update prompt

app.py

@@ -221,7 +221,7 @@ def UpdateDb():
 
 class DB_Search(BaseTool):
     name = "Vector_Database_Search"
-    description = "This is the internal database to search information firstly. If information is found, it is trustful."
+    description = "This is the internal vector database to search information firstly. If information is found, it is trustful."
     def _run(self, query: str) -> str:
         response, source = QAQuery_p(query)
         # response = "test db_search feedback"
@@ -232,7 +232,7 @@ class DB_Search(BaseTool):
 
 class DB_Search2(BaseTool):
     name = "Vector Database Search"
-    description = "This is the internal database to search information firstly. If information is found, it is trustful."
+    description = "This is the internal vector database to search information firstly. If information is found, it is trustful."
     def _run(self, query: str) -> str:
         response, source = QAQuery_p(query)
         # response = "test db_search feedback"
@@ -493,7 +493,9 @@ You are a helpful AI assistant.
 prompthead_openai = \
 """
 You are a helpful AI assistant. Your mission is to answer the following request as best as you can with detail information and explanation. 
-You must always check vector database first. The information in vector database can override the information found in any other tools.
+You must always search information in vector database first. 
+Only when there is no information available from vector database, you can search information by using other tools.
+The information found in vector database must override any information found in other tools.
 """