Research date: 23 June 2026 · Scope: Codex CLI, Kimi Code CLI, MiMo Code, Cursor (cursor-agent), Antigravity CLI (agy), OpenCode. Claude Code excluded (already known). Multi-agent cited research.
- Project-level
AGENTS.mdis effectively universal. Every tool here reads anAGENTS.mdat the repo root. Your existingAGENTS.md → CLAUDE.mdsymlink per project already works for all of them. - Global instructions are the messy part — each tool reads a different global path, and two of the tools have no global instructions file at all.