Every eval question in the prep canon is about answer quality. This agent does not produce answers, it moves freight. You cannot score a reroute for faithfulness, and the candidate who tries has not understood what they built.
Build an agent that reroutes shipments when a hub goes down, and design the eval suite that keeps it from overspending.
Every eval question in the prep canon is about answer quality. This agent does not produce answers, it moves freight. You cannot score a reroute for faithfulness, and the candidate who tries has not understood what they built.
Updated Aug 2026 · Grounded in real Forward Deployed Engineer interview loops and written to a senior-engineer editorial bar.
Two things separate strong answers. The first is noticing that a single objective breaks this: an agent told to protect delivery rates will expedite everything and hit the service target while destroying the margin, so the eval has to be a frontier, not a number. The second is the last mile. The prompt says 500 warehouse managers on different regional systems, which means the agent's decision has to arrive inside whatever tool each region already uses, and an agent whose output nobody sees is indistinguishable from an agent that does nothing.
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