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Anthropic added AGENTS.md support to Claude Code starting in version 2.1.277, using it automatically when no CLAUDE.md exists, a step toward a shared configuration standard across coding agents.

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Claude Code Adds AGENTS.md Support: Anthropic Moves Toward a Unified Agent Standard

What changed

FAQ

What is AGENTS.md?

It is an open, plain-text file placed at a repository root that tells AI coding agents the project's conventions, code style, and allowed commands. It is adopted by tools including Codex, Cursor, and Claude Code.

How does AGENTS.md differ from CLAUDE.md?

CLAUDE.md is specific to Claude Code, while AGENTS.md is a shared standard across tools. In version 2.1.277, Claude Code looks for CLAUDE.md first and falls back to AGENTS.md if it is missing.

Should MENA development teams switch to AGENTS.md now?

Yes, if the team uses more than one AI coding tool, since a single file serves all of them and cuts maintenance overhead. Teams using Claude Code exclusively can keep CLAUDE.md without issue.

What are Mods in Claude Code?

They are an upcoming way to customize the Claude Code harness. AGENTS.md support is built on them, suggesting customization will expand to additional behaviors and tools.

Source: Simon Willison (LLM & tools)

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