# Chapter Index File Structure

> This Mermaid diagram shows the structure of a chapter index.md file for intelligent textbooks.

- Skill: `tools-only/chapter-index-file-structure` (Agent Skill, multi-file: 3 files)
- Install (CLI): `npx skillmds@latest add tools-only/chapter-index-file-structure`
- Raw SKILL.md: https://api.skillmd.com/api/skills/tools-only/chapter-index-file-structure/raw
- Safety review: pending (external: skill-scanner PASS, skillspector PASS)
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Coding & Dev Tools
- Author: tools-only (https://skillmd.com/u/tools-only)
- Updated: 2026-09-29
- Page: https://skillmd.com/skills/tools-only/chapter-index-file-structure

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# Chapter Index File Structure


<iframe src="main.html" width="100%" height="600px"></iframe>


**Copy this iframe to your website:**

```html
<iframe src="https://dmccreary.github.io/claude-skills/sims/chapter-index-structure/main.html" width="100%" height="600px"></iframe>
```


[Run Chapter Index File Structure in Fullscreen](main.html){ .md-button .md-button--primary }


This Mermaid diagram shows the structure of a chapter index.md file for intelligent textbooks.

## Interactive Diagram



## Overview

Visualizes the document outline including YAML frontmatter, required sections (title, summary, concepts), and optional elements (prerequisites, learning objectives).