Second Brain
NicholasSpisak/second-brain
Set up a new Obsidian knowledge base with the LLM Wiki pattern.
Personal knowledge base powered by Ensue for capturing and retrieving understanding.
Install Second Brain
$ npx skills add sundial-org/awesome-openclaw-skills --skill second-brain -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install sundial-org/awesome-openclaw-skills second-brain --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/sundial-org/awesome-openclaw-skills.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/second-brain .claude/skills/second-brain && 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" agent skill from https://github.com/sundial-org/awesome-openclaw-skills/tree/main/skills/second-brain into .claude/skills/second-brain/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "second-brain", 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/sundial-org/awesome-openclaw-skills/tree/main/skills/second-brainType 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 sundial-org/awesome-openclaw-skills --skill second-brain -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install sundial-org/awesome-openclaw-skills second-brain --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/sundial-org/awesome-openclaw-skills.git skills-src && mkdir -p .agents/skills && cp -r skills-src/skills/second-brain .agents/skills/second-brain && 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" agent skill from https://github.com/sundial-org/awesome-openclaw-skills/tree/main/skills/second-brain into .agents/skills/second-brain/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "second-brain", 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 sundial-org/awesome-openclaw-skills --skill second-brain -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install sundial-org/awesome-openclaw-skills second-brain --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/sundial-org/awesome-openclaw-skills.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/skills/second-brain .cursor/skills/second-brain && 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" agent skill from https://github.com/sundial-org/awesome-openclaw-skills/tree/main/skills/second-brain into .cursor/skills/second-brain/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "second-brain", 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/sundial-org/awesome-openclaw-skills.git --path skills/second-brain--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 sundial-org/awesome-openclaw-skills --skill second-brain -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install sundial-org/awesome-openclaw-skills second-brain --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/sundial-org/awesome-openclaw-skills.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/skills/second-brain .gemini/skills/second-brain && 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" agent skill from https://github.com/sundial-org/awesome-openclaw-skills/tree/main/skills/second-brain into .gemini/skills/second-brain/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "second-brain", 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 sundial-org/awesome-openclaw-skills second-brainInstalls 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 sundial-org/awesome-openclaw-skills --skill second-brain -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/sundial-org/awesome-openclaw-skills.git skills-src && mkdir -p .github/skills && cp -r skills-src/skills/second-brain .github/skills/second-brain && 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" agent skill from https://github.com/sundial-org/awesome-openclaw-skills/tree/main/skills/second-brain into .github/skills/second-brain/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "second-brain", 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 sundial-org/awesome-openclaw-skills --skill second-brain -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install sundial-org/awesome-openclaw-skills second-brain --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/sundial-org/awesome-openclaw-skills.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/skills/second-brain .opencode/skills/second-brain && 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" agent skill from https://github.com/sundial-org/awesome-openclaw-skills/tree/main/skills/second-brain into .opencode/skills/second-brain/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "second-brain", 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- GitHub stars
- 663
- Token cost
- ~1.8k tokens
- SKILL.md length
- 407 words
- Files
- 2 (incl. scripts)
- Skills in repo
- 353
- Repo updated
- First seen
- Licence
- None found
At a glance
Personal knowledge base powered by Ensue for capturing and retrieving understanding.
- Works in 4 steps: "Want me to save this to your second… → Show draft of what will be saved → Save after confirmation → …
- User wants to save knowledge
- SKILL.md covers Philosophy, Namespace Structure, Content Formats and Interaction Rules, plus 6 more sections
- Runs Shell scripts from its folder; needs ENSUE_API_KEY
What it does
Second Brain is an agent skill from sundial-org/awesome-openclaw-skills. Personal knowledge base powered by Ensue for capturing and retrieving understanding. Use when user wants to save knowledge, recall what they know, manage their toolbox, or build on past learnings. Triggers on "save this", "remember", "what do I know about", "add to toolbox", "my notes on", "store this concept".
Its SKILL.md is about 1.8k tokens, which your agent loads only when the skill is triggered. The skill folder holds 2 other files, including scripts (for example `scripts/ensue-api.sh`).
It sits in Knowledge Management, covering Second brain. The repository describes itself as: Top OpenClaw skills, with the most popular and useful ones.
When your agent uses it
- User wants to save knowledge
- Recall what they know
- Manage their toolbox
- Build on past learnings
Example prompts
- “save this”
- “remember”
- “what do I know about”
- “/second-brain”
Requirements
- A Bash shell
- A credential in ENSUE_API_KEY
Workflow steps
4 steps, taken from the first numbered list in SKILL.md.
- "Want me to save this to your second brain?"
- Show draft of what will be saved
- Save after confirmation
- Confirm what was saved and where
What it can do on your machine
Read from SKILL.md and the folder at commit b80cde2. 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
Ships 1 file in scripts/ (Shell), which the agent can run.
From the folder's file list and the shell code blocks in SKILL.md.
Network
Links to these hosts (documentation or services it may open):
ensue-network.ai
From URLs in SKILL.md, links to its own repository left out.
Credentials
Names these keys or tokens, usually read from environment variables:
ENSUE_API_KEY
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.
Context cost
Second Brain loads about 1.8k tokens when it runs. Until then it costs about 81 tokens; SKILL.md has 407 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); the scripts in this folder are not scanned.
SKILL.md
Without a licence we can't republish the file, so here is its outline and opening line. It has 407 words (~1,760 tokens).
“A personal knowledge base for building understanding that compounds over time. Not a note dump - a structured system for capturing knowledge you can actually retrieve and use.”
- name
- second-brain
Files
SKILL.md and 1 other file (scripts) in skills/second-brain of sundial-org/awesome-openclaw-skills.
- SKILL.md
- scripts/ensue-api.sh
Open the folder on GitHubat commit b80cde2
Compare with similar skills
Second Brain 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 this skillsundial-org/awesome-openclaw-skills | 663 | — | ~1.8k | Automated safety check: Pass | None | |
| Second BrainNicholasSpisak/second-brain | 736 | 1 repos | ~1.5k | Automated safety check: Notes | None | |
| 3D Brainnateherkai/AIS-OS | 1.6k | — | ~2.1k | Automated safety check: Pass | Custom licence | |
| Obsidian Canvas BoardsAgriciDaniel/claude-obsidian | 15k | — | ~1.4k | Automated safety check: Pass | MIT | |
| Icm ArchitectRinDig/icm-architect | 1.8k | — | ~3.2k | Automated safety check: Pass | MIT | |
| Obsidian CLI Read TransportAgriciDaniel/claude-obsidian | 15k | 1 repos | ~762 | Automated safety check: Pass | MIT |
Similar skills
3D Brain
nateherkai/AIS-OS
A skill your agent uses when someone asks to build a 3D brain, visualize their AIOS or second brain, turn their knowledge into an interactive graph, or run /3d-brain or /3D brain.
Obsidian Canvas Boards
AgriciDaniel/claude-obsidian
Creates, inspects and updates Obsidian JSON Canvas boards in a vault, with text, file, link, group and edge nodes, using safe recoverable edits.
Icm Architect
RinDig/icm-architect
Design any process, idea, problem, or body of knowledge into an ICM (Interpretable Context Methodology) workspace — folder structure as agent architecture — or restructure an existing folder, repo…
Obsidian CLI Read Transport
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Detects and uses the official Obsidian command-line interface for read-only vault access, falling back to direct file reads, while all mutations stay on a separate transaction core.
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Categories
Questions about Second Brain
What does Second Brain do?
Personal knowledge base powered by Ensue for capturing and retrieving understanding. Second Brain is an agent skill from sundial-org/awesome-openclaw-skills. Personal knowledge base powered by Ensue for capturing and retrieving understanding.
When should I use Second Brain?
Second Brain fits situations like: user wants to save knowledge; recall what they know; manage their toolbox; build on past learnings.
How do I install Second Brain in Claude Code?
Run `npx skills add sundial-org/awesome-openclaw-skills --skill second-brain -a claude-code`. Or copy the skill folder (skills/second-brain in sundial-org/awesome-openclaw-skills) into .claude/skills/second-brain in your project. Claude Code loads it when a task matches its description.
How do I install Second Brain in Codex?
Run `npx skills add sundial-org/awesome-openclaw-skills --skill second-brain -a codex`. Or copy the skill folder (skills/second-brain in sundial-org/awesome-openclaw-skills) into .agents/skills/second-brain in your project. Codex loads it when a task matches its description.
Can I use Second Brain 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 sundial-org/awesome-openclaw-skills --skill second-brain -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, .gemini/skills/second-brain, .github/skills/second-brain and .opencode/skills/second-brain in your project.
What does Second Brain need to run?
Going by SKILL.md and its folder, Second Brain needs a shell for the scripts in its folder and credentials named ENSUE_API_KEY. Our summary lists: A Bash shell; A credential in ENSUE_API_KEY.
Does Second Brain access the network?
SKILL.md names 1 domain. As links in the text: ensue-network.ai. This is read from the text; nothing was executed.
Is Second Brain 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. The check reads SKILL.md only: the scripts in the folder are not scanned, so read them before running anything.
What licence does Second Brain use?
No licence was found for Second Brain or its repository. Without one, default copyright applies: ask the author before reusing or redistributing it.
How many tokens does Second Brain use?
About 1.8k tokens (SKILL.md is roughly 7k 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?
Skills that share tags, products or a category with Second Brain: Second Brain (NicholasSpisak/second-brain, 736 stars), 3D Brain (nateherkai/AIS-OS, 1.6k stars), Obsidian Canvas Boards (AgriciDaniel/claude-obsidian, 15k stars) and Icm Architect (RinDig/icm-architect, 1.8k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Second Brain?
sundial-org (a GitHub organization) maintains it in sundial-org/awesome-openclaw-skills, which has 663 GitHub stars. The repository holds 353 skills in this directory. The repository was last updated on March 7, 2026.
Source: sundial-org/awesome-openclaw-skills on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.