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How do you evaluate an agent's trajectory and tool-use accuracy, not just its final answer?

Final-answer accuracy hides how an agent got there. The signal is trajectory-level metrics: tool-selection and argument accuracy, step efficiency, and matching against reference paths, plus when exact-match is the wrong yardstick.

Updated Aug 2026 · Grounded in real Applied AI Engineer interview loops and written to a senior-engineer editorial bar.

Final-answer accuracy hides how an agent got there. The signal is trajectory-level metrics: tool-selection and argument accuracy, step efficiency, and matching against reference paths, plus when exact-match is the wrong yardstick.

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