Quoting Thariq Shihipar

Simon Willison's Blog Tools
ai coding claude-code agentic file-support developer-tools open-source

Summary

Claude Code version 2.1.277 adds support for AGENTS.md as an alternative to CLAUDE.md, allowing customizable project instructions through mods.

No content available
Original Article
View Cached Full Text

Cached at: 09/18/26, 11:01 PM

# A quote from Thariq Shihipar Source: [https://simonwillison.net/2026/Sep/18/thariq-shihipar/](https://simonwillison.net/2026/Sep/18/thariq-shihipar/) 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](https://github.com/anthropics/claude-code/tree/main/mods/agents-md)\! —[Thariq Shihipar](https://twitter.com/trq212/status/2101009392611278961),there are[more mods here](https://github.com/anthropics/claude-code/tree/main/mods)

Similar Articles

@omarsar0: This is the way.

X AI KOLs Timeline

Claude Code has been updated to version 2.1.277, adding support for AGENTS.md as a fallback configuration file when CLAUDE.md is not present in a folder.

Feature Request: Support AGENTS.md

Hacker News Top

Claude Code is an agentic coding tool by Anthropic that assists developers with coding tasks using natural language commands in terminal or IDE environments, featuring plugins and data collection policies.