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Hacker News front page474 min readrelease notesintermediate

Claude Code now reads AGENTS.md if there is no Claude.md

Read on claude.comHN 733·275 comments

Summary

Claude Code 2026‑09‑18 release adds AGENTS.md fallback when CLAUDE.md is missing and makes the auto‑mode classifier server‑side by default. It also introduces several new env vars, header maps, and dozens of bug‑fixes that improve stability and startup speed.

  • If a project lacks CLAUDE.md, Claude Code now reads AGENTS.md for instructions (configurable under /config).
  • Auto mode now defaults to the server‑side classifier, avoiding extra billing unless opted out via CLAUDE_CODE_AUTO_MODE_SERVER=0.
  • New env var CLAUDE_GATEWAY_PROXY_IS_EGRESS_BOUNDARY=1 forces gateways to send hostnames to a forward proxy instead of resolving locally.
  • Gateway upstreams can now include a static headers: map to inject headers into proxy requests.

Developers building or using Claude Code need to know the new instruction source, default classifier behavior, and configuration flags that affect security and performance.

6/10
devopscliapi design

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