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Claude Code AGENTS.md Interop Handbook
One instruction file across Claude Code, Codex, Copilot, Cursor, Gemini CLI, and more — verified setup, copy-paste templates, rollback-safe migration.
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About the Book
Stop maintaining CLAUDE.md and AGENTS.md as two files that drift apart. Claude Code reads CLAUDE.md; Codex, Amp, and GitHub Copilot read AGENTS.md natively; Cursor, Windsurf, and Cline read their own files; Aider and Gemini CLI read AGENTS.md only after you configure them. That gap is the single largest open feature request in Claude Code — issue #6235, 5,200+ reactions, still unaddressed nine months on — and a duplication tax on everyone who runs more than one AI coding tool. This handbook removes it: a verified 9-tool matrix (which file each tool reads, whether it needs setup, and the one thing to watch, checked against every tool's official docs on 2026-06-02); six sync paths ranked by trade-off (the official @AGENTS.md import, symlink, pre-commit sync, SessionStart hook, direnv, CI drift check); copy-paste templates for all nine tools plus a complete repo layout; a rollback-safe migration runbook to move CLAUDE.md to AGENTS.md without losing Claude-only behavior; and a team drift guard that makes divergence fail loudly. 21 pages, dense and practical, with free updates as conventions change. By an independent operator who runs Claude Code 800+ hours and maintains cc-safe-setup (free MIT hooks, 1,700+ users). Try the free AGENTS.md Setup Generator and field-guide Gist first; buy this for the full matrix, the runbook, and the templates in one place. Independent handbook — not affiliated with Anthropic, OpenAI, GitHub, or Google.
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