fix: update variable name for clarity in tool record saving

Author: liuruibin

apps/application/flow/tools.py

@@ -400,9 +400,9 @@ async def _yield_mcp_response(chat_model, message_list, mcp_servers, mcp_output_
                 if tool_id in tool_calls_info:
                     tool_info = tool_calls_info[tool_id]
                     tool_result = json.loads(chunk[0].content)
-                    tool_id = tool_result.pop('tool_id')
-                    if tool_id:
-                        await save_tool_record(tool_id, tool_info, tool_result, source_id, source_type)
+                    tool_lib_id = tool_result.get('tool_id')
+                    if tool_lib_id:
+                        await save_tool_record(tool_lib_id, tool_info, tool_result, source_id, source_type)
                     content = generate_tool_message_complete(
                         tool_info['name'],
                         tool_info['input'],