Simple History Voice
bonny/WordPress-Simple-History
Pär's writing voice and per-text-type rules for Simple History, on top of the humanizer skill.
Draft from the vault: outline from concept pages, keep citations to the user's own sources, and surface where their material disagrees.
Install Second Brain Write
$ npx skills add undefined-ui/second-brain-os --skill second-brain-write -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install undefined-ui/second-brain-os second-brain-write --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-write .claude/skills/second-brain-write && 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-write" agent skill from https://github.com/undefined-ui/second-brain-os/tree/main/skills/second-brain-write into .claude/skills/second-brain-write/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "second-brain-write", 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-writeType 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-write -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install undefined-ui/second-brain-os second-brain-write --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-write .agents/skills/second-brain-write && 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-write" agent skill from https://github.com/undefined-ui/second-brain-os/tree/main/skills/second-brain-write into .agents/skills/second-brain-write/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "second-brain-write", 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-write -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install undefined-ui/second-brain-os second-brain-write --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-write .cursor/skills/second-brain-write && 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-write" agent skill from https://github.com/undefined-ui/second-brain-os/tree/main/skills/second-brain-write into .cursor/skills/second-brain-write/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "second-brain-write", 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-write--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-write -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install undefined-ui/second-brain-os second-brain-write --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-write .gemini/skills/second-brain-write && 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-write" agent skill from https://github.com/undefined-ui/second-brain-os/tree/main/skills/second-brain-write into .gemini/skills/second-brain-write/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "second-brain-write", 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-writeInstalls 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-write -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-write .github/skills/second-brain-write && 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-write" agent skill from https://github.com/undefined-ui/second-brain-os/tree/main/skills/second-brain-write into .github/skills/second-brain-write/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "second-brain-write", 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-write -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-write --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-write .opencode/skills/second-brain-write && 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-write" agent skill from https://github.com/undefined-ui/second-brain-os/tree/main/skills/second-brain-write into .opencode/skills/second-brain-write/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "second-brain-write", 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-write- GitHub stars
- 999
- Token cost
- ~480 tokens
- SKILL.md length
- 214 words
- Files
- 1
- Skills in repo
- 23
- Repo updated
- First seen
- Licence
- MIT
At a glance
Draft from the vault: outline from concept pages, keep citations to the user's own sources, and surface where their material disagrees.
- Works in 6 steps: Find the relevant concept pages and say… → Surface the disagreements. These are… → Build the outline from pages, each point… → …
- The user wants to write an article
- 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 Write is an agent skill from undefined-ui/second-brain-os. Draft from the vault: outline from concept pages, keep citations to the user's own sources, and surface where their material disagrees. Use this skill when the user wants to write an article, post, essay or newsletter based on what they have collected, or asks what they could write about a topic. Do NOT use for research reports, for writing with no grounding in the vault, or for editing text the user wrote themselves unless asked.
Its SKILL.md is about 480 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, Copy editing and proofreading and Blog and article writing. 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 write an article
- Newsletter based on what they have collected
- Asks what they could write about a topic
- Research reports
Example prompts
- “/second-brain-write”
Workflow steps
6 steps, taken from the first numbered list in SKILL.md.
- Find the relevant concept pages and say what they collectively argue.
- Surface the disagreements. These are where the user has something to say
- Build the outline from pages, each point tied to the page behind it.
- Mark the weak points: claims resting on one source, self-reported
- Draft only if asked, and say plainly that the phrasing is a first pass to
- Offer to ingest the finished piece back as a source once published.
What it can do on your machine
Read from SKILL.md and the folder at commit d6861cc. 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 Write loads about 480 tokens when it runs. Until then it costs about 113 tokens; SKILL.md has 214 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 d6861cc, republished under its MIT licence (© undefined-ui). 214 words, ~480 tokens.
Download SKILL.mdSave it as
.claude/skills/second-brain-write/SKILL.md (or your agent's skills folder).- name
- second-brain-write
- description
- Draft from the vault: outline from concept pages, keep citations to the user's own sources, and surface where their material disagrees. Use this skill when the user wants to write an article, post, essay or newsletter based on what they have collected, or asks what they could write about a topic. Do NOT use for research reports, for writing with no grounding in the vault, or for editing text the user wrote themselves unless asked.
Write from the vault
The research is already done, cited and connected. What is left is the argument, and that is the part the user should keep.
Core rule
Assemble structure and evidence. Do not hand back finished prose as if it were theirs.
Workflow
- Find the relevant concept pages and say what they collectively argue.
- Surface the disagreements. These are where the user has something to say that is not the consensus view, and they are the most useful part of the outline.
- Build the outline from pages, each point tied to the page behind it.
- Mark the weak points: claims resting on one source, self-reported figures, anything the vault flags as unverified.
- Draft only if asked, and say plainly that the phrasing is a first pass to be rewritten in their voice.
- Offer to ingest the finished piece back as a source once published.
Output format
Angle: <what this piece argues that the sources do not individually>
Outline:
1. <point> - [[page]], [[page]]
Weak points: <claims with thin support>
Missing: <what would strengthen it>Calibration
If every point in the outline comes from one page, this is a summary of that page, not an article. Say so.
Never introduce a specific number or quote that has no source page behind it. That is the failure mode of writing with a model, and in a cited piece it is the one that costs the most.
© 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-write of undefined-ui/second-brain-os.
Open the folder on GitHubat commit d6861cc
Compare with similar skills
Second Brain Write 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 Write this skillundefined-ui/second-brain-os | 999 | — | ~480 | Automated safety check: Pass | MIT | |
| Simple History Voicebonny/WordPress-Simple-History | 317 | — | ~775 | Automated safety check: Pass | None | |
| Personal Chinese Writing Stylesugarforever/01coder-agent-skills | 136 | — | ~744 | Automated safety check: Pass | MIT | |
| Content Workflowthatrebeccarae/claude-marketing | 162 | — | ~1k | Automated safety check: Pass | MIT | |
| Karpathy WikiSherwinQ/karpathy-wiki | 113 | — | ~967 | Automated safety check: Pass | MIT | |
| Bounded AutoresearchAgriciDaniel/claude-obsidian | 15k | — | ~1.6k | Automated safety check: Pass | MIT |
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Content Workflow
thatrebeccarae/claude-marketing
End-to-end content creation pipeline from research through editorial review to social distribution.
Karpathy Wiki
SherwinQ/karpathy-wiki
A skill your agent uses when building or maintaining a personal knowledge base with LLM assistance.
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.
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Related
Categories
Questions about Second Brain Write
What does Second Brain Write do?
Draft from the vault: outline from concept pages, keep citations to the user's own sources, and surface where their material disagrees. Second Brain Write is an agent skill from undefined-ui/second-brain-os. Draft from the vault: outline from concept pages, keep citations to the user's own sources, and surface where their material disagrees.
When should I use Second Brain Write?
Second Brain Write fits situations like: the user wants to write an article; newsletter based on what they have collected; asks what they could write about a topic; research reports.
How do I install Second Brain Write in Claude Code?
Run `npx skills add undefined-ui/second-brain-os --skill second-brain-write -a claude-code`. Or copy the skill folder (skills/second-brain-write in undefined-ui/second-brain-os) into .claude/skills/second-brain-write in your project. Claude Code loads it when a task matches its description.
How do I install Second Brain Write in Codex?
Run `npx skills add undefined-ui/second-brain-os --skill second-brain-write -a codex`. Or copy the skill folder (skills/second-brain-write in undefined-ui/second-brain-os) into .agents/skills/second-brain-write in your project. Codex loads it when a task matches its description.
Can I use Second Brain Write 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-write -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-write, .gemini/skills/second-brain-write, .github/skills/second-brain-write and .opencode/skills/second-brain-write in your project.
What does Second Brain Write need to run?
SKILL.md names no scripts, command-line tools or credentials: Second Brain Write is instructions for the agent only.
Does Second Brain Write 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 Write 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 Write use?
Second Brain Write 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 Write use?
About 480 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 Write?
Skills that share tags, products or a category with Second Brain Write: Simple History Voice (bonny/WordPress-Simple-History, 317 stars), Personal Chinese Writing Style (sugarforever/01coder-agent-skills, 136 stars), Content Workflow (thatrebeccarae/claude-marketing, 162 stars) and Karpathy Wiki (SherwinQ/karpathy-wiki, 113 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Second Brain Write?
undefined-ui (a GitHub user) maintains it in undefined-ui/second-brain-os, which has 999 GitHub stars. The repository holds 23 skills in this directory. The repository was last updated on September 29, 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.