Quoting Thariq Shihipar
Anthropic's Claude Code 2.1.277 now reads AGENTS.md project instruction files when no CLAUDE.md is present, built on its new mods system.
Thariq Shihipar announced that Claude Code version 2.1.277 adds AGENTS.md support: in folders without a CLAUDE.md file, Claude will check for and use AGENTS.md for project instructions. The feature is implemented as a built-in mod on top of Claude Code mods, an upcoming mechanism for customizing the Claude Code harness. The mod source is published so developers can build custom versions of project-instruction handling.
- AGENTS.md support ships starting in Claude Code version 2.1.277
- Only used when no CLAUDE.md file exists in the folder
- Built on Claude Code mods, an upcoming harness customization mechanism
- Mod source is public, enabling custom project-instruction mods
- Vendors
- Anthropic
- Products
- Claude Code
- AI models
- Claude
From the original article
We're adding support for AGENTS. md to Claude Code. Starting today in version 2.
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