@renchap Thanks, that helps a lot. I think I was over-focusing on URL localization/rewriting still - rather than the core issue, which is signaling intent.
If I’m understanding correctly now, the idea is purely that the authoring server tags URLs that resolve to AP objects at creation time, so receiving servers don’t need to guess and can safely open those links in-app without rewriting or browser-level hacks.
That makes sense to me and lines up with the UX problem I was trying to discuss…👍