Hello all, Sam commented on https://gerrit.baserock.org/#/c/1213/ suggesting that any definitions updates should be suggested here, so here goes... Change 1213 is an RFC for a suggested tweak to the definitions format, it seems more natural to me that if the build-system key is required for chunk definitions that do not hold chunk morphs then the build-system key should also be required in the chunk morphs themselves. I've noted in change 1213 that my motivation for this change is that I am frequently tripped up by the tooling assuming that when I don't define a build-system key I really mean build-system: manual, when more often than not I'm trying to override some subset of a given build-system. I do not assume I know what is best for the format overall but this change seems small enough that I feel comfortable submitting it for your consideration. The RFC happens to come with an implementation that would update morph, I can fashion an equivalent patch for ybd if required. Thanks, Richard Ipsum