AGENTS.md Gives AI Coding Agents the Repo Rules That README Files Miss

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README files are written for human developers and typically explain what a project is and how to run it, but they lack the operational instructions that AI coding agents need to work reliably. Without a dedicated guidance file, agents must guess details like which package manager to use, which files are off-limits, and what constitutes a completed task. AGENTS.md is a purpose-built file that provides coding agents with setup commands, test and lint instructions, file boundaries, and completion criteria before they begin work. Tools like Goose, an open-source local AI agent, can read AGENTS.md directly from a repository, reducing the need to repeat standing rules in every prompt. Developers are advised to keep AGENTS.md focused on universal repo rules and offload repeatable task routines to separate skills or extensions to prevent the file from becoming cluttered.

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