Claude Code Adds Support for AGENTS.md Instruction Files
Anthropic's Claude Code tool now automatically falls back to reading AGENTS.md files when a repository lacks a CLAUDE.md configuration file. This update allows developers to use open, multi-agent instruction files without creating separate configuration files for Claude. This change signals Anthropic's alignment with an emerging vendor-neutral standard for AI agent instructions, reducing ecosystem fragmentation. It enables developers to maintain a single repository configuration file that works across multiple AI coding tools. Claude Code checks for its proprietary CLAUDE.md file first, falling back to AGENTS.md only when CLAUDE.md is absent. This feature eliminates the need for manual workarounds such as creating symbolic links between AGENTS.md and CLAUDE.md.
## BACKGROUND
AI coding assistants rely on repository-level context files to learn codebase structures, testing procedures, and formatting guidelines. Anthropic originally introduced CLAUDE.md specifically for Claude Code, whereas AGENTS.md was developed by the community as a shared standard compatible across different AI tools.