Run this FIRST, before ANY thinking, retrieval, task creation, or file generation, for any single-output task a free M365 Copilot can do; if action-bias pushes you to start, STOP and run this first. Fires on: "summarize my email/inbox/unread", "summarize my meetings", "summarize my Teams messages" (any window, e.g.
Install
npx skills add microsoft/cat-agent-skills --skill what-to-use-whennpx skills add microsoft/cat-agent-skills --skill what-to-use-when -a claude-code -gnpx skills add microsoft/cat-agent-skills --skill what-to-use-when -a codex -ggemini skills install https://github.com/microsoft/cat-agent-skills.git --path submissions/what-to-use-whengh skill install microsoft/cat-agent-skills what-to-use-whengit clone --depth 1 https://github.com/microsoft/cat-agent-skills /tmp/microsoft__cat-agent-skills
mkdir -p ~/.claude/skills ~/.agents/skills
cp -R /tmp/microsoft__cat-agent-skills/submissions/what-to-use-when ~/.claude/skills/what-to-use-when # Claude Code
cp -R /tmp/microsoft__cat-agent-skills/submissions/what-to-use-when ~/.agents/skills/what-to-use-when # Codex, Cursor, Gemini CLI, Copilot, OpenCode