Nexus MCP Server

by nexus-api-lab Your server? Claim it

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 51 days of history · worst day 0%

51 days agonow

0.0%

Uptime 24h

0 of 91 checks

—

Tools

hidden behind auth

17 ms

Response time

average over 24h

Stars

last commit 16 Apr 2026

Nexus MCP does not always answer

Over the last week it answered 0.0% 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 0 min ago.

Claude Code Claude Desktop Codex Cursor VS Code

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

URL	Transport	State	Latency	Checked
https://mcp.nexus-api-lab.com/	streamable-http	answering	17 ms	0 min ago

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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 17 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.