@dansup the standard way to discover capabilities will eventually be much needed.

But I'm interested in what comes before: the ease-of-development of entirely new application types that are not silo's afterwards, but rather building-blocks for a more task-oriented fedi.

Here thinking that AP vocab extensions represent the domain structure found by DDD and messages represent some of the events from the domain-driven design (event storming) as they travel the network. AP is wire protocol here.