In recent times, mobile agents have come out as foremost programming standard for distributed applications. These agents are the smart programs that operate autonomously in support of a user and can move around from one host to another host in a network with the intention of satisfying the requests made by their clients. A precondition for their utilization, on the other hand, is that they must be carried out consistently independent of failures. Enhancing the survivability of mobile agents in existence of agent server failures is a significant issue with the aim of continuous execution of mobile agents. As a result, it is extremely significant to make mobile agents fault tolerant. Here, this paper surveys the state of the art of fault tolerance schemes in mobile agents, formulated by various authors. These schemes provide a consistent mobile agent computation even in existence of failures.