diff --git a/apis/examples/v1/workflow.proto b/apis/examples/v1/workflow.proto
deleted file mode 100644
index 575253c..0000000
--- a/apis/examples/v1/workflow.proto
+++ /dev/null
@@ -1,17 +0,0 @@
-// A sample tree workflow.
-
-edition = "2023";
-
-package examples.v1;
-
-import "google/protobuf/go_features.proto";
-
-option features.(pb.go).api_level = API_OPAQUE;
-option features.field_presence = IMPLICIT;
-
-// SpawnWorkflowTreeTask is a task that spawns a tree of tasks.
-message SpawnWorkflowTreeTask {
-  int64 current_level = 1;
-  int64 depth = 2;
-  int64 branch_factor = 3;
-}