adding a final answer tool

tools.py

@@ -42,4 +42,16 @@ class VisitWebpageTool(Tool):
             return f"An unexpected error occurred: {str(e)}"
 
     def __init__(self, *args, **kwargs):
-        self.is_initialized = False
+        self.is_initialized = False
+
+class FinalAnswerTool(Tool):
+    name = "final_answer"
+    description = "Provides a final answer to the given problem."
+    inputs = {'answer': {'type': 'any', 'description': 'The final answer to the problem'}}
+    output_type = "any"
+
+    def forward(self, answer: Any) -> Any:
+        return answer
+
+    def __init__(self, *args, **kwargs):
+        self.is_initialized = False