what were the conditions imposed on gulliver for setting him free?

Gulliver is finally granted his freedom on the condition that he (1) swear to help the Lilliputians if they are ever in a war, (2) survey the surrounding land, (3) help with any building that needs to be done, and (4) deliver messages. He agrees. In return he will be granted the food and drink sufficient for 1,724 Lilliputians.