Luhmann Note Numberer
twhsi/skills
Assigns and checks Luhmann-style codes for book manuscript notes and Obsidian card folders without renumbering existing notes.
Import a webpage by URL into raw/web/. An agent skill from PieroSierra/SecondBrain.
Install Second Brain Import Web
$ npx skills add PieroSierra/SecondBrain --skill second-brain-import-web -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install PieroSierra/SecondBrain second-brain-import-web --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/PieroSierra/SecondBrain.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.claude/skills/second-brain-import-web .claude/skills/second-brain-import-web && 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-import-web" agent skill from https://github.com/PieroSierra/SecondBrain/tree/main/.claude/skills/second-brain-import-web into .claude/skills/second-brain-import-web/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "second-brain-import-web", 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/PieroSierra/SecondBrain/tree/main/.claude/skills/second-brain-import-webType 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 PieroSierra/SecondBrain --skill second-brain-import-web -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install PieroSierra/SecondBrain second-brain-import-web --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/PieroSierra/SecondBrain.git skills-src && mkdir -p .agents/skills && cp -r skills-src/.claude/skills/second-brain-import-web .agents/skills/second-brain-import-web && 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-import-web" agent skill from https://github.com/PieroSierra/SecondBrain/tree/main/.claude/skills/second-brain-import-web into .agents/skills/second-brain-import-web/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "second-brain-import-web", 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 PieroSierra/SecondBrain --skill second-brain-import-web -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install PieroSierra/SecondBrain second-brain-import-web --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/PieroSierra/SecondBrain.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/.claude/skills/second-brain-import-web .cursor/skills/second-brain-import-web && 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-import-web" agent skill from https://github.com/PieroSierra/SecondBrain/tree/main/.claude/skills/second-brain-import-web into .cursor/skills/second-brain-import-web/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "second-brain-import-web", 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/PieroSierra/SecondBrain.git --path .claude/skills/second-brain-import-web--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 PieroSierra/SecondBrain --skill second-brain-import-web -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install PieroSierra/SecondBrain second-brain-import-web --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/PieroSierra/SecondBrain.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/.claude/skills/second-brain-import-web .gemini/skills/second-brain-import-web && 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-import-web" agent skill from https://github.com/PieroSierra/SecondBrain/tree/main/.claude/skills/second-brain-import-web into .gemini/skills/second-brain-import-web/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "second-brain-import-web", 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 PieroSierra/SecondBrain second-brain-import-webInstalls 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 PieroSierra/SecondBrain --skill second-brain-import-web -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/PieroSierra/SecondBrain.git skills-src && mkdir -p .github/skills && cp -r skills-src/.claude/skills/second-brain-import-web .github/skills/second-brain-import-web && 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-import-web" agent skill from https://github.com/PieroSierra/SecondBrain/tree/main/.claude/skills/second-brain-import-web into .github/skills/second-brain-import-web/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "second-brain-import-web", 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 PieroSierra/SecondBrain --skill second-brain-import-web -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install PieroSierra/SecondBrain second-brain-import-web --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/PieroSierra/SecondBrain.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/.claude/skills/second-brain-import-web .opencode/skills/second-brain-import-web && 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-import-web" agent skill from https://github.com/PieroSierra/SecondBrain/tree/main/.claude/skills/second-brain-import-web into .opencode/skills/second-brain-import-web/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "second-brain-import-web", 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-import-web- GitHub stars
- 153
- Token cost
- ~3k tokens
- SKILL.md length
- 1,254 words
- Files
- 1
- Skills in repo
- 15
- Repo updated
- First seen
- Licence
- None found
At a glance
Import a webpage by URL into raw/web/. An agent skill from PieroSierra/SecondBrain.
- Works in 8 steps: Parse arguments → Fetch (skipped in paste-fallback mode) → Detect paywall or unfetchable → …
- Tasks that involve Second brain
- SKILL.md covers Invocation, Execution, Invariants and Error Conditions
- Reaches nyt.com
What it does
Second Brain Import Web is an agent skill from PieroSierra/SecondBrain. Import a webpage by URL into raw/web/. Fetches with WebFetch, converts to clean Markdown, stores with provenance. Falls back to a paste-Markdown mode for paywalled or unfetchable pages.
Its SKILL.md is about 3k 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 and Markdown. The repository describes itself as: A personal knowledge base that lives in this folder. Drop content in, have it organized automatically, ask questions, and get sourced answers — either through Claude Code slash…
When your agent uses it
- Tasks that involve Second brain
- Tasks that involve Markdown
Example prompts
- “/second-brain-import-web”
Workflow steps
8 steps, taken from the step headings in SKILL.md.
- Parse arguments
- Fetch (skipped in paste-fallback mode)
- Detect paywall or unfetchable
- Detect title, published date, author
- Generate slug and output path
- Check for existing file
- Write the file
- Confirm (success)
What it can do on your machine
Read from SKILL.md and the folder at commit cdcf96f. 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 (its code samples are markdown).
From the folder's file list and the shell code blocks in SKILL.md.
Network
Hosts in commands or code, which the agent is likely to contact:
nyt.com
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 Import Web loads about 3k tokens when it runs. Until then it costs about 52 tokens; SKILL.md has 1,254 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
Without a licence we can't republish the file, so here is its outline and opening line. It has 1,254 words (~2,952 tokens).
“Import a webpage from a URL into raw/web/ as a clean Markdown file. The skill fetches the page with the built-in WebFetch tool and extracts the readable article body, preserving the original URL as provenance. When a page is paywalled…”
- name
- second-brain-import-web
- argument-hint
- <url> [--pasted-markdown <body>] [--context <text>]
- user-invocable
- true
Files
Just SKILL.md in .claude/skills/second-brain-import-web of PieroSierra/SecondBrain.
Open the folder on GitHubat commit cdcf96f
Compare with similar skills
Second Brain Import Web 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 Import Web this skillPieroSierra/SecondBrain | 153 | — | ~3k | Automated safety check: Pass | None | |
| Luhmann Note Numberertwhsi/skills | 259 | — | ~1.5k | Automated safety check: Pass | None | |
| Baoyu URL To Markdownsdyckjq-lab/llm-wiki-skill | 2.5k | 2 repos | ~3.2k | Automated safety check: Pass | None | |
| Obsidian Canvas BoardsAgriciDaniel/claude-obsidian | 15k | — | ~1.4k | Automated safety check: Pass | MIT | |
| 3D Brainnateherkai/AIS-OS | 1.6k | — | ~2.1k | Automated safety check: Pass | Custom licence | |
| Icm ArchitectRinDig/icm-architect | 1.8k | — | ~3.2k | Automated safety check: Pass | MIT |
Similar skills
Baoyu URL To Markdown
sdyckjq-lab/llm-wiki-skill
Fetch any URL and convert to markdown using Chrome CDP. An agent skill from sdyckjq-lab/llm-wiki-skill.
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.
3D Brain
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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.
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…
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Set up a new Obsidian knowledge base with the LLM Wiki pattern.
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Related
Categories
Questions about Second Brain Import Web
What does Second Brain Import Web do?
Import a webpage by URL into raw/web/. An agent skill from PieroSierra/SecondBrain. Second Brain Import Web is an agent skill from PieroSierra/SecondBrain. Import a webpage by URL into raw/web/.
When should I use Second Brain Import Web?
Second Brain Import Web fits situations like: tasks that involve Second brain; tasks that involve Markdown.
How do I install Second Brain Import Web in Claude Code?
Run `npx skills add PieroSierra/SecondBrain --skill second-brain-import-web -a claude-code`. Or copy the skill folder (.claude/skills/second-brain-import-web in PieroSierra/SecondBrain) into .claude/skills/second-brain-import-web in your project. Claude Code loads it when a task matches its description.
How do I install Second Brain Import Web in Codex?
Run `npx skills add PieroSierra/SecondBrain --skill second-brain-import-web -a codex`. Or copy the skill folder (.claude/skills/second-brain-import-web in PieroSierra/SecondBrain) into .agents/skills/second-brain-import-web in your project. Codex loads it when a task matches its description.
Can I use Second Brain Import Web 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 PieroSierra/SecondBrain --skill second-brain-import-web -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-import-web, .gemini/skills/second-brain-import-web, .github/skills/second-brain-import-web and .opencode/skills/second-brain-import-web in your project.
What does Second Brain Import Web need to run?
SKILL.md names no scripts, command-line tools or credentials: Second Brain Import Web is instructions for the agent only.
Does Second Brain Import Web access the network?
SKILL.md names 1 domain. In commands or code: nyt.com; the agent is likely to contact it when it follows the instructions. This is read from the text; nothing was executed.
Is Second Brain Import Web 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 Import Web use?
No licence was found for Second Brain Import Web or its repository. Without one, default copyright applies: ask the author before reusing or redistributing it.
How many tokens does Second Brain Import Web use?
About 3k tokens (SKILL.md is roughly 12k 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 Import Web?
Skills that share tags, products or a category with Second Brain Import Web: Luhmann Note Numberer (twhsi/skills, 259 stars), Baoyu URL To Markdown (sdyckjq-lab/llm-wiki-skill, 2.5k stars), Obsidian Canvas Boards (AgriciDaniel/claude-obsidian, 15k stars) and 3D Brain (nateherkai/AIS-OS, 1.6k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Second Brain Import Web?
PieroSierra (a GitHub user) maintains it in PieroSierra/SecondBrain, which has 153 GitHub stars. The repository holds 15 skills in this directory. The repository was last updated on October 5, 2026.
Source: PieroSierra/SecondBrain on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.