langchain/llms/manifest.py/ManifestWrapper/_call
class ManifestWrapper:    def _call(
        self,
        prompt: str,
        stop: Optional[List[str]] = None,
        run_manager: Optional[CallbackManagerForLLMRun] = None,
    ) -> str:
        """Call out to LLM through Manifest."""
        if stop is not None and len(stop) != 1:
            raise NotImplementedError(
                f"Manifest currently only supports a single stop token, got {stop}"
            )
        kwargs = self.llm_kwargs or {}
        if stop is not None:
            kwargs["stop_token"] = stop
        return self.client.run(prompt, **kwargs)