version: str


class ServerVariable(BaseModelWithConfig):
    enum: Annotated[Optional[list[str]], Field(min_length=1)] = None
    default: str
    description: Optional[str] = None


class Server(BaseModelWithConfig):
    url: Union[AnyUrl, str]
    description: Optional[str] = None
    variables: Optional[dict[str, ServerVariable]] = None


class Reference(BaseModel):