Update app.py

app.py

@@ -48,13 +48,13 @@ class WebhookPostTool(Tool):
             "description": "The url to send the payload to"
         },
         "payload": {
-            "type": "dictionary",
+            "type": "string",
             "description": "The message/body nto send to the webhook"
         }
     }
     output_type = "string"  # Must be one of SmolAgents authorized types
 
-    def forward(self, webhook_url: str, payload: dict) -> str:
+    def forward(self, webhook_url: str, payload: str) -> str:
         try:
             response = requests.post(webhook_url, json=payload)
             return response.text