diff -r 7b1b88e27a20 -r 48c4eec2b7e6 wp/wp-includes/rest-api/endpoints/class-wp-rest-blocks-controller.php
--- a/wp/wp-includes/rest-api/endpoints/class-wp-rest-blocks-controller.php	Thu Sep 29 08:06:27 2022 +0200
+++ b/wp/wp-includes/rest-api/endpoints/class-wp-rest-blocks-controller.php	Fri Sep 05 18:40:08 2025 +0200
@@ -1,6 +1,6 @@
 <?php
 /**
- * Reusable blocks REST API: WP_REST_Blocks_Controller class
+ * Synced patterns REST API: WP_REST_Blocks_Controller class
  *
  * @package WordPress
  * @subpackage REST_API
@@ -9,8 +9,8 @@
 
 /**
  * Controller which provides a REST endpoint for the editor to read, create,
- * edit and delete reusable blocks. Blocks are stored as posts with the wp_block
- * post type.
+ * edit, and delete synced patterns (formerly called reusable blocks).
+ * Patterns are stored as posts with the wp_block post type.
  *
  * @since 5.0.0
  *
@@ -20,12 +20,12 @@
 class WP_REST_Blocks_Controller extends WP_REST_Posts_Controller {
 
 	/**
-	 * Checks if a block can be read.
+	 * Checks if a pattern can be read.
 	 *
 	 * @since 5.0.0
 	 *
 	 * @param WP_Post $post Post object that backs the block.
-	 * @return bool Whether the block can be read.
+	 * @return bool Whether the pattern can be read.
 	 */
 	public function check_read_permission( $post ) {
 		// By default the read_post capability is mapped to edit_posts.
@@ -40,6 +40,7 @@
 	 * Filters a response based on the context defined in the schema.
 	 *
 	 * @since 5.0.0
+	 * @since 6.3.0 Adds the `wp_pattern_sync_status` postmeta property to the top level of response.
 	 *
 	 * @param array  $data    Response data to filter.
 	 * @param string $context Context defined in the schema.
@@ -49,44 +50,51 @@
 		$data = parent::filter_response_by_context( $data, $context );
 
 		/*
-		 * Remove `title.rendered` and `content.rendered` from the response. It
-		 * doesn't make sense for a reusable block to have rendered content on its
-		 * own, since rendering a block requires it to be inside a post or a page.
+		 * Remove `title.rendered` and `content.rendered` from the response.
+		 * It doesn't make sense for a pattern to have rendered content on its own,
+		 * since rendering a block requires it to be inside a post or a page.
 		 */
 		unset( $data['title']['rendered'] );
 		unset( $data['content']['rendered'] );
 
+		// Add the core wp_pattern_sync_status meta as top level property to the response.
+		$data['wp_pattern_sync_status'] = isset( $data['meta']['wp_pattern_sync_status'] ) ? $data['meta']['wp_pattern_sync_status'] : '';
+		unset( $data['meta']['wp_pattern_sync_status'] );
 		return $data;
 	}
 
 	/**
-	 * Retrieves the block's schema, conforming to JSON Schema.
+	 * Retrieves the pattern's schema, conforming to JSON Schema.
 	 *
 	 * @since 5.0.0
 	 *
 	 * @return array Item schema data.
 	 */
 	public function get_item_schema() {
-		// Do not cache this schema because all properties are derived from parent controller.
+		if ( $this->schema ) {
+			return $this->add_additional_fields_schema( $this->schema );
+		}
+
 		$schema = parent::get_item_schema();
 
 		/*
-		 * Allow all contexts to access `title.raw` and `content.raw`. Clients always
-		 * need the raw markup of a reusable block to do anything useful, e.g. parse
-		 * it or display it in an editor.
+		 * Allow all contexts to access `title.raw` and `content.raw`.
+		 * Clients always need the raw markup of a pattern to do anything useful,
+		 * e.g. parse it or display it in an editor.
 		 */
 		$schema['properties']['title']['properties']['raw']['context']   = array( 'view', 'edit' );
 		$schema['properties']['content']['properties']['raw']['context'] = array( 'view', 'edit' );
 
 		/*
-		 * Remove `title.rendered` and `content.rendered` from the schema. It doesn’t
-		 * make sense for a reusable block to have rendered content on its own, since
-		 * rendering a block requires it to be inside a post or a page.
+		 * Remove `title.rendered` and `content.rendered` from the schema.
+		 * It doesn't make sense for a pattern to have rendered content on its own,
+		 * since rendering a block requires it to be inside a post or a page.
 		 */
 		unset( $schema['properties']['title']['properties']['rendered'] );
 		unset( $schema['properties']['content']['properties']['rendered'] );
 
-		return $schema;
+		$this->schema = $schema;
+
+		return $this->add_additional_fields_schema( $this->schema );
 	}
-
 }