Banana is a tool for the analysis of information leakage in mobile agent specifications. The language considered is Mobile Ambient calculus, initially proposed by Cardelli and Gordon with the main purpose of explicitly modeling mobility [5]. Sites and agents (i.e., processes) are modeled as nested boxes (i.e., ambients), provided with capabilities for entering, exiting and dissolving other boxes. This specification language provides a very simple framework to reason about information flow and security when mobility is an issue [1].