Update app.py

app.py

@@ -27,7 +27,7 @@ class VisitWebpageTool(Tool):
     description = "Visits a webpage at the given url and returns its content as a markdown string."
     inputs = {
         "url": {
-            "type": "text",
+            "type": "string",
             "description": "The url of the webpage to visit.",
         }
     }