alt Hacker Newschoose not to support them in return if it is a real problem
otherwise a simple symlink from AGENTS.md -> CLAUDE.md works well enough
disclaimer, I only use open weight models and open source harnesses so have no stake in this either way, other than I support devs who do use claude (for now) and the symlink solution has worked fine for us
But its not just claude.md. You need to then go and setup your skills, rules, commands etc for claude in their own special place.
Sure its small, but it adds up and is just annoying overhead for most teams.
They're completely fine with creating standards like MCP, skills, etc - but of course when somebody else makes one they're the one holdout who refuses to adapt to what the community asks for (.agents folder, AGENTS.md, etc).