Anthropic on Friday surprised the developer community by supporting rival OpenAI's mechanism for passing marching orders to AI agents.
Until now, developers who use Claude Code alongside OpenAI Codex or other non-Anthropic tools have had to maintain two sets of Markdown instructions for their AI agents: CLAUDE.md and AGENTS.md, not to mention project-specific versions of these files.
As of December 2025, more than 60,000 open source projects carried out AGENTS.md.
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Until now, developers who use Claude Code alongside OpenAI Codex or other non-Anthropic tools have had to maintain two sets of Markdown instructions for their AI agents: CLAUDE.md and AGENTS.md.
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Devs cheer relief from compatibility headache.
Anthropic on Friday surprised the developer community by supporting rival OpenAI's mechanism for passing marching orders to AI agents.
"We're adding support for AGENTS.md to Claude Code," said Claude Code engineer Thariq Shihipar in a social media post.
Claude Code users can toggle this behavior, he said, with the /config command.
Until now, developers who use Claude Code alongside OpenAI Codex or other non-Anthropic tools have had to maintain two sets of Markdown instructions for their AI agents: CLAUDE.md and AGENTS.md, not to mention project-specific versions of these files.
Last year, OpenAI contributed AGENTS.md to the Agentic AI Foundation, under the Linux Foundation, in a bid to build support for its standard. As of December 2025, more than 60,000 open source projects carried out AGENTS.md.
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