license: License | None = None
    version: str


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


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


class Reference(BaseModel):