Take a look at this thread and Luke’s answer in the second post.
My reading: In general, if you need something done, circle someone up up and he will make one test for you. If the enmity clause gets invoked or the fiction demands it, you may well have to make another test to convince or pay him or something.
In your example, you circle up an old pal who happens to be a healer; he would certainly be willing to help you for free. He may, however, then turn around to the other guardmice and go “That was on the house. Now, what may I do for you?”
If you circle up a goldsmith because you need an expensive gift for some weasel king, you probably won’t get it for free.