Scan and fix PDFs: PDF/UA, Matterhorn checks, tags and reading order.

MITAuto-check passedDocuments & Office

Install PDF Accessibility

skills CLI
$ npx skills add Community-Access/accessibility-agents --skill pdf-accessibility -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI
$ gh skill install Community-Access/accessibility-agents pdf-accessibility --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy
$ git clone --depth 1 https://github.com/Community-Access/accessibility-agents.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/pdf-accessibility .claude/skills/pdf-accessibility && rm -rf skills-src

Use ~/.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/

Facts

Skill name
pdf-accessibility
GitHub stars
422
Token cost
~1.4k tokens
SKILL.md length
623 words
Files
6 (incl. references)
Skills in repo
108
Repo updated
First seen
Licence
MIT

At a glance

Scan and fix PDFs: PDF/UA, Matterhorn checks, tags and reading order.

  • Works in 7 steps: Always scan before advising - never… → Report rule IDs with every finding for… → Distinguish automated findings from… → …
  • Tasks that involve PDF
  • SKILL.md covers Native-Tool-First Guidance, Your Scope, PDF Structure Fundamentals and Verification Tools, plus 4 more sections
  • Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md

What it does

PDF Accessibility is an agent skill from Community-Access/accessibility-agents. Scan and fix PDFs: PDF/UA, Matterhorn checks, tags and reading order.

Its SKILL.md is about 1.4k tokens, which your agent loads only when the skill is triggered. The skill folder holds 8 other files, including reference files (for example `agents/openai.yaml`, `examples/findings.json` and `references/remediation-guidance.md`).

It sits in Documents & Office, covering PDF and Accessibility. The repository describes itself as: Accessibility review agents for Claude Code, GitHub Copilot, and Claude Desktop. Eleven specialists that enforce WCAG 2.2 AA compliance so AI coding tools stop generating… The licence is MIT.

When your agent uses it

  • Tasks that involve PDF
  • Tasks that involve Accessibility

Example prompts

  • “/pdf-accessibility”

Workflow steps

7 steps, taken from the first numbered list in SKILL.md.

  1. Always scan before advising - never guess at PDF issues
  2. Report rule IDs with every finding for traceability
  3. Distinguish automated findings from items needing human review
  4. For untagged PDFs, recommend rebuilding from source as first option
  5. Never suggest removing tags to "fix" issues
  6. Always recommend veraPDF for full PDF/UA conformance verification
  7. When in doubt about alt text quality or reading order, flag for human review

What it can do on your machine

Read from SKILL.md and the folder at commit decf6ba. 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

    No scripts in the folder and no shell commands in SKILL.md (its code samples are json).

    From the folder's file list and the shell code blocks in SKILL.md.

  • Network

    No URLs in SKILL.md.

    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

PDF Accessibility loads about 1.4k tokens when it runs, and up to ~3.9k if it reads all its reference files. Until then it costs about 22 tokens; SKILL.md has 623 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~22
When it runs · the whole SKILL.md, loaded when a task matches
~1.4k
With references · SKILL.md plus every file in references/, read only if the agent opens them
~3.9k

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 Community-Access/accessibility-agents at commit decf6ba, republished under its MIT licence (© Community-Access). 623 words, ~1,393 tokens.

Download SKILL.mdSave it as .claude/skills/pdf-accessibility/SKILL.md (or your agent's skills folder). This skill also uses 5 other files; get the full folder from GitHub.
name
pdf-accessibility
description
Scan and fix PDFs: PDF/UA, Matterhorn checks, tags and reading order.
license
MIT
disable-model-invocation
true
metadata.tier
specialist
metadata.domain
documents
metadata.output
findings
metadata.effort
medium
metadata.title
PDF Accessibility

You are the PDF document accessibility specialist. You ensure PDF files conform to PDF/UA (ISO 14289-1) and WCAG 2.1 AA requirements. PDFs are the most common format for formal documents, reports, invoices, and government publications - an inaccessible PDF locks out every screen reader user.

Native-Tool-First Guidance

When you explain findings or generate report content, lead with the fix path in Adobe Acrobat Pro.

  • Start with Acrobat Pro tools and menu paths the author can follow immediately.
  • Keep the first remediation explanation short, practical, and action-oriented.
  • Put PDF object model, tag tree internals, veraPDF, source rebuild, or automation detail after the Acrobat workflow under Advanced / Technical Follow-Up.
  • When writing summary reports, use labels like Start Here, Why It Matters, and Advanced / Technical Follow-Up.
  • If rebuilding from source is the best long-term fix, still present the quickest Acrobat Pro triage steps first unless the PDF is fundamentally unrepairable.

Your Scope

You own everything related to PDF document accessibility:

  • PDF/UA conformance (tagged structure, structure tree, role mapping)
  • Matterhorn Protocol automated and human checks (31 checkpoints, 136 failure conditions)
  • Document metadata (title, language, author)
  • Figure alt text and artifact marking
  • Table structure (TH/TD, scope, headers)
  • Reading order and logical structure
  • Bookmarks/outlines for navigation
  • Form field accessibility (labels, tab order, tooltips)
  • Link annotations and meaningful link text
  • Text extraction and Unicode mapping
  • Font embedding
  • Color contrast and visual presentation
  • Scanned/image-only PDF detection

PDF Structure Fundamentals

PDF accessibility depends on a tagged structure tree that provides semantic meaning to visual content:

Key PDF Objects
  • StructTreeRoot - Root of the logical structure tree (required for PDF/UA)
  • MarkInfo - Contains /Marked true flag indicating the PDF is tagged
  • Info dictionary - Document metadata: /Title, /Author, /Subject, /Keywords
  • Catalog - Document-level settings: /Lang, /StructTreeRoot, /Outlines
  • Structure elements - Semantic tags: /P, /H1-/H6, /Table, /Figure, /L, /Link
Common Structure Elements

Each tag, with its meaning and accessibility role.

TagMeaningAccessibility Role
/DocumentRoot containerDocument landmark
/PParagraphText block
/H, /H1-/H6HeadingsNavigation landmarks
/L, /LI, /Lbl, /LBodyList structureStructured list
/Table, /TR, /TH, /TDTable structureData table
/FigureImage/illustrationRequires /Alt text
/LinkHyperlinkMust have text content
/FormForm widgetRequires label
/ArtifactDecorative/non-contentIgnored by AT
/SpanInline containerLanguage changes

Verification Tools

Show full SKILL.md (258 more words)Show less
Automated
  • MCP scan_pdf_document tool - Built-in scanner checking structure, metadata, and tagging
  • veraPDF - Open-source PDF/UA validator: verapdf --flavour ua1 file.pdf
  • PAC (PDF Accessibility Checker) - Windows GUI tool for PDF/UA validation
Manual Verification Required

These aspects cannot be fully verified by automated tools:

  • Alt text quality (describes the meaningful content, not just "image")
  • Reading order correctness (visual order matches logical order)
  • Color contrast within embedded images
  • Table header/data cell relationships in complex tables
  • Language changes within mixed-language content
  • Form field grouping and instructions
  • Meaningful sequence of content

Configuration

Pair with pdf-scan-config to manage which rules are active:

json
// .a11y-pdf-config.json
{
  "enabled": true,
  "disabledRules": [],
  "severityFilter": ["error", "warning", "tip"],
  "maxFileSize": 104857600
}
Preset Profiles
  • strict - All rules enabled, all severities (recommended for public/government documents)
  • moderate - All rules enabled, errors + warnings only
  • minimal - Only PDFUA and PDFQ error rules

Behavioral Rules

  1. Always scan before advising - never guess at PDF issues
  2. Report rule IDs with every finding for traceability
  3. Distinguish automated findings from items needing human review
  4. For untagged PDFs, recommend rebuilding from source as first option
  5. Never suggest removing tags to "fix" issues
  6. Always recommend veraPDF for full PDF/UA conformance verification
  7. When in doubt about alt text quality or reading order, flag for human review

Reference files

Read one only when the task reaches it. Do not read them all up front.

  • references/rule-layers.md - Rule Layers
  • references/remediation-guidance.md - Remediation Guidance
  • references/structured-output-for-sub-agent-use.md - Structured Output for Sub-Agent Use, Multi-Agent Reliability

Output contract

Return only JSON matching skills/a11y-core/schemas/findings.schema.json. No prose, no summary, no restated instructions. One object, one array of findings.

Shared rules, dispatch contract and schemas: skills/a11y-core/SKILL.md. Authoritative specifications for this skill: skills/a11y-core/references/sources.md.

© Community-Access, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

SKILL.md and 5 other files (references) in skills/pdf-accessibility of Community-Access/accessibility-agents.

  • SKILL.md
  • agents/openai.yaml
  • examples/findings.json
  • references/remediation-guidance.md
  • references/rule-layers.md
  • references/structured-output-for-sub-agent-use.md

Open the folder on GitHubat commit decf6ba

Compare with similar skills

PDF Accessibility 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.

PDF Accessibility compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
PDF Accessibility this skillCommunity-Access/accessibility-agents422—~1.4kAutomated safety check: PassMIT
Accessible Document CreatorFerroxLabs/wayland608—~4.3kAutomated safety check: PassApache-2.0
Thu Digitizerfranklee16/academic-research-skills223—~8.5kAutomated safety check: PassMIT
Minimax PDFpoco-ai/poco-claw1.4k6 repos~2.1kAutomated safety check: PassMIT
Openkb HTML CriticVectifyAI/OpenKB4.7k1 repos~1.4kAutomated safety check: PassApache-2.0
Frontend Textbooksonepixelaway/frontend-textbooks106—~3.5kAutomated safety check: PassMIT

Similar skills

  • Accessible Document Creator

    FerroxLabs/wayland

    Create accessible PDF, Word, PowerPoint, and email documents with proper structure, reading order, alternative text, and compliance with PDF/UA, WCAG, and Section 508 standards.

    608 GitHub stars~4.3k tokensUpdated 2 days ago
    Documents & OfficeAuto-check passed
  • Thu Digitizer

    franklee16/academic-research-skills

    Extract and validate numeric data from chart images, PDF figures, and official source-data files locally and reproducibly, with calibrated axes, compact-scatter recovery plus residual audits…

    223 GitHub stars~8.5k tokensUpdated 20 days ago
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  • Minimax PDF

    poco-ai/poco-claw

    A skill your agent uses when visual quality and design identity matter for a PDF.

    1.4k GitHub starsUsed in 6 repos~2.1k tokens
    Documents & OfficeAuto-check passed
  • Openkb HTML Critic

    VectifyAI/OpenKB

    A skill your agent uses to review a generated HTML deck or single-page artifact for visual quality and structural correctness.

    4.7k GitHub starsUsed in 1 repo~1.4k tokens
    Documents & OfficeAuto-check passed
  • Frontend Textbooks

    onepixelaway/frontend-textbooks

    Turns a manuscript into a designed US Letter HTML book with a matching PDF, original cover art and checks that the manuscript text is preserved.

    106 GitHub stars~3.5k tokensUpdated 2 mo ago
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  • Sharepoint Safe HTML

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More from Community-Access/accessibility-agents

All 108 skills in this repo
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    Reference data, not a reviewer. An agent skill from Community-Access/accessibility-agents.

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  • Accessibility Lead

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    Web UI accessibility lead. An agent skill from Community-Access/accessibility-agents.

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  • Alt Text Headings

    Community-Access/accessibility-agents

    Alt text, SVGs, figures, charts, heading order, page titles and landmarks.

    422 GitHub stars~1.5k tokensUpdated 15 days ago
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  • Aria Specialist

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    422 GitHub stars~1.6k tokensUpdated 15 days ago
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  • Cognitive Accessibility

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Questions about PDF Accessibility

What does PDF Accessibility do?

Scan and fix PDFs: PDF/UA, Matterhorn checks, tags and reading order. PDF Accessibility is an agent skill from Community-Access/accessibility-agents. Scan and fix PDFs: PDF/UA, Matterhorn checks, tags and reading order.

When should I use PDF Accessibility?

PDF Accessibility fits situations like: tasks that involve PDF; tasks that involve Accessibility.

How do I install PDF Accessibility in Claude Code?

Run `npx skills add Community-Access/accessibility-agents --skill pdf-accessibility -a claude-code`. Or copy the skill folder (skills/pdf-accessibility in Community-Access/accessibility-agents) into .claude/skills/pdf-accessibility in your project. Claude Code loads it when a task matches its description.

How do I install PDF Accessibility in Codex?

Run `npx skills add Community-Access/accessibility-agents --skill pdf-accessibility -a codex`. Or copy the skill folder (skills/pdf-accessibility in Community-Access/accessibility-agents) into .agents/skills/pdf-accessibility in your project. Codex loads it when a task matches its description.

Can I use PDF Accessibility 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 Community-Access/accessibility-agents --skill pdf-accessibility -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/pdf-accessibility, .gemini/skills/pdf-accessibility, .github/skills/pdf-accessibility and .opencode/skills/pdf-accessibility in your project.

What does PDF Accessibility need to run?

SKILL.md names no scripts, command-line tools or credentials: PDF Accessibility is instructions for the agent only.

Does PDF Accessibility access the network?

SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.

Is PDF Accessibility 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 PDF Accessibility use?

PDF Accessibility is published under the MIT licence (declared in SKILL.md). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does PDF Accessibility use?

About 1.4k tokens (SKILL.md is roughly 5.6k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full. Its references folder adds about 2.6k tokens, read only when the agent opens those files.

What are the alternatives to PDF Accessibility?

Skills that share tags, products or a category with PDF Accessibility: Accessible Document Creator (FerroxLabs/wayland, 608 stars), Thu Digitizer (franklee16/academic-research-skills, 223 stars), Minimax PDF (poco-ai/poco-claw, 1.4k stars) and Openkb HTML Critic (VectifyAI/OpenKB, 4.7k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains PDF Accessibility?

Community-Access (a GitHub organization) maintains it in Community-Access/accessibility-agents, which has 422 GitHub stars. The repository holds 108 skills in this directory. The repository was last updated on September 23, 2026.

Source: Community-Access/accessibility-agents on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.