Claude Code now also accepts instructions in OpenAI’s Agents.md format

“For enterprises, a common instruction format can become a practical control point for coding conventions, security requirements, architectural guardrails, and compliance policies,” said Charlie Dai, principal correspondent at Forrester.

But not for every Claude Code deployment

However, a common instruction format does not necessarily make AI coding agents interchangeable, Jena cautioned: “CLAUDE.md includes Claude-specific features that AGENTS.md was not designed to support, so instructions written for one agent, such as Codex, may not behave in exactly the same way when Claude Code reads them.”

There is also a deployment-related limitation to Claude Code’s AGENTS.md support, Jena pointed out, quoting Claude Code’s documentation that reads: “Your session doesn’t fetch feature flags from Anthropic, for example because you use Amazon Bedrock or another third-party provider, or you disabled telemetry. “