# Claude Code adds support for AGENTS.md in version 2.1.277

DevFeed: [Claude Code adds support for AGENTS.md in version 2.1.277](<https://devfeed.tech/articles/quoting-thariq-shihipar-55211.md>)

Original publisher: [Read original article](<https://simonwillison.net/2026/Sep/18/thariq-shihipar/>)

Author: Simon Willison

Published: 2026-09-18T19:09:27Z

Content type: release

Language: en

Sources: [Simon Willison's Weblog](<https://devfeed.tech/sources/simon-willison-s-weblog.md>)

Topics: [Claude Code](<https://devfeed.tech/topics/claude-code.md>), [AI-assisted coding](<https://devfeed.tech/topics/ai-assisted-coding.md>), [anthropic](<https://devfeed.tech/topics/anthropic.md>)

Tags: [agents-md](<https://devfeed.tech/tags/agents-md.md>), [ai](<https://devfeed.tech/tags/ai.md>), [ai-2-242](<https://devfeed.tech/tags/ai-2-242.md>), [anthropic](<https://devfeed.tech/tags/anthropic.md>), [anthropic-338](<https://devfeed.tech/tags/anthropic-338.md>), [claude](<https://devfeed.tech/tags/claude.md>), [claude-code](<https://devfeed.tech/tags/claude-code.md>), [claude-code-128](<https://devfeed.tech/tags/claude-code-128.md>), [claude-md](<https://devfeed.tech/tags/claude-md.md>), [coding-agents](<https://devfeed.tech/tags/coding-agents.md>), [coding-agents-249](<https://devfeed.tech/tags/coding-agents-249.md>), [generative-ai](<https://devfeed.tech/tags/generative-ai.md>), [generative-ai-1-988](<https://devfeed.tech/tags/generative-ai-1-988.md>), [llms](<https://devfeed.tech/tags/llms.md>), [llms-1-954](<https://devfeed.tech/tags/llms-1-954.md>), [thariq-shihipar](<https://devfeed.tech/tags/thariq-shihipar.md>), [thariq-shihipar-6](<https://devfeed.tech/tags/thariq-shihipar-6.md>)

## AI overview

Claude Code version 2.1.277 adds support for AGENTS.md. When a folder does not contain CLAUDE.md, Claude Code will check for and use AGENTS.md. The support is built on Claude Code mods, including a built-in mod and planned custom mod support.

## Source excerpt

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 Tags: thariq-shihipar, coding-agents, anthropic, claude-code, generative-ai, ai, llms