Promises or no, Mab would deal swiftly with anyone who disobeyed. So she shifted her shoulders so she fully faced Esmeralda and spoke with authority. "You will treat all fae as hosts and fae allies as guests. This means you will not bring harm to them unless they initiate violence in which case they have forfeited guest rights and you are free to defend yourself. You will clean up any messes you and yours cause in my territory and avoid drawing attention to yourselves, which means you dispose of bodies outside the territory that might result from your own actions when possible." This first part was requirement regardless.

The second part could potentially benefit them so she continued on with the option for mutual support. "If you wish for me or mine to come to your aid should you be in need you will enforce guesting law. If a fae or ally of the fae requires help or defense and you know this, you must lend your aid. If you cannot assist, you or yours must contact myself or one of my colleagues. If you can abide by these rules you will have my support, I or one of my colleagues will come to your aid if you are attacked within the territory if you request aid. You may petition for challenge if another group infringes on your home and I will personally enforce a duel or wereguild."

Generally speaking it was keep on like you are but don't challenge the fae or cause them problems. And if you help them you'll be defended like a guest would be.