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Replacing browser-agent tool loops with eval() in a Chrome sandbox

We built a browser-agent harness where the model writes code instead of taking tool calls one at a time. Using eval() inside a Chrome extension sandbox, it separates control flow from permissions, enabling efficient and deterministic workflow automation.

SourceHacker News AIAuthor: arjunchint
Replacing browser-agent tool loops with eval() in a Chrome sandbox
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Summary only

Under the source content permission, this page provides an editorial summary, key points, and a link to the original article.

Key points and analysis

Article intelligence

EngineersIntermediate

Key points

  • Shift browser agents from iterative tool-call loops to model-written code executed via eval() in a Chrome sandbox.
  • Sandbox isolates permissions; generated code can only call privileged operations via RPC to the parent runtime.
  • Local sandbox leverages the browser's existing authenticated state, avoiding remote sandbox complexity.
  • Aligns with Cloudflare Agent Lee and AI Subroutines, but more lightweight and direct.

Highlights and analysis are generated automatically and may contain errors. Check the original source.