@bunnyhero@octodon.social Here we go: https://github.com/tootsuite/mastodon/issues/2012 It's not a part of the OStatus standard, it's a Mastodon specific thing. Gargron hasn't commented, but it appears that the format isn't specifically documented right now - whatever the core Mastodon Rails app does is canonical, and its API presumably doesn't return sufficient metadata to make the same decisions.
@bunnyhero@octodon.social Since I noticed that Amoroq handles linkification separately - partly because it's not documented, partly because a Mastodon server has more information available to it to make these decisions than a client has. Why not feed that metadata to the client?