The Hidden Tax of Re-Running Tests in Agent Development

When AI agents run tests and see failures, they often lack the ability to retain the detailed output they just received. This forces them to either guess at the problem, ask for clarification, or re-run the entire test suite—wasting minutes in each development loop. By using Unix's tee utility to persist test output in logs, agents can efficiently grep for specific failures without incurring this performance penalty, dramatically improving development velocity.