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Keep AGENTS.md as the single source of agent docs: agents-sync runs before every Bash command and makes each directory canonical — AGENTS.md real file, CLAUDE.md a symlink to it. Renames a lone CLAUDE.md, creates or re-points symlinks, replaces identical duplicates; differing files are only reported, never merged. Fails open so it can never block a command. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>