Agents are probabilistic systems. A common mechanism to get a reliable answer from systems that can have variable output is to run them several times (ideally in separate, isolated instances) and then have something vote on the best result or use the most common result. This happens in things like rockets and aviation where you have multiple systems giving an answer and an orchestrator picking the result.

I've tried doing something similar with AI by running a prompt several times and then have an agent pick the best response. It works fairly well but it burns a lot of tokens.