--- /dev/null
+/**
+ * Implements hook_menu_local_tasks_alter().
+ */
+function {{ machine_name }}_menu_local_tasks_alter(&$data, $route_name) {
+
+ // Add a tab linking to node/add to all pages.
+ $data['tabs'][0]['node.add_page'] = [
+ '#theme' => 'menu_local_task',
+ '#link' => [
+ 'title' => t('Example tab'),
+ 'url' => Url::fromRoute('node.add_page'),
+ 'localized_options' => [
+ 'attributes' => [
+ 'title' => t('Add content'),
+ ],
+ ],
+ ],
+ ];
+}