Lazy initializing

class MCPClient:
    def __init__(self):
        # Initialize session and client objects
        self.session: ClientSession | None = None
        self.exit_stack = AsyncExitStack()
        self._anthropic: Anthropic | None = None

    @property
    def anthropic(self) -> Anthropic:
        """Lazy-initialize Anthropic client when needed"""
        if self._anthropic is None:
            self._anthropic = Anthropic(api_key=os.getenv("ANTHROPIC_API_KEY"))
        return self._anthropic