Markdown Article Formatter
JimLiu/baoyu-skills
Reformats plain text or Markdown articles with frontmatter, a title, a summary, headings, bold, lists and code blocks, and saves a separate formatted copy.
Extract all chapters from an EPUB file into separate markdown files.
Install Epub Chapter Extractor
$ npx skills add Abilityai/cornelius --skill epub-chapter-extractor -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install Abilityai/cornelius epub-chapter-extractor --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/Abilityai/cornelius.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.claude/skills/epub-chapter-extractor .claude/skills/epub-chapter-extractor && 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 "epub-chapter-extractor" agent skill from https://github.com/Abilityai/cornelius/tree/main/.claude/skills/epub-chapter-extractor into .claude/skills/epub-chapter-extractor/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "epub-chapter-extractor", 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/Abilityai/cornelius/tree/main/.claude/skills/epub-chapter-extractorType 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 Abilityai/cornelius --skill epub-chapter-extractor -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install Abilityai/cornelius epub-chapter-extractor --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/Abilityai/cornelius.git skills-src && mkdir -p .agents/skills && cp -r skills-src/.claude/skills/epub-chapter-extractor .agents/skills/epub-chapter-extractor && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "epub-chapter-extractor" agent skill from https://github.com/Abilityai/cornelius/tree/main/.claude/skills/epub-chapter-extractor into .agents/skills/epub-chapter-extractor/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "epub-chapter-extractor", 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 Abilityai/cornelius --skill epub-chapter-extractor -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install Abilityai/cornelius epub-chapter-extractor --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/Abilityai/cornelius.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/.claude/skills/epub-chapter-extractor .cursor/skills/epub-chapter-extractor && 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 "epub-chapter-extractor" agent skill from https://github.com/Abilityai/cornelius/tree/main/.claude/skills/epub-chapter-extractor into .cursor/skills/epub-chapter-extractor/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "epub-chapter-extractor", 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/Abilityai/cornelius.git --path .claude/skills/epub-chapter-extractor--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 Abilityai/cornelius --skill epub-chapter-extractor -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install Abilityai/cornelius epub-chapter-extractor --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/Abilityai/cornelius.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/.claude/skills/epub-chapter-extractor .gemini/skills/epub-chapter-extractor && 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 "epub-chapter-extractor" agent skill from https://github.com/Abilityai/cornelius/tree/main/.claude/skills/epub-chapter-extractor into .gemini/skills/epub-chapter-extractor/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "epub-chapter-extractor", 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 Abilityai/cornelius epub-chapter-extractorInstalls 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 Abilityai/cornelius --skill epub-chapter-extractor -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/Abilityai/cornelius.git skills-src && mkdir -p .github/skills && cp -r skills-src/.claude/skills/epub-chapter-extractor .github/skills/epub-chapter-extractor && 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 "epub-chapter-extractor" agent skill from https://github.com/Abilityai/cornelius/tree/main/.claude/skills/epub-chapter-extractor into .github/skills/epub-chapter-extractor/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "epub-chapter-extractor", 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 Abilityai/cornelius --skill epub-chapter-extractor -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install Abilityai/cornelius epub-chapter-extractor --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/Abilityai/cornelius.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/.claude/skills/epub-chapter-extractor .opencode/skills/epub-chapter-extractor && 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 "epub-chapter-extractor" agent skill from https://github.com/Abilityai/cornelius/tree/main/.claude/skills/epub-chapter-extractor into .opencode/skills/epub-chapter-extractor/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "epub-chapter-extractor", 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
epub-chapter-extractor- GitHub stars
- 109
- Used in
- 1 other repo
- Token cost
- ~351 tokens
- SKILL.md length
- 83 words
- Files
- 1
- Skills in repo
- 51
- Repo updated
- First seen
- Licence
- MIT
At a glance
Extract all chapters from an EPUB file into separate markdown files.
- The user wants to split an EPUB into individual chapter files
- SKILL.md covers Instructions, Example and Output Format
- Calls uv
- Extract EPUB chapters
What it does
Epub Chapter Extractor is an agent skill from Abilityai/cornelius. Extract all chapters from an EPUB file into separate markdown files. Use when the user wants to split an EPUB into individual chapter files, extract EPUB chapters, or convert an ebook to separate markdown documents.
Its SKILL.md is about 350 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 Documents & Office. The repository describes itself as: AI-powered second brain template for Claude Code + Obsidian. The licence is MIT.
When your agent uses it
- The user wants to split an EPUB into individual chapter files
- Extract EPUB chapters
- Convert an ebook to separate markdown documents
Example prompts
- “/epub-chapter-extractor”
Requirements
- Python 3
What it can do on your machine
Read from SKILL.md and the folder at commit fd5e9a4. 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
Shell commands in SKILL.md call:
uv
From the folder's file list and the shell code blocks in SKILL.md.
Network
No URLs in SKILL.md. Its commands use uv, which can reach the network depending on how they are called.
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
Epub Chapter Extractor loads about 351 tokens when it runs. Until then it costs about 60 tokens; SKILL.md has 83 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 Abilityai/cornelius at commit fd5e9a4, republished under its MIT licence (© Abilityai). 83 words, ~351 tokens.
Download SKILL.mdSave it as
.claude/skills/epub-chapter-extractor/SKILL.md (or your agent's skills folder).- name
- epub-chapter-extractor
- description
- Extract all chapters from an EPUB file into separate markdown files. Use when the user wants to split an EPUB into individual chapter files, extract EPUB chapters, or convert an ebook to separate markdown documents.
EPUB Chapter Extractor
Extract each chapter from an EPUB file into its own markdown file.
Instructions
When the user wants to extract chapters from an EPUB, run the extraction script with uv:
cd ~/.claude/skills/epub-chapter-extractor && uv run --with ebooklib --with beautifulsoup4 --with html2text --with lxml python extract_chapters.py "/path/to/book.epub" [output_dir]If output_dir is omitted, creates a folder named after the EPUB in the same directory.
Example
User: "Extract chapters from /Users/yourname/Books/mybook.epub"
cd ~/.claude/skills/epub-chapter-extractor && uv run --with ebooklib --with beautifulsoup4 --with html2text --with lxml python extract_chapters.py "/Users/yourname/Books/mybook.epub"Output files will be at /Users/yourname/Books/mybook/:
01_introduction.md02_chapter_one.md- etc.
After extraction, open the output folder:
open /Users/yourname/Books/mybookOutput Format
Each chapter file contains:
# Chapter Title
[Chapter content in markdown format]Files are numbered for proper sorting: 01_, 02_, etc.
© Abilityai, 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 .claude/skills/epub-chapter-extractor of Abilityai/cornelius.
Open the folder on GitHubat commit fd5e9a4
Used in 1 other repository
We found 1 copy of this SKILL.md (exact, near-identical or edited) in other folders, from 1 other GitHub owner. This page covers the copy in Abilityai/cornelius, which our catalogue first saw on October 7, 2026.
Compare with similar skills
Epub Chapter Extractor 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 |
|---|---|---|---|---|---|---|
| Epub Chapter Extractor this skillAbilityai/cornelius | 109 | 1 repos | ~351 | Automated safety check: Pass | MIT | |
| Markdown Article FormatterJimLiu/baoyu-skills | 26k | 7 repos | ~3.5k | Automated safety check: Pass | MIT | |
| MarkitdownImCa0/just-laws | 781 | 14 repos | ~3.2k | Automated safety check: Notes | MIT | |
| Obsidian MarkdownAtmosphere/atmosphere | 3.8k | 20 repos | ~1.3k | Automated safety check: Pass | Apache-2.0 | |
| DOCXrvdbreemen/OTGW-firmware | 207 | 33 repos | ~4.3k | Automated safety check: Pass | Proprietary | |
| Gzh Designisjiamu/gzh-design-skill | 3.9k | 1 repos | ~2.2k | Automated safety check: Pass | AGPL-3.0 |
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Questions about Epub Chapter Extractor
What does Epub Chapter Extractor do?
Extract all chapters from an EPUB file into separate markdown files. Epub Chapter Extractor is an agent skill from Abilityai/cornelius. Extract all chapters from an EPUB file into separate markdown files.
When should I use Epub Chapter Extractor?
Epub Chapter Extractor fits situations like: the user wants to split an EPUB into individual chapter files; extract EPUB chapters; convert an ebook to separate markdown documents.
How do I install Epub Chapter Extractor in Claude Code?
Run `npx skills add Abilityai/cornelius --skill epub-chapter-extractor -a claude-code`. Or copy the skill folder (.claude/skills/epub-chapter-extractor in Abilityai/cornelius) into .claude/skills/epub-chapter-extractor in your project. Claude Code loads it when a task matches its description.
How do I install Epub Chapter Extractor in Codex?
Run `npx skills add Abilityai/cornelius --skill epub-chapter-extractor -a codex`. Or copy the skill folder (.claude/skills/epub-chapter-extractor in Abilityai/cornelius) into .agents/skills/epub-chapter-extractor in your project. Codex loads it when a task matches its description.
Can I use Epub Chapter Extractor 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 Abilityai/cornelius --skill epub-chapter-extractor -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/epub-chapter-extractor, .gemini/skills/epub-chapter-extractor, .github/skills/epub-chapter-extractor and .opencode/skills/epub-chapter-extractor in your project.
What does Epub Chapter Extractor need to run?
Going by SKILL.md and its folder, Epub Chapter Extractor needs the command-line tools its instructions call (uv). Our summary lists: Python 3.
Does Epub Chapter Extractor access the network?
SKILL.md contains no URLs. Its commands use uv, which can reach the network depending on how they are called. This is read from the text; nothing was executed.
Is Epub Chapter Extractor 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 Epub Chapter Extractor use?
Epub Chapter Extractor 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 Epub Chapter Extractor use?
About 351 tokens (SKILL.md is roughly 1.4k 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 Epub Chapter Extractor?
Skills that share tags, products or a category with Epub Chapter Extractor: Markdown Article Formatter (JimLiu/baoyu-skills, 26k stars), Markitdown (ImCa0/just-laws, 781 stars), Obsidian Markdown (Atmosphere/atmosphere, 3.8k stars) and DOCX (rvdbreemen/OTGW-firmware, 207 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Epub Chapter Extractor?
Abilityai (a GitHub organization) maintains it in Abilityai/cornelius, which has 109 GitHub stars. The repository holds 51 skills in this directory. The repository was last updated on September 22, 2026.
Source: Abilityai/cornelius on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.