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Applied AI·September 19, 2026·1 min read

Anthropic adds support for the AGENTS.md instructions spec to Claude Code; OpenAI contributed AGENTS.md to the Agentic AI Foundation last year

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Convergence on AGENTS.md across Claude Code and OpenAI tools is the first real move toward a cross-vendor agent instruction layer. If you’re building agentic workflows, align on this spec now so you can swap underlying models without rewriting orchestration logic.