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Anthropic adds support for OpenAI-contributed AGENTS.md spec to Claude Code

Source: The Register
Time: 4:49 AM
Weight: 94/100High importance
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What happened?

Anthropic has announced that its Claude Code tool will now support the AGENTS.md specification, a set of instructions for AI agents originally contributed by rival OpenAI.

Why it matters

According to Claude Code engineer Thariq Shihipar, version 2.1.277 of the software will automatically look for and utilize AGENTS.md files if the company's native CLAUDE.md format is not present in a project folder.

Original Source

Detailed explanation

This update addresses a significant compatibility challenge for software developers who work across different artificial intelligence platforms.

These Markdown files serve as instructions that define an AI agent's behavior, preferred coding conventions, and tool usage for every request.

By adopting the AGENTS.md standard—which OpenAI placed under the Linux Foundation's Agentic AI Foundation to encourage industry-wide use—Anthropic is helping users avoid the need to maintain redundant sets of documentation for different AI services.

The shift affects a broad range of developers, as more than 60,000 open-source projects had already implemented the AGENTS.md format by late 2025.

While Anthropic previously prioritized its own specific standards, this move allows users to manage their AI configurations more efficiently through a single, tool-agnostic file.

Developers can manage how the tool handles these instruction files by using a configuration command within the Claude Code interface.

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