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Errata

connects

apidefects.com

What is known to be broken in an MCP server or API operation, with the check that found it.

https://apidefects.com/mcpWebsiteNo authMCP 2026-07-28verrata-2026-09-10@c2ce1acdc653last checked 2 Nov 2026spoke MCP on 100% of 91 checks (30 days)initialize in 230 ms

Last checked 2 Nov 2026

  • ✓Answered the MCP handshake (MCP 2026-07-28)
  • ✓Auth detected: No auth
  • ✓Lists 1 tool
  • ✓No blockers or warnings
  • ✓Spoke MCP on 91 of 91 checks (30 days)

Will my client connect?

Decided from what the probe found at the endpoint, and from what each client's own documentation says it can complete. Every row carries the day that documentation was read.

✓Claude CodeConnects

The endpoint answers an anonymous handshake, so no credential is needed.

claude mcp add --transport http errata https://apidefects.com/mcp

Claude Code docs · read on 2026-08-30

✓Claude (claude.ai & Desktop)Connects

The endpoint answers an anonymous handshake, so no credential is needed.

Settings → Connectors → Add custom connector, then paste https://apidefects.com/mcp.

Claude (claude.ai & Desktop) docs · read on 2026-08-30

✓ChatGPTConnects

The endpoint answers an anonymous handshake, so no credential is needed.

Settings → Apps → Advanced settings → Developer mode, then create a connector pointing at https://apidefects.com/mcp.

ChatGPT docs · read on 2026-08-30

✓CursorConnects

The endpoint answers an anonymous handshake, so no credential is needed.

{
  "mcpServers": {
    "errata": {
      "url": "https://apidefects.com/mcp"
    }
  }
}

Cursor docs · read on 2026-08-30

✓VS Code (Copilot)Connects

The endpoint answers an anonymous handshake, so no credential is needed.

{
  "servers": {
    "errata": {
      "type": "http",
      "url": "https://apidefects.com/mcp"
    }
  }
}

VS Code (Copilot) docs · read on 2026-08-30

How to authenticate

Checked against the endpoint by our probe on 2 Nov 2026. These are the capabilities the server advertises, not a prediction about any particular client.

Scheme
No auth
Protected-resource metadata
✕Not found

Without it a client has to guess where the authorization server lives.

Anonymous access
Handshake succeeds; 1 tools listable

What the probe found

No CORS headers for browser-based clients

A cross-origin preflight came back without Access-Control-Allow-Origin, so the endpoint is reachable from native clients only — code running in a web page is stopped by the browser before a request is ever sent.

No server card

Neither the reserved <endpoint>/server-card location nor the domain's /.well-known/ai-catalog.json describes this endpoint (SEP-2127), so a client that discovers servers by domain will not find it.

Tools

check_defects

Contract history

1 Nov 2026verrata-2026-09-10@c2ce1acdc653no contract changes
27 Oct 2026verrata-2026-09-10@0daee1a6f207no contract changes
26 Oct 2026verrata-2026-09-10@5d7424202eaeno contract changes
25 Oct 2026verrata-2026-09-10@0399698842e8no contract changes
24 Oct 2026verrata-2026-09-10@90a0f8e164f6no contract changes
23 Oct 2026verrata-2026-09-10@2ba4d6f72b59no contract changes
22 Oct 2026verrata-2026-09-10@bdd072c63929no contract changes
21 Oct 2026verrata-2026-09-10@8caea9edd449no contract changes
20 Oct 2026verrata-2026-09-10@dcb7ccbec3ceno contract changes
19 Oct 2026verrata-2026-09-10@f072e0e97fcfno contract changes
18 Oct 2026verrata-2026-09-10@b2ea753d58d7no contract changes
17 Oct 2026verrata-2026-09-10@99df4c095a76no contract changes
16 Oct 2026verrata-2026-09-10@f669c55931ceno contract changes
15 Oct 2026verrata-2026-09-10@eee9b334c818no contract changes
14 Oct 2026verrata-2026-09-10@8944eed59e9dno contract changes
13 Oct 2026verrata-2026-09-10@f75007a90a1cno contract changes
12 Oct 2026verrata-2026-09-10@5c86af22ab2ano contract changes
11 Oct 2026verrata-2026-09-10@56859bb97051no contract changes
10 Oct 2026verrata-2026-09-10@619239a496d4no contract changes
9 Oct 2026verrata-2026-09-10@0a2759c158afno contract changes
8 Oct 2026verrata-2026-09-10@fce67a62b09bno contract changes
8 Oct 2026verrata-2026-09-10@eda637005e11no contract changes
7 Oct 2026verrata-2026-09-10@eda637005e11no contract changes
6 Oct 2026verrata-2026-09-10@5793e0fb092fno contract changes
5 Oct 2026verrata-2026-09-10@d6e9e483974eno contract changes
4 Oct 2026verrata-2026-09-10@7dad1c7dea05no contract changes
3 Oct 2026verrata-2026-09-10@6d1b5211f0beno contract changes
2 Oct 2026verrata-2026-09-10@00ed887ee176no contract changes
1 Oct 2026verrata-2026-09-10@7c454ead5ed5no contract changes
30 Sep 2026verrata-2026-09-10@88c2d138b240no contract changes
29 Sep 2026verrata-2026-09-10@e0d06d204732no contract changes
28 Sep 2026verrata-2026-09-10@1043adae80fcno contract changes
27 Sep 2026verrata-2026-09-10@76ee8bf9d436no contract changes
26 Sep 2026verrata-2026-09-10@f57ca050352dno contract changes
25 Sep 2026verrata-2026-09-10@1f4e6801bb54no contract changes
24 Sep 2026verrata-2026-09-10@c5d2c468cd43no contract changes
23 Sep 2026verrata-2026-09-10@e6a7571c3e17no contract changes
23 Sep 2026verrata-2026-09-10@603c2ea79ebano contract changes
22 Sep 2026verrata-2026-09-10@407411098063no contract changes
21 Sep 2026verrata-2026-09-10@972d2fbe2375no contract changes
21 Sep 2026verrata-2026-09-10@8175c1395b5bno contract changes
20 Sep 2026verrata-2026-09-10@8043bb7f2b70no contract changes
19 Sep 2026verrata-2026-09-10@9fbb2ece6802no contract changes
18 Sep 2026verrata-2026-09-10@b6db13342780no contract changes
18 Sep 2026verrata-2026-09-10@21cfd668f437no contract changes
17 Sep 2026verrata-2026-09-10@21826040e38afirst recorded contract

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Status badge

Status for a README, from the last probe — cached an hour, so up to seven hours behind the endpoint. Links back to this page.

MCP status badge for Errata
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