Umlout MCP Server

by dmkorj Your server? Claim it

answering

Umlout is answering right now. Last checked 1 min ago. Last commit 6 Oct 2026.

Build Umlout projects: objects with types and fields, relations, and boards that draw them.

Uptime history 84 days of history · worst day 99%

84 days agonow

100.0%

Uptime 24h

184 of 184 checks

—

Tools

hidden behind auth

618 ms

Response time

average over 24h

Stars

last commit 6 Oct 2026

Nothing serious here today

Today is the operative word: we check Umlout every 15 minutes and re-read its code on every release. Watch it and you find out the day that stops being true.

Connect this server

Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 1 min ago.

Claude Code Claude Desktop Codex Cursor VS Code

run in your terminal

claude mcp add umlout --transport sse https://www.umlout.com/mcp/sse

Settings → Connectors → Add custom connector, then paste this address

https://www.umlout.com/mcp/sse

~/.codex/config.toml

[mcp_servers.umlout]
url = "https://www.umlout.com/mcp/sse"

.cursor/mcp.json

{
  "mcpServers": {
    "umlout": {
      "url": "https://www.umlout.com/mcp/sse"
    }
  }
}

.vscode/mcp.json

{
  "servers": {
    "umlout": {
      "type": "sse",
      "url": "https://www.umlout.com/mcp/sse"
    }
  }
}

This endpoint answered with an authorization challenge. The server is running, and it signs you in through your browser: there is no API key to paste.

This server publishes 1 more address. The block above uses the one we reach during checks; the full list is under Endpoints below, and the author may intend a particular one for your client.

Endpoints

URL	Transport	State	Latency	Checked
https://www.umlout.com/mcp/sse	sse	sign-in	647 ms	1 min ago
https://www.umlout.com/mcp/http	streamable-http	sign-in	642 ms	1 min ago

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Umlout — questions

Answers built from our own checks of this server.

Why is there no tool list for Umlout?

The server answered our handshake with an authorization challenge, so it is running — but it will not describe its tools to an anonymous client. To see them you need to connect with your own credentials. We record it as alive, not as broken: 100.0% of checks in the last 24 hours got a reply.

Is Umlout working right now?

We send a real MCP handshake every 15 minutes. Over the last 24 hours 184 of 184 checks got a reply (100.0%), average response time 618 ms. The bar chart above shows every period we have measured.

How do I connect Umlout?

Copy the ready config from this page. We generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each in the form that client actually reads. It is a remote server, so there is nothing to install — the client connects to the address. You sign in through your browser once and the client keeps the session: no key to copy, and it refuses anonymous clients.

How do you sign in to Umlout?

No API key is involved. Umlout answers our knock with an OAuth challenge, so you authorise it once in your browser and the client keeps the session. That is also why we see no tool list: it will not describe itself to an anonymous client, and that is the server working as intended, not a fault.

How fast is Umlout?

It answers our handshake in 618 ms on average, which is faster than 17% of all working MCP servers we measure. That is on the slow side — worth knowing if the tool sits inside an interactive loop. The comparison comes from our own checks across the whole registry, every 15 minutes.

Is Umlout open source?

The code is open source: it is published under the MIT licence, written in Python and 0 stars on GitHub. The licence covers the code in the repository, not the hosted service at umlout.com, which runs on its operator's own terms.