Agent skill

Markdown Toc

by huangruiteng in huangruiteng/CS-Notes

Extract a Markdown heading tree with line numbers before editing or integrating notes.

Install Markdown Toc

skills CLI

$ npx skills add huangruiteng/CS-Notes --skill markdown-toc -a claude-code

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

GitHub CLI

$ gh skill install huangruiteng/CS-Notes markdown-toc --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/huangruiteng/CS-Notes.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.codex/skills/markdown-toc .claude/skills/markdown-toc && 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/

Paste into Claude Code

Install the "markdown-toc" agent skill from https://github.com/huangruiteng/CS-Notes/tree/master/.codex/skills/markdown-toc into .claude/skills/markdown-toc/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "markdown-toc", 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

$skill-installer install https://github.com/huangruiteng/CS-Notes/tree/master/.codex/skills/markdown-toc

Type 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.

skills CLI

$ npx skills add huangruiteng/CS-Notes --skill markdown-toc -a codex

Project install goes to .agents/skills/; add -g for ~/.codex/skills/.

GitHub CLI

$ gh skill install huangruiteng/CS-Notes markdown-toc --agent codex

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/huangruiteng/CS-Notes.git skills-src && mkdir -p .agents/skills && cp -r skills-src/.codex/skills/markdown-toc .agents/skills/markdown-toc && rm -rf skills-src

Use ~/.agents/skills/ instead of .agents/skills for a personal install.

Codex skills documentation · loads skills from .agents/skills/

Paste into Codex

Install the "markdown-toc" agent skill from https://github.com/huangruiteng/CS-Notes/tree/master/.codex/skills/markdown-toc into .agents/skills/markdown-toc/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "markdown-toc", 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.

skills CLI

$ npx skills add huangruiteng/CS-Notes --skill markdown-toc -a cursor

Project install goes to .agents/skills/; add -g for ~/.cursor/skills/.

GitHub CLI

$ gh skill install huangruiteng/CS-Notes markdown-toc --agent cursor

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/huangruiteng/CS-Notes.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/.codex/skills/markdown-toc .cursor/skills/markdown-toc && rm -rf skills-src

Use ~/.cursor/skills/ instead of .cursor/skills for a personal install.

Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/

Paste into Cursor

Install the "markdown-toc" agent skill from https://github.com/huangruiteng/CS-Notes/tree/master/.codex/skills/markdown-toc into .cursor/skills/markdown-toc/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "markdown-toc", 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

$ gemini skills install https://github.com/huangruiteng/CS-Notes.git --path .codex/skills/markdown-toc

--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.

skills CLI

$ npx skills add huangruiteng/CS-Notes --skill markdown-toc -a gemini-cli

Project install goes to .agents/skills/; add -g for ~/.gemini/skills/.

GitHub CLI

$ gh skill install huangruiteng/CS-Notes markdown-toc --agent gemini-cli

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/huangruiteng/CS-Notes.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/.codex/skills/markdown-toc .gemini/skills/markdown-toc && rm -rf skills-src

Use ~/.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/

Paste into Gemini CLI

Install the "markdown-toc" agent skill from https://github.com/huangruiteng/CS-Notes/tree/master/.codex/skills/markdown-toc into .gemini/skills/markdown-toc/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "markdown-toc", 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.

GitHub CLI

$ gh skill install huangruiteng/CS-Notes markdown-toc

Installs 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).

skills CLI

$ npx skills add huangruiteng/CS-Notes --skill markdown-toc -a github-copilot

Project install goes to .agents/skills/; add -g for ~/.copilot/skills/.

Manual copy

$ git clone --depth 1 https://github.com/huangruiteng/CS-Notes.git skills-src && mkdir -p .github/skills && cp -r skills-src/.codex/skills/markdown-toc .github/skills/markdown-toc && rm -rf skills-src

Use ~/.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/

Paste into GitHub Copilot

Install the "markdown-toc" agent skill from https://github.com/huangruiteng/CS-Notes/tree/master/.codex/skills/markdown-toc into .github/skills/markdown-toc/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "markdown-toc", 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.

skills CLI

$ npx skills add huangruiteng/CS-Notes --skill markdown-toc -a opencode

OpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.

GitHub CLI

$ gh skill install huangruiteng/CS-Notes markdown-toc --agent opencode

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/huangruiteng/CS-Notes.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/.codex/skills/markdown-toc .opencode/skills/markdown-toc && rm -rf skills-src

Use ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.

OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/

Paste into OpenCode

Install the "markdown-toc" agent skill from https://github.com/huangruiteng/CS-Notes/tree/master/.codex/skills/markdown-toc into .opencode/skills/markdown-toc/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "markdown-toc", 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: markdown-toc
GitHub stars: 4k
Token cost: ~390 tokens
SKILL.md length: 147 words
Files: 3 (incl. scripts)
Skills in repo: 38
Repo updated: Oct 6, 2026
First seen: Oct 7, 2026
Licence: MIT

At a glance

Extract a Markdown heading tree with line numbers before editing or integrating notes.

Works in 5 steps: Run the TOC script on the candidate file. → Read the returned heading tree and line… → Open the most likely section… → …
You need to inspect a long Markdown file quickly and choose the best insertion point instead of editing blind
SKILL.md covers Use this skill when, Quick start, Workflow and Output format
Runs Python scripts from its folder; calls python3

What it does

Markdown Toc is an agent skill from huangruiteng/CS-Notes. Extract a Markdown heading tree with line numbers before editing or integrating notes. Use when you need to inspect a long Markdown file quickly and choose the best insertion point instead of editing blind.

Its SKILL.md is about 390 tokens, which your agent loads only when the skill is triggered. The skill folder holds 4 other files, including scripts (for example `agents/openai.yaml` and `scripts/extract_toc.py`).

It sits in Documents & Office, covering Markdown. The licence is MIT.

When your agent uses it

You need to inspect a long Markdown file quickly and choose the best insertion point instead of editing blind
Tasks that involve Markdown

Example prompts

“/markdown-toc”

Requirements

Python 3

Workflow steps

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

Run the TOC script on the candidate file.
Read the returned heading tree and line numbers.
Open the most likely section neighborhood with sed -n ',p' or nl -ba.
Insert into an existing section when possible.
Create a new section only when the file truly lacks a clean landing spot.

What it can do on your machine

Read from SKILL.md and the folder at commit d01d8f8. 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/ (Python), which the agent can run.
Shell commands in SKILL.md call:
- python3
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

Markdown Toc loads about 390 tokens when it runs. Until then it costs about 55 tokens; SKILL.md has 147 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it: ~55
When it runs · the whole SKILL.md, loaded when a task matches: ~390

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

The full file from huangruiteng/CS-Notes at commit d01d8f8, republished under its MIT licence (© huangruiteng). 147 words, ~390 tokens.

Download SKILL.mdSave it as .claude/skills/markdown-toc/SKILL.md (or your agent's skills folder). This skill also uses 2 other files; get the full folder from GitHub.

name: markdown-toc
description: Extract a Markdown heading tree with line numbers before editing or integrating notes. Use when you need to inspect a long Markdown file quickly and choose the best insertion point instead of editing blind.

Markdown TOC

Use this skill when

Use this skill before editing a long Markdown file, especially when you need to:

inspect the heading structure quickly;
choose the best section for new content;
avoid creating redundant sections; or
review nearby lines before patching a note.

Quick start

Resolve {baseDir} to this skill’s actual directory, then run the bundled script. It reports ATX (#) headings, excluding fenced code; Setext headings and full Markdown parsing are outside its scope:

bash

python3 "{baseDir}/scripts/extract_toc.py" /absolute/path/to/file.md

In this repository, common targets include:

bash

python3 "{baseDir}/scripts/extract_toc.py" Notes/Gourmet.md
python3 "{baseDir}/scripts/extract_toc.py" "Notes/AI-Agent-Product&PE.md"

Workflow

Run the TOC script on the candidate file.
Read the returned heading tree and line numbers.
Open the most likely section neighborhood with sed -n '<start>,<end>p' or nl -ba.
Insert into an existing section when possible.
Create a new section only when the file truly lacks a clean landing spot.

Output format

The script prints a compact tree like this:

text

TOC
--------------------------------------------------
# Title (line 1)
  ## Section (line 20)
    ### Subsection (line 42)

Files

SKILL.md and 2 other files (scripts) in .codex/skills/markdown-toc of huangruiteng/CS-Notes.

SKILL.md
agents/openai.yaml
scripts/extract_toc.py

Open the folder on GitHubat commit d01d8f8

Compare with similar skills

Markdown Toc 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.

Markdown Toc compared with similar skills
Skill	Stars	Used in	Tokens	Auto-check	Licence	Repo updated
Markdown Toc this skillhuangruiteng/CS-Notes	4k	—	~390	Automated safety check: Pass	MIT	2 days ago
Markdown Article FormatterJimLiu/baoyu-skills	26k	7 repos	~3.5k	Automated safety check: Pass	MIT	27 days ago
MarkitdownImCa0/just-laws	781	14 repos	~3.2k	Automated safety check: Notes	MIT	today
Obsidian MarkdownAtmosphere/atmosphere	3.8k	20 repos	~1.3k	Automated safety check: Pass	Apache-2.0	yesterday
Gzh Designisjiamu/gzh-design-skill	3.9k	1 repos	~2.2k	Automated safety check: Pass	AGPL-3.0	5 days ago
Crosspostingwasp-lang/wasp	19k	—	~1.1k	Automated safety check: Pass	MIT	today

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More from huangruiteng/CS-Notes

All 38 skills in this repo

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Slack
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4k GitHub starsUsed in 10 repos~578 tokens
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Codex Thread Heartbeat
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4k GitHub stars~1.5k tokensUpdated 2 days ago
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Codex Thread Reader
huangruiteng/CS-Notes
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Research Material Scout
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GitHub
huangruiteng/CS-Notes
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Questions about Markdown Toc

What does Markdown Toc do?

Extract a Markdown heading tree with line numbers before editing or integrating notes. Markdown Toc is an agent skill from huangruiteng/CS-Notes. Extract a Markdown heading tree with line numbers before editing or integrating notes.

When should I use Markdown Toc?

Markdown Toc fits situations like: you need to inspect a long Markdown file quickly and choose the best insertion point instead of editing blind; tasks that involve Markdown.

How do I install Markdown Toc in Claude Code?

Run `npx skills add huangruiteng/CS-Notes --skill markdown-toc -a claude-code`. Or copy the skill folder (.codex/skills/markdown-toc in huangruiteng/CS-Notes) into .claude/skills/markdown-toc in your project. Claude Code loads it when a task matches its description.

How do I install Markdown Toc in Codex?

Run `npx skills add huangruiteng/CS-Notes --skill markdown-toc -a codex`. Or copy the skill folder (.codex/skills/markdown-toc in huangruiteng/CS-Notes) into .agents/skills/markdown-toc in your project. Codex loads it when a task matches its description.

Can I use Markdown Toc 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 huangruiteng/CS-Notes --skill markdown-toc -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/markdown-toc, .gemini/skills/markdown-toc, .github/skills/markdown-toc and .opencode/skills/markdown-toc in your project.

What does Markdown Toc need to run?

Going by SKILL.md and its folder, Markdown Toc needs Python for the scripts in its folder and the command-line tools its instructions call (python3). Our summary lists: Python 3.

Does Markdown Toc 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 Markdown Toc 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 Markdown Toc use?

Markdown Toc 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 Markdown Toc use?

About 390 tokens (SKILL.md is roughly 1.6k 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 Markdown Toc?

Skills that share tags, products or a category with Markdown Toc: Markdown Article Formatter (JimLiu/baoyu-skills, 26k stars), Markitdown (ImCa0/just-laws, 781 stars), Obsidian Markdown (Atmosphere/atmosphere, 3.8k stars) and Gzh Design (isjiamu/gzh-design-skill, 3.9k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Markdown Toc?

huangruiteng (a GitHub user) maintains it in huangruiteng/CS-Notes, which has 4,000 GitHub stars. The repository holds 38 skills in this directory. The repository was last updated on October 6, 2026.

Source: huangruiteng/CS-Notes on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.

Install Markdown Toc

Facts

At a glance

What it does

When your agent uses it

Example prompts

Requirements

Workflow steps

What it can do on your machine

Tool permissions

Runs code

Network

Credentials

Context cost

Safety

SKILL.md

Markdown TOC

Use this skill when

Quick start

Workflow

Output format

Files

Compare with similar skills

Similar skills

More from huangruiteng/CS-Notes

Related

Questions about Markdown Toc