diff --git a/codex-rs/core/src/tools/handlers/extension_tools.rs b/codex-rs/core/src/tools/handlers/extension_tools.rs
index e9b16e97d..d04a6c520 100644
--- a/codex-rs/core/src/tools/handlers/extension_tools.rs
+++ b/codex-rs/core/src/tools/handlers/extension_tools.rs
@@ -271,6 +271,11 @@ mod tests {
         session
             .record_conversation_items(&turn, std::slice::from_ref(&history_item))
             .await;
+        let raw_history_event = rx.recv().await.expect("history raw response item event");
+        let EventMsg::RawResponseItem(raw_history_item) = raw_history_event.msg else {
+            panic!("expected raw response item event");
+        };
+        assert_eq!(raw_history_item.item, history_item);
         let invocation = ToolInvocation {
             session,
             turn,