Fixed the primeira liga tool output.

app.py

@@ -45,7 +45,7 @@ def curiosity(input: str) -> str:
     return "Wow, amazing!"
 
 @tool
-def get_primeira_liga_team_stats(team_name: str) -> Optional[Dict[str, Any]]:
+def get_primeira_liga_team_stats(team_name: str) -> str:
     """
     Retrieve standing and last 3 match scores for a given Primeira Liga team using TheSportsDB API.
     
@@ -91,7 +91,7 @@ def get_primeira_liga_team_stats(team_name: str) -> Optional[Dict[str, Any]]:
         team_search_data = team_search_response.json()
         
         if not team_search_data.get('teams'):
-            return None
+            return "Error: Team not found"
         
         # Get the first matching team's ID
         team_id = team_search_data['teams'][0]['idTeam']
@@ -127,15 +127,15 @@ def get_primeira_liga_team_stats(team_name: str) -> Optional[Dict[str, Any]]:
             }
             last_3_matches.append(match)
         
-        return {
+        return str({
             "team": team_name,
             "standing": standing,
             "last_3_matches": last_3_matches
-        }
+        })
     
     except Exception as e:
         print(f"Error retrieving team stats: {e}")
-        return None
+        return str("Error retrieving team stats")