guild setup previews the files it will create, overwrite, or skip and asks for confirmation before making changes, then prompts you to choose a coding assistant — Claude Code, Codex, or Gemini. Pass --provider <claude|codex|gemini> to select one non-interactively, -y/--yes to accept the preview without confirming, and --force to overwrite existing skill files. Add --claude-md, --agents-md, or --gemini-md to also generate a project instructions template for the chosen assistant. Alongside the agent development skill, guild setup installs a Factory setup skill for the chosen assistant.