mcpbeat

Nexus MCP Server

io.github.nexus-api-lab/nexus-mcp
not responding

Nexus MCP is listed as active in the registry but did not answer our last check. Last commit 16 Apr 2026.

Japanese LLM security — prompt injection detection (jpi-guard) + PII masking (PII Guard). Free.

Uptime history 42 hours of history · worst hour 0%
42 hours agonow
0.0%
Uptime 24h
0 of 91 checks
—
Tools
hidden behind auth
43 ms
Response time
average over 24h
0
Stars
last commit 16 Apr 2026

Connect this server

Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 4 min ago.

run in your terminal
claude mcp add nexus-mcp --transport http https://mcp.nexus-api-lab.com/
~/Library/Application Support/Claude/claude_desktop_config.json
{
  "mcpServers": {
    "nexus-mcp": {
      "url": "https://mcp.nexus-api-lab.com/"
    }
  }
}
~/.codex/config.toml
[mcp_servers.nexus-mcp]
url = "https://mcp.nexus-api-lab.com/"
.cursor/mcp.json
{
  "mcpServers": {
    "nexus-mcp": {
      "url": "https://mcp.nexus-api-lab.com/"
    }
  }
}
.vscode/mcp.json
{
  "mcpServers": {
    "nexus-mcp": {
      "url": "https://mcp.nexus-api-lab.com/"
    }
  }
}

Endpoints

URLTransportStateLatencyChecked
https://mcp.nexus-api-lab.com/ streamable-http answering 43 ms 4 min ago

Nexus MCP — questions

Answers built from our own checks of this server.

Is Nexus MCP working right now?
We send a real MCP handshake every 15 minutes. Over the last 24 hours 0 of 91 checks got a reply (0.0%), average response time 43 ms. The bar chart above shows every period we have measured.
The registry lists Nexus MCP 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 Nexus MCP?
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.
Does Nexus MCP need an API key?
No. Nexus MCP 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.
Is Nexus MCP open source?
Yes — it is published under the MIT licence 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.