class ProviderError(Exception):
    """Base provider exception."""


class ProviderTransientError(ProviderError):
    """Temporary provider failure that can be retried."""


class ProviderRateLimitError(ProviderTransientError):
    """Raised when provider rate limit is hit."""

    def __init__(self, message: str, retry_after_seconds: int = 30):
        super().__init__(message)
        self.retry_after_seconds = retry_after_seconds


class ProviderNotFoundError(ProviderError):
    """Raised when an unknown provider namespace is requested."""