I so like simple trades, and using RSI as a trigger is one of those trade plans that keep things very simplistic. The signal can be for a short or long, and should be done within the context of your other trading process components (like time frame, position size, etc.)
For an example this week, I bring you the Weekly chart of $CF:
Here are several areas using RSI where a short position entry would have been a high probability trade. When you exited the trade would have been based on your stop rules, target(s), any option components you used, etc.