EvoHarnessBench: adding tools to agents can silently degrade abilities they already had
mohitban47 · x · 2026-09-11
Shafiq Joty's team introduces EvoHarnessBench, probing a counterintuitive question: we keep adding tools, skills, and specialist agents to agentic systems, but could an evolving harness quietly make the agent worse at tasks it could already solve? Their results show it can — and, more surprisingly, even today's self-evolving methods cannot reliably adapt to new capabilities while retaining earlier competence. The benchmark tests whether your agents can keep pace with an evolving harness.
Related event: EvoHarnessBench: Adding More Tools to Agents Can Make Them Worse(2 posts)→
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