Obsidian StudyVault Builder
bevibing/tutor-skills
Converts PDFs, text, web pages or a codebase into an Obsidian vault of study notes, practice questions, or a developer onboarding guide.
Generate questions from the user's own concept pages so they can find out what they saved but never learned, and compare their answers against what the pages say.
Install Second Brain Quiz
$ npx skills add undefined-ui/second-brain-os --skill second-brain-quiz -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install undefined-ui/second-brain-os second-brain-quiz --agent claude-codeProject scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).
$ git clone --depth 1 https://github.com/undefined-ui/second-brain-os.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/second-brain-quiz .claude/skills/second-brain-quiz && rm -rf skills-srcUse ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.
Claude Code skills documentation · loads skills from .claude/skills/
Install the "second-brain-quiz" agent skill from https://github.com/undefined-ui/second-brain-os/tree/main/skills/second-brain-quiz into .claude/skills/second-brain-quiz/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "second-brain-quiz", then confirm the skill loads.Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$skill-installer install https://github.com/undefined-ui/second-brain-os/tree/main/skills/second-brain-quizType this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.
$ npx skills add undefined-ui/second-brain-os --skill second-brain-quiz -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install undefined-ui/second-brain-os second-brain-quiz --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/undefined-ui/second-brain-os.git skills-src && mkdir -p .agents/skills && cp -r skills-src/skills/second-brain-quiz .agents/skills/second-brain-quiz && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "second-brain-quiz" agent skill from https://github.com/undefined-ui/second-brain-os/tree/main/skills/second-brain-quiz into .agents/skills/second-brain-quiz/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "second-brain-quiz", then confirm the skill loads.Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add undefined-ui/second-brain-os --skill second-brain-quiz -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install undefined-ui/second-brain-os second-brain-quiz --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/undefined-ui/second-brain-os.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/skills/second-brain-quiz .cursor/skills/second-brain-quiz && rm -rf skills-srcUse ~/.cursor/skills/ instead of .cursor/skills for a personal install.
Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/
Install the "second-brain-quiz" agent skill from https://github.com/undefined-ui/second-brain-os/tree/main/skills/second-brain-quiz into .cursor/skills/second-brain-quiz/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "second-brain-quiz", then confirm the skill loads.Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gemini skills install https://github.com/undefined-ui/second-brain-os.git --path skills/second-brain-quiz--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.
$ npx skills add undefined-ui/second-brain-os --skill second-brain-quiz -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install undefined-ui/second-brain-os second-brain-quiz --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/undefined-ui/second-brain-os.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/skills/second-brain-quiz .gemini/skills/second-brain-quiz && rm -rf skills-srcUse ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.
Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/
Install the "second-brain-quiz" agent skill from https://github.com/undefined-ui/second-brain-os/tree/main/skills/second-brain-quiz into .gemini/skills/second-brain-quiz/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "second-brain-quiz", then confirm the skill loads.Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gh skill install undefined-ui/second-brain-os second-brain-quizInstalls for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).
$ npx skills add undefined-ui/second-brain-os --skill second-brain-quiz -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/undefined-ui/second-brain-os.git skills-src && mkdir -p .github/skills && cp -r skills-src/skills/second-brain-quiz .github/skills/second-brain-quiz && rm -rf skills-srcUse ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.
GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/
Install the "second-brain-quiz" agent skill from https://github.com/undefined-ui/second-brain-os/tree/main/skills/second-brain-quiz into .github/skills/second-brain-quiz/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "second-brain-quiz", then confirm the skill loads.GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add undefined-ui/second-brain-os --skill second-brain-quiz -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install undefined-ui/second-brain-os second-brain-quiz --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/undefined-ui/second-brain-os.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/skills/second-brain-quiz .opencode/skills/second-brain-quiz && rm -rf skills-srcUse ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.
OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/
Install the "second-brain-quiz" agent skill from https://github.com/undefined-ui/second-brain-os/tree/main/skills/second-brain-quiz into .opencode/skills/second-brain-quiz/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "second-brain-quiz", then confirm the skill loads.OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
Facts
- Skill name
second-brain-quiz- GitHub stars
- 1k
- Token cost
- ~443 tokens
- SKILL.md length
- 184 words
- Files
- 1
- Skills in repo
- 23
- Repo updated
- First seen
- Licence
- MIT
At a glance
Generate questions from the user's own concept pages so they can find out what they saved but never learned, and compare their answers against what the pages say.
- Works in 5 steps: Pick the scope: a topic, a cluster, or… → Write questions of two kinds: recall of… → Withhold answers until the user has… → …
- The user wants to test themselves
- SKILL.md covers Core rule, Workflow, Output format and Calibration
- Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
What it does
Second Brain Quiz is an agent skill from undefined-ui/second-brain-os. Generate questions from the user's own concept pages so they can find out what they saved but never learned, and compare their answers against what the pages say. Use this skill when the user wants to test themselves, revise, make flashcards from their notes, or asks what they have forgotten. Do NOT use for generic quizzing on a topic the vault does not cover, or for answering a question from the vault.
Its SKILL.md is about 440 tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.
It sits in Education, covering Second brain and Study guides and flashcards. The repository describes itself as: An AI second brain that maintains itself. Full guide, starter vault, agent skills and scripts for a self-organizing knowledge base in Claude Code and Obsidian. The licence is MIT.
When your agent uses it
- The user wants to test themselves
- Make flashcards from their notes
- Asks what they have forgotten
- Generic quizzing on a topic the vault does not cover
Example prompts
- “/second-brain-quiz”
Workflow steps
5 steps, taken from the first numbered list in SKILL.md.
- Pick the scope: a topic, a cluster, or pages updated recently.
- Write questions of two kinds: recall of what the page states, and
- Withhold answers until the user has attempted them.
- Grade against the page, not against what is true. If they answered
- Report the gaps: which pages they could not answer from. Those are things
What it can do on your machine
Read from SKILL.md and the folder at commit c7fa35b. It shows what the files ask for, not the result of running them.
Tool permissions
Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.
From allowed-tools in the SKILL.md frontmatter.
Runs code
No scripts in the folder and no shell commands in SKILL.md.
From the folder's file list and the shell code blocks in SKILL.md.
Network
No URLs in SKILL.md.
From URLs in SKILL.md, links to its own repository left out.
Credentials
Names no API keys, tokens, secrets or passwords.
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.
Context cost
Second Brain Quiz loads about 443 tokens when it runs. Until then it costs about 106 tokens; SKILL.md has 184 words of instructions outside code blocks.
Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.
Safety
Auto-check passed
The automated check found no risky patterns in SKILL.md.
Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.
SKILL.md
The full file from undefined-ui/second-brain-os at commit c7fa35b, republished under its MIT licence (© undefined-ui). 184 words, ~443 tokens.
Download SKILL.mdSave it as
.claude/skills/second-brain-quiz/SKILL.md (or your agent's skills folder).- name
- second-brain-quiz
- description
- Generate questions from the user's own concept pages so they can find out what they saved but never learned, and compare their answers against what the pages say. Use this skill when the user wants to test themselves, revise, make flashcards from their notes, or asks what they have forgotten. Do NOT use for generic quizzing on a topic the vault does not cover, or for answering a question from the vault.
Quiz from your own pages
Reading something is not learning it. A vault of well-written pages nobody revisits is a library, and libraries do not make anyone knowledgeable.
Core rule
Questions come from the user's pages, at the depth those pages record. Never from general knowledge about the topic.
Workflow
- Pick the scope: a topic, a cluster, or pages updated recently.
- Write questions of two kinds: recall of what the page states, and application of the idea to a new case.
- Withhold answers until the user has attempted them.
- Grade against the page, not against what is true. If they answered correctly but the page says otherwise, that is a page problem worth surfacing.
- Report the gaps: which pages they could not answer from. Those are things saved and never learned.
Output format
<n> questions from <n> pages
1. <question>
...
[after answers]
Solid: <topics>
Shaky: <topics, with the pages to reread>
Page problems found: <pages that are unclear or wrong>Calibration
Keep it to a handful of pages that matter. Quizzing everything ever saved is a job, not a habit.
A page that cannot generate a good application question is usually a page that records the source's wording rather than an understanding of it. Say so.
© undefined-ui, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file
Files
Just SKILL.md in skills/second-brain-quiz of undefined-ui/second-brain-os.
Open the folder on GitHubat commit c7fa35b
Compare with similar skills
Second Brain Quiz next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.
| Skill | Stars | Used in | Tokens | Auto-check | Licence | Repo updated |
|---|---|---|---|---|---|---|
| Second Brain Quiz this skillundefined-ui/second-brain-os | 1k | — | ~443 | Automated safety check: Pass | MIT | |
| Obsidian StudyVault Builderbevibing/tutor-skills | 1.3k | — | ~1.9k | Automated safety check: Notes | MIT | |
| StudyVault Quiz Tutorbevibing/tutor-skills | 1.3k | — | ~1.4k | Automated safety check: Pass | MIT | |
| Project Mastery Coachtudoumashu/ai-memory-skillpack | 422 | — | ~1.8k | Automated safety check: Pass | MIT | |
| Read Bookcoreyhaines31/makerskills | 848 | — | ~2.1k | Automated safety check: Pass | MIT | |
| Deep Reading Analystginobefun/deep-reading-analyst-skill | 353 | 5 repos | ~3.6k | Automated safety check: Pass | MIT |
Similar skills
StudyVault Quiz Tutor
bevibing/tutor-skills
Quizzes you on the notes in an Obsidian StudyVault, tracks proficiency per concept and drills weak areas in four-question rounds.
Project Mastery Coach
tudoumashu/ai-memory-skillpack
Train strict project ownership from repo-local docs/ai memory and central LLM Wiki project entities.
Read Book
coreyhaines31/makerskills
When you want to read and extract structured notes from a book — PDF, EPUB, MOBI, markdown, .txt, pasted text, or URL to a public-domain work.
Deep Reading Analyst
ginobefun/deep-reading-analyst-skill
Comprehensive framework for deep analysis of articles, papers, and long-form content using 10+ thinking models (SCQA, 5W2H, critical thinking, inversion, mental models, first principles, systems…
Nihaisha
JuneYaooo/nihaisha-nishi-tcm
A skill your agent uses when the user asks about Ni Haisha / 倪海厦 TCM course material, especially Shang Han Lun / 伤寒论, Jingui / 金匮要略, Zhongjing Xinfa / 仲景心法, clinical cases / 临床案例 / 倪师医案, Bagang…
More from undefined-ui/second-brain-os
All 23 skills in this repoGoal Test
undefined-ui/second-brain-os
Turn a vague task into a testable definition of done and generate an executable goal-test script for it, optionally with a bounded retry loop around a headless agent.
Context Audit
undefined-ui/second-brain-os
Audit an agent's context layout against the four places: system prompt, tools, history, tail.
Evals Bootstrap
undefined-ui/second-brain-os
Scaffold a first eval suite for an agent: mine real failures into cases, write behavioural checks over traces, and generate the runner.
Gate Check
undefined-ui/second-brain-os
Find the decisions in a pipeline that do not need the expensive model and propose the gate for each: a rule, a classic classifier, or a small model, with fail-closed routing.
Harness Audit
undefined-ui/second-brain-os
Audit an agent's harness against the four rings: containment, guides, sensors, permissions.
Second Brain Chat Import
undefined-ui/second-brain-os
Triage an exported chat history into what to ingest, what to archive and what to delete, with a privacy pass first.
Related
Categories
Questions about Second Brain Quiz
What does Second Brain Quiz do?
Generate questions from the user's own concept pages so they can find out what they saved but never learned, and compare their answers against what the pages say. Second Brain Quiz is an agent skill from undefined-ui/second-brain-os. Generate questions from the user's own concept pages so they can find out what they saved but never learned, and compare their answers against what the pages say.
When should I use Second Brain Quiz?
Second Brain Quiz fits situations like: the user wants to test themselves; make flashcards from their notes; asks what they have forgotten; generic quizzing on a topic the vault does not cover.
How do I install Second Brain Quiz in Claude Code?
Run `npx skills add undefined-ui/second-brain-os --skill second-brain-quiz -a claude-code`. Or copy the skill folder (skills/second-brain-quiz in undefined-ui/second-brain-os) into .claude/skills/second-brain-quiz in your project. Claude Code loads it when a task matches its description.
How do I install Second Brain Quiz in Codex?
Run `npx skills add undefined-ui/second-brain-os --skill second-brain-quiz -a codex`. Or copy the skill folder (skills/second-brain-quiz in undefined-ui/second-brain-os) into .agents/skills/second-brain-quiz in your project. Codex loads it when a task matches its description.
Can I use Second Brain Quiz in Cursor, Gemini CLI or GitHub Copilot?
Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add undefined-ui/second-brain-os --skill second-brain-quiz -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/second-brain-quiz, .gemini/skills/second-brain-quiz, .github/skills/second-brain-quiz and .opencode/skills/second-brain-quiz in your project.
What does Second Brain Quiz need to run?
SKILL.md names no scripts, command-line tools or credentials: Second Brain Quiz is instructions for the agent only.
Does Second Brain Quiz access the network?
SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.
Is Second Brain Quiz safe to install?
Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.
What licence does Second Brain Quiz use?
Second Brain Quiz is published under the MIT licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.
How many tokens does Second Brain Quiz use?
About 443 tokens (SKILL.md is roughly 1.8k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.
What are the alternatives to Second Brain Quiz?
Skills that share tags, products or a category with Second Brain Quiz: Obsidian StudyVault Builder (bevibing/tutor-skills, 1.3k stars), StudyVault Quiz Tutor (bevibing/tutor-skills, 1.3k stars), Project Mastery Coach (tudoumashu/ai-memory-skillpack, 422 stars) and Read Book (coreyhaines31/makerskills, 848 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Second Brain Quiz?
undefined-ui (a GitHub user) maintains it in undefined-ui/second-brain-os, which has 1,009 GitHub stars. The repository holds 23 skills in this directory. The repository was last updated on October 7, 2026.
Source: undefined-ui/second-brain-os on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.