Clarification on Overages for Credits and Agent Reliability

To tag on to a thread above - more clarification on overages for credits would be great. We have run into numerous issues getting the agents we've built to not quit unexpectedly, but love that the agents are handling menial tasks when they do work. Would be great to speak to a human to understand how much credits are going to cost us so that we can relaunch our agents and have a very solid idea of costs moving forward.