# EVOHARNESSBENCH: Can Your Agents Keep Pace with an Evolving Harness? > Source: > Published: 2026-09-09 22:00:04+00:00 Modern LLM-based agents operate through a harness of tools, reusable skills, and specialist agents that shapes what they observe and what they can do. In practice, this harness continually evolves as new capabilities are added. We introduce EVOHARNESSBENCH, a benchmark for evaluating agents under co