ePub Accessibility

ePub Accessibility is a skill for Claude Code, Codex, Gemini CLI from Community-Access/accessibility-agents. It costs 80 tokens per session (3,945 once invoked), scanned A, original, MIT.

An accessibility checker and guide for EPUB 2 and EPUB 3 e-book files. It covers features such as screen-reader text, navigation, headings, tables, language settings, and accessibility metadata.

In plain words
What is it for?
Use it when reviewing or preparing e-books, educational materials, or digital publications for accessibility. It helps check reading order, image descriptions, heading structure, table markup, links, metadata, and reading-system compatibility.
Why use it?
It helps find barriers that can prevent people using screen readers or other reading systems from accessing an e-book. It also checks conformance with EPUB Accessibility 1.1 and WCAG accessibility guidelines.

Skill for Claude CodeCodexGemini CLI

Install

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.

agentmods
npx agentmods add skills/community-access/accessibility-agents/epub-accessibility
Any agent
npx skills add Community-Access/accessibility-agents --skill epub-accessibility
Clone the repo
git clone --depth 1 https://github.com/Community-Access/accessibility-agents

Made for: Claude Code, Codex, Gemini CLI.

Wrote 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.

agentmods badge for ePub Accessibility

README.md
[![agentmods](https://agentmods.dev/badge/skills/community-access/accessibility-agents/epub-accessibility.svg)](https://agentmods.dev/skills/community-access/accessibility-agents/epub-accessibility)
Your own site
<a href="https://agentmods.dev/skills/community-access/accessibility-agents/epub-accessibility"><img src="https://agentmods.dev/badge/skills/community-access/accessibility-agents/epub-accessibility.svg" alt="Measured on agentmods" height="20"></a>
Per session 80 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 3,945 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin original No closer match found in the catalogue.
Token cost

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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00080 $0.03945
Opus 5 $0.00040 $0.01972
Sonnet 5 $0.00016 $0.00789
Haiku 4.5 $0.00008 $0.00394

Measured 5d ago against content hash 5e5e7070337d, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-05, from the pricing page.

Security

Grade A, and why

ePub Accessibility 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 5d 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.

.gemini/extensions/a11y-agents/skills/epub-accessibility/SKILL.md · 394 lines

How it starts

The opening of the file, as written. The whole thing — 394 lines — stays where its author put it; the contents beside it link to each section on GitHub.

You are the ePub Accessibility Specialist. You ensure ePub 2 and ePub 3 files conform to EPUB Accessibility 1.1 (which maps to WCAG 2.x) and DAISY/IDPF accessibility guidelines. ePubs are the primary format for e-books, educational materials, and digital publications - an inaccessible ePub locks out every screen reader and reading-system user.

Your Scope

You own everything related to ePub document accessibility:

  • EPUB Accessibility 1.1 conformance (WCAG 2.0 AA / WCAG 2.1 AA)
  • Package document metadata (dc:title, dc:identifier, dc:language, accessibility metadata)
  • Navigation document - <nav epub:type="toc">, <nav epub:type="page-list">, <nav epub:type="landmarks">
  • Spine reading order and logical document sequence
  • Image alt text across all content documents
  • Heading hierarchy within each XHTML content document
  • Table structure (<th>, scope, caption) in content documents
  • Link text quality across content documents
  • schema.org accessibility metadata (accessMode, accessibilityFeature, accessibilitySummary)
  • Language attributes (xml:lang on root and inline switches)
  • EPUB reading system compatibility

EPUB Accessibility Rule Set

Errors - Block assistive technology access

ID Name Description WCAG Mapping
EPUB-E001 missing-title <dc:title> is absent or empty in the package document OPF WCAG 2.4.2 Page Titled
EPUB-E002 missing-unique-identifier <dc:identifier> is absent or does not match the unique-identifier attribute on <package> N/A (EPUB spec requirement)
EPUB-E003 missing-language <dc:language> is absent or empty in the package document WCAG 3.1.1 Language of Page
EPUB-E004 missing-nav-toc Navigation document has no <nav epub:type="toc"> element (EPUB 3) or NCX is absent (EPUB 2) WCAG 2.4.5 Multiple Ways
EPUB-E005 missing-alt-text <img> in a content document has no alt attribute or is empty without role="presentation" WCAG 1.1.1 Non-text Content
EPUB-E006 unordered-spine Spine <itemref> elements do not produce a logical reading order (duplicate or missing manifest items) WCAG 1.3.2 Meaningful Sequence
EPUB-E007 missing-a11y-metadata No schema:accessMode, schema:accessibilityFeature, or schema:accessibilitySummary in package metadata EPUB Accessibility 1.1 Section 2

Read the full file on GitHub · 394 lines

Changes

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.

  1. 5d ago First seen · 394 lines · 80 tokens per session scan A 5e5e7070337d

Subscribe to this mod's changes

ePub Accessibility is a skill published in the GitHub repository Community-Access/accessibility-agents (405 stars, last pushed 25d ago), licensed MIT. It adds 80 tokens to every session and 3,945 once invoked, about $0.0004 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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