I assume (!) it was great, and you are either desperately waiting for the third agreement or you have already bought the book (congratulations in that case).
Here we go:
The third agreement is: “Don’t make assumptions.”
“We make assumptions about what others are doing or thinking – we take it personally – then we blame them and react by sending emotional poison with our word.”
And “we are afraid to ask for clarification. (…) It is always better to ask questions than to make an assumption, because assumptions set us up for suffering.”
When I read this, I was immediately reminded of an encounter a few years back. I felt annoyed first, then emberrassed, and today I find it amusing: