Update app.py

app.py

@@ -52,7 +52,7 @@ class WebhookPostTool(Tool):
             "description": "The message/body nto send to the webhook"
         }
     }
-    output_type = str  # Must be one of SmolAgents authorized types
+    output_type = "string"  # Must be one of SmolAgents authorized types
 
     def forward(self, webhook_url: str, payload: dict) -> str:
         try: