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Proving what a URL allowlist decides, in Lean 4

This story is from 2026-10-28. It is preserved in the archive; the latest stories are on the live feed.

This article describes URLFence as of commit ea3c061 (CI: run 40618042270 ). AI agents fetch web pages for you, and their tools are supposed to stay on an allowlist of hosts. That kind of check ("is this URL's host allowed?") keeps going wrong in the same few ways, in agent tools and elsewhere: A s…

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  1. 2026-10-28 17:46 · DEV Community — AI
    Proving what a URL allowlist decides, in Lean 4

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