Independent before/after accessibility-overlay (accessiBe/UserWay) witness for any public URL.
Quick Install
Automated & IDE SetupCopy the AI prompt to install this server into Claude Code, Cursor, or another agent — or use 1-click editor setup below.
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Manual Client & Custom JSON ConfigExpand JSON ▾
Client Config & Setup
Choose your client or environment
Target File:
💡 Paste the JSON block into your client's configuration file under mcpServers, then restart the application.
Documentation Overview
OverlayRiskWitness MCP server
A Model Context Protocol server that runs the free, independent before/after accessibility-overlay witness from OverlayRiskWitness on any public URL.
Accessibility overlay widgets (accessiBe, UserWay, and similar) are sold as one-line ADA/WCAG compliance fixes, but independent testing routinely shows the underlying page is unchanged for real assistive-technology users. This server lets an AI agent run the witness: it loads a page with the overlay on, then off, captures both states, and returns one documented finding where the page's public accessibility/compliance claims don't hold up — with a UTC timestamp.
Findings are evidence, not a legal compliance ruling. This server is independent of accessiBe and UserWay; it tests their effect, it does not sell or defend an overlay.
What this server is (and isn't)
This is a thin client. It contains no scanning logic and no secrets. Its single
tool POSTs to the hosted API at https://overlayrisk.com/api/witness, which does the real
work (overlay detection, headless before/after capture, claim extraction). The full
timestamped Risk Packet is a paid checkout on the website — see
overlayrisk.com/pricing. The MCP server is a free
funnel; it never handles payment.
Tool
witness_page
| Input | { "url": "https://example.com/checkout" } — a public HTTP/HTTPS page URL |
| Success | The free-witness JSON: runId, siteUrl, overlayVendor (accessibe/userway), pagesTested, claimsTested, didNotHoldUp, freeFinding, lockedFindingCount — plus a note linking to the paid Risk Packet |
| Error | { status, code, error } (e.g. overlay_no_effect, page_fetch_failed, witness_timeout) |
A single witness run can take up to ~3 minutes on cold/heavy sites. That exceeds many
MCP clients' default 60s request timeout. The server emits periodic progress
notifications, so clients that honor resetTimeoutOnProgress stay connected
automatically; clients that don't should raise their per-request timeout.
Install
Run directly with npx (no global install):
The process speaks MCP over stdio.
Claude Desktop / Cursor / other MCP clients
Add to your client's MCP config:
Configuration
| Env var | Default | Purpose |
|---|---|---|
OVERLAYRISK_API_URL | https://overlayrisk.com/api/witness | Override the witness endpoint (e.g. for local dev) |
OVERLAYRISK_TIMEOUT_MS | 200000 | Request timeout in ms |
No API key is required — the free one-page witness is public.
Develop
License
MIT © Mert Can Vural
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Frequently Asked Questions about Overlayrisk Witness
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