@NEETzsche @lain i also want to add that "adding new scope" is a bit difficult, because scopes literally do not exist on AP level, it's a mastodonism that only really exists in MastoAPI, i.e. backend-to-frontend communication. In reality scope determines and is determined by whom post is addressed, i.e. what to/cc fields are. I really don't know details but I assume that whether post is public or unlisted is determined whether instance's global inbox is on cc list or not, or something along these lines.

I don't know if it's possible to add attributes/metadata to activities though, i sure fucking hope it's possible, but with API you never know. Last time it went something like this
(from discussion on adding detection if server supports chats)
>won't sever respond with 400 Bad Request if it receives an activity it doesn't understand?
<no, by standard it has to respond with 200 and just don't say anything