Underlayer MCP Server

by underlayerhq Your server? Claim it

not responding

Underlayer is listed as active in the registry but did not answer our last check.

Build, publish and track embedded training courses in your product: courses, learners, SCORM.

Uptime history 43 days of history · worst day 0%

43 days agonow

7.7%

Uptime 24h

7 of 91 checks

—

Tools

hidden behind auth

957 ms

Response time

average over 24h

open, no key

Access

streamable-http

Underlayer does not always answer

Over the last week it answered 2.3% of our checks. We check every 15 minutes, so you hear about the next outage within the hour — not from your users.

Connect this server

Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 8 min ago.

Claude Code Claude Desktop Codex Cursor VS Code

run in your terminal

claude mcp add underlayer --transport http https://underlayerhq.com/api/mcp

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

https://underlayerhq.com/api/mcp

~/.codex/config.toml

[mcp_servers.underlayer]
url = "https://underlayerhq.com/api/mcp"

.cursor/mcp.json

{
  "mcpServers": {
    "underlayer": {
      "url": "https://underlayerhq.com/api/mcp"
    }
  }
}

.vscode/mcp.json

{
  "servers": {
    "underlayer": {
      "type": "http",
      "url": "https://underlayerhq.com/api/mcp"
    }
  }
}

Endpoints

URL	Transport	State	Latency	Checked
https://underlayerhq.com/api/mcp	streamable-http	answering	100 ms	8 min ago

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Underlayer — questions

Answers built from our own checks of this server.

Is Underlayer working right now?

We send a real MCP handshake every 15 minutes. Over the last 24 hours 7 of 91 checks got a reply (7.7%), average response time 957 ms. The bar chart above shows every period we have measured.

The registry lists Underlayer as active — why does it not respond?

The official MCP registry stores what the author submitted; it does not verify that the server still runs. We check the endpoint ourselves, and this one does not answer. Catalogues that copy the registry without checking will show it as working.

How do I connect Underlayer?

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.

Does Underlayer need an API key?

No. Underlayer completed a full MCP handshake with us as an anonymous client and listed its tools without asking for anything. This is what we observed, not what the docs claim.

How fast is Underlayer?

It answers our handshake in 957 ms on average, which is faster than 5% 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.