Lazynext Accessibility Checker MCP server

Accessibility Checker

Real WCAG 2.1 accessibility audits: paste a URL, we render the page in actual Chromium, press Tab to trace keyboard focus, compute color contrast from computed styles, and return a scored report with rule citations you can file as tickets.

Live: https://checker.lazynext.com/ API: https://accessibility-checker.dry-hall-6a50.workers.dev

curl -X POST https://accessibility-checker.dry-hall-6a50.workers.dev/scan \
  -H 'content-type: application/json' \
  -d '{"url": "https://yoursite.com", "license": "you@example.com", "email_report": true}'
# → {"score": 70, "score_model": "weighted-v1", "issues": [{"rule": "wcag-1.3.1", ...}],
#    "rendered": true, "benchmark": {"pct": 61, "sites": 128},
#    "report": ".../report/<id>"}

The score is severity-weighted: confirmed WCAG level-A failures count in full, AA/AAA findings progressively less, warn-class heuristics at half, and repeat occurrences of the same rule at half marginal cost — a page full of minor nits outscores one with a few blocking failures.

Endpoints: POST /scan (html or url; {"url": ..., "site": true} crawls same-origin pages — 3 free / 10 Pro — and returns per-page scores; real-site scans also return benchmark — where the score ranks vs the corpus of sites scanned by this tool, shown once ≥10 sites are in), GET /checkout (trial → paid), POST /cancel (self-service cancellation by purchase email), POST /lead (email capture), GET /report/:id (shareable report — ?level=A|AA|AAA|BP, ?rule=, ?by=page views; CSV/JSON/PDF exports honor them), GET /badge/:id.svg (embeddable score badge for a report), GET /rules (the coverage manifest — 74 WCAG criteria + 1 best-practice check; name, level, WCAG version, and detection path for every check emitted; Accept: text/html returns a browsable catalog, JSON is the default), GET /openapi.json (OpenAPI 3.1 contract for the whole REST surface), POST /monitor / GET /monitor?license= / DELETE /monitor (Pro daily monitoring — platform rescans each registered URL and emails a Brevo alert when a page's score drops ≥ 10 points), GET /health.

Agent surfaces

tools/call; GET is 405, no SSE). Tools: scanurl, scanhtml, getreport, listrules. Add to an MCP client: {"mcpServers": {"a11y": {"url": "https://checker.lazynext.com/mcp"}}}

• MCP — POST /mcp, JSON-RPC 2.0 (initialize, tools/list,

handles message/send (send a text part containing a URL or HTML), tasks/send (alias), and tasks/get (the task id is the persisted report id). Scans return as completed tasks with the report artifact.

• A2A — agent card at GET /.well-known/agent.json; POST /a2a

data-target="#el"> mounts a Shadow-DOM scan box anywhere; optional data-license="buyer@x.com" for Pro.

• Widget — <script src="https://checker.lazynext.com/widget.js"

and persist the same 30-day reports.

• Scans through MCP/A2A share the /scan free quota (3 URL scans/day/IP)

SDKs + CLI

import { AccessibilityChecker } from './sdk/js/index.js';
const a11y = new AccessibilityChecker({ license: 'buyer@x.com' }); // license optional
const { score, issues, report } = await a11y.scan({ url: 'https://example.com' });
await a11y.site('https://example.com');   // same-origin crawl
await a11y.report(id);                     // stored report object (.json export)
await a11y.reportCsv(id);                  // CSV export
await a11y.rules();                        // full coverage manifest

c := checker.New("buyer@x.com")            // license optional
res, err := c.Scan(checker.ScanOptions{URL: "https://example.com"})
rep, _ := c.Report(id)                     // stored report object (.json export)
rules, _ := c.Rules()

from lazynext_a11y import AccessibilityChecker   # sdk/python, stdlib only
c = AccessibilityChecker(license="buyer@x.com")  # license optional
res = c.scan(url="https://example.com")

Shortened. The full README is on GitHub.