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AGENTS.md vs CLAUDE.md vs .cursorrules: where each format stands in 2026

This story is from 2026-09-17. It is preserved in the archive; the latest stories are on the live feed.

Two years ago this question did not exist. Now most working developers maintain somewhere between two and four agent instruction files per repo, and the files disagree with each other more often than they agree. This is the current state of each format, what it actually does, and a setup that avoid…

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  1. 2026-09-17 10:10 · DEV Community — AI
    AGENTS.md vs CLAUDE.md vs .cursorrules: where each format stands in 2026

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