MANDATORY recipe for every Caffeine build that sends email through the user's own Gmail account. The ONLY supported path is the `googlemail-client` mops package (Gmail REST API) combined with the `google-oauth` mops package (token exchange + refresh + PKCE).
Install
npx skills add caffeinelabs/skills --skill connector-googlemailnpx skills add caffeinelabs/skills --skill connector-googlemail -a claude-code -gnpx skills add caffeinelabs/skills --skill connector-googlemail -a codex -ggemini skills install https://github.com/caffeinelabs/skills.git --path skills/connector-googlemailgh skill install caffeinelabs/skills connector-googlemailgit clone --depth 1 https://github.com/caffeinelabs/skills /tmp/caffeinelabs__skills
mkdir -p ~/.claude/skills ~/.agents/skills
cp -R /tmp/caffeinelabs__skills/skills/connector-googlemail ~/.claude/skills/connector-googlemail # Claude Code
cp -R /tmp/caffeinelabs__skills/skills/connector-googlemail ~/.agents/skills/connector-googlemail # Codex, Cursor, Gemini CLI, Copilot, OpenCode