3 files for Claude Code, Codex and OpenCode: claude_onboarding_agent, claude_onboarding_agent AGENTS.md, claude_onboarding_agent CLAUDE.md — 2,841 tokens loaded in every session.
AGENTS.md A 178 tok CLAUDE.md A 2,663 tok .claude/settings.json A — These files are a2ngerer/claude_onboarding_agent'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.