diff --git a/src/langbot/pkg/api/application/__init__.py b/src/langbot/pkg/api/application/__init__.py
new file mode 100644
index 000000000..7334a2795
--- /dev/null
+++ b/src/langbot/pkg/api/application/__init__.py
@@ -0,0 +1,5 @@
+"""Versioned, workspace-scoped application APIs shared by protocol adapters."""
+
+from .api import APPLICATION_API_VERSION, ApplicationAPI, OperationSpec
+
+__all__ = ['APPLICATION_API_VERSION', 'ApplicationAPI', 'OperationSpec']