Long-horizon web agents often waste context by reading full DOM and accessibility trees at every action step. A new paper argues that this observation pattern can degrade reasoning before the task is complete.
Signal-Driven Observation adds a dedicated sub-call that reads the full page but returns only task-relevant elements and selectors, then refreshes only when a lightweight signal detector indicates the page has changed.
The idea is relevant for practical browser agents because context efficiency is becoming as important as model quality for long workflows.