[rules-dev] Why are fundamental API functions not part of "stable"?

Trying to provide some debugging functions, I find that org.drools.runtime.rule.WorkingMemory (a "stable" interface) lets you retrieve org.drools.runtime.rule.Agenda (another "stable" interface). But this one does not provide access to the current set of Activation objects. In contrast to this, org.drools.Agenda, which is part of the "unstable" Core API, does provide Activation[] getActivations(). Since there is org.drools.runtime.rule.Activation in the "stable" part, why is it not possible to retrieve the current activations by just using the "stable" API? I would think that concepts such as "agenda" and its current set of activations are here to stay. What should one do when one wants to implement support functions for Drools applications that should have long term stability?? Best Wolfgang