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Accessibility tree vs screenshots: the token math behind my browser agent

This story is from 2026-09-12. It is preserved in the archive; the latest stories are on the live feed.

I run an AI agent in a browser all day. Every "look at this page" is a context-window decision, and most agent stacks make the expensive choice by default: they screenshot the page and let a vision model figure it out. There is a cheaper way that also clicks better. The browser already maintains a…

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  1. 2026-09-12 21:02 · DEV Community — AI
    Accessibility tree vs screenshots: the token math behind my browser agent

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