- What changed
- Claude Code version 2.1.277 added support for AGENTS.md when CLAUDE.md is absent in a folder.
- Why you should care
- Standardizing instruction files like AGENTS.md helps coding tools interoperate smoothly across different agent harnesses.
- Your move
- Watch. Monitor how developer workflows standardize around multi-agent instruction files.
- What to watch next
- Release of additional custom mod features and documentation for Claude Code.
- Event
- release
- Event date
- Sep 18, 2026
- Relevant to
- General AI readers