AGENTS.md Emerges as Open Standard to Brief AI Coding Agents on Repo Context

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AGENTS.md is a single Markdown file placed at a repository's root, designed to give AI coding agents like Codex, Cursor, and Copilot the project context they need to work effectively. Unlike a README, it focuses specifically on actionable information for agents: build commands, test instructions, directory structure, conventions, and guardrails. Originally pioneered by OpenAI's Codex, the format was donated to the Agentic AI Foundation under the Linux Foundation in December 2025 and is now maintained as an open standard. Experts warn that the file fails when it is either too sparse to be useful or too lengthy for agents to parse reliably, with stale commands and vague instructions cited as common pitfalls. Keeping the file short, specific, current, and free of duplicated README content is considered essential to making it genuinely useful.

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