harness

Nvidia researchers report that a custom agent harness with a supervisory component drove Claude Opus 5 from a 30% baseline score to a perfect 100% on the ARC-AGI-3 benchmark. The findings add to mounting evidence that scaffolding, not the underlying model, is the dominant factor in long-horizon agentic performance.

Fred Schott, creator of the Astro web framework, has released Flue 2, the first stable version of his agent development framework. The update introduces React-inspired 'Agent Hooks' that let developers build agents whose configuration changes dynamically during a conversation rather than being fixed in advance.