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Agent skill

Accessibility Diff

by AccessLint in AccessLint/skills

Regression check — diff a live page's web accessibility (a11y) violations against a baseline.

No licenceAuto-check: notesFrontend & Design

Install Accessibility Diff

skills CLI
$ npx skills add AccessLint/skills --skill accessibility-diff -a claude-code

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

GitHub CLI
$ gh skill install AccessLint/skills accessibility-diff --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/AccessLint/skills.git skills-src && mkdir -p .claude/skills && cp -r skills-src/plugins/accesslint/skills/accessibility-diff .claude/skills/accessibility-diff && 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
accessibility-diff
GitHub stars
103
Used in
1 other repo
Token cost
~1.1k tokens
SKILL.md length
350 words
Files
1
Skills in repo
5
Repo updated
First seen
Licence
None found

At a glance

Regression check — diff a live page's web accessibility (a11y) violations against a baseline.

  • Works in 3 steps: Audit → Report → Tear down
  • Did my change break accessibility
  • SKILL.md covers 1. Audit, 2. Report, 3. Tear down and Notes
  • Calls git, npx and node

What it does

Accessibility Diff is an agent skill from AccessLint/skills. Regression check — diff a live page's web accessibility (a11y) violations against a baseline. By default it compares your uncommitted changes (stash-based); pass --branch [<name] to compare against a branch. Reports the new WCAG violations introduced, the ones fixed, and the count of pre-existing ones. Use it for 'did my change break accessibility', 'what a11y issues did this PR add', or as a CI gate. For a full scan of one page use accessibility-scan; for a whole site use accessibility-audit.

Its SKILL.md is about 1.1k tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.

It sits in Frontend & Design, covering Accessibility.

When your agent uses it

  • Did my change break accessibility
  • What a11y issues did this PR add

Example prompts

  • “did my change break accessibility”
  • “what a11y issues did this PR add”
  • “/accessibility-diff”

Requirements

  • Node.js
  • Pre-approved tools (allowed-tools): Bash, Read, Glob, Grep, Skill, Task

Workflow steps

3 steps, taken from the step headings in SKILL.md.

  1. Audit
  2. Report
  3. Tear down

What it can do on your machine

Read from SKILL.md and the folder at commit 2e9d733. It shows what the files ask for, not the result of running them.

  • Tool permissions

    Pre-approves these tools, so the agent can use them without asking each time:

    • Bash
    • Read
    • Glob
    • Grep
    • Skill
    • Task

    From allowed-tools in the SKILL.md frontmatter.

  • Runs code

    Shell commands in SKILL.md call:

    • git
    • npx
    • node

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

  • Network

    No URLs in SKILL.md. Its commands use git and npx, which can reach the network depending on how they are called.

    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

Accessibility Diff loads about 1.1k tokens when it runs. Until then it costs about 131 tokens; SKILL.md has 350 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~131
When it runs · the whole SKILL.md, loaded when a task matches
~1.1k

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: notes

The automated check noted patterns worth knowing about, such as sudo or a known installer.

  • NotePre-approves every shell command (allowed-tools: Bash)SKILL.md
    allowed-tools: Bash, Read, Glob, Grep, Skill, Task

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

Without a licence we can't republish the file, so here is its outline and opening line. It has 350 words (~1,087 tokens).

“Default branch: !git symbolic-ref refs/remotes/origin/HEAD --short 2>/dev/null | sed 's|.*/||' || echo main”

— opening of SKILL.md by AccessLint
name
accessibility-diff
allowed-tools
Bash, Read, Glob, Grep, Skill, Task
argument-hint
[--branch [<name>]] [target|url]

Read the full SKILL.md on GitHub

Files

Just SKILL.md in plugins/accesslint/skills/accessibility-diff of AccessLint/skills.

Open the folder on GitHubat commit 2e9d733

Used in 1 other repository

We found 1 copy of this SKILL.md (exact, near-identical or edited) in other folders, from 1 other GitHub owner. This page covers the copy in AccessLint/skills, which our catalogue first saw on October 7, 2026.

Compare with similar skills

Accessibility Diff 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.

Accessibility Diff compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Accessibility Diff this skillAccessLint/skills1031 repos~1.1kAutomated safety check: NotesNone
Web Interface Guidelines Reviewervercel-labs/openreview1.7k98 repos~308Automated safety check: PassNone
Accessibility Reviewmarkmead/hyperui12k1 repos~1.1kAutomated safety check: PassMIT
Web Animation DesignbaptisteArno/typebot.io11k2 repos~2.7kAutomated safety check: PassCustom licence
Accessibility Fixeribelick/ui-skills9.4k4 repos~1.2kAutomated safety check: PassMIT
Wcag Audit PatternsvmDeshpande/ai-agent-automation17810 repos~610Automated safety check: PassApache-2.0

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  • Web Interface Guidelines Reviewer

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  • Accessibility Review

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  • Accessibility Fixer

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More from AccessLint/skills

  • Accessibility Inspect

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    103 GitHub starsUsed in 1 repo~3k tokens
    Auto-check: notes

  • Accessibility Audit

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    103 GitHub starsUsed in 1 repo~1.8k tokens
    Auto-check: notes

  • Accessibility Scan

    AccessLint/skills

    One page, automated tier — run the web accessibility (a11y) rule engine against a live page and locate every violation it can detect mechanically.

    103 GitHub starsUsed in 1 repo~682 tokens
    Auto-check: notes

  • Accessibility Fix

    AccessLint/skills

    Remediation only — repair web accessibility (a11y) violations against WCAG 2.2 with a baseline, edit, and verify loop.

    103 GitHub stars~1.1k tokensUpdated 1 mo ago
    Auto-check: notes

Categories

Questions about Accessibility Diff

What does Accessibility Diff do?

Regression check — diff a live page's web accessibility (a11y) violations against a baseline. Accessibility Diff is an agent skill from AccessLint/skills. Regression check — diff a live page's web accessibility (a11y) violations against a baseline.

When should I use Accessibility Diff?

Accessibility Diff fits situations like: did my change break accessibility; what a11y issues did this PR add.

How do I install Accessibility Diff in Claude Code?

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

How do I install Accessibility Diff in Codex?

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

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

What does Accessibility Diff need to run?

Going by SKILL.md and its folder, Accessibility Diff needs the command-line tools its instructions call (git, npx and node). Our summary lists: Node.js. Its frontmatter pre-approves these tools: Bash, Read, Glob, Grep, Skill, Task.

Does Accessibility Diff access the network?

SKILL.md contains no URLs. Its commands use git and npx, which can reach the network depending on how they are called. This is read from the text; nothing was executed.

Is Accessibility Diff safe to install?

Our automated static check of SKILL.md found notes only (pre-approves every shell command (allowed-tools: bash)), nothing it rates as a warning. It is not a guarantee. Review the folder before installing.

What licence does Accessibility Diff use?

No licence was found for Accessibility Diff or its repository. Without one, default copyright applies: ask the author before reusing or redistributing it.

How many tokens does Accessibility Diff use?

About 1.1k tokens (SKILL.md is roughly 4.3k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.

What are the alternatives to Accessibility Diff?

Skills that share tags, products or a category with Accessibility Diff: Web Interface Guidelines Reviewer (vercel-labs/openreview, 1.7k stars), Accessibility Review (markmead/hyperui, 12k stars), Web Animation Design (baptisteArno/typebot.io, 11k stars) and Accessibility Fixer (ibelick/ui-skills, 9.4k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Accessibility Diff?

AccessLint (a GitHub organization) maintains it in AccessLint/skills, which has 103 GitHub stars. The repository holds 5 skills in this directory. The repository was last updated on August 25, 2026.

Source: AccessLint/skills on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.