Agent skill

Kb GitHub A11y Scanner

by Community-Access in Community-Access/accessibility-agents

Reference data, not a reviewer. An agent skill from Community-Access/accessibility-agents.

MITAuto-check passedFrontend & Design

Install Kb GitHub A11y Scanner

skills CLI
$ npx skills add Community-Access/accessibility-agents --skill kb-github-a11y-scanner -a claude-code

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

GitHub CLI
$ gh skill install Community-Access/accessibility-agents kb-github-a11y-scanner --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/kb-github-a11y-scanner .claude/skills/kb-github-a11y-scanner && 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
kb-github-a11y-scanner
GitHub stars
421
Token cost
~2.4k tokens
SKILL.md length
964 words
Files
2
Skills in repo
108
Repo updated
First seen
Licence
MIT

At a glance

Reference data, not a reviewer. An agent skill from Community-Access/accessibility-agents.

  • Works in 3 steps: Author: The GitHub Actions bot that runs… → Labels: The scanner applies labels to… → Body structure: Issues contain…
  • Tasks that involve Accessibility
  • SKILL.md covers GitHub Accessibility Scanner…, What Is the GitHub…, Detecting Scanner Presence and Parsing Scanner-Created Issues, plus 5 more sections
  • Reaches github.com

What it does

Kb GitHub A11y Scanner is an agent skill from Community-Access/accessibility-agents. Reference data, not a reviewer. Integrate GitHub Accessibility Scanner. Detects configuration, parses scanner issues, correlates with local scans, and tracks Copilot-assigned fixes.

Its SKILL.md is about 2.4k tokens, which your agent loads only when the skill is triggered. The skill folder holds 2 other files (for example `agents/openai.yaml`).

It sits in Frontend & Design, covering Accessibility. It works with GitHub. 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 Accessibility

Example prompts

  • “/kb-github-a11y-scanner”

Workflow steps

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

  1. Author: The GitHub Actions bot that runs the workflow
  2. Labels: The scanner applies labels to categorize findings (typically accessibility-related labels)
  3. Body structure: Issues contain structured sections with violation details

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 bash, yaml and json).

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

  • Network

    Hosts in commands or code, which the agent is likely to contact:

    • github.com

    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

Kb GitHub A11y Scanner loads about 2.4k tokens when it runs. Until then it costs about 51 tokens; SKILL.md has 964 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~51
When it runs · the whole SKILL.md, loaded when a task matches
~2.4k

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). 964 words, ~2,397 tokens.

Download SKILL.mdSave it as .claude/skills/kb-github-a11y-scanner/SKILL.md (or your agent's skills folder). This skill also uses 1 other file; get the full folder from GitHub.
name
kb-github-a11y-scanner
description
Reference data, not a reviewer. Integrate GitHub Accessibility Scanner. Detects configuration, parses scanner issues, correlates with local scans, and tracks Copilot-assigned fixes.
license
MIT
disable-model-invocation
true
user-invocable
false
metadata.tier
reference
metadata.domain
cross-cutting
metadata.output
none
metadata.effort
low
metadata.title
Github A11y Scanner

GitHub Accessibility Scanner Integration

What Is the GitHub Accessibility Scanner?

The GitHub Accessibility Scanner (github/accessibility-scanner@v2) is an official GitHub Action that:

  • Scans live URLs for accessibility barriers using axe-core in a headless browser
  • Creates trackable GitHub Issues for each finding, with affected element, WCAG criterion, and remediation guidance
  • Optionally assigns issues to GitHub Copilot for AI-powered fix suggestions and PR creation
  • Caches results across runs for delta detection (new, fixed, persistent findings)
  • Supports authenticated scanning (login flows, SSO, passkeys via Playwright auth context)
  • Optionally captures screenshots and attaches them to filed issues

Current version: v2 (public preview)

Detecting Scanner Presence

To determine whether a repository has the GitHub Accessibility Scanner configured:

Workflow File Detection

Search for workflow files referencing the scanner action:

bash
# Search in .github/workflows/ for the scanner action reference
grep -rl "github/accessibility-scanner" .github/workflows/

Pattern to match in YAML:

yaml
- uses: github/accessibility-scanner@v2
Workflow Inputs

When a scanner workflow is found, extract its configuration:

InputRequiredDescription
urlsYesNewline-delimited list of URLs to scan
repositoryYesRepository (owner/name) where issues and PRs are created
tokenYesFine-grained PAT with write access (contents, issues, PRs, metadata)
cache_keyYesFilename for caching results across runs (e.g., cached_results-mysite.json)
login_urlNoLogin page URL for authenticated scanning
usernameNoUsername for authentication
passwordNoPassword for authentication (via repository secret)
auth_contextNoStringified JSON for complex authentication (Playwright session state)
skip_copilot_assignmentNoSet true to skip assigning issues to Copilot
include_screenshotsNoSet true to capture screenshots (stored on gh-cache branch)

Parsing Scanner-Created Issues

The scanner creates GitHub Issues with a structured format. Agents should parse these fields:

Issue Identification

Scanner-created issues can be identified by:

  1. Author: The GitHub Actions bot that runs the workflow
  2. Labels: The scanner applies labels to categorize findings (typically accessibility-related labels)
  3. Body structure: Issues contain structured sections with violation details
Issue Body Structure

Scanner issues typically contain:

SectionContentAgent Use
Violation titleThe axe-core rule that was violatedMap to help-url-reference for remediation docs
WCAG criterionThe specific WCAG success criterionUsed for severity scoring and compliance mapping
Affected elementCSS selector or HTML snippet of the failing elementUsed by scanner-bridge to map to source code
Impact levelCritical, Serious, Moderate, or MinorDirect mapping to agent severity model
Remediation guidanceHow to fix the issueEnriched by agent specialists with framework-specific fixes
URLThe page URL where the issue was foundUsed for cross-referencing with local axe-core scans
Screenshot linkLink to screenshot on gh-cache branch (if enabled)Included in audit reports
Severity Mapping

The scanner uses axe-core impact levels that map directly to the agent severity model:

Scanner ImpactAgent SeverityScore Weight
CriticalCritical-15 (both sources) / -10 (single source)
SeriousSerious-7 (high confidence)
ModerateModerate-3 (high confidence)
MinorMinor-1
axe-core Rule Correlation

The scanner uses axe-core under the hood. Scanner issue titles and violation IDs correspond to axe-core rules already cataloged in help-url-reference. Common scanner-reported rules:

axe-core Rule IDWCAG CriterionCommon Description
image-alt1.1.1Images must have alternate text
label1.3.1Form elements must have labels
color-contrast1.4.3Elements must have sufficient color contrast
link-name2.4.4Links must have discernible text
html-has-lang3.1.1<html> element must have a lang attribute
button-name4.1.2Buttons must have discernible text
document-title2.4.2Documents must have <title> element
bypass2.4.1Page must have means to bypass repeated blocks
heading-order1.3.1Heading levels should increase by one
aria-allowed-attr4.1.2ARIA attributes must be allowed for element role
Show full SKILL.md (403 more words)Show less

Caching and Delta Detection

The scanner uses a cache_key to persist results across workflow runs. This enables delta tracking:

StatusMeaning
NewIssue found in current scan but not in cached results
FixedIssue in cached results but not found in current scan (issue auto-closed)
PersistentIssue found in both current scan and cached results
Cache Key Conventions

When setting up scanner integration, align the cache key with agent conventions:

  • Use a descriptive name: cached_results-{domain}-{branch}.json
  • Include branch context for branch-specific scanning
  • The cache is stored as a GitHub Actions artifact

Correlation with Local Scans

Dual-Source Confidence Boosting

When both the GitHub Accessibility Scanner (CI) and a local axe-core scan (agent) find the same issue:

  1. Match by rule ID: Both sources use axe-core rule IDs (e.g., color-contrast, image-alt)
  2. Match by URL: Compare the scanned URL from the scanner issue with the local scan target
  3. Match by element: Compare CSS selectors or HTML paths for the affected element
  4. Boost confidence: Findings confirmed by both sources automatically receive high confidence
Source Comparison Analysis

Each scenario, with its interpretation and action.

ScenarioInterpretationAction
Found by scanner AND local scanHigh confidence -- confirmed by bothReport as high confidence, full severity weight
Found by scanner onlyEnvironment-specific or intermittentReport as medium confidence, note "CI-only finding"
Found by local scan onlyNew since last CI scan, or local-only conditionReport as medium confidence, note "local-only finding"
In scanner cache as "fixed"Recently remediatedTrack in delta section as resolved

Copilot Fix Tracking

When the scanner assigns issues to GitHub Copilot:

Fix Lifecycle

Each stage, with GitHub state and how to detect.

StageGitHub StateHow to Detect
Issue createdOpen issue, assigned to Copilotassignee includes Copilot bot
Fix proposedOpen PR linked to issuePR references issue number, author is Copilot
Fix reviewedPR has review commentsPR review state is CHANGES_REQUESTED or APPROVED
Fix mergedPR merged, issue closedIssue state is closed, linked PR is merged
Fix rejectedPR closed without mergePR state is closed, not merged
Querying Copilot Fix Status
text
# Find scanner issues assigned to Copilot
repo:{REPO} is:issue is:open assignee:copilot label:accessibility

# Find Copilot PRs from scanner issues
repo:{REPO} is:pr author:copilot-swe-agent label:accessibility

# Find merged scanner fixes
repo:{REPO} is:pr is:merged author:copilot-swe-agent label:accessibility

Structured Output Format

When scanner-bridge normalizes scanner issue data, it produces findings in this format:

json
{
  "source": "github-a11y-scanner",
  "ruleId": "color-contrast",
  "wcagCriterion": "1.4.3",
  "wcagLevel": "AA",
  "severity": "serious",
  "confidence": "high",
  "url": "https://example.com/login",
  "element": "button.submit-btn",
  "description": "Element has insufficient color contrast ratio of 3.2:1 (expected 4.5:1)",
  "remediation": "Change the text color or background to achieve at least 4.5:1 contrast ratio",
  "githubIssue": {
    "number": 42,
    "url": "https://github.com/owner/repo/issues/42",
    "state": "open",
    "copilotAssigned": true,
    "fixPR": null
  },
  "screenshot": "https://github.com/owner/repo/blob/gh-cache/screenshots/login-contrast.png"
}

Search Patterns for Scanner Issues

By Repository
text
repo:{OWNER}/{REPO} is:issue label:accessibility created:>{YYYY-MM-DD}
By Scan Run

Issues from a specific scan run share the same creation timestamp and batch pattern. Filter by:

  • Creation date matching the workflow run date
  • Common label set applied by the scanner
Cross-Repository Scanner Discovery
text
user:{USERNAME} is:issue label:accessibility sort:created-desc
org:{ORGNAME} is:issue label:accessibility sort:created-desc

© 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 1 other file in skills/kb-github-a11y-scanner of Community-Access/accessibility-agents.

  • SKILL.md
  • agents/openai.yaml

Open the folder on GitHubat commit decf6ba

Compare with similar skills

Kb GitHub A11y Scanner 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.

Kb GitHub A11y Scanner compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Kb GitHub A11y Scanner this skillCommunity-Access/accessibility-agents421—~2.4kAutomated safety check: PassMIT
OpenClaw Design Auditopenclaw/clawhub9.5k—~498Automated safety check: PassMIT
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

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Works with

Questions about Kb GitHub A11y Scanner

What does Kb GitHub A11y Scanner do?

Reference data, not a reviewer. An agent skill from Community-Access/accessibility-agents. Kb GitHub A11y Scanner is an agent skill from Community-Access/accessibility-agents. Reference data, not a reviewer.

When should I use Kb GitHub A11y Scanner?

Kb GitHub A11y Scanner fits situations like: tasks that involve Accessibility.

How do I install Kb GitHub A11y Scanner in Claude Code?

Run `npx skills add Community-Access/accessibility-agents --skill kb-github-a11y-scanner -a claude-code`. Or copy the skill folder (skills/kb-github-a11y-scanner in Community-Access/accessibility-agents) into .claude/skills/kb-github-a11y-scanner in your project. Claude Code loads it when a task matches its description.

How do I install Kb GitHub A11y Scanner in Codex?

Run `npx skills add Community-Access/accessibility-agents --skill kb-github-a11y-scanner -a codex`. Or copy the skill folder (skills/kb-github-a11y-scanner in Community-Access/accessibility-agents) into .agents/skills/kb-github-a11y-scanner in your project. Codex loads it when a task matches its description.

Can I use Kb GitHub A11y Scanner 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 kb-github-a11y-scanner -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/kb-github-a11y-scanner, .gemini/skills/kb-github-a11y-scanner, .github/skills/kb-github-a11y-scanner and .opencode/skills/kb-github-a11y-scanner in your project.

What does Kb GitHub A11y Scanner need to run?

SKILL.md names no scripts, command-line tools or credentials: Kb GitHub A11y Scanner is instructions for the agent only.

Does Kb GitHub A11y Scanner access the network?

SKILL.md names 1 domain. In commands or code: github.com; the agent is likely to contact it when it follows the instructions. This is read from the text; nothing was executed.

Is Kb GitHub A11y Scanner 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 Kb GitHub A11y Scanner use?

Kb GitHub A11y Scanner 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 Kb GitHub A11y Scanner use?

About 2.4k tokens (SKILL.md is roughly 9.6k 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 Kb GitHub A11y Scanner?

Skills that share tags, products or a category with Kb GitHub A11y Scanner: OpenClaw Design Audit (openclaw/clawhub, 9.5k stars), Web Interface Guidelines Reviewer (vercel-labs/openreview, 1.7k stars), Accessibility Review (markmead/hyperui, 12k stars) and Web Animation Design (baptisteArno/typebot.io, 11k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Kb GitHub A11y Scanner?

Community-Access (a GitHub organization) maintains it in Community-Access/accessibility-agents, which has 421 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.