diff --git a/libs/langchain_v1/langchain/agents/factory.py b/libs/langchain_v1/langchain/agents/factory.py
index b66d650f3fd..a245a4d4bef 100644
--- a/libs/langchain_v1/langchain/agents/factory.py
+++ b/libs/langchain_v1/langchain/agents/factory.py
@@ -867,11 +867,8 @@ def create_agent(
     initial_response_format: ToolStrategy[Any] | ProviderStrategy[Any] | AutoStrategy[Any] | None
     if response_format is None:
         initial_response_format = None
-    elif isinstance(response_format, (ToolStrategy, ProviderStrategy)):
-        # Preserve explicitly requested strategies
-        initial_response_format = response_format
-    elif isinstance(response_format, AutoStrategy):
-        # AutoStrategy provided - preserve it for later auto-detection
+    elif isinstance(response_format, (ToolStrategy, ProviderStrategy, AutoStrategy)):
+        # Explicit Tool/Provider strategy, or AutoStrategy for later capability detection
         initial_response_format = response_format
     else:
         # Raw schema - wrap in AutoStrategy to enable auto-detection