diff --git a/include/action.h b/include/action.h
index e5506033..1a45fa92 100644
--- a/include/action.h
+++ b/include/action.h
@@ -5,6 +5,7 @@
 struct view;
 struct server;
 struct wl_list;
+struct wlr_box;
 
 struct action {
 	struct wl_list link;  /* struct keybinding.actions,
@@ -17,6 +18,7 @@ struct action {
 
 struct action *action_create(const char *action_name);
 void action_arg_add_str(struct action *action, char *key, const char *value);
+struct wlr_box *action_arg_add_box(struct action *action, char *name);
 void actions_run(struct view *activator, struct server *server,
 	struct wl_list *actions, uint32_t resize_edges);
 void action_list_free(struct wl_list *action_list);
diff --git a/include/private/action.h b/include/private/action.h
index 0b8f60d0..e58ee666 100644
--- a/include/private/action.h
+++ b/include/private/action.h
@@ -7,6 +7,7 @@
 
 enum action_arg_type {
 	LAB_ACTION_ARG_STR = 0,
+	LAB_ACTION_ARG_BOX,
 };
 
 struct action_arg {
@@ -21,4 +22,9 @@ struct action_arg_str {
 	char *value;
 };
 
+struct action_arg_box {
+	struct action_arg base;
+	struct wlr_box value;
+};
+
 #endif /* __LABWC_PRIVATE_ACTION_H */
diff --git a/src/action.c b/src/action.c
index 3b6dd4d4..15970df1 100644
--- a/src/action.c
+++ b/src/action.c
@@ -73,6 +73,13 @@ action_str_from_arg(struct action_arg *arg)
 	return ((struct action_arg_str *)arg)->value;
 }
 
+static struct wlr_box *
+action_box_from_arg(struct action_arg *arg)
+{
+	assert(arg->type == LAB_ACTION_ARG_BOX);
+	return &((struct action_arg_box *)arg)->value;
+}
+
 static struct action_arg *
 action_get_first_arg(struct action *action)
 {
@@ -357,3 +364,15 @@ action_arg_add_str(struct action *action, char *key, const char *value)
 	arg->value = strdup(value);
 	wl_list_insert(action->args.prev, &arg->base.link);
 }
+
+struct wlr_box *
+action_arg_add_box(struct action *action, char *name)
+{
+	struct action_arg_box *arg = calloc(1, sizeof(*arg));
+	arg->base.type = LAB_ACTION_ARG_BOX;
+	if (name) {
+		arg->base.key = strdup(name);
+	}
+	wl_list_insert(action->args.prev, &arg->base.link);
+	return &arg->value;
+}