diff --git a/agents/agent1/src/python_agent_template/agents/agent1/validators/errors/empty_string_error.py b/agents/agent1/src/python_agent_template/agents/agent1/validators/errors/empty_string_error.py
index 3b582e5..51074dd 100644
--- a/agents/agent1/src/python_agent_template/agents/agent1/validators/errors/empty_string_error.py
+++ b/agents/agent1/src/python_agent_template/agents/agent1/validators/errors/empty_string_error.py
@@ -1,5 +1,7 @@
 """Exception raised for empty string values."""
 
+from __future__ import annotations
+
 
 class EmptyStringError(ValueError):
     """Raised when a string is empty after trimming whitespace."""