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Re:Ask HN: Are you migrating from Signal to another messenge... by Zash on Friday April 09, 2021 @05:29PM (#26756429)
I know at least https://conversejs.org/ does some sort of @mentions, I guess other clients just need more encouragement!
Re:Ask HN: Are you migrating from Signal to another messenge... by approxim8ion on Saturday April 10, 2021 @02:16AM (#26759367)
From what I understand, some or all of these XEPs need to be implemented and supported for mentions.

https://xmpp.org/extensions/inbox/jid-mention.html

https://xmpp.org/extensions/xep-0372.html

https://xmpp.org/extensions/attic/xep-0452-0.2.1.html

Re:Ask HN: Are you migrating from Signal to another messenge... by MattJ100 on Saturday April 10, 2021 @02:55AM (#26759525)
Pretty much all XMPP software supports mentions by scanning incoming messages for... well, a mention of your name.

XEP-0372 (your second link) is a way for sending clients to more explicitly mark mentions in a message. Clients are gradually switching to this instead of the text scanning technique.

The first link you gave is to a proposal in the inbox (it wasn't accepted), and the third to a relatively new proposal that is mostly for servers to help them know when to send push notifications to offline users in a group.