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Anthropic Has Updated Claude Code With AGENTS.md Support

The latest release allows Claude Code to read AGENTS.md files as a fallback, reducing setup friction for developers.

Updated on Sept. 18, 2026 in Artificial Intelligence

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Anthropic updated its Claude Code software to include native support for AGENTS.md files, streamlining setup processes for developers managing multiple AI agents. AI Illustration. Upload story photo >

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Anthropic released Claude Code version 2.1.277, introducing native support for the AGENTS.md instruction format. This update enables the software to automatically read project instructions from AGENTS.md files whenever a proprietary CLAUDE.md file is not detected.

Why it matters

The change aims to streamline developer workflows by reducing setup friction when managing multiple AI coding agents. By supporting a widely adopted instruction standard, Anthropic simplifies the integration process for projects already utilizing the AGENTS.md format.

The update to version 2.1.277 allows the Claude Code tool to scan for AGENTS.md files in a project hierarchy if the default CLAUDE.md is missing. Currently, this compatibility is limited to local environments and does not extend to Bedrock, Vertex, or Foundry.

The players

Anthropic

An AI research and safety company that develops the Claude series of large language models and associated coding tools.

The details

Developers can now configure their project setups to prioritize either format or utilize both simultaneously, facilitating better interoperability between different coding agents. This marks a departure from the previous requirement where users were strictly tied to the proprietary CLAUDE.md file structure.

Timeline

  1. Anthropic announced a redesign of Claude Code Projects on September 17, 2026.

  2. Claude Code version 2.1.277 was released on September 18, 2026.

The Tech Race

This integration reflects a broader shift toward standardized configuration protocols for AI agent workflows within software development. By adopting the AGENTS.md instruction format, Anthropic positions its tools to better compete in an ecosystem populated by various AI coding assistants.

Developers currently using the AGENTS.md format can now integrate Claude Code into their projects without needing to migrate or create duplicate CLAUDE.md files. This flexibility simplifies the configuration process and allows for faster deployment of AI-assisted coding workflows.

The takeaway

Standardizing instruction formats across AI tools can significantly lower barriers to adoption for technical teams. Developers should evaluate their current project configurations to determine if utilizing the AGENTS.md fallback can simplify their ongoing maintenance and automation efforts.

Further reading

For more information on the evolving landscape of developer tools, see Artificial Intelligence.

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Do you believe standardized configuration files for AI coding tools make your development work easier?