# Stateful Harness: Separating World State Evolution from Video Rendering to Support Rule-Governed Interaction

- Source: HuggingFace Daily Papers
- Published: 2026-10-19T00:00:00.000Z
- RoboHot: https://robohot.news/en/items/e3bvmhgyq5gg8uoe6a7zun7oo
- Original: https://huggingface.co/papers/2610.26811

## Summary

The paper proposes the Stateful Harness framework, which separates world evolution from video rendering, using a frozen video model to render events and write back the world state, in order to support rule-governed interaction with hidden state. The authors build the WorldState-Bench benchmark, containing 50 counterfactual twin pairs that share an initial frame and action but differ in hidden state and required outcome.