Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx agentmods add skills/abilityai/cornelius/epub-chapter-extractornpx skills add Abilityai/cornelius --skill epub-chapter-extractorgit clone --depth 1 https://github.com/Abilityai/corneliusWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/abilityai/cornelius/epub-chapter-extractor)<a href="https://agentmods.dev/skills/abilityai/cornelius/epub-chapter-extractor"><img src="https://agentmods.dev/badge/skills/abilityai/cornelius/epub-chapter-extractor.svg" alt="Measured on agentmods" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5 | $0.00046 | $0.00348 |
| Opus 5 | $0.00023 | $0.00174 |
| Sonnet 5 | $0.00009 | $0.00070 |
| Haiku 4.5 | $0.00005 | $0.00035 |
Grade A, and why
epub-chapter-extractor scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 4d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
What it actually says
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/mybook
Output Format
Each chapter file contains:
# Chapter Title
[Chapter content in markdown format]
Files are numbered for proper sorting: 01_, 02_, etc.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 4d ago First seen · 50 lines · 46 tokens per session scan A 6fc1abc9c6f6
epub-chapter-extractor is a skill published in the GitHub repository Abilityai/cornelius (105 stars, last pushed 11d ago), licensed MIT. It adds 46 tokens to every session and 348 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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