Quoting Thariq Shihipar
Mirrored from Simon Willison for archival readability. Support the source by reading on the original site.
18th September 2026
We're adding support for AGENTS.md to Claude Code.
Starting today in version 2.1.277, if there is no CLAUDE.md in a folder, Claude will check for and use AGENTS.md.
AGENTS.md support is built off of Claude Code mods, our upcoming way to customize the Claude Code harness.
This is a built-in mod, but you’ll be able to build custom versions of project instructions yourself as you’d like too.
You can see the source for the mod here!
— Thariq Shihipar, there are more mods here
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