Claude Code now reads AGENTS.md, and auto mode safety checks are free

Sep 21, 2026 · Issue 8 · 5 sources, 6 articles

From September 21, Claude Code accepts OpenAI's AGENTS.md format as a fallback, which reduces the sprawl of instruction files. API users are also not charged for auto mode's safety checks.

Who is affected and how

senior developer

A single AGENTS.md is enough to maintain for several tools; a separate Claude-specific file is not required.

tech lead

Standardize the instruction file across repositories so the team stays tool-agnostic.

Sources

• Claude Code now also accepts instructions in OpenAI’s Agents.md formatinfoworld · Sep 21, 2026
• Claude Code will also be able to use OpenAI's AGENTS.md markdown filesprog.hu · Sep 21, 2026 · magyar
• Claude Code now also accepts instructions in OpenAI’s Agents.md format | InfoWorldinfoworld.com · Sep 21, 2026
• Claude Code Adds AGENTS.md Fallback, Cutting Instruction File Sprawldevops.com · Sep 21, 2026
• Claude Code stops charging API users for auto mode's safety checks, and now reads AGENTS.mdmixed news · Sep 21, 2026

Machine-generated summary based on the titles and excerpts of the source articles. The facts come from the linked article.