Open to visits \(~1 week\) by anyone who a current resident agrees to be the contact point for or high\-status person / organization recommends\. Short term residents have video calls or other interviews to gauge their compatibility and goals\. Long\-term residents can veto people they expect to be significantly net\-negative\.
I would very much encourage the norm here to be, "If you feel the need to veto something, explicitly start a double-crux."
Any time a veto happens, this inherently means there is a disagreement that hasn't been resolved. The bottleneck for Double Crux (CX²) seems to be "explicitly identifying moments in-the-moment where it would be good to use CX²". Veto situations are an ideal moment.