Umlout MCP Server

by dmkorj Your server? Claim it

answering

Umlout is answering right now. Last checked 10 min ago. Last commit 11 Aug 2026.

Create and edit UML, flowchart, wireframe and sequence diagrams on an Umlout whiteboard.

Uptime history 30 days of history

30 days agonow

100.0%

Uptime 24h

92 of 92 checks

—

Tools

hidden behind auth

640 ms

Response time

average over 24h

Stars

last commit 11 Aug 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 10 min ago.

Claude Code Claude Desktop Codex Cursor VS Code

run in your terminal

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

~/Library/Application Support/Claude/claude_desktop_config.json

{
  "mcpServers": {
    "umlout": {
      "url": "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

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

This endpoint answered with an authorization challenge — the server is running, but you need an API key or OAuth to use it.

Endpoints

URL	Transport	State	Latency	Checked
https://www.umlout.com/mcp/sse	sse	needs key	674 ms	10 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 92 of 92 checks got a reply (100.0%), average response time 640 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 with the file path that client actually reads. It is a remote server, so there is nothing to install — the client connects to the address. You will need your own key: it refuses anonymous clients.

Does Umlout need an API key?

Yes. Every time we knock, Umlout answers with an authorization challenge instead of its tool list — that is how we know it is running and gated rather than broken. Bring your own credentials and it will talk.

How fast is Umlout?

It answers our handshake in 640 ms on average, which is faster than 22% 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?

Yes — it is published under the MIT licence, written in Python and 0 stars on GitHub. The source link is on this page, so you can read exactly what it does with your data before you connect it.