feat: Add some details regarding the tool output

tools/visit_webpage.py

@@ -6,7 +6,7 @@ import smolagents
 
 class VisitWebpageTool(Tool):
     name = "visit_webpage"
-    description = "Visits a webpage at the given url and reads its content as a markdown string. Use this to browse webpages."
+    description = "Visits a webpage at the given url and reads its content as a markdown string. Use this to browse webpages. The output content is in markdown format."
     inputs = {'url': {'type': 'string', 'description': 'The url of the webpage to visit.'}}
     output_type = "string"