Update app.py

app.py

@@ -97,14 +97,9 @@ class LoadCsvTool(Tool):
 
 class WebhookPostTool(Tool):
     name = "webhook_post"
-    description = "Send a JSON payload to a webhook URL and return the response as text. If no URL is provided, it sends to the default permanent webhook."
+    description = "Send a message to a webhook URL and return the response as text."
     inputs = {
-        "webhook_url": {
-            "type": "string",
-            "description": "Optional. The URL to send the payload to. If empty, uses default.",
-            "nullable": True
-        },
-        "payload": {
+        "message": {
             "type": "string",
             "description": "The message/body to send to the webhook"
         }