fix: enhance tool result handling for various content types

Author: liuruibin

apps/application/flow/tools.py

@@ -400,11 +400,23 @@ 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]
                     try:
-                        tool_result = json.loads(chunk[0].content)
-                        tool_lib_id = tool_result.pop('tool_id') if 'tool_id' in tool_result else None
+                        if isinstance(chunk[0].content, str):
+                            tool_result = json.loads(chunk[0].content)
+                        elif isinstance(chunk[0].content, dict):
+                            tool_result = chunk[0].content
+                        elif isinstance(chunk[0].content, list):
+                            tool_result = chunk[0].content[0] if len(chunk[0].content) > 0 else {}
+                        else:
+                            tool_result = {}
+                        text = tool_result.pop('text') if 'text' in tool_result else None
+                        text_result = json.loads(text)
+                        if text:
+                            tool_lib_id = text_result.pop('tool_id') if 'tool_id' in text_result else None
+                        else:
+                            tool_lib_id = tool_result.pop('tool_id') if 'tool_id' in tool_result else None
                         if tool_lib_id:
                             await save_tool_record(tool_lib_id, tool_info, tool_result, source_id, source_type)
-                        tool_result = json.dumps(tool_result, ensure_ascii=False)
+                        tool_result = json.dumps(text_result, ensure_ascii=False)
                     except Exception as e:
                         tool_result = chunk[0].content
                     content = generate_tool_message_complete(