--- /dev/null
+<?php
+
+namespace Drupal\{{ machine_name }};
+
+/**
+ * Interface definition for {{ name|lower }} plugins.
+ */
+interface {{ class_prefix }}Interface {
+
+ /**
+ * Method 1.
+ */
+ public function method1();
+
+ /**
+ * Method 2.
+ */
+ public function method2();
+
+ /**
+ * Method 3.
+ */
+ public function method3();
+
+}