AGENTS.md explained: one root Markdown file to rule every AI coding tool
adnan_hashmi · x · 2026-10-24
Cobus Greyling explains AGENTS.md — arguably the most practical upgrade you can make to a codebase in 2026: a single plain-Markdown file at the repo root describing rules, style, tests and review requirements that every supported AI coding tool follows automatically.
Key points:
- Problem solved: tools previously each demanded their own config (.cursorrules, CLAUDE.md, GEMINI.md, Copilot instructions), leading to 4-6 overlapping files, duplication, version drift and stale instructions
- Community convergence: the ecosystem settled on this one convention in mid-2025
- Support: Cursor, GitHub Copilot agent mode, Claude Code, Continue.dev, Aider, OpenHands, Windsurf, Amp, Jules, Factory, RooCode, Codex, Zed and more
- Impact: most developers report noticeably fewer hallucinations and corrections in the first session; author estimates 8-12 minutes to write one
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