diff --git a/src/durable_workflow/worker.py b/src/durable_workflow/worker.py
index 577d89e..1eacfb5 100644
--- a/src/durable_workflow/worker.py
+++ b/src/durable_workflow/worker.py
@@ -137,6 +137,7 @@
     TYPED_SEARCH_ATTRIBUTES_CAPABILITY,
     DURABLE_SELECTION_CAPABILITY,
     LOCAL_ACTIVITIES_CAPABILITY,
+    "workflow_entry_arguments_validation",
 )
 
 _WORKFLOW_WORK_TASK_KINDS = ("workflow", "update_validation")
diff --git a/tests/test_worker.py b/tests/test_worker.py
index eda7573..daf6bd9 100644
--- a/tests/test_worker.py
+++ b/tests/test_worker.py
@@ -430,6 +430,7 @@ async def test_register(self, mock_client: AsyncMock) -> None:
                 "typed_search_attributes",
                 DURABLE_SELECTION_CAPABILITY,
                 "local_activities",
+                "workflow_entry_arguments_validation",
                 "query_tasks",
                 MESSAGE_STREAMS_CAPABILITY,
                 "worker_sessions",
@@ -577,6 +578,7 @@ def run(self, ctx):  # type: ignore[no-untyped-def]
             TYPED_SEARCH_ATTRIBUTES_CAPABILITY,
             DURABLE_SELECTION_CAPABILITY,
             "local_activities",
+            "workflow_entry_arguments_validation",
             "query_tasks",
             WORKFLOW_UPDATES_CAPABILITY,
             MESSAGE_STREAMS_CAPABILITY,
@@ -664,6 +666,7 @@ def run(self, ctx):  # type: ignore[no-untyped-def]
             TYPED_SEARCH_ATTRIBUTES_CAPABILITY,
             DURABLE_SELECTION_CAPABILITY,
             "local_activities",
+            "workflow_entry_arguments_validation",
             "query_tasks",
             UPDATE_VALIDATION_TASKS_CAPABILITY,
             WORKFLOW_UPDATES_CAPABILITY,
@@ -774,6 +777,7 @@ async def test_register_keeps_baseline_capabilities_when_server_does_not_support
             TYPED_SEARCH_ATTRIBUTES_CAPABILITY,
             DURABLE_SELECTION_CAPABILITY,
             "local_activities",
+            "workflow_entry_arguments_validation",
             MESSAGE_STREAMS_CAPABILITY,
             "worker_sessions",
         ]