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llms.txt v2: What the Spec Says, and What 137,000 Domains Show

This story is from 2026-09-20. It is preserved in the archive; the latest stories are on the live feed.

Originally published on angeo.dev . Checked against llmstxt.org v2, revised 10 August 2026, and against the published request data as of September 2026. We shipped a validator that could certify a broken llms.txt file as valid. The bug was simple. The spec recommends a short summary in a blockquote…

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  1. 2026-09-20 19:17 · DEV Community — AI
    llms.txt v2: What the Spec Says, and What 137,000 Domains Show

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