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Trial by Trace paper introduces benchmark for AI agent harness reliability
TraceTrial-Bench covers 95 tasks across seven harness components and evaluated 3,420 runs over 4 harnesses and 9 models. Harness scores ranged from 59.8% to 72.0%, and 31.1% of runs succeeded despite failing at least one harness criterion.
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Trial by Trace: Benchmarking AI Agent Harnesses for Reliability and Failure Attribution