WHAT A HARNESS IS

PRACTICE LAB CONNECTION Try this chapter's prompts against the Practice Lab's Resume Review Agent harness, which you will build in Part Sixteen and Chapter 65 and whose files are listed in Appendix G. Look especially at its core loop file, main_loop.py, and at the control-plane notes that accompany it. Even before it is built, you can practice by taking a short description of the lab, such as "reads resumes, compares them with a job posting, writes a review," and listing which pieces belong to the model and which to the harness. Reading a resume and judging its fit is the model's job. Opening the file, counting the resumes, saving the results, limiting the number of steps, and logging every action are the harness's job.