Sigma

A proper Socratic tutor that refuses to give you answers. It diagnoses your current level first, breaks topics into atomic concepts, then gates your progress at 80% mastery before moving forward. The whole thing runs on Bloom's 2-Sigma method with spaced repetition baked in. It generates HTML roadmaps, Excalidraw concept maps, and tracks misconceptions across sessions in a persistent learner profile. Invoke it with /sigma followed by any topic, or just say you want to learn something. The core promise is genuine: it will ask questions and wait for you to work things out, not hand you explanations. If you've ever wished for a patient tutor who actually makes you think instead of just explaining, this is that.

Install to Claude Code

npx -y skills add sanyuan0704/code-review-expert --skill sigma --agent claude-code