Cairn brings all the important questions up to be decided upfront, so you can hand long-running execution to your agent confidently. — for Claude Code, Google Antigravity, and Codex.
Latest release 1.9.0 · 26 Oct 2026
3 files for Claude Code, Codex and OpenCode: cairn, cairn CLAUDE.md, cairn AGENTS.md — 17,127 tokens loaded in every session.
CLAUDE.md B 17,123 tok AGENTS.md A 4 tok .claude/settings.json A — These files are uHappyLogic/cairn's own configuration — they tell Claude Code, Codex and OpenCode how to work on this repository, so they are not mods to install elsewhere. Copy one as a starting point and replace the parts that are about this project.