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Agent skill

Second Brain Report

by undefined-ui in undefined-ui/second-brain-os

Produce a research report from the vault: scope the question against existing pages, name the gaps, and write findings with citations, disagreements and limits.

MITAuto-check passedKnowledge Management

Install Second Brain Report

skills CLI
$ npx skills add undefined-ui/second-brain-os --skill second-brain-report -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI
$ gh skill install undefined-ui/second-brain-os second-brain-report --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy
$ 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-report .claude/skills/second-brain-report && rm -rf skills-src

Use ~/.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/

Facts

Skill name
second-brain-report
GitHub stars
1k
Token cost
~474 tokens
SKILL.md length
206 words
Files
1
Skills in repo
23
Repo updated
First seen
Licence
MIT

At a glance

Produce a research report from the vault: scope the question against existing pages, name the gaps, and write findings with citations, disagreements and limits.

  • Works in 6 steps: Inventory what exists. Which pages cover… → Report the gaps before writing, so the… → Write from pages, citing pages. Every… → …
  • The user asks for a research report
  • 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 Report is an agent skill from undefined-ui/second-brain-os. Produce a research report from the vault: scope the question against existing pages, name the gaps, and write findings with citations, disagreements and limits. Use this skill when the user asks for a research report, a deep write-up on a topic, or wants to understand a subject thoroughly using what they have collected. Do NOT use for a quick answer from the vault, for drafting an article in the user's voice, or for summarising a single source.

Its SKILL.md is about 470 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 Knowledge Management, covering Second brain, Deep research and Citation management. 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 asks for a research report
  • A deep write-up on a topic
  • Wants to understand a subject thoroughly using what they have collected
  • A quick answer from the vault

Example prompts

  • “/second-brain-report”

Workflow steps

6 steps, taken from the first numbered list in SKILL.md.

  1. Inventory what exists. Which pages cover this, what is thin, what is
  2. Report the gaps before writing, so the user can decide whether to ingest
  3. Write from pages, citing pages. Every claim traces to a source page with
  4. Record disagreement where sources conflict, with dates and who says what.
  5. State what could not be established and what evidence would change the
  6. Save to output/ and offer to ingest it back as a source.

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 Report loads about 474 tokens when it runs. Until then it costs about 117 tokens; SKILL.md has 206 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~117
When it runs · the whole SKILL.md, loaded when a task matches
~474

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). 206 words, ~474 tokens.

Download SKILL.mdSave it as .claude/skills/second-brain-report/SKILL.md (or your agent's skills folder).
name
second-brain-report
description
Produce a research report from the vault: scope the question against existing pages, name the gaps, and write findings with citations, disagreements and limits. Use this skill when the user asks for a research report, a deep write-up on a topic, or wants to understand a subject thoroughly using what they have collected. Do NOT use for a quick answer from the vault, for drafting an article in the user's voice, or for summarising a single source.

Write a research report

A report that presents only findings looks stronger and is less useful, because the reader cannot tell where it is load-bearing and where it is thin.

Core rule

Scope against the vault first. Most of the work in a good report is knowing what you do not need to look up.

Workflow

  1. Inventory what exists. Which pages cover this, what is thin, what is missing entirely. That answer is the research plan.
  2. Report the gaps before writing, so the user can decide whether to ingest more first.
  3. Write from pages, citing pages. Every claim traces to a source page with a URL behind it.
  4. Record disagreement where sources conflict, with dates and who says what.
  5. State what could not be established and what evidence would change the conclusion.
  6. Save to output/ and offer to ingest it back as a source.

Output format

## Question
## What the vault covers    (with [[page]] citations)
## Where sources disagree
## What I could not establish
## What would change this
## Pages read: <list>

Calibration

If the vault covers less than half the question, say so at the top rather than producing a report that reads as complete.

Never fill a gap from general knowledge without labelling it as outside the vault. A report whose sources cannot be checked is worth less than a short one that can.

© 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-report of undefined-ui/second-brain-os.

Open the folder on GitHubat commit c7fa35b

Compare with similar skills

Second Brain Report 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.

Second Brain Report compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Second Brain Report this skillundefined-ui/second-brain-os1k—~474Automated safety check: PassMIT
Karpathy WikiSherwinQ/karpathy-wiki113—~967Automated safety check: PassMIT
Bounded AutoresearchAgriciDaniel/claude-obsidian15k1 repos~1.6kAutomated safety check: PassMIT
Source Grounded Research ReportNeuroAIHub/BrainPilot1.1k—~503Automated safety check: PassAGPL-3.0
Live Researchbrightdata/skills264—~1.8kAutomated safety check: PassMIT
Khoj Research Guidewentorai/research-plugins2981 repos~1.9kAutomated safety check: PassMIT

Similar skills

  • Karpathy Wiki

    SherwinQ/karpathy-wiki

    A skill your agent uses when building or maintaining a personal knowledge base with LLM assistance.

    113 GitHub stars~967 tokensUpdated 5 mo ago
    Knowledge ManagementAuto-check passed

  • Bounded Autoresearch

    AgriciDaniel/claude-obsidian

    Runs a bounded, source-grounded research loop that drafts a cited dossier and can propose a separately reviewed merge into an Obsidian vault.

    15k GitHub starsUsed in 1 repo~1.6k tokens
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  • Source Grounded Research Report

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    Research a bounded factual, documentation, API, or literature question from authoritative sources and save a self-contained Markdown report with claim-level citations.

    1.1k GitHub stars~503 tokensUpdated 5 days ago
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  • Live Research

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    Produce a deep, multi-source, cited research brief on a topic from live web data using Bright Data's Discover API (intent-ranked web search + parsed page content).

    264 GitHub stars~1.8k tokensUpdated today
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  • Khoj Research Guide

    wentorai/research-plugins

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  • Deep Research Workflow

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    Runs multi-round research in three stages with a persisted state file, evidence tracking and a long-form report with per-claim citations.

    7.1k GitHub stars~1.3k tokensUpdated 3 days ago
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More from undefined-ui/second-brain-os

All 23 skills in this repo

  • Goal 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.

    1k GitHub starsUsed in 1 repo~754 tokens
    Auto-check passed

  • Context Audit

    undefined-ui/second-brain-os

    Audit an agent's context layout against the four places: system prompt, tools, history, tail.

    1k GitHub stars~802 tokensUpdated today
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  • 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.

    1k GitHub stars~786 tokensUpdated today
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  • 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.

    1k GitHub stars~854 tokensUpdated today
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  • Harness Audit

    undefined-ui/second-brain-os

    Audit an agent's harness against the four rings: containment, guides, sensors, permissions.

    1k GitHub stars~855 tokensUpdated today
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  • 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.

    1k GitHub stars~527 tokensUpdated today
    Auto-check passed

Categories

Questions about Second Brain Report

What does Second Brain Report do?

Produce a research report from the vault: scope the question against existing pages, name the gaps, and write findings with citations, disagreements and limits. Second Brain Report is an agent skill from undefined-ui/second-brain-os. Produce a research report from the vault: scope the question against existing pages, name the gaps, and write findings with citations, disagreements and limits.

When should I use Second Brain Report?

Second Brain Report fits situations like: the user asks for a research report; A deep write-up on a topic; wants to understand a subject thoroughly using what they have collected; A quick answer from the vault.

How do I install Second Brain Report in Claude Code?

Run `npx skills add undefined-ui/second-brain-os --skill second-brain-report -a claude-code`. Or copy the skill folder (skills/second-brain-report in undefined-ui/second-brain-os) into .claude/skills/second-brain-report in your project. Claude Code loads it when a task matches its description.

How do I install Second Brain Report in Codex?

Run `npx skills add undefined-ui/second-brain-os --skill second-brain-report -a codex`. Or copy the skill folder (skills/second-brain-report in undefined-ui/second-brain-os) into .agents/skills/second-brain-report in your project. Codex loads it when a task matches its description.

Can I use Second Brain Report 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-report -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-report, .gemini/skills/second-brain-report, .github/skills/second-brain-report and .opencode/skills/second-brain-report in your project.

What does Second Brain Report need to run?

SKILL.md names no scripts, command-line tools or credentials: Second Brain Report is instructions for the agent only.

Does Second Brain Report 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 Report 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 Report use?

Second Brain Report 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 Report use?

About 474 tokens (SKILL.md is roughly 1.9k 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 Report?

Skills that share tags, products or a category with Second Brain Report: Karpathy Wiki (SherwinQ/karpathy-wiki, 113 stars), Bounded Autoresearch (AgriciDaniel/claude-obsidian, 15k stars), Source Grounded Research Report (NeuroAIHub/BrainPilot, 1.1k stars) and Live Research (brightdata/skills, 264 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Second Brain Report?

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.