LaunchDevelopersSeptember 18, 2026

Claude Code 2.1.277 adds AGENTS.md support

Read original source →simonwillison.net

In projects with no CLAUDE.md, Claude Code now reads AGENTS.md instead; the behavior is toggleable under "Project instructions" in /config. The release ships 87 CLI changes, including claude -p and Agent SDK sessions that previously hung now reporting errors and exiting with code 1.

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