def METHOD_NAME(behaviour: AsyncHandlerMethod[Response]):
    @functools.wraps(behaviour)
    async def new_behaviour(
        request: Request, context: BentoServicerContext
    ) -> Response | t.Awaitable[Response]:
        context.set_trailing_metadata(aio.Metadata.from_tuple(self._metadata))
        return await behaviour(request, context)
    return new_behaviour