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Agent Evaluation for Tool Use: Why pass@1 Lies, and How to Measure Reliability

Agent evaluation for tool use: why pass@1 hides unreliability, the pass^k metric, BFCL and tau-bench, state-based vs LLM-judge scoring, and building a harness.

Diagram contrasting a strong single-attempt pass@1 bar with an exponentially decaying pass^k series, the real reliability metric for agents

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