WordPress · gziolo · Aug 8, 2025 · Aug 18, 2025 · Aug 26, 2025 · Sep 8, 2025
diff --git a/src/wp-includes/abilities-api.php b/src/wp-includes/abilities-api.php
@@ -0,0 +1,260 @@
+<?php
+/**
+ * Abilities API
+ *
+ * Defines functions for managing abilities in WordPress.
+ *
+ * @package WordPress
+ * @subpackage Abilities_API
+ * @since 6.9.0
+ */
+
+declare( strict_types = 1 );
+
+/**
+ * Registers a new ability using Abilities API.
+ *
+ * Note: Should only be used on the {@see 'wp_abilities_api_init'} hook.
+ *
+ * @since 6.9.0
+ *
+ * @see WP_Abilities_Registry::register()
+ *
+ * @param string $name The name of the ability. The name must be a string containing a namespace
+ * prefix, i.e. `my-plugin/my-ability`. It can only contain lowercase
+ * alphanumeric characters, dashes and the forward slash.
+ * @param array<string, mixed> $args {
+ * An associative array of arguments for the ability.
+ *
+ * @type string $label The human-readable label for the ability.
+ * @type string $description A detailed description of what the ability does.
+ * @type string $category The ability category slug this ability belongs to.
+ * @type callable $execute_callback A callback function to execute when the ability is invoked.
+ * Receives optional mixed input and returns mixed result or WP_Error.
+ * @type callable $permission_callback A callback function to check permissions before execution.
+ * Receives optional mixed input and returns bool or WP_Error.
+ * @type array<string, mixed> $input_schema Optional. JSON Schema definition for the ability's input.
+ * @type array<string, mixed> $output_schema Optional. JSON Schema definition for the ability's output.
+ * @type array<string, mixed> $meta {
+ * Optional. Additional metadata for the ability.
+ *
+ * @type array<string, null|bool> $annotations Optional. Annotation metadata for the ability.
+ * @type bool $show_in_rest Optional. Whether to expose this ability in the REST API. Default false.
+ * }
+ * @type string $ability_class Optional. Custom class to instantiate instead of WP_Ability.
+ * }
+ * @return WP_Ability|null An instance of registered ability on success, null on failure.
+ */
+function wp_register_ability( string $name, array $args ): ?WP_Ability {
+	if ( ! did_action( 'wp_abilities_api_init' ) ) {
+ _doing_it_wrong(
+ __FUNCTION__,
+ sprintf(
+ /* translators: 1: abilities_api_init, 2: string value of the ability name. */
+ esc_html__( 'Abilities must be registered on the %1$s action. The ability %2$s was not registered.' ),
+ '<code>abilities_api_init</code>',
+ '<code>' . esc_html( $name ) . '</code>'
+ ),
+ '6.9.0'
+ );
+ return null;
+	}
+
+	$registry = WP_Abilities_Registry::get_instance();
+	if ( null === $registry ) {
+ return null;
+	}
+
+	return $registry->register( $name, $args );
+}
+
+/**
+ * Unregisters an ability from the Abilities API.
+ *
+ * @since 6.9.0
+ *
+ * @see WP_Abilities_Registry::unregister()
+ *
+ * @param string $name The name of the registered ability, with its namespace.
+ * @return WP_Ability|null The unregistered ability instance on success, null on failure.
+ */
+function wp_unregister_ability( string $name ): ?WP_Ability {
+	$registry = WP_Abilities_Registry::get_instance();
+	if ( null === $registry ) {
+ return null;
+	}
+
+	return $registry->unregister( $name );
+}
+
+/**
+ * Checks if an ability is registered.
+ *
+ * @since 6.9.0
+ *
+ * @see WP_Abilities_Registry::is_registered()
+ *
+ * @param string $name The name of the registered ability, with its namespace.
+ * @return bool True if the ability is registered, false otherwise.
+ */
+function wp_has_ability( string $name ): bool {
+	$registry = WP_Abilities_Registry::get_instance();
+	if ( null === $registry ) {
+ return false;
+	}
+
+	return $registry->is_registered( $name );
+}
+
+/**
+ * Retrieves a registered ability using Abilities API.
+ *
+ * @since 6.9.0
+ *
+ * @see WP_Abilities_Registry::get_registered()
+ *
+ * @param string $name The name of the registered ability, with its namespace.
+ * @return WP_Ability|null The registered ability instance, or null if it is not registered.
+ */
+function wp_get_ability( string $name ): ?WP_Ability {
+	$registry = WP_Abilities_Registry::get_instance();
+	if ( null === $registry ) {
+ return null;
+	}
+
+	return $registry->get_registered( $name );
+}
+
+/**
+ * Retrieves all registered abilities using Abilities API.
+ *
+ * @since 6.9.0
+ *
+ * @see WP_Abilities_Registry::get_all_registered()
+ *
+ * @return WP_Ability[] The array of registered abilities.
+ */
+function wp_get_abilities(): array {
+	$registry = WP_Abilities_Registry::get_instance();
+	if ( null === $registry ) {
+ return array();
+	}
+
+	return $registry->get_all_registered();
+}
+
+/**
+ * Registers a new ability category.
+ *
+ * @since 6.9.0
+ *
+ * @see WP_Ability_Categories_Registry::register()
+ *
+ * @param string $slug The unique slug for the ability category. Must contain only lowercase
+ * alphanumeric characters and dashes.
+ * @param array<string, mixed> $args {
+ * An associative array of arguments for the ability category.
+ *
+ * @type string $label The human-readable label for the ability category.
+ * @type string $description A description of the ability category.
+ * @type array<string, mixed> $meta Optional. Additional metadata for the ability category.
+ * }
+ * @return WP_Ability_Category|null The registered ability category instance on success, null on failure.
+ */
+function wp_register_ability_category( string $slug, array $args ): ?WP_Ability_Category {
+	if ( ! did_action( 'wp_abilities_api_categories_init' ) ) {
+ _doing_it_wrong(
+ __METHOD__,
+ sprintf(
+ /* translators: 1: abilities_api_categories_init, 2: ability category slug. */
+ __( 'Ability categories must be registered on the %1$s action. The ability category %2$s was not registered.' ),
+ '<code>wp_abilities_api_categories_init</code>',
+ '<code>' . esc_html( $slug ) . '</code>'
+ ),
+ '6.9.0'
+ );
+ return null;
+	}
+
+	$registry = WP_Ability_Categories_Registry::get_instance();
+	if ( null === $registry ) {
+ return null;
+	}
+
+	return $registry->register( $slug, $args );
+}
+
+/**
+ * Unregisters an ability category.
+ *
+ * @since 6.9.0
+ *
+ * @see WP_Ability_Categories_Registry::unregister()
+ *
+ * @param string $slug The slug of the registered ability category.
+ * @return WP_Ability_Category|null The unregistered ability category instance on success, null on failure.
+ */
+function wp_unregister_ability_category( string $slug ): ?WP_Ability_Category {
+	$registry = WP_Ability_Categories_Registry::get_instance();
+	if ( null === $registry ) {
+ return null;
+	}
+
+	return $registry->unregister( $slug );
+}
+
+/**
+ * Checks if an ability category is registered.
+ *
+ * @since 6.9.0
+ *
+ * @see WP_Ability_Categories_Registry::is_registered()
+ *
+ * @param string $slug The slug of the ability category.
+ * @return bool True if the ability category is registered, false otherwise.
+ */
+function wp_has_ability_category( string $slug ): bool {
+	$registry = WP_Ability_Categories_Registry::get_instance();
+	if ( null === $registry ) {
+ return false;
+	}
+
+	return $registry->is_registered( $slug );
+}
+
+/**
+ * Retrieves a registered ability category.
+ *
+ * @since 6.9.0
+ *
+ * @see WP_Ability_Categories_Registry::get_registered()
+ *
+ * @param string $slug The slug of the registered ability category.
+ * @return WP_Ability_Category|null The registered ability category instance, or null if it is not registered.
+ */
+function wp_get_ability_category( string $slug ): ?WP_Ability_Category {
+	$registry = WP_Ability_Categories_Registry::get_instance();
+	if ( null === $registry ) {
+ return null;
+	}
+
+	return $registry->get_registered( $slug );
+}
+
+/**
+ * Retrieves all registered ability categories.
+ *
+ * @since 6.9.0
+ *
+ * @see WP_Ability_Categories_Registry::get_all_registered()
+ *
+ * @return WP_Ability_Category[] The array of registered ability categories.
+ */
+function wp_get_ability_categories(): array {
+	$registry = WP_Ability_Categories_Registry::get_instance();
+	if ( null === $registry ) {
+ return array();
+	}
+
+	return $registry->get_all_registered();
+}
diff --git a/src/wp-includes/abilities-api.php b/src/wp-includes/abilities-api.php
@@ -0,0 +1,260 @@
+<?php
+/**
+ * Abilities API
+ *
+ * Defines functions for managing abilities in WordPress.
+ *
+ * @package WordPress
+ * @subpackage Abilities_API
+ * @since 6.9.0
+ */
+
+declare( strict_types = 1 );
+
+/**
+ * Registers a new ability using Abilities API.
+ *
+ * Note: Should only be used on the {@see 'wp_abilities_api_init'} hook.
+ *
+ * @since 6.9.0
+ *
+ * @see WP_Abilities_Registry::register()
+ *
+ * @param string $name The name of the ability. The name must be a string containing a namespace
+ * prefix, i.e. `my-plugin/my-ability`. It can only contain lowercase
+ * alphanumeric characters, dashes and the forward slash.
+ * @param array<string, mixed> $args {
+ * An associative array of arguments for the ability.
+ *
+ * @type string $label The human-readable label for the ability.
+ * @type string $description A detailed description of what the ability does.
+ * @type string $category The ability category slug this ability belongs to.
+ * @type callable $execute_callback A callback function to execute when the ability is invoked.
+ * Receives optional mixed input and returns mixed result or WP_Error.
+ * @type callable $permission_callback A callback function to check permissions before execution.
+ * Receives optional mixed input and returns bool or WP_Error.
+ * @type array<string, mixed> $input_schema Optional. JSON Schema definition for the ability's input.
+ * @type array<string, mixed> $output_schema Optional. JSON Schema definition for the ability's output.
+ * @type array<string, mixed> $meta {
+ * Optional. Additional metadata for the ability.
+ *
+ * @type array<string, null|bool> $annotations Optional. Annotation metadata for the ability.
+ * @type bool $show_in_rest Optional. Whether to expose this ability in the REST API. Default false.
+ * }
+ * @type string $ability_class Optional. Custom class to instantiate instead of WP_Ability.
+ * }
+ * @return WP_Ability|null An instance of registered ability on success, null on failure.
+ */
+function wp_register_ability( string $name, array $args ): ?WP_Ability {
+	if ( ! did_action( 'wp_abilities_api_init' ) ) {
+ _doing_it_wrong(
+ __FUNCTION__,
+ sprintf(
+ /* translators: 1: abilities_api_init, 2: string value of the ability name. */
+ esc_html__( 'Abilities must be registered on the %1$s action. The ability %2$s was not registered.' ),
+ '<code>abilities_api_init</code>',
+ '<code>' . esc_html( $name ) . '</code>'
+ ),
+ '6.9.0'
+ );
+ return null;
+	}
+
+	$registry = WP_Abilities_Registry::get_instance();
+	if ( null === $registry ) {
+ return null;
+	}
+
+	return $registry->register( $name, $args );
+}
+
+/**
+ * Unregisters an ability from the Abilities API.
+ *
+ * @since 6.9.0
+ *
+ * @see WP_Abilities_Registry::unregister()
+ *
+ * @param string $name The name of the registered ability, with its namespace.
+ * @return WP_Ability|null The unregistered ability instance on success, null on failure.
+ */
+function wp_unregister_ability( string $name ): ?WP_Ability {
+	$registry = WP_Abilities_Registry::get_instance();
+	if ( null === $registry ) {
+ return null;
+	}
+
+	return $registry->unregister( $name );
+}
+
+/**
+ * Checks if an ability is registered.
+ *
+ * @since 6.9.0
+ *
+ * @see WP_Abilities_Registry::is_registered()
+ *
+ * @param string $name The name of the registered ability, with its namespace.
+ * @return bool True if the ability is registered, false otherwise.
+ */
+function wp_has_ability( string $name ): bool {
+	$registry = WP_Abilities_Registry::get_instance();
+	if ( null === $registry ) {
+ return false;
+	}
+
+	return $registry->is_registered( $name );
+}
+
+/**
+ * Retrieves a registered ability using Abilities API.
+ *
+ * @since 6.9.0
+ *
+ * @see WP_Abilities_Registry::get_registered()
+ *
+ * @param string $name The name of the registered ability, with its namespace.
+ * @return WP_Ability|null The registered ability instance, or null if it is not registered.
+ */
+function wp_get_ability( string $name ): ?WP_Ability {
+	$registry = WP_Abilities_Registry::get_instance();
+	if ( null === $registry ) {
+ return null;
+	}
+
+	return $registry->get_registered( $name );
+}
+
+/**
+ * Retrieves all registered abilities using Abilities API.
+ *
+ * @since 6.9.0
+ *
+ * @see WP_Abilities_Registry::get_all_registered()
+ *
+ * @return WP_Ability[] The array of registered abilities.
+ */
+function wp_get_abilities(): array {
+	$registry = WP_Abilities_Registry::get_instance();
+	if ( null === $registry ) {
+ return array();
+	}
+
+	return $registry->get_all_registered();
+}
+
+/**
+ * Registers a new ability category.
+ *
+ * @since 6.9.0
+ *
+ * @see WP_Ability_Categories_Registry::register()
+ *
+ * @param string $slug The unique slug for the ability category. Must contain only lowercase
+ * alphanumeric characters and dashes.
+ * @param array<string, mixed> $args {
+ * An associative array of arguments for the ability category.
+ *
+ * @type string $label The human-readable label for the ability category.
+ * @type string $description A description of the ability category.
+ * @type array<string, mixed> $meta Optional. Additional metadata for the ability category.
+ * }
+ * @return WP_Ability_Category|null The registered ability category instance on success, null on failure.
+ */
+function wp_register_ability_category( string $slug, array $args ): ?WP_Ability_Category {
+	if ( ! did_action( 'wp_abilities_api_categories_init' ) ) {
+ _doing_it_wrong(
+ __METHOD__,
+ sprintf(
+ /* translators: 1: abilities_api_categories_init, 2: ability category slug. */
+ __( 'Ability categories must be registered on the %1$s action. The ability category %2$s was not registered.' ),
+ '<code>wp_abilities_api_categories_init</code>',
+ '<code>' . esc_html( $slug ) . '</code>'
+ ),
+ '6.9.0'
+ );
+ return null;
+	}
+
+	$registry = WP_Ability_Categories_Registry::get_instance();
+	if ( null === $registry ) {
+ return null;
+	}
+
+	return $registry->register( $slug, $args );
+}
+
+/**
+ * Unregisters an ability category.
+ *
+ * @since 6.9.0
+ *
+ * @see WP_Ability_Categories_Registry::unregister()
+ *
+ * @param string $slug The slug of the registered ability category.
+ * @return WP_Ability_Category|null The unregistered ability category instance on success, null on failure.
+ */
+function wp_unregister_ability_category( string $slug ): ?WP_Ability_Category {
+	$registry = WP_Ability_Categories_Registry::get_instance();
+	if ( null === $registry ) {
+ return null;
+	}
+
+	return $registry->unregister( $slug );
+}
+
+/**
+ * Checks if an ability category is registered.
+ *
+ * @since 6.9.0
+ *
+ * @see WP_Ability_Categories_Registry::is_registered()
+ *
+ * @param string $slug The slug of the ability category.
+ * @return bool True if the ability category is registered, false otherwise.
+ */
+function wp_has_ability_category( string $slug ): bool {
+	$registry = WP_Ability_Categories_Registry::get_instance();
+	if ( null === $registry ) {
+ return false;
+	}
+
+	return $registry->is_registered( $slug );
+}
+
+/**
+ * Retrieves a registered ability category.
+ *
+ * @since 6.9.0
+ *
+ * @see WP_Ability_Categories_Registry::get_registered()
+ *
+ * @param string $slug The slug of the registered ability category.
+ * @return WP_Ability_Category|null The registered ability category instance, or null if it is not registered.
+ */
+function wp_get_ability_category( string $slug ): ?WP_Ability_Category {
+	$registry = WP_Ability_Categories_Registry::get_instance();
+	if ( null === $registry ) {
+ return null;
+	}
+
+	return $registry->get_registered( $slug );
+}
+
+/**
+ * Retrieves all registered ability categories.
+ *
+ * @since 6.9.0
+ *
+ * @see WP_Ability_Categories_Registry::get_all_registered()
+ *
+ * @return WP_Ability_Category[] The array of registered ability categories.
+ */
+function wp_get_ability_categories(): array {
+	$registry = WP_Ability_Categories_Registry::get_instance();
+	if ( null === $registry ) {
+ return array();
+	}
+
+	return $registry->get_all_registered();
+}
diff --git a/src/wp-includes/abilities-api.php b/src/wp-includes/abilities-api.php
@@ -0,0 +1,260 @@
+<?php
+/**
+ * Abilities API
+ *
+ * Defines functions for managing abilities in WordPress.
+ *
+ * @package WordPress
+ * @subpackage Abilities_API
+ * @since 6.9.0
+ */
+
+declare( strict_types = 1 );
+
+/**
+ * Registers a new ability using Abilities API.
+ *
+ * Note: Should only be used on the {@see 'wp_abilities_api_init'} hook.
+ *
+ * @since 6.9.0
+ *
+ * @see WP_Abilities_Registry::register()
+ *
+ * @param string $name The name of the ability. The name must be a string containing a namespace
+ * prefix, i.e. `my-plugin/my-ability`. It can only contain lowercase
+ * alphanumeric characters, dashes and the forward slash.
+ * @param array<string, mixed> $args {
+ * An associative array of arguments for the ability.
+ *
+ * @type string $label The human-readable label for the ability.
+ * @type string $description A detailed description of what the ability does.
+ * @type string $category The ability category slug this ability belongs to.
+ * @type callable $execute_callback A callback function to execute when the ability is invoked.
+ * Receives optional mixed input and returns mixed result or WP_Error.
+ * @type callable $permission_callback A callback function to check permissions before execution.
+ * Receives optional mixed input and returns bool or WP_Error.
+ * @type array<string, mixed> $input_schema Optional. JSON Schema definition for the ability's input.
+ * @type array<string, mixed> $output_schema Optional. JSON Schema definition for the ability's output.
+ * @type array<string, mixed> $meta {
+ * Optional. Additional metadata for the ability.
+ *
+ * @type array<string, null|bool> $annotations Optional. Annotation metadata for the ability.
+ * @type bool $show_in_rest Optional. Whether to expose this ability in the REST API. Default false.
+ * }
+ * @type string $ability_class Optional. Custom class to instantiate instead of WP_Ability.
+ * }
+ * @return WP_Ability|null An instance of registered ability on success, null on failure.
+ */
+function wp_register_ability( string $name, array $args ): ?WP_Ability {
+	if ( ! did_action( 'wp_abilities_api_init' ) ) {
+ _doing_it_wrong(
+ __FUNCTION__,
+ sprintf(
+ /* translators: 1: abilities_api_init, 2: string value of the ability name. */
+ esc_html__( 'Abilities must be registered on the %1$s action. The ability %2$s was not registered.' ),
+ '<code>abilities_api_init</code>',
+ '<code>' . esc_html( $name ) . '</code>'
+ ),
+ '6.9.0'
+ );
+ return null;
+	}
+
+	$registry = WP_Abilities_Registry::get_instance();
+	if ( null === $registry ) {
+ return null;
+	}
+
+	return $registry->register( $name, $args );
+}
+
+/**
+ * Unregisters an ability from the Abilities API.
+ *
+ * @since 6.9.0
+ *
+ * @see WP_Abilities_Registry::unregister()
+ *
+ * @param string $name The name of the registered ability, with its namespace.
+ * @return WP_Ability|null The unregistered ability instance on success, null on failure.
+ */
+function wp_unregister_ability( string $name ): ?WP_Ability {
+	$registry = WP_Abilities_Registry::get_instance();
+	if ( null === $registry ) {
+ return null;
+	}
+
+	return $registry->unregister( $name );
+}
+
+/**
+ * Checks if an ability is registered.
+ *
+ * @since 6.9.0
+ *
+ * @see WP_Abilities_Registry::is_registered()
+ *
+ * @param string $name The name of the registered ability, with its namespace.
+ * @return bool True if the ability is registered, false otherwise.
+ */
+function wp_has_ability( string $name ): bool {
+	$registry = WP_Abilities_Registry::get_instance();
+	if ( null === $registry ) {
+ return false;
+	}
+
+	return $registry->is_registered( $name );
+}
+
+/**
+ * Retrieves a registered ability using Abilities API.
+ *
+ * @since 6.9.0
+ *
+ * @see WP_Abilities_Registry::get_registered()
+ *
+ * @param string $name The name of the registered ability, with its namespace.
+ * @return WP_Ability|null The registered ability instance, or null if it is not registered.
+ */
+function wp_get_ability( string $name ): ?WP_Ability {
+	$registry = WP_Abilities_Registry::get_instance();
+	if ( null === $registry ) {
+ return null;
+	}
+
+	return $registry->get_registered( $name );
+}
+
+/**
+ * Retrieves all registered abilities using Abilities API.
+ *
+ * @since 6.9.0
+ *
+ * @see WP_Abilities_Registry::get_all_registered()
+ *
+ * @return WP_Ability[] The array of registered abilities.
+ */
+function wp_get_abilities(): array {
+	$registry = WP_Abilities_Registry::get_instance();
+	if ( null === $registry ) {
+ return array();
+	}
+
+	return $registry->get_all_registered();
+}
+
+/**
+ * Registers a new ability category.
+ *
+ * @since 6.9.0
+ *
+ * @see WP_Ability_Categories_Registry::register()
+ *
+ * @param string $slug The unique slug for the ability category. Must contain only lowercase
+ * alphanumeric characters and dashes.
+ * @param array<string, mixed> $args {
+ * An associative array of arguments for the ability category.
+ *
+ * @type string $label The human-readable label for the ability category.
+ * @type string $description A description of the ability category.
+ * @type array<string, mixed> $meta Optional. Additional metadata for the ability category.
+ * }
+ * @return WP_Ability_Category|null The registered ability category instance on success, null on failure.
+ */
+function wp_register_ability_category( string $slug, array $args ): ?WP_Ability_Category {
+	if ( ! did_action( 'wp_abilities_api_categories_init' ) ) {
+ _doing_it_wrong(
+ __METHOD__,
+ sprintf(
+ /* translators: 1: abilities_api_categories_init, 2: ability category slug. */
+ __( 'Ability categories must be registered on the %1$s action. The ability category %2$s was not registered.' ),
+ '<code>wp_abilities_api_categories_init</code>',
+ '<code>' . esc_html( $slug ) . '</code>'
+ ),
+ '6.9.0'
+ );
+ return null;
+	}
+
+	$registry = WP_Ability_Categories_Registry::get_instance();
+	if ( null === $registry ) {
+ return null;
+	}
+
+	return $registry->register( $slug, $args );
+}
+
+/**
+ * Unregisters an ability category.
+ *
+ * @since 6.9.0
+ *
+ * @see WP_Ability_Categories_Registry::unregister()
+ *
+ * @param string $slug The slug of the registered ability category.
+ * @return WP_Ability_Category|null The unregistered ability category instance on success, null on failure.
+ */
+function wp_unregister_ability_category( string $slug ): ?WP_Ability_Category {
+	$registry = WP_Ability_Categories_Registry::get_instance();
+	if ( null === $registry ) {
+ return null;
+	}
+
+	return $registry->unregister( $slug );
+}
+
+/**
+ * Checks if an ability category is registered.
+ *
+ * @since 6.9.0
+ *
+ * @see WP_Ability_Categories_Registry::is_registered()
+ *
+ * @param string $slug The slug of the ability category.
+ * @return bool True if the ability category is registered, false otherwise.
+ */
+function wp_has_ability_category( string $slug ): bool {
+	$registry = WP_Ability_Categories_Registry::get_instance();
+	if ( null === $registry ) {
+ return false;
+	}
+
+	return $registry->is_registered( $slug );
+}
+
+/**
+ * Retrieves a registered ability category.
+ *
+ * @since 6.9.0
+ *
+ * @see WP_Ability_Categories_Registry::get_registered()
+ *
+ * @param string $slug The slug of the registered ability category.
+ * @return WP_Ability_Category|null The registered ability category instance, or null if it is not registered.
+ */
+function wp_get_ability_category( string $slug ): ?WP_Ability_Category {
+	$registry = WP_Ability_Categories_Registry::get_instance();
+	if ( null === $registry ) {
+ return null;
+	}
+
+	return $registry->get_registered( $slug );
+}
+
+/**
+ * Retrieves all registered ability categories.
+ *
+ * @since 6.9.0
+ *
+ * @see WP_Ability_Categories_Registry::get_all_registered()
+ *
+ * @return WP_Ability_Category[] The array of registered ability categories.
+ */
+function wp_get_ability_categories(): array {
+	$registry = WP_Ability_Categories_Registry::get_instance();
+	if ( null === $registry ) {
+ return array();
+	}
+
+	return $registry->get_all_registered();
+}
diff --git a/src/wp-includes/abilities-api.php b/src/wp-includes/abilities-api.php
@@ -0,0 +1,260 @@
+<?php
+/**
+ * Abilities API
+ *
+ * Defines functions for managing abilities in WordPress.
+ *
+ * @package WordPress
+ * @subpackage Abilities_API
+ * @since 6.9.0
+ */
+
+declare( strict_types = 1 );
+
+/**
+ * Registers a new ability using Abilities API.
+ *
+ * Note: Should only be used on the {@see 'wp_abilities_api_init'} hook.
+ *
+ * @since 6.9.0
+ *
+ * @see WP_Abilities_Registry::register()
+ *
+ * @param string $name The name of the ability. The name must be a string containing a namespace
+ * prefix, i.e. `my-plugin/my-ability`. It can only contain lowercase
+ * alphanumeric characters, dashes and the forward slash.
+ * @param array<string, mixed> $args {
+ * An associative array of arguments for the ability.
+ *
+ * @type string $label The human-readable label for the ability.
+ * @type string $description A detailed description of what the ability does.
+ * @type string $category The ability category slug this ability belongs to.
+ * @type callable $execute_callback A callback function to execute when the ability is invoked.
+ * Receives optional mixed input and returns mixed result or WP_Error.
+ * @type callable $permission_callback A callback function to check permissions before execution.
+ * Receives optional mixed input and returns bool or WP_Error.
+ * @type array<string, mixed> $input_schema Optional. JSON Schema definition for the ability's input.
+ * @type array<string, mixed> $output_schema Optional. JSON Schema definition for the ability's output.
+ * @type array<string, mixed> $meta {
+ * Optional. Additional metadata for the ability.
+ *
+ * @type array<string, null|bool> $annotations Optional. Annotation metadata for the ability.
+ * @type bool $show_in_rest Optional. Whether to expose this ability in the REST API. Default false.
+ * }
+ * @type string $ability_class Optional. Custom class to instantiate instead of WP_Ability.
+ * }
+ * @return WP_Ability|null An instance of registered ability on success, null on failure.
+ */
+function wp_register_ability( string $name, array $args ): ?WP_Ability {
+	if ( ! did_action( 'wp_abilities_api_init' ) ) {
+ _doing_it_wrong(
+ __FUNCTION__,
+ sprintf(
+ /* translators: 1: abilities_api_init, 2: string value of the ability name. */
+ esc_html__( 'Abilities must be registered on the %1$s action. The ability %2$s was not registered.' ),
+ '<code>abilities_api_init</code>',
+ '<code>' . esc_html( $name ) . '</code>'
+ ),
+ '6.9.0'
+ );
+ return null;
+	}
+
+	$registry = WP_Abilities_Registry::get_instance();
+	if ( null === $registry ) {
+ return null;
+	}
+
+	return $registry->register( $name, $args );
+}
+
+/**
+ * Unregisters an ability from the Abilities API.
+ *
+ * @since 6.9.0
+ *
+ * @see WP_Abilities_Registry::unregister()
+ *
+ * @param string $name The name of the registered ability, with its namespace.
+ * @return WP_Ability|null The unregistered ability instance on success, null on failure.
+ */
+function wp_unregister_ability( string $name ): ?WP_Ability {
+	$registry = WP_Abilities_Registry::get_instance();
+	if ( null === $registry ) {
+ return null;
+	}
+
+	return $registry->unregister( $name );
+}
+
+/**
+ * Checks if an ability is registered.
+ *
+ * @since 6.9.0
+ *
+ * @see WP_Abilities_Registry::is_registered()
+ *
+ * @param string $name The name of the registered ability, with its namespace.
+ * @return bool True if the ability is registered, false otherwise.
+ */
+function wp_has_ability( string $name ): bool {
+	$registry = WP_Abilities_Registry::get_instance();
+	if ( null === $registry ) {
+ return false;
+	}
+
+	return $registry->is_registered( $name );
+}
+
+/**
+ * Retrieves a registered ability using Abilities API.
+ *
+ * @since 6.9.0
+ *
+ * @see WP_Abilities_Registry::get_registered()
+ *
+ * @param string $name The name of the registered ability, with its namespace.
+ * @return WP_Ability|null The registered ability instance, or null if it is not registered.
+ */
+function wp_get_ability( string $name ): ?WP_Ability {
+	$registry = WP_Abilities_Registry::get_instance();
+	if ( null === $registry ) {
+ return null;
+	}
+
+	return $registry->get_registered( $name );
+}
+
+/**
+ * Retrieves all registered abilities using Abilities API.
+ *
+ * @since 6.9.0
+ *
+ * @see WP_Abilities_Registry::get_all_registered()
+ *
+ * @return WP_Ability[] The array of registered abilities.
+ */
+function wp_get_abilities(): array {
+	$registry = WP_Abilities_Registry::get_instance();
+	if ( null === $registry ) {
+ return array();
+	}
+
+	return $registry->get_all_registered();
+}
+
+/**
+ * Registers a new ability category.
+ *
+ * @since 6.9.0
+ *
+ * @see WP_Ability_Categories_Registry::register()
+ *
+ * @param string $slug The unique slug for the ability category. Must contain only lowercase
+ * alphanumeric characters and dashes.
+ * @param array<string, mixed> $args {
+ * An associative array of arguments for the ability category.
+ *
+ * @type string $label The human-readable label for the ability category.
+ * @type string $description A description of the ability category.
+ * @type array<string, mixed> $meta Optional. Additional metadata for the ability category.
+ * }
+ * @return WP_Ability_Category|null The registered ability category instance on success, null on failure.
+ */
+function wp_register_ability_category( string $slug, array $args ): ?WP_Ability_Category {
+	if ( ! did_action( 'wp_abilities_api_categories_init' ) ) {
+ _doing_it_wrong(
+ __METHOD__,
+ sprintf(
+ /* translators: 1: abilities_api_categories_init, 2: ability category slug. */
+ __( 'Ability categories must be registered on the %1$s action. The ability category %2$s was not registered.' ),
+ '<code>wp_abilities_api_categories_init</code>',
+ '<code>' . esc_html( $slug ) . '</code>'
+ ),
+ '6.9.0'
+ );
+ return null;
+	}
+
+	$registry = WP_Ability_Categories_Registry::get_instance();
+	if ( null === $registry ) {
+ return null;
+	}
+
+	return $registry->register( $slug, $args );
+}
+
+/**
+ * Unregisters an ability category.
+ *
+ * @since 6.9.0
+ *
+ * @see WP_Ability_Categories_Registry::unregister()
+ *
+ * @param string $slug The slug of the registered ability category.
+ * @return WP_Ability_Category|null The unregistered ability category instance on success, null on failure.
+ */
+function wp_unregister_ability_category( string $slug ): ?WP_Ability_Category {
+	$registry = WP_Ability_Categories_Registry::get_instance();
+	if ( null === $registry ) {
+ return null;
+	}
+
+	return $registry->unregister( $slug );
+}
+
+/**
+ * Checks if an ability category is registered.
+ *
+ * @since 6.9.0
+ *
+ * @see WP_Ability_Categories_Registry::is_registered()
+ *
+ * @param string $slug The slug of the ability category.
+ * @return bool True if the ability category is registered, false otherwise.
+ */
+function wp_has_ability_category( string $slug ): bool {
+	$registry = WP_Ability_Categories_Registry::get_instance();
+	if ( null === $registry ) {
+ return false;
+	}
+
+	return $registry->is_registered( $slug );
+}
+
+/**
+ * Retrieves a registered ability category.
+ *
+ * @since 6.9.0
+ *
+ * @see WP_Ability_Categories_Registry::get_registered()
+ *
+ * @param string $slug The slug of the registered ability category.
+ * @return WP_Ability_Category|null The registered ability category instance, or null if it is not registered.
+ */
+function wp_get_ability_category( string $slug ): ?WP_Ability_Category {
+	$registry = WP_Ability_Categories_Registry::get_instance();
+	if ( null === $registry ) {
+ return null;
+	}
+
+	return $registry->get_registered( $slug );
+}
+
+/**
+ * Retrieves all registered ability categories.
+ *
+ * @since 6.9.0
+ *
+ * @see WP_Ability_Categories_Registry::get_all_registered()
+ *
+ * @return WP_Ability_Category[] The array of registered ability categories.
+ */
+function wp_get_ability_categories(): array {
+	$registry = WP_Ability_Categories_Registry::get_instance();
+	if ( null === $registry ) {
+ return array();
+	}
+
+	return $registry->get_all_registered();
+}
diff --git a/src/wp-includes/abilities-api.php b/src/wp-includes/abilities-api.php
@@ -0,0 +1,260 @@
+<?php
+/**
+ * Abilities API
+ *
+ * Defines functions for managing abilities in WordPress.
+ *
+ * @package WordPress
+ * @subpackage Abilities_API
+ * @since 6.9.0
+ */
+
+declare( strict_types = 1 );
+
+/**
+ * Registers a new ability using Abilities API.
+ *
+ * Note: Should only be used on the {@see 'wp_abilities_api_init'} hook.
+ *
+ * @since 6.9.0
+ *
+ * @see WP_Abilities_Registry::register()
+ *
+ * @param string $name The name of the ability. The name must be a string containing a namespace
+ * prefix, i.e. `my-plugin/my-ability`. It can only contain lowercase
+ * alphanumeric characters, dashes and the forward slash.
+ * @param array<string, mixed> $args {
+ * An associative array of arguments for the ability.
+ *
+ * @type string $label The human-readable label for the ability.
+ * @type string $description A detailed description of what the ability does.
+ * @type string $category The ability category slug this ability belongs to.
+ * @type callable $execute_callback A callback function to execute when the ability is invoked.
+ * Receives optional mixed input and returns mixed result or WP_Error.
+ * @type callable $permission_callback A callback function to check permissions before execution.
+ * Receives optional mixed input and returns bool or WP_Error.
+ * @type array<string, mixed> $input_schema Optional. JSON Schema definition for the ability's input.
+ * @type array<string, mixed> $output_schema Optional. JSON Schema definition for the ability's output.
+ * @type array<string, mixed> $meta {
+ * Optional. Additional metadata for the ability.
+ *
+ * @type array<string, null|bool> $annotations Optional. Annotation metadata for the ability.
+ * @type bool $show_in_rest Optional. Whether to expose this ability in the REST API. Default false.
+ * }
+ * @type string $ability_class Optional. Custom class to instantiate instead of WP_Ability.
+ * }
+ * @return WP_Ability|null An instance of registered ability on success, null on failure.
+ */
+function wp_register_ability( string $name, array $args ): ?WP_Ability {
+	if ( ! did_action( 'wp_abilities_api_init' ) ) {
+ _doing_it_wrong(
+ __FUNCTION__,
+ sprintf(
+ /* translators: 1: abilities_api_init, 2: string value of the ability name. */
+ esc_html__( 'Abilities must be registered on the %1$s action. The ability %2$s was not registered.' ),
+ '<code>abilities_api_init</code>',
+ '<code>' . esc_html( $name ) . '</code>'
+ ),
+ '6.9.0'
+ );
+ return null;
+	}
+
+	$registry = WP_Abilities_Registry::get_instance();
+	if ( null === $registry ) {
+ return null;
+	}
+
+	return $registry->register( $name, $args );
+}
+
+/**
+ * Unregisters an ability from the Abilities API.
+ *
+ * @since 6.9.0
+ *
+ * @see WP_Abilities_Registry::unregister()
+ *
+ * @param string $name The name of the registered ability, with its namespace.
+ * @return WP_Ability|null The unregistered ability instance on success, null on failure.
+ */
+function wp_unregister_ability( string $name ): ?WP_Ability {
+	$registry = WP_Abilities_Registry::get_instance();
+	if ( null === $registry ) {
+ return null;
+	}
+
+	return $registry->unregister( $name );
+}
+
+/**
+ * Checks if an ability is registered.
+ *
+ * @since 6.9.0
+ *
+ * @see WP_Abilities_Registry::is_registered()
+ *
+ * @param string $name The name of the registered ability, with its namespace.
+ * @return bool True if the ability is registered, false otherwise.
+ */
+function wp_has_ability( string $name ): bool {
+	$registry = WP_Abilities_Registry::get_instance();
+	if ( null === $registry ) {
+ return false;
+	}
+
+	return $registry->is_registered( $name );
+}
+
+/**
+ * Retrieves a registered ability using Abilities API.
+ *
+ * @since 6.9.0
+ *
+ * @see WP_Abilities_Registry::get_registered()
+ *
+ * @param string $name The name of the registered ability, with its namespace.
+ * @return WP_Ability|null The registered ability instance, or null if it is not registered.
+ */
+function wp_get_ability( string $name ): ?WP_Ability {
+	$registry = WP_Abilities_Registry::get_instance();
+	if ( null === $registry ) {
+ return null;
+	}
+
+	return $registry->get_registered( $name );
+}
+
+/**
+ * Retrieves all registered abilities using Abilities API.
+ *
+ * @since 6.9.0
+ *
+ * @see WP_Abilities_Registry::get_all_registered()
+ *
+ * @return WP_Ability[] The array of registered abilities.
+ */
+function wp_get_abilities(): array {
+	$registry = WP_Abilities_Registry::get_instance();
+	if ( null === $registry ) {
+ return array();
+	}
+
+	return $registry->get_all_registered();
+}
+
+/**
+ * Registers a new ability category.
+ *
+ * @since 6.9.0
+ *
+ * @see WP_Ability_Categories_Registry::register()
+ *
+ * @param string $slug The unique slug for the ability category. Must contain only lowercase
+ * alphanumeric characters and dashes.
+ * @param array<string, mixed> $args {
+ * An associative array of arguments for the ability category.
+ *
+ * @type string $label The human-readable label for the ability category.
+ * @type string $description A description of the ability category.
+ * @type array<string, mixed> $meta Optional. Additional metadata for the ability category.
+ * }
+ * @return WP_Ability_Category|null The registered ability category instance on success, null on failure.
+ */
+function wp_register_ability_category( string $slug, array $args ): ?WP_Ability_Category {
+	if ( ! did_action( 'wp_abilities_api_categories_init' ) ) {
+ _doing_it_wrong(
+ __METHOD__,
+ sprintf(
+ /* translators: 1: abilities_api_categories_init, 2: ability category slug. */
+ __( 'Ability categories must be registered on the %1$s action. The ability category %2$s was not registered.' ),
+ '<code>wp_abilities_api_categories_init</code>',
+ '<code>' . esc_html( $slug ) . '</code>'
+ ),
+ '6.9.0'
+ );
+ return null;
+	}
+
+	$registry = WP_Ability_Categories_Registry::get_instance();
+	if ( null === $registry ) {
+ return null;
+	}
+
+	return $registry->register( $slug, $args );
+}
+
+/**
+ * Unregisters an ability category.
+ *
+ * @since 6.9.0
+ *
+ * @see WP_Ability_Categories_Registry::unregister()
+ *
+ * @param string $slug The slug of the registered ability category.
+ * @return WP_Ability_Category|null The unregistered ability category instance on success, null on failure.
+ */
+function wp_unregister_ability_category( string $slug ): ?WP_Ability_Category {
+	$registry = WP_Ability_Categories_Registry::get_instance();
+	if ( null === $registry ) {
+ return null;
+	}
+
+	return $registry->unregister( $slug );
+}
+
+/**
+ * Checks if an ability category is registered.
+ *
+ * @since 6.9.0
+ *
+ * @see WP_Ability_Categories_Registry::is_registered()
+ *
+ * @param string $slug The slug of the ability category.
+ * @return bool True if the ability category is registered, false otherwise.
+ */
+function wp_has_ability_category( string $slug ): bool {
+	$registry = WP_Ability_Categories_Registry::get_instance();
+	if ( null === $registry ) {
+ return false;
+	}
+
+	return $registry->is_registered( $slug );
+}
+
+/**
+ * Retrieves a registered ability category.
+ *
+ * @since 6.9.0
+ *
+ * @see WP_Ability_Categories_Registry::get_registered()
+ *
+ * @param string $slug The slug of the registered ability category.
+ * @return WP_Ability_Category|null The registered ability category instance, or null if it is not registered.
+ */
+function wp_get_ability_category( string $slug ): ?WP_Ability_Category {
+	$registry = WP_Ability_Categories_Registry::get_instance();
+	if ( null === $registry ) {
+ return null;
+	}
+
+	return $registry->get_registered( $slug );
+}
+
+/**
+ * Retrieves all registered ability categories.
+ *
+ * @since 6.9.0
+ *
+ * @see WP_Ability_Categories_Registry::get_all_registered()
+ *
+ * @return WP_Ability_Category[] The array of registered ability categories.
+ */
+function wp_get_ability_categories(): array {
+	$registry = WP_Ability_Categories_Registry::get_instance();
+	if ( null === $registry ) {
+ return array();
+	}
+
+	return $registry->get_all_registered();
+}
diff --git a/src/wp-includes/abilities-api.php b/src/wp-includes/abilities-api.php
@@ -0,0 +1,260 @@
+<?php
+/**
+ * Abilities API
+ *
+ * Defines functions for managing abilities in WordPress.
+ *
+ * @package WordPress
+ * @subpackage Abilities_API
+ * @since 6.9.0
+ */
+
+declare( strict_types = 1 );
+
+/**
+ * Registers a new ability using Abilities API.
+ *
+ * Note: Should only be used on the {@see 'wp_abilities_api_init'} hook.
+ *
+ * @since 6.9.0
+ *
+ * @see WP_Abilities_Registry::register()
+ *
+ * @param string $name The name of the ability. The name must be a string containing a namespace
+ * prefix, i.e. `my-plugin/my-ability`. It can only contain lowercase
+ * alphanumeric characters, dashes and the forward slash.
+ * @param array<string, mixed> $args {
+ * An associative array of arguments for the ability.
+ *
+ * @type string $label The human-readable label for the ability.
+ * @type string $description A detailed description of what the ability does.
+ * @type string $category The ability category slug this ability belongs to.
+ * @type callable $execute_callback A callback function to execute when the ability is invoked.
+ * Receives optional mixed input and returns mixed result or WP_Error.
+ * @type callable $permission_callback A callback function to check permissions before execution.
+ * Receives optional mixed input and returns bool or WP_Error.
+ * @type array<string, mixed> $input_schema Optional. JSON Schema definition for the ability's input.
+ * @type array<string, mixed> $output_schema Optional. JSON Schema definition for the ability's output.
+ * @type array<string, mixed> $meta {
+ * Optional. Additional metadata for the ability.
+ *
+ * @type array<string, null|bool> $annotations Optional. Annotation metadata for the ability.
+ * @type bool $show_in_rest Optional. Whether to expose this ability in the REST API. Default false.
+ * }
+ * @type string $ability_class Optional. Custom class to instantiate instead of WP_Ability.
+ * }
+ * @return WP_Ability|null An instance of registered ability on success, null on failure.
+ */
+function wp_register_ability( string $name, array $args ): ?WP_Ability {
+	if ( ! did_action( 'wp_abilities_api_init' ) ) {
+ _doing_it_wrong(
+ __FUNCTION__,
+ sprintf(
+ /* translators: 1: abilities_api_init, 2: string value of the ability name. */
+ esc_html__( 'Abilities must be registered on the %1$s action. The ability %2$s was not registered.' ),
+ '<code>abilities_api_init</code>',
+ '<code>' . esc_html( $name ) . '</code>'
+ ),
+ '6.9.0'
+ );
+ return null;
+	}
+
+	$registry = WP_Abilities_Registry::get_instance();
+	if ( null === $registry ) {
+ return null;
+	}
+
+	return $registry->register( $name, $args );
+}
+
+/**
+ * Unregisters an ability from the Abilities API.
+ *
+ * @since 6.9.0
+ *
+ * @see WP_Abilities_Registry::unregister()
+ *
+ * @param string $name The name of the registered ability, with its namespace.
+ * @return WP_Ability|null The unregistered ability instance on success, null on failure.
+ */
+function wp_unregister_ability( string $name ): ?WP_Ability {
+	$registry = WP_Abilities_Registry::get_instance();
+	if ( null === $registry ) {
+ return null;
+	}
+
+	return $registry->unregister( $name );
+}
+
+/**
+ * Checks if an ability is registered.
+ *
+ * @since 6.9.0
+ *
+ * @see WP_Abilities_Registry::is_registered()
+ *
+ * @param string $name The name of the registered ability, with its namespace.
+ * @return bool True if the ability is registered, false otherwise.
+ */
+function wp_has_ability( string $name ): bool {
+	$registry = WP_Abilities_Registry::get_instance();
+	if ( null === $registry ) {
+ return false;
+	}
+
+	return $registry->is_registered( $name );
+}
+
+/**
+ * Retrieves a registered ability using Abilities API.
+ *
+ * @since 6.9.0
+ *
+ * @see WP_Abilities_Registry::get_registered()
+ *
+ * @param string $name The name of the registered ability, with its namespace.
+ * @return WP_Ability|null The registered ability instance, or null if it is not registered.
+ */
+function wp_get_ability( string $name ): ?WP_Ability {
+	$registry = WP_Abilities_Registry::get_instance();
+	if ( null === $registry ) {
+ return null;
+	}
+
+	return $registry->get_registered( $name );
+}
+
+/**
+ * Retrieves all registered abilities using Abilities API.
+ *
+ * @since 6.9.0
+ *
+ * @see WP_Abilities_Registry::get_all_registered()
+ *
+ * @return WP_Ability[] The array of registered abilities.
+ */
+function wp_get_abilities(): array {
+	$registry = WP_Abilities_Registry::get_instance();
+	if ( null === $registry ) {
+ return array();
+	}
+
+	return $registry->get_all_registered();
+}
+
+/**
+ * Registers a new ability category.
+ *
+ * @since 6.9.0
+ *
+ * @see WP_Ability_Categories_Registry::register()
+ *
+ * @param string $slug The unique slug for the ability category. Must contain only lowercase
+ * alphanumeric characters and dashes.
+ * @param array<string, mixed> $args {
+ * An associative array of arguments for the ability category.
+ *
+ * @type string $label The human-readable label for the ability category.
+ * @type string $description A description of the ability category.
+ * @type array<string, mixed> $meta Optional. Additional metadata for the ability category.
+ * }
+ * @return WP_Ability_Category|null The registered ability category instance on success, null on failure.
+ */
+function wp_register_ability_category( string $slug, array $args ): ?WP_Ability_Category {
+	if ( ! did_action( 'wp_abilities_api_categories_init' ) ) {
+ _doing_it_wrong(
+ __METHOD__,
+ sprintf(
+ /* translators: 1: abilities_api_categories_init, 2: ability category slug. */
+ __( 'Ability categories must be registered on the %1$s action. The ability category %2$s was not registered.' ),
+ '<code>wp_abilities_api_categories_init</code>',
+ '<code>' . esc_html( $slug ) . '</code>'
+ ),
+ '6.9.0'
+ );
+ return null;
+	}
+
+	$registry = WP_Ability_Categories_Registry::get_instance();
+	if ( null === $registry ) {
+ return null;
+	}
+
+	return $registry->register( $slug, $args );
+}
+
+/**
+ * Unregisters an ability category.
+ *
+ * @since 6.9.0
+ *
+ * @see WP_Ability_Categories_Registry::unregister()
+ *
+ * @param string $slug The slug of the registered ability category.
+ * @return WP_Ability_Category|null The unregistered ability category instance on success, null on failure.
+ */
+function wp_unregister_ability_category( string $slug ): ?WP_Ability_Category {
+	$registry = WP_Ability_Categories_Registry::get_instance();
+	if ( null === $registry ) {
+ return null;
+	}
+
+	return $registry->unregister( $slug );
+}
+
+/**
+ * Checks if an ability category is registered.
+ *
+ * @since 6.9.0
+ *
+ * @see WP_Ability_Categories_Registry::is_registered()
+ *
+ * @param string $slug The slug of the ability category.
+ * @return bool True if the ability category is registered, false otherwise.
+ */
+function wp_has_ability_category( string $slug ): bool {
+	$registry = WP_Ability_Categories_Registry::get_instance();
+	if ( null === $registry ) {
+ return false;
+	}
+
+	return $registry->is_registered( $slug );
+}
+
+/**
+ * Retrieves a registered ability category.
+ *
+ * @since 6.9.0
+ *
+ * @see WP_Ability_Categories_Registry::get_registered()
+ *
+ * @param string $slug The slug of the registered ability category.
+ * @return WP_Ability_Category|null The registered ability category instance, or null if it is not registered.
+ */
+function wp_get_ability_category( string $slug ): ?WP_Ability_Category {
+	$registry = WP_Ability_Categories_Registry::get_instance();
+	if ( null === $registry ) {
+ return null;
+	}
+
+	return $registry->get_registered( $slug );
+}
+
+/**
+ * Retrieves all registered ability categories.
+ *
+ * @since 6.9.0
+ *
+ * @see WP_Ability_Categories_Registry::get_all_registered()
+ *
+ * @return WP_Ability_Category[] The array of registered ability categories.
+ */
+function wp_get_ability_categories(): array {
+	$registry = WP_Ability_Categories_Registry::get_instance();
+	if ( null === $registry ) {
+ return array();
+	}
+
+	return $registry->get_all_registered();
+}
diff --git a/src/wp-includes/abilities-api.php b/src/wp-includes/abilities-api.php
@@ -0,0 +1,260 @@
+<?php
+/**
+ * Abilities API
+ *
+ * Defines functions for managing abilities in WordPress.
+ *
+ * @package WordPress
+ * @subpackage Abilities_API
+ * @since 6.9.0
+ */
+
+declare( strict_types = 1 );
+
+/**
+ * Registers a new ability using Abilities API.
+ *
+ * Note: Should only be used on the {@see 'wp_abilities_api_init'} hook.
+ *
+ * @since 6.9.0
+ *
+ * @see WP_Abilities_Registry::register()
+ *
+ * @param string $name The name of the ability. The name must be a string containing a namespace
+ * prefix, i.e. `my-plugin/my-ability`. It can only contain lowercase
+ * alphanumeric characters, dashes and the forward slash.
+ * @param array<string, mixed> $args {
+ * An associative array of arguments for the ability.
+ *
+ * @type string $label The human-readable label for the ability.
+ * @type string $description A detailed description of what the ability does.
+ * @type string $category The ability category slug this ability belongs to.
+ * @type callable $execute_callback A callback function to execute when the ability is invoked.
+ * Receives optional mixed input and returns mixed result or WP_Error.
+ * @type callable $permission_callback A callback function to check permissions before execution.
+ * Receives optional mixed input and returns bool or WP_Error.
+ * @type array<string, mixed> $input_schema Optional. JSON Schema definition for the ability's input.
+ * @type array<string, mixed> $output_schema Optional. JSON Schema definition for the ability's output.
+ * @type array<string, mixed> $meta {
+ * Optional. Additional metadata for the ability.
+ *
+ * @type array<string, null|bool> $annotations Optional. Annotation metadata for the ability.
+ * @type bool $show_in_rest Optional. Whether to expose this ability in the REST API. Default false.
+ * }
+ * @type string $ability_class Optional. Custom class to instantiate instead of WP_Ability.
+ * }
+ * @return WP_Ability|null An instance of registered ability on success, null on failure.
+ */
+function wp_register_ability( string $name, array $args ): ?WP_Ability {
+	if ( ! did_action( 'wp_abilities_api_init' ) ) {
+ _doing_it_wrong(
+ __FUNCTION__,
+ sprintf(
+ /* translators: 1: abilities_api_init, 2: string value of the ability name. */
+ esc_html__( 'Abilities must be registered on the %1$s action. The ability %2$s was not registered.' ),
+ '<code>abilities_api_init</code>',
+ '<code>' . esc_html( $name ) . '</code>'
+ ),
+ '6.9.0'
+ );
+ return null;
+	}
+
+	$registry = WP_Abilities_Registry::get_instance();
+	if ( null === $registry ) {
+ return null;
+	}
+
+	return $registry->register( $name, $args );
+}
+
+/**
+ * Unregisters an ability from the Abilities API.
+ *
+ * @since 6.9.0
+ *
+ * @see WP_Abilities_Registry::unregister()
+ *
+ * @param string $name The name of the registered ability, with its namespace.
+ * @return WP_Ability|null The unregistered ability instance on success, null on failure.
+ */
+function wp_unregister_ability( string $name ): ?WP_Ability {
+	$registry = WP_Abilities_Registry::get_instance();
+	if ( null === $registry ) {
+ return null;
+	}
+
+	return $registry->unregister( $name );
+}
+
+/**
+ * Checks if an ability is registered.
+ *
+ * @since 6.9.0
+ *
+ * @see WP_Abilities_Registry::is_registered()
+ *
+ * @param string $name The name of the registered ability, with its namespace.
+ * @return bool True if the ability is registered, false otherwise.
+ */
+function wp_has_ability( string $name ): bool {
+	$registry = WP_Abilities_Registry::get_instance();
+	if ( null === $registry ) {
+ return false;
+	}
+
+	return $registry->is_registered( $name );
+}
+
+/**
+ * Retrieves a registered ability using Abilities API.
+ *
+ * @since 6.9.0
+ *
+ * @see WP_Abilities_Registry::get_registered()
+ *
+ * @param string $name The name of the registered ability, with its namespace.
+ * @return WP_Ability|null The registered ability instance, or null if it is not registered.
+ */
+function wp_get_ability( string $name ): ?WP_Ability {
+	$registry = WP_Abilities_Registry::get_instance();
+	if ( null === $registry ) {
+ return null;
+	}
+
+	return $registry->get_registered( $name );
+}
+
+/**
+ * Retrieves all registered abilities using Abilities API.
+ *
+ * @since 6.9.0
+ *
+ * @see WP_Abilities_Registry::get_all_registered()
+ *
+ * @return WP_Ability[] The array of registered abilities.
+ */
+function wp_get_abilities(): array {
+	$registry = WP_Abilities_Registry::get_instance();
+	if ( null === $registry ) {
+ return array();
+	}
+
+	return $registry->get_all_registered();
+}
+
+/**
+ * Registers a new ability category.
+ *
+ * @since 6.9.0
+ *
+ * @see WP_Ability_Categories_Registry::register()
+ *
+ * @param string $slug The unique slug for the ability category. Must contain only lowercase
+ * alphanumeric characters and dashes.
+ * @param array<string, mixed> $args {
+ * An associative array of arguments for the ability category.
+ *
+ * @type string $label The human-readable label for the ability category.
+ * @type string $description A description of the ability category.
+ * @type array<string, mixed> $meta Optional. Additional metadata for the ability category.
+ * }
+ * @return WP_Ability_Category|null The registered ability category instance on success, null on failure.
+ */
+function wp_register_ability_category( string $slug, array $args ): ?WP_Ability_Category {
+	if ( ! did_action( 'wp_abilities_api_categories_init' ) ) {
+ _doing_it_wrong(
+ __METHOD__,
+ sprintf(
+ /* translators: 1: abilities_api_categories_init, 2: ability category slug. */
+ __( 'Ability categories must be registered on the %1$s action. The ability category %2$s was not registered.' ),
+ '<code>wp_abilities_api_categories_init</code>',
+ '<code>' . esc_html( $slug ) . '</code>'
+ ),
+ '6.9.0'
+ );
+ return null;
+	}
+
+	$registry = WP_Ability_Categories_Registry::get_instance();
+	if ( null === $registry ) {
+ return null;
+	}
+
+	return $registry->register( $slug, $args );
+}
+
+/**
+ * Unregisters an ability category.
+ *
+ * @since 6.9.0
+ *
+ * @see WP_Ability_Categories_Registry::unregister()
+ *
+ * @param string $slug The slug of the registered ability category.
+ * @return WP_Ability_Category|null The unregistered ability category instance on success, null on failure.
+ */
+function wp_unregister_ability_category( string $slug ): ?WP_Ability_Category {
+	$registry = WP_Ability_Categories_Registry::get_instance();
+	if ( null === $registry ) {
+ return null;
+	}
+
+	return $registry->unregister( $slug );
+}
+
+/**
+ * Checks if an ability category is registered.
+ *
+ * @since 6.9.0
+ *
+ * @see WP_Ability_Categories_Registry::is_registered()
+ *
+ * @param string $slug The slug of the ability category.
+ * @return bool True if the ability category is registered, false otherwise.
+ */
+function wp_has_ability_category( string $slug ): bool {
+	$registry = WP_Ability_Categories_Registry::get_instance();
+	if ( null === $registry ) {
+ return false;
+	}
+
+	return $registry->is_registered( $slug );
+}
+
+/**
+ * Retrieves a registered ability category.
+ *
+ * @since 6.9.0
+ *
+ * @see WP_Ability_Categories_Registry::get_registered()
+ *
+ * @param string $slug The slug of the registered ability category.
+ * @return WP_Ability_Category|null The registered ability category instance, or null if it is not registered.
+ */
+function wp_get_ability_category( string $slug ): ?WP_Ability_Category {
+	$registry = WP_Ability_Categories_Registry::get_instance();
+	if ( null === $registry ) {
+ return null;
+	}
+
+	return $registry->get_registered( $slug );
+}
+
+/**
+ * Retrieves all registered ability categories.
+ *
+ * @since 6.9.0
+ *
+ * @see WP_Ability_Categories_Registry::get_all_registered()
+ *
+ * @return WP_Ability_Category[] The array of registered ability categories.
+ */
+function wp_get_ability_categories(): array {
+	$registry = WP_Ability_Categories_Registry::get_instance();
+	if ( null === $registry ) {
+ return array();
+	}
+
+	return $registry->get_all_registered();
+}
diff --git a/src/wp-includes/abilities-api.php b/src/wp-includes/abilities-api.php
@@ -0,0 +1,260 @@
+<?php
+/**
+ * Abilities API
+ *
+ * Defines functions for managing abilities in WordPress.
+ *
+ * @package WordPress
+ * @subpackage Abilities_API
+ * @since 6.9.0
+ */
+
+declare( strict_types = 1 );
+
+/**
+ * Registers a new ability using Abilities API.
+ *
+ * Note: Should only be used on the {@see 'wp_abilities_api_init'} hook.
+ *
+ * @since 6.9.0
+ *
+ * @see WP_Abilities_Registry::register()
+ *
+ * @param string $name The name of the ability. The name must be a string containing a namespace
+ * prefix, i.e. `my-plugin/my-ability`. It can only contain lowercase
+ * alphanumeric characters, dashes and the forward slash.
+ * @param array<string, mixed> $args {
+ * An associative array of arguments for the ability.
+ *
+ * @type string $label The human-readable label for the ability.
+ * @type string $description A detailed description of what the ability does.
+ * @type string $category The ability category slug this ability belongs to.
+ * @type callable $execute_callback A callback function to execute when the ability is invoked.
+ * Receives optional mixed input and returns mixed result or WP_Error.
+ * @type callable $permission_callback A callback function to check permissions before execution.
+ * Receives optional mixed input and returns bool or WP_Error.
+ * @type array<string, mixed> $input_schema Optional. JSON Schema definition for the ability's input.
+ * @type array<string, mixed> $output_schema Optional. JSON Schema definition for the ability's output.
+ * @type array<string, mixed> $meta {
+ * Optional. Additional metadata for the ability.
+ *
+ * @type array<string, null|bool> $annotations Optional. Annotation metadata for the ability.
+ * @type bool $show_in_rest Optional. Whether to expose this ability in the REST API. Default false.
+ * }
+ * @type string $ability_class Optional. Custom class to instantiate instead of WP_Ability.
+ * }
+ * @return WP_Ability|null An instance of registered ability on success, null on failure.
+ */
+function wp_register_ability( string $name, array $args ): ?WP_Ability {
+	if ( ! did_action( 'wp_abilities_api_init' ) ) {
+ _doing_it_wrong(
+ __FUNCTION__,
+ sprintf(
+ /* translators: 1: abilities_api_init, 2: string value of the ability name. */
+ esc_html__( 'Abilities must be registered on the %1$s action. The ability %2$s was not registered.' ),
+ '<code>abilities_api_init</code>',
+ '<code>' . esc_html( $name ) . '</code>'
+ ),
+ '6.9.0'
+ );
+ return null;
+	}
+
+	$registry = WP_Abilities_Registry::get_instance();
+	if ( null === $registry ) {
+ return null;
+	}
+
+	return $registry->register( $name, $args );
+}
+
+/**
+ * Unregisters an ability from the Abilities API.
+ *
+ * @since 6.9.0
+ *
+ * @see WP_Abilities_Registry::unregister()
+ *
+ * @param string $name The name of the registered ability, with its namespace.
+ * @return WP_Ability|null The unregistered ability instance on success, null on failure.
+ */
+function wp_unregister_ability( string $name ): ?WP_Ability {
+	$registry = WP_Abilities_Registry::get_instance();
+	if ( null === $registry ) {
+ return null;
+	}
+
+	return $registry->unregister( $name );
+}
+
+/**
+ * Checks if an ability is registered.
+ *
+ * @since 6.9.0
+ *
+ * @see WP_Abilities_Registry::is_registered()
+ *
+ * @param string $name The name of the registered ability, with its namespace.
+ * @return bool True if the ability is registered, false otherwise.
+ */
+function wp_has_ability( string $name ): bool {
+	$registry = WP_Abilities_Registry::get_instance();
+	if ( null === $registry ) {
+ return false;
+	}
+
+	return $registry->is_registered( $name );
+}
+
+/**
+ * Retrieves a registered ability using Abilities API.
+ *
+ * @since 6.9.0
+ *
+ * @see WP_Abilities_Registry::get_registered()
+ *
+ * @param string $name The name of the registered ability, with its namespace.
+ * @return WP_Ability|null The registered ability instance, or null if it is not registered.
+ */
+function wp_get_ability( string $name ): ?WP_Ability {
+	$registry = WP_Abilities_Registry::get_instance();
+	if ( null === $registry ) {
+ return null;
+	}
+
+	return $registry->get_registered( $name );
+}
+
+/**
+ * Retrieves all registered abilities using Abilities API.
+ *
+ * @since 6.9.0
+ *
+ * @see WP_Abilities_Registry::get_all_registered()
+ *
+ * @return WP_Ability[] The array of registered abilities.
+ */
+function wp_get_abilities(): array {
+	$registry = WP_Abilities_Registry::get_instance();
+	if ( null === $registry ) {
+ return array();
+	}
+
+	return $registry->get_all_registered();
+}
+
+/**
+ * Registers a new ability category.
+ *
+ * @since 6.9.0
+ *
+ * @see WP_Ability_Categories_Registry::register()
+ *
+ * @param string $slug The unique slug for the ability category. Must contain only lowercase
+ * alphanumeric characters and dashes.
+ * @param array<string, mixed> $args {
+ * An associative array of arguments for the ability category.
+ *
+ * @type string $label The human-readable label for the ability category.
+ * @type string $description A description of the ability category.
+ * @type array<string, mixed> $meta Optional. Additional metadata for the ability category.
+ * }
+ * @return WP_Ability_Category|null The registered ability category instance on success, null on failure.
+ */
+function wp_register_ability_category( string $slug, array $args ): ?WP_Ability_Category {
+	if ( ! did_action( 'wp_abilities_api_categories_init' ) ) {
+ _doing_it_wrong(
+ __METHOD__,
+ sprintf(
+ /* translators: 1: abilities_api_categories_init, 2: ability category slug. */
+ __( 'Ability categories must be registered on the %1$s action. The ability category %2$s was not registered.' ),
+ '<code>wp_abilities_api_categories_init</code>',
+ '<code>' . esc_html( $slug ) . '</code>'
+ ),
+ '6.9.0'
+ );
+ return null;
+	}
+
+	$registry = WP_Ability_Categories_Registry::get_instance();
+	if ( null === $registry ) {
+ return null;
+	}
+
+	return $registry->register( $slug, $args );
+}
+
+/**
+ * Unregisters an ability category.
+ *
+ * @since 6.9.0
+ *
+ * @see WP_Ability_Categories_Registry::unregister()
+ *
+ * @param string $slug The slug of the registered ability category.
+ * @return WP_Ability_Category|null The unregistered ability category instance on success, null on failure.
+ */
+function wp_unregister_ability_category( string $slug ): ?WP_Ability_Category {
+	$registry = WP_Ability_Categories_Registry::get_instance();
+	if ( null === $registry ) {
+ return null;
+	}
+
+	return $registry->unregister( $slug );
+}
+
+/**
+ * Checks if an ability category is registered.
+ *
+ * @since 6.9.0
+ *
+ * @see WP_Ability_Categories_Registry::is_registered()
+ *
+ * @param string $slug The slug of the ability category.
+ * @return bool True if the ability category is registered, false otherwise.
+ */
+function wp_has_ability_category( string $slug ): bool {
+	$registry = WP_Ability_Categories_Registry::get_instance();
+	if ( null === $registry ) {
+ return false;
+	}
+
+	return $registry->is_registered( $slug );
+}
+
+/**
+ * Retrieves a registered ability category.
+ *
+ * @since 6.9.0
+ *
+ * @see WP_Ability_Categories_Registry::get_registered()
+ *
+ * @param string $slug The slug of the registered ability category.
+ * @return WP_Ability_Category|null The registered ability category instance, or null if it is not registered.
+ */
+function wp_get_ability_category( string $slug ): ?WP_Ability_Category {
+	$registry = WP_Ability_Categories_Registry::get_instance();
+	if ( null === $registry ) {
+ return null;
+	}
+
+	return $registry->get_registered( $slug );
+}
+
+/**
+ * Retrieves all registered ability categories.
+ *
+ * @since 6.9.0
+ *
+ * @see WP_Ability_Categories_Registry::get_all_registered()
+ *
+ * @return WP_Ability_Category[] The array of registered ability categories.
+ */
+function wp_get_ability_categories(): array {
+	$registry = WP_Ability_Categories_Registry::get_instance();
+	if ( null === $registry ) {
+ return array();
+	}
+
+	return $registry->get_all_registered();
+}