from abc import ABC, abstractmethod


class LLMClient(ABC):
    @abstractmethod
    async def chat(self, model: str, messages: list[dict]) -> str:
        """Send a text chat request and return the response content string."""

    @abstractmethod
    async def chat_vision(self, model: str, messages: list[dict]) -> str:
        """Send a multimodal (vision) chat request and return the response content string."""