Agent failure modes — CCA-F Exam Prep

$847 in API costs. One agent. Fourteen hours. It was still trying to 'improve' a document that was perfect at iteration 3.
A company deployed an agent to improve marketing copy. Loop: write a draft, evaluate it, improve it, repeat. No maximum iterations. No spending limit. No stop condition except 'until it's perfect.' Draft 3 was great. Draft 2,941 was worse. The agent couldn't tell the difference.