chore: add create_json_message api for tools (#5440)

api/core/tools/tool/tool.py

@@ -207,30 +207,7 @@ class Tool(BaseModel, ABC):
             result = [result]
 
         return result
-    
-    def _convert_tool_response_to_str(self, tool_response: list[ToolInvokeMessage]) -> str:
-        """
-        Handle tool response
-        """
-        result = ''
-        for response in tool_response:
-            if response.type == ToolInvokeMessage.MessageType.TEXT:
-                result += response.message
-            elif response.type == ToolInvokeMessage.MessageType.LINK:
-                result += f"result link: {response.message}. please tell user to check it. \n"
-            elif response.type == ToolInvokeMessage.MessageType.IMAGE_LINK or \
-                 response.type == ToolInvokeMessage.MessageType.IMAGE:
-                result += "image has been created and sent to user already, you do not need to create it, just tell the user to check it now. \n"
-            elif response.type == ToolInvokeMessage.MessageType.BLOB:
-                if len(response.message) > 114:
-                    result += str(response.message[:114]) + '...'
-                else:
-                    result += str(response.message)
-            else:
-                result += f"tool response: {response.message}. \n"
 
-        return result
-    
     def _transform_tool_parameters_type(self, tool_parameters: dict[str, Any]) -> dict[str, Any]:
         """
         Transform tool parameters type
@@ -355,3 +332,12 @@ class Tool(BaseModel, ABC):
             message=blob, meta=meta,
             save_as=save_as
         )
+
+    def create_json_message(self, object: dict) -> ToolInvokeMessage:
+        """
+            create a json message
+        """
+        return ToolInvokeMessage(
+            type=ToolInvokeMessage.MessageType.JSON,
+            message=object
+        )