fix: preserve chat kwargs identity when no sanitization is needed

run_agent.py

@@ -2737,6 +2737,27 @@ class AIAgent:
 
             return kwargs
 
+        sanitized_messages = api_messages
+        needs_sanitization = False
+        for msg in api_messages:
+            if not isinstance(msg, dict):
+                continue
+            if "codex_reasoning_items" in msg:
+                needs_sanitization = True
+                break
+
+            tool_calls = msg.get("tool_calls")
+            if isinstance(tool_calls, list):
+                for tool_call in tool_calls:
+                    if not isinstance(tool_call, dict):
+                        continue
+                    if "call_id" in tool_call or "response_item_id" in tool_call:
+                        needs_sanitization = True
+                        break
+                if needs_sanitization:
+                    break
+
+        if needs_sanitization:
             sanitized_messages = copy.deepcopy(api_messages)
             for msg in sanitized_messages:
                 if not isinstance(msg, dict):