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+<a id="path-spec.txt-2.3"></a>
+## Cannibalizing circuits
+
+If we need a circuit and have a clean one already established, in
+some cases we can adapt the clean circuit for our new
+purpose. Specifically,
+
+For hidden service interactions, we can "cannibalize" a clean internal
+circuit if one is available, so we don't need to build those circuits
+from scratch on demand.
+
+We can also cannibalize clean circuits when the client asks to exit
+at a given node -- either via the ".exit" notation or because the
+destination is running at the same location as an exit node.
+