# Trial by Trace: Benchmarking AI Agent Harnesses for Reliability and Failure Attribution > Source: > Published: 2026-10-27 02:00:01+00:00 LLM agents are increasingly used to solve real-world problems, and their effectiveness depends on both the underlying models and the harnesses that support their operation. However, most existing benchmarks focus on model capabilities and overall agent performance, with limited attention to the eval