There is another alternative word that might be used. For example, you could say the group had come up with a "resolution". This would mean the group came to a peaceful answer to a problem. You could ask if they had you come up with a resolution, or if they had resolved the problem.

To ask someone in the group this question, you could ask, 'Do you agree with the conclusion?"

If it's something you all had different opinions on, and talked until you agreed on an answer, you can say 'we've reached an agreement.' If you're solving a problem you can say that 'we've come up with a solution.' When asking if these statements are correct, you would say: Have we reached an agreement? or Do we all agree (on this solution)? You can also say, 'Are we all agreed?' or 'Is everyone okay with this/that?' Those are pretty safe answers. I hope this helped. Sorry if this doesn't answer your question. This is what I understood from the question you were asking.