And come to think of it, you could do this even without giving the tool access to your email, if you just set up an automated forwarder to forward any amazon emails to it, and then it could reply with the details. (Would still need amazon access though.)
Is anyone aware of such a tool, or interested in creating it?
Some other theories about this were discussed on Hacker News[1], such as forcing you to log back to Amazon to find out what was shipped in order to get you to buy more stuff, or to prevent people from building a shopping cart app that uses data from your Amazon emails.