I like the approach of using an event (I think I have heard consensus that the group i happy with this change).
What we need to maintain though is the requirement that the event handler is executed in a "sandbox" of some sort that prevents the data passed in being stored or sent over the network.
As @ianbjacobs points out, this is partly based on privacy concerns, but also because this needs to return quickly as it likely impacting UI (the set of apps being presented to the user)
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