Creates a Check for Understanding (CFU) for a math topic or standard: 1–3 targeted formative items whose distractors come from documented student misconceptions, plus a teacher guide routing each likely response to a specific next instructional step. Load BEFORE asking any clarifying question about grade, standard, or topic.
Install
npx skills add anthropics/k12-teacher-skills --skill k12-check-for-understandingnpx skills add anthropics/k12-teacher-skills --skill k12-check-for-understanding -a claude-code -gnpx skills add anthropics/k12-teacher-skills --skill k12-check-for-understanding -a codex -ggemini skills install https://github.com/anthropics/k12-teacher-skills.git --path plugin/skills/k12-check-for-understandinggh skill install anthropics/k12-teacher-skills k12-check-for-understandinggit clone --depth 1 https://github.com/anthropics/k12-teacher-skills /tmp/anthropics__k12-teacher-skills
mkdir -p ~/.claude/skills ~/.agents/skills
cp -R /tmp/anthropics__k12-teacher-skills/plugin/skills/k12-check-for-understanding ~/.claude/skills/k12-check-for-understanding # Claude Code
cp -R /tmp/anthropics__k12-teacher-skills/plugin/skills/k12-check-for-understanding ~/.agents/skills/k12-check-for-understanding # Codex, Cursor, Gemini CLI, Copilot, OpenCode