diff --git a/wp-includes/rest-api.php b/wp-includes/rest-api.php
index 83b724511a..cbad102bbe 100644
--- a/wp-includes/rest-api.php
+++ b/wp-includes/rest-api.php
@@ -2258,3 +2258,88 @@ function rest_get_queried_resource_route() {
 	 */
 	return apply_filters( 'rest_queried_resource_route', $route );
 }
+
+/**
+ * Retrieves an array of endpoint arguments from the item schema and endpoint method.
+ *
+ * @since 5.6.0
+ *
+ * @param array  $schema The full JSON schema for the endpoint.
+ * @param string $method Optional. HTTP method of the endpoint. The arguments for `CREATABLE` endpoints are
+ *                       checked for required values and may fall-back to a given default, this is not done
+ *                       on `EDITABLE` endpoints. Default WP_REST_Server::CREATABLE.
+ * @return array The endpoint arguments.
+ */
+function rest_get_endpoint_args_for_schema( $schema, $method = WP_REST_Server::CREATABLE ) {
+
+	$schema_properties       = ! empty( $schema['properties'] ) ? $schema['properties'] : array();
+	$endpoint_args           = array();
+	$valid_schema_properties = array(
+		'type',
+		'format',
+		'enum',
+		'items',
+		'properties',
+		'additionalProperties',
+		'minimum',
+		'maximum',
+		'exclusiveMinimum',
+		'exclusiveMaximum',
+		'minLength',
+		'maxLength',
+		'pattern',
+		'minItems',
+		'maxItems',
+		'uniqueItems',
+	);
+
+	foreach ( $schema_properties as $field_id => $params ) {
+
+		// Arguments specified as `readonly` are not allowed to be set.
+		if ( ! empty( $params['readonly'] ) ) {
+			continue;
+		}
+
+		$endpoint_args[ $field_id ] = array(
+			'validate_callback' => 'rest_validate_request_arg',
+			'sanitize_callback' => 'rest_sanitize_request_arg',
+		);
+
+		if ( isset( $params['description'] ) ) {
+			$endpoint_args[ $field_id ]['description'] = $params['description'];
+		}
+
+		if ( WP_REST_Server::CREATABLE === $method && isset( $params['default'] ) ) {
+			$endpoint_args[ $field_id ]['default'] = $params['default'];
+		}
+
+		if ( WP_REST_Server::CREATABLE === $method && ! empty( $params['required'] ) ) {
+			$endpoint_args[ $field_id ]['required'] = true;
+		}
+
+		foreach ( $valid_schema_properties as $schema_prop ) {
+			if ( isset( $params[ $schema_prop ] ) ) {
+				$endpoint_args[ $field_id ][ $schema_prop ] = $params[ $schema_prop ];
+			}
+		}
+
+		// Merge in any options provided by the schema property.
+		if ( isset( $params['arg_options'] ) ) {
+
+			// Only use required / default from arg_options on CREATABLE endpoints.
+			if ( WP_REST_Server::CREATABLE !== $method ) {
+				$params['arg_options'] = array_diff_key(
+					$params['arg_options'],
+					array(
+						'required' => '',
+						'default'  => '',
+					)
+				);
+			}
+
+			$endpoint_args[ $field_id ] = array_merge( $endpoint_args[ $field_id ], $params['arg_options'] );
+		}
+	}
+
+	return $endpoint_args;
+}
diff --git a/wp-includes/rest-api/endpoints/class-wp-rest-controller.php b/wp-includes/rest-api/endpoints/class-wp-rest-controller.php
index 44880aaec2..d0d77d7ec1 100644
--- a/wp-includes/rest-api/endpoints/class-wp-rest-controller.php
+++ b/wp-includes/rest-api/endpoints/class-wp-rest-controller.php
@@ -625,78 +625,7 @@ abstract class WP_REST_Controller {
 	 * @return array Endpoint arguments.
 	 */
 	public function get_endpoint_args_for_item_schema( $method = WP_REST_Server::CREATABLE ) {
-
-		$schema                  = $this->get_item_schema();
-		$schema_properties       = ! empty( $schema['properties'] ) ? $schema['properties'] : array();
-		$endpoint_args           = array();
-		$valid_schema_properties = array(
-			'type',
-			'format',
-			'enum',
-			'items',
-			'properties',
-			'additionalProperties',
-			'minimum',
-			'maximum',
-			'exclusiveMinimum',
-			'exclusiveMaximum',
-			'minLength',
-			'maxLength',
-			'pattern',
-			'minItems',
-			'maxItems',
-			'uniqueItems',
-		);
-
-		foreach ( $schema_properties as $field_id => $params ) {
-
-			// Arguments specified as `readonly` are not allowed to be set.
-			if ( ! empty( $params['readonly'] ) ) {
-				continue;
-			}
-
-			$endpoint_args[ $field_id ] = array(
-				'validate_callback' => 'rest_validate_request_arg',
-				'sanitize_callback' => 'rest_sanitize_request_arg',
-			);
-
-			if ( isset( $params['description'] ) ) {
-				$endpoint_args[ $field_id ]['description'] = $params['description'];
-			}
-
-			if ( WP_REST_Server::CREATABLE === $method && isset( $params['default'] ) ) {
-				$endpoint_args[ $field_id ]['default'] = $params['default'];
-			}
-
-			if ( WP_REST_Server::CREATABLE === $method && ! empty( $params['required'] ) ) {
-				$endpoint_args[ $field_id ]['required'] = true;
-			}
-
-			foreach ( $valid_schema_properties as $schema_prop ) {
-				if ( isset( $params[ $schema_prop ] ) ) {
-					$endpoint_args[ $field_id ][ $schema_prop ] = $params[ $schema_prop ];
-				}
-			}
-
-			// Merge in any options provided by the schema property.
-			if ( isset( $params['arg_options'] ) ) {
-
-				// Only use required / default from arg_options on CREATABLE endpoints.
-				if ( WP_REST_Server::CREATABLE !== $method ) {
-					$params['arg_options'] = array_diff_key(
-						$params['arg_options'],
-						array(
-							'required' => '',
-							'default'  => '',
-						)
-					);
-				}
-
-				$endpoint_args[ $field_id ] = array_merge( $endpoint_args[ $field_id ], $params['arg_options'] );
-			}
-		}
-
-		return $endpoint_args;
+		return rest_get_endpoint_args_for_schema( $this->get_item_schema(), $method );
 	}
 
 	/**
diff --git a/wp-includes/version.php b/wp-includes/version.php
index a798d75e79..0fa8b8da86 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -13,7 +13,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.6-alpha-48950';
+$wp_version = '5.6-alpha-48951';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.