Creating an App that automatically answers to Tweets



I’ve got a question regarding automatic tweets / twitter bots. A client is requesting an application that answers to Tweets with a certain hash-tag or user-name, I’m aware that many platforms will handle such ‘auto-responders’ as spam but I’ve seen several ones working on Twitter (including the nyan cat one). The app is for a marketing campaign and not at all meant to intrude the experience of users who aren’t aware or not interested in the campaign.

My question is, are these kind of apps allowed at all? Are there any guidelines I should stick to in this case?