diff --git a/src/agents/extensions/handoff_filters.py b/src/agents/extensions/handoff_filters.py
index de44f1566a..14fd303f47 100644
--- a/src/agents/extensions/handoff_filters.py
+++ b/src/agents/extensions/handoff_filters.py
@@ -96,6 +96,8 @@ def _remove_tool_types_from_input(
         "shell_call_output",
         "apply_patch_call",
         "apply_patch_call_output",
+        "custom_tool_call",
+        "custom_tool_call_output",
     ]
 
     filtered_items: list[TResponseInputItem] = []
diff --git a/tests/test_extension_filters.py b/tests/test_extension_filters.py
index 97924d2852..257f3fed5e 100644
--- a/tests/test_extension_filters.py
+++ b/tests/test_extension_filters.py
@@ -1041,6 +1041,8 @@ def test_removes_hosted_tool_types_from_input_history() -> None:
         "shell_call_output",
         "apply_patch_call",
         "apply_patch_call_output",
+        "custom_tool_call",
+        "custom_tool_call_output",
     ]
     input_items: list[TResponseInputItem] = [_get_message_input_item("Hello")]
     for t in hosted_types: