fix to ai_client.py

ai_client.py

@@ -955,13 +955,16 @@ def _send_anthropic(md_content: str, user_message: str, base_dir: str, file_item
                     ),
                 })
 
+            def _strip_private_keys(history):
+                return [{k: v for k, v in m.items() if not k.startswith("_")} for m in history]
+
             response = _anthropic_client.messages.create(
                 model=_model,
                 max_tokens=_max_tokens,
                 temperature=_temperature,
                 system=system_blocks,
                 tools=_get_anthropic_tools(),
-                messages=_anthropic_history,
+                messages=_strip_private_keys(_anthropic_history),
             )
 
             # Convert SDK content block objects to plain dicts before storing in history