunctionComment.MissingReturnComment">
     <include-pattern>core/lib/Drupal/Core/*</include-pattern>
+    <include-pattern>core/lib/Drupal/Component/*</include-pattern>
   </rule>
   <rule ref="Drupal.Commenting.GenderNeutralComment"/>
   <rule ref="Drupal.Commenting.HookComment"/>