Fix api_server

pqai_agent_server/api_server.py

@@ -1,6 +1,7 @@
 #! /usr/bin/env python
 # -*- coding: utf-8 -*-
 # vim:fenc=utf-8
+import json
 import time
 import logging
 import werkzeug.exceptions
@@ -403,8 +404,8 @@ def save_native_agent_configuration():
     execution_model = req_data.get('execution_model', None)
     system_prompt = req_data.get('system_prompt', None)
     task_prompt = req_data.get('task_prompt', None)
-    tools = req_data.get('tools', [])
-    sub_agents = req_data.get('sub_agents', [])
+    tools = json.dumps(req_data.get('tools', []))
+    sub_agents = json.dumps(req_data.get('sub_agents', []))
     extra_params = req_data.get('extra_params', {})
 
     if not name: