Borrowing it
Nothing to install: this file belongs to smerchek/claude-epub-skill. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/smerchek/claude-epub-skill/main/CLAUDE.mdgit clone --depth 1 https://github.com/smerchek/claude-epub-skillWrote 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/instructions/smerchek/claude-epub-skill/claude-md)<a href="https://agentmods.dev/instructions/smerchek/claude-epub-skill/claude-md"><img src="https://agentmods.dev/badge/instructions/smerchek/claude-epub-skill/claude-md/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/instructions/smerchek/claude-epub-skill/claude-md"><img src="https://agentmods.dev/badge/instructions/smerchek/claude-epub-skill/claude-md.svg" alt="Reviewed on agentmods" width="80" 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 5.1 | $0.01618 | $0.01618 |
| Opus 5 | $0.00809 | $0.00809 |
| Sonnet 5 | $0.00324 | $0.00324 |
| Haiku 4.5 | $0.00162 | $0.00162 |
Grade A, and why
claude-epub-skill CLAUDE.md 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 9d 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.
How it starts
The opening of the file, as written. The whole thing — 231 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Markdown to EPUB Skill - Development Guide
Project Overview
A Claude agent skill that converts markdown documents into professional EPUB3 ebook files. This is a custom skill implementation demonstrating how to build Claude Code skills with file generation capabilities.
Quick Start
Setup
# Install dependencies
pip install -r markdown-to-epub/requirements.txt
# Test the skill
python test_epub_skill.py
Usage
from markdown_to_epub.scripts.epub_generator import create_epub_from_markdown
create_epub_from_markdown(
markdown_content,
output_path="output.epub",
title="My Book",
author="Author Name"
)
Project Structure
markdown-to-epub/
├── SKILL.md # Skill definition with YAML frontmatter
├── requirements.txt # Python dependencies (ebooklib, markdown2)
├── scripts/
│ ├── markdown_processor.py # Markdown parsing & structure extraction
│ └── epub_generator.py # EPUB file creation & formatting
test_epub_skill.py # Test suite
Claude Skills Development Guidelines
Skill Definition (SKILL.md)
- Must include YAML frontmatter with
nameanddescription - Description should be clear and actionable for Claude to understand when to use the skill
- Include detailed usage examples showing input formats and expected outputs
- Document all supported features and edge cases
Python Implementation
- Keep dependencies minimal and well-documented in
requirements.txt - Separate concerns: parsing logic vs. file generation
- Handle edge cases gracefully (empty input, malformed markdown, etc.)
- Include comprehensive error handling and validation
Testing
- Create standalone test file that validates all major functionality
- Test edge cases: empty content, special characters, long documents
- Verify output file quality and standards compliance
- Make tests runnable without external dependencies
Development Best Practices
Code Organization
- Processing Scripts: Put core logic in
scripts/directory - Configuration: Use YAML frontmatter in SKILL.md for metadata
- Resources: Keep static assets (CSS, templates) in
resources/(if needed) - Tests: Standalone test files at project root
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.
- 9d ago First seen · 231 lines · 1,618 tokens per session scan A 64112c218b5e
claude-epub-skill CLAUDE.md is an instructions file published in the GitHub repository smerchek/claude-epub-skill (158 stars, last pushed 10mo ago), licensed MIT. It adds 1,618 tokens to every session, about $0.0081 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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