Claude Code now falls back to AGENTS.md when a project has no CLAUDE.md
Claude Code version 2.1.277, released September 18, 2026, adds support for reading AGENTS.md in projects that lack a CLAUDE.md file. The behavior is a fallback rather than a merge, so repositories that already have a CLAUDE.md see no change. The option can be toggled under Project instructions in /config, and it is not yet available on Amazon Bedrock, Google Vertex AI, or Microsoft Foundry. The official memory documentation had not been updated at the time of writing and still states that only CLAUDE.md is read, so users are advised to rely on the release notes and verify behavior in their own sessions.
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