fix country info inputs

tools/country_info_tool.py

@@ -13,7 +13,7 @@ class CountryInfoTool(Tool):
     description = "Retrieves important contextual information about a country in real-time: security, current events, national holidays, political climate, travel advice."
     inputs = {
         'country': {'type': 'string', 'description': 'Country name in French or English (e.g., "France", "United States", "Japan")'},
-        'info_type': {'type': 'string', 'description': 'Type of information requested: "all", "security", "events", "holidays", "travel", "politics"', 'nullable': True}
+        'info_type': {'type': 'string', 'description': 'Type of information requested: "all", "security", "events", "holidays", "travel", "politics"'}
     }
     output_type = "string"