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Quoting Thariq Shihipar

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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

Quoting Thariq Shihipar
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Simon Willison’s Weblog

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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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This is a quotation collected by Simon Willison, posted on 18th September 2026.

ai 2,241

generative-ai 1,987

llms 1,953

anthropic 338

coding-agents 249

claude-code 128

thariq-shihipar 6

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  • AI generation is temporarily unavailable; this entry was preserved with deterministic fallback metadata.
  • We're adding support for AGENTS.md to Claude Code. Starting today in version 2.1.277, if there…

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