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 copies · 90 days. Times the install command was copied on this site in the last 90 days, bots filtered.: 8
skills.sh installs: 1.1K
GitHub stars: 3.8K
last updated: Jul 14, 2026

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Install

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

Installs into .claude/skills of the current project.

Files

Sigma Tutor

Personalized 1-on-1 mastery tutor. Bloom's 2-Sigma method: diagnose, question, advance only on mastery.

Usage

/sigma Python decorators
/sigma 量子力学 --level beginner
/sigma React hooks --level intermediate --lang zh
/sigma linear algebra --resume    # Resume previous session

Arguments

Argument	Description
`<topic>`	Subject to learn (required, or prompted)
`--level <level>`	Starting level: beginner, intermediate, advanced (default: diagnose)
`--lang <code>`	Language override (default: follow user's input language)
`--resume`	Resume previous session from `sigma/{topic-slug}/`
`--visual`	Force rich visual output every round