Update tool.py

tool.py

@@ -24,6 +24,7 @@ class SimpleTool(Tool):
                 "low fodmap"
             ],
             "default": "none",
+            "nullable": True,
             "description": "Select dietary restriction from the available options."
         },
         "laziness": {
@@ -34,7 +35,7 @@ class SimpleTool(Tool):
     }
     output_type = "string"
 
-    def forward(self, ingredients: str, diet: str = "none", laziness: Optional[int] = 5) -> str:
+    def forward(self, ingredients: str, diet: Optional[str] = "none", laziness: Optional[int] = 5) -> str:
         """
         Gets a recipe suggestion based on provided ingredients, dietary preference, 
         and your laziness level (1=active chef, 10=super lazy). After finding a recipe, it
@@ -55,7 +56,7 @@ class SimpleTool(Tool):
             "none", "vegetarian", "vegan", "gluten free", "ketogenic",
             "paleo", "pescetarian", "whole30", "halal", "low fodmap"
         }
-        if diet not in valid_diets:
+        if diet and diet not in valid_diets:
             return f"Invalid diet option. Please choose from: {', '.join(sorted(valid_diets))}"
             
         import os