diff --git a/src/prompttrail/agent/template/core.py b/src/prompttrail/agent/template/core.py
index 8999075..8b67709 100644
--- a/src/prompttrail/agent/template/core.py
+++ b/src/prompttrail/agent/template/core.py
@@ -110,7 +110,6 @@ def _render(self, state: "State") -> Generator[Message, None, State]:
             message = StatefulMessage(
                 content=rendered_content, sender=self.role, template_id=self.template_id
             )
-            state.session_history.messages.append(message)  # type: ignore
             # after_transform
             for after_transform_hook in self.after_transform:
                 state = after_transform_hook.hook(state)