Definition
AGENTS.md is an emerging convention for project-level instructions shared across AI coding agents — parallel to tool-specific files like CLAUDE.md.
Key Points
- 2026-09-18: claude-code reads AGENTS.md when CLAUDE.md absent; configurable via /config “Project instructions” (2026-09-18-claude-code-agents-md-support)
- Not yet on Bedrock, Vertex, or Foundry deployments
- Interoperability play for multi-agent developer toolchains