fix: assigning extra tool calls used fixed in validators

Author: jmatejcz

src/rai_bench/rai_bench/tool_calling_agent/validators.py

@@ -132,13 +132,13 @@ def validate(self, tool_calls: List[ToolCall]) -> Tuple[bool, List[ToolCall]]:
             # all tool calls iterated
             # all subtask completed
             self.passed = True
-            self.extra_calls_used += len(tool_calls) - self.required_calls
+            self.extra_calls_used = len(tool_calls) - self.required_calls
             return True, []
 
         self.logger.error(
             f"Validation failed for tasks: {[idx + 1 for idx in to_be_done_idx]}"
         )
         self.passed = False
         if len(tool_calls) > self.required_calls:
-            self.extra_calls_used += len(tool_calls) - self.required_calls
+            self.extra_calls_used = len(tool_calls) - self.required_calls
         return False, []