diff --git a/wp-includes/rest-api/endpoints/class-wp-rest-blocks-controller.php b/wp-includes/rest-api/endpoints/class-wp-rest-blocks-controller.php
index 66a2e7adad..a523764dc5 100644
--- a/wp-includes/rest-api/endpoints/class-wp-rest-blocks-controller.php
+++ b/wp-includes/rest-api/endpoints/class-wp-rest-blocks-controller.php
@@ -36,4 +36,57 @@ class WP_REST_Blocks_Controller extends WP_REST_Posts_Controller {
 
 		return parent::check_read_permission( $post );
 	}
+
+	/**
+	 * Filters a response based on the context defined in the schema.
+	 *
+	 * @since 5.0.0
+	 *
+	 * @param array  $data    Response data to fiter.
+	 * @param string $context Context defined in the schema.
+	 * @return array Filtered response.
+	 */
+	public function filter_response_by_context( $data, $context ) {
+		$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.
+		 */
+		unset( $data['title']['rendered'] );
+		unset( $data['content']['rendered'] );
+
+		return $data;
+	}
+
+	/**
+	 * Retrieves the block's schema, conforming to JSON Schema.
+	 *
+	 * @since 5.0.0
+	 *
+	 * @return array Item schema data.
+	 */
+	public function get_item_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.
+		 */
+		$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.
+		 */
+		unset( $schema['properties']['title']['properties']['rendered'] );
+		unset( $schema['properties']['content']['properties']['rendered'] );
+
+		return $schema;
+	}
+
 }
diff --git a/wp-includes/version.php b/wp-includes/version.php
index 553b78415d..8ee222666c 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -13,7 +13,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.1-alpha-44267';
+$wp_version = '5.1-alpha-44268';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.