Hi Schimon,
yes, in Monal I'm using dico info requests to detect if a jid is a MUC or 1:1 chat:
https://github.com/monal-im/Monal/blob/develop/Monal/Classes/xmpp.m#L4551[1]
You'll have to properly check for different errors, see the comments in the code.
-tmolitor
Am Sonntag, 10. August 2025, 08:45:44 CEST schrieb Schimon Jehudah:
  Good day.
 
 I have a question concerning to preferable practice in JID recognition.
 
 
 Preface
 -------
 
 I am working on an XMPP service (i.e. "bot") for both private and group
 chat. I utilize Slixmpp for that task.
 
 
 Slixmpp
 -------
 
 Slixmpp has a "reply" function which automatically classifies the task,
 due to information which is attached to IQ Stanza.
 
 
 Concern
 -------
 
 However, when the service actively sends schedule messages, it needs to
 classify the given JID to which it sends a message.
 
 
 Database
 --------
 
 I have recently decided to classify subscribers of the service inside a
 database, which also has fields of Private, MIX, and MUC.
 
 
 Disco
 -----
 
 I was wondering whether should query JID addresses using "disco" (i.e.
 XEP-0030: Service Discovery), or should I utilize the database?
 
 Utilizing "disco" is prone to errors (e.g. when server blocks another
 server - displaying "recepient-unavailable" - yet contacts can still
 communicate).
 
 
 Conclusion
 ----------
 
 Please advise.
 
 
 Kind regards,
 Schimon
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--------
[1] 
https://github.com/monal-im/Monal/blob/develop/Monal/Classes/xmpp.m#L4551