Tiny fix

Author: dandansamax

crab/agents/backend_models/claude_model.py

@@ -167,7 +167,7 @@ def call_api(self, request_messages: list[dict]) -> anthropic.types.Message:
         return response
 
     def generate_backend_output(
-        cls, response_message: anthropic.types.Message
+        self, response_message: anthropic.types.Message
     ) -> BackendOutput:
         message = ""
         action_list = []