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TypoSafe AI — Jef

warnings

typosafe.lol

Jef decides. Give it options, it returns one with a confidence, never a sentence. A parody.

https://typosafe.lol/mcpWebsiteUnknownMCP 2025-06-18v0.4.5last checked 3 Nov 2026spoke MCP on 100% of 88 checks (30 days)initialize in 42 ms

Last checked 3 Nov 2026

✓Answered the MCP handshake (MCP 2025-06-18)
–Auth scheme could not be determined
✓Lists 5 tools
!1 warning
✓Spoke MCP on 88 of 88 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 CodeUnknown

The handshake was refused with no challenge and no OAuth metadata, so what this server wants is not something the probe could record.

Claude Code docs · read on 2026-08-30

–Claude (claude.ai & Desktop)Unknown

The handshake was refused with no challenge and no OAuth metadata, so what this server wants is not something the probe could record.

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

–ChatGPTUnknown

The handshake was refused with no challenge and no OAuth metadata, so what this server wants is not something the probe could record.

ChatGPT docs · read on 2026-08-30

–CursorUnknown

The handshake was refused with no challenge and no OAuth metadata, so what this server wants is not something the probe could record.

Cursor docs · read on 2026-08-30

–VS Code (Copilot)Unknown

The handshake was refused with no challenge and no OAuth metadata, so what this server wants is not something the probe could record.

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

How to authenticate

Checked against the endpoint by our probe on 3 Nov 2026. These are the capabilities the server advertises, not a prediction about any particular client.

Scheme	Unknown
Protected-resource metadata	✕Not found Without it a client has to guess where the authorization server lives.
Anonymous access	Refused — credentials required

What the probe found

warningThe server refused to initialize

It speaks JSON-RPC but rejected the handshake: {"code":"503","message":"The deployment is currently unavailable"}

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

jef_flagjef_pickjef_rankjef_scorejef_yes_no

Contract history

19 Sep 2026v0.4.5first recorded contract

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Route it through the gateway

Put this endpoint behind one find_tools / call_tool pair with the rest of your servers. Part of Pro.

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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](https://mcpi.app/servers/typosafe-ai-jef/badge.svg)](https://mcpi.app/servers/typosafe-ai-jef)