4 files for Claude Code, Codex and OpenCode: Stop, handbook, handbook AGENTS.md, handbook CLAUDE.md — 412 tokens loaded in every session.
AGENTS.md A 407 tok CLAUDE.md A 5 tok .claude/settings.json A — .claude/settings.json A — These files are nicograef/handbook'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.