AI brief
Anthropic added AGENTS.md support to Claude Code version 2.1.277, so Claude will check for and use AGENTS.md in a folder when no CLAUDE.md is present.
Written by AI from Simon Willison's Weblog's published text.
Background
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Anthropic
- Latest funding
- Growth · $65B · 28 May 2026
- Newest model on the API
- Claude Haiku 5.5 · 7 Oct 2026 · $0.1 in / $0.5 out per million tokens
Source
“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.”
Interpretation or community commentary rather than straight reporting.
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