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How our browser agent stopped spending 58% of its tokens

This story is from 2026-09-28. It is preserved in the archive; the latest stories are on the live feed.

TL;DR. A browser agent sees a page as a text accessibility tree. After every click it used to get the whole tree again, even when two lines of the page had changed. We now send the model only the changes (a diff) and strip what the model never uses. On a real 98-step browsing chat, page states went…

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  1. 2026-09-28 13:27 · DEV Community — AI
    How our browser agent stopped spending 58% of its tokens

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