diff --git a/src/agents/extensions/handoff_filters.py b/src/agents/extensions/handoff_filters.py
index 4abe99a45..a4433ae0c 100644
--- a/src/agents/extensions/handoff_filters.py
+++ b/src/agents/extensions/handoff_filters.py
@@ -4,6 +4,7 @@
 from ..items import (
     HandoffCallItem,
     HandoffOutputItem,
+    ReasoningItem,
     RunItem,
     ToolCallItem,
     ToolCallOutputItem,
@@ -41,6 +42,7 @@ def _remove_tools_from_items(items: tuple[RunItem, ...]) -> tuple[RunItem, ...]:
             or isinstance(item, HandoffOutputItem)
             or isinstance(item, ToolCallItem)
             or isinstance(item, ToolCallOutputItem)
+            or isinstance(item, ReasoningItem)
         ):
             continue
         filtered_items.append(item)
diff --git a/tests/test_extension_filters.py b/tests/test_extension_filters.py
index 3c2ba9e4f..11fba51ba 100644
--- a/tests/test_extension_filters.py
+++ b/tests/test_extension_filters.py
@@ -1,10 +1,12 @@
 from openai.types.responses import ResponseOutputMessage, ResponseOutputText
+from openai.types.responses.response_reasoning_item import ResponseReasoningItem
 
 from agents import Agent, HandoffInputData, RunContextWrapper
 from agents.extensions.handoff_filters import remove_all_tools
 from agents.items import (
     HandoffOutputItem,
     MessageOutputItem,
+    ReasoningItem,
     ToolCallOutputItem,
     TResponseInputItem,
 )
@@ -23,6 +25,10 @@ def _get_message_input_item(content: str) -> TResponseInputItem:
     }
 
 
+def _get_reasoning_input_item() -> TResponseInputItem:
+    return {"id": "rid", "summary": [], "type": "reasoning"}
+
+
 def _get_function_result_input_item(content: str) -> TResponseInputItem:
     return {
         "call_id": "1",
@@ -77,6 +83,12 @@ def _get_handoff_output_run_item(content: str) -> HandoffOutputItem:
     )
 
 
+def _get_reasoning_output_run_item() -> ReasoningItem:
+    return ReasoningItem(
+        agent=fake_agent(), raw_item=ResponseReasoningItem(id="rid", summary=[], type="reasoning")
+    )
+
+
 def test_empty_data():
     handoff_input_data = HandoffInputData(
         input_history=(),
@@ -161,21 +173,24 @@ def test_removes_tools_from_new_items_and_history():
     handoff_input_data = HandoffInputData(
         input_history=(
             _get_message_input_item("Hello1"),
+            _get_reasoning_input_item(),
             _get_function_result_input_item("World"),
             _get_message_input_item("Hello2"),
         ),
         pre_handoff_items=(
+            _get_reasoning_output_run_item(),
             _get_message_output_run_item("123"),
             _get_tool_output_run_item("456"),
         ),
         new_items=(
+            _get_reasoning_output_run_item(),
             _get_message_output_run_item("Hello"),
             _get_tool_output_run_item("World"),
         ),
         run_context=RunContextWrapper(context=()),
     )
     filtered_data = remove_all_tools(handoff_input_data)
-    assert len(filtered_data.input_history) == 2
+    assert len(filtered_data.input_history) == 3
     assert len(filtered_data.pre_handoff_items) == 1
     assert len(filtered_data.new_items) == 1
 
@@ -187,11 +202,13 @@ def test_removes_handoffs_from_history():
             _get_handoff_input_item("World"),
         ),
         pre_handoff_items=(
+            _get_reasoning_output_run_item(),
             _get_message_output_run_item("Hello"),
             _get_tool_output_run_item("World"),
             _get_handoff_output_run_item("World"),
         ),
         new_items=(
+            _get_reasoning_output_run_item(),
             _get_message_output_run_item("Hello"),
             _get_tool_output_run_item("World"),
             _get_handoff_output_run_item("World"),