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io.github.mertcanvural/overlayrisk-witness

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Independent before/after accessibility-overlay (accessiBe/UserWay) witness for any public URL.

Source code Website Documentation

Install

Add this to your client's MCP configuration (Claude Desktop: claude_desktop_config.json; Cursor: .cursor/mcp.json; VS Code and others use the same "mcpServers" shape).

NPM package overlayrisk-witness-mcp
Claude Code 
claude mcp add overlayrisk-witness -e 'OVERLAYRISK_API_URL=<OVERLAYRISK_API_URL>' -- npx -y overlayrisk-witness-mcp@0.1.0
JSON configuration (Claude Desktop, Cursor, VS Code) 
{
    "mcpServers": {
        "overlayrisk-witness": {
            "command": "npx",
            "args": [
                "-y",
                "overlayrisk-witness-mcp@0.1.0"
            ],
            "env": {
                "OVERLAYRISK_API_URL": "<OVERLAYRISK_API_URL>"
            }
        }
    }
}

Environment variables

  • OVERLAYRISK_API_URL Override the hosted witness endpoint (defaults to https://overlayrisk.com/api/witness).

Documentation

From the project's README on GitHub, refreshed weekly. Links open on GitHub.

Contents
  1. OverlayRiskWitness MCP server
  2. What this server is (and isn't)
  3. Tool
  4. Install
  5. Configuration
  6. Develop
  7. License

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
SuccessThe 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):

npx overlayrisk-witness-mcp

The process speaks MCP over stdio.

Claude Desktop / Cursor / other MCP clients

Add to your client's MCP config:

{
  "mcpServers": {
    "overlayrisk-witness": {
      "command": "npx",
      "args": ["-y", "overlayrisk-witness-mcp"]
    }
  }
}

Configuration

Env varDefaultPurpose
OVERLAYRISK_API_URLhttps://overlayrisk.com/api/witnessOverride the witness endpoint (e.g. for local dev)
OVERLAYRISK_TIMEOUT_MS200000Request timeout in ms

No API key is required — the free one-page witness is public.

Develop

npm install
npm run smoke   # offline handshake test (lists tools, no network)
npm start       # run the server on stdio

License

MIT © Mert Can Vural

Frequently asked questions

What is io.github.mertcanvural/overlayrisk-witness?

Independent before/after accessibility-overlay (accessiBe/UserWay) witness for any public URL.

How do I install io.github.mertcanvural/overlayrisk-witness?

It runs on your machine. In Claude Code: claude mcp add overlayrisk-witness -e 'OVERLAYRISK_API_URL=<OVERLAYRISK_API_URL>' -- npx -y overlayrisk-witness-mcp@0.1.0. For other clients, paste the JSON configuration from this page into their MCP settings.

Does io.github.mertcanvural/overlayrisk-witness need an API key?

Its registry entry lists no required key or secret. Some features may still need an account with the service it connects to.

Is io.github.mertcanvural/overlayrisk-witness open source?

Yes. Its code is on GitHub under the MIT license.

Who maintains io.github.mertcanvural/overlayrisk-witness?

It is published by mertcanvural. AI.tn lists it but does not maintain or endorse it.

From the official MCP Registry. Listing is not an endorsement: review a server's code and permissions before giving it access to your data.