Claude Code version 2.1.277 adds support for AGENTS.md, which Claude will use for project instructions when no CLAUDE.md file is present in a folder. The feature is built on Claude Code mods, an upcoming customization system for the harness, and ships as a built-in mod whose source is publicly available. Users will also be able to build custom versions of project instructions. The announcement was made by Thariq Shihipar.
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