Wikibase Client provides a query+description API module for looking up the description of the linked Wikidata item; this is used by various other extensions. It would be nice if UnlinkedWikibase provided this.
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I'm not sure I understand. Would this be an API for getting descriptions of the local wiki (i.e. UnlinkedWikibase would provide {{SHORTDESC:}} and a means to fetch it), or a way for modules on the local wiki to retrieve the short descriptions of e.g. Wikipedia pages that are linked to Wikidata?