For some reason on a second message,

         if not content_s3_keys:
             raise ValueError("s3_keys_to_summarize is empty")
 
         temp_file_dir = "/tmp/llama-indexer/s3-files"
 
         # TODO extension
         # TODO async
         file_paths = [
             download_file_from_s3(
                 bucket_name="usable-dev",
                 key=key,
                 target_dir=temp_file_dir,
                 extension="",
             )
             for key in content_s3_keys
         ]
 
         reader = SimpleDirectoryReader(input_files=file_paths)
         documents = reader.load_data()
 
         service_context = get_service_context(model=model)
 
         summary_index = SummaryIndex.from_documents(
             documents, service_context=service_context
         )
 
         agent_or_engine = CondensePlusContextChatEngine.from_defaults(
             retriever=summary_index.as_retriever(),
             service_context=get_service_context(model=model),
             chat_history=history,
             memory=ChatMemoryBuffer.from_defaults(  # pyright: ignore
                 chat_history=history, token_limit=128000
             ),
         )