diff --git a/lang_agent/fs_bkends/__init__.py b/lang_agent/fs_bkends/__init__.py
new file mode 100644
index 0000000..988c2fd
--- /dev/null
+++ b/lang_agent/fs_bkends/__init__.py
@@ -0,0 +1,11 @@
+import tyro
+
+from lang_agent.fs_bkends.base import BaseFilesystemBackend
+from lang_agent.fs_bkends.statebk import StateBk, StateBkConfig
+
+statebk_dict = {
+    "statebk": StateBkConfig(),
+}
+
+statebk_union = tyro.extras.subcommand_type_from_defaults(statebk_dict, prefix_names=False)
+AnnotatedStateBk = tyro.conf.OmitSubcommandPrefixes[tyro.conf.SuppressFixed[statebk_union]]
\ No newline at end of file