Is io.github.nexus-api-lab/nexus-mcp safe to use?

io.github.nexus-api-lab/nexus-mcp has no known CVEs as of the latest MCPpedia security scan. It does not require authentication, so any local process can connect — keep this in mind in shared environments.

How do I install io.github.nexus-api-lab/nexus-mcp?

io.github.nexus-api-lab/nexus-mcp supports copy-paste install configs on its MCPpedia page for Claude Desktop, Cursor, and Claude Code. Scroll to the Quick Install section and select your client.

Is io.github.nexus-api-lab/nexus-mcp actively maintained?

io.github.nexus-api-lab/nexus-mcp is actively maintained — last commit was 2 days ago.

io.github.nexus-api-lab/nexus-mcp

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

ActiveNot tested

AI / ML

GitHub

29DNo CVEsactive

Quick Install

{
  "mcpServers": {
    "nexus-mcp": {
      "url": "https://mcp.nexus-api-lab.com/",
      "type": "http"
    }
  }
}

Setup guide

Are you the author?

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[![MCPpedia Score](https://mcppedia.org/api/badge/io-github-nexus-api-lab-nexus-mcp)](https://mcppedia.org/s/io-github-nexus-api-lab-nexus-mcp)

Should you use this server?

LLM security APIs for Japanese applications, available as an MCP server.

✓

Is it safe?

No package registry to scan.

No authentication — any process on your machine can connect.

License not specified.

✓

Is it maintained?

Last commit 2 days ago.

Will it work with my client?

Transport: http. Compatibility not confirmed.

README

nexus-mcp — jpi-guard & PII Guard MCP Server

LLM security APIs for Japanese applications, available as an MCP server.

MCP endpoint: https://mcp.nexus-api-lab.com/
Transport: HTTP (Streamable HTTP / JSON-RPC 2.0)
Homepage: https://www.nexus-api-lab.com
Discovery: https://mcp.nexus-api-lab.com/.well-known/mcp.json

Quick connect

Claude Code / Claude Desktop

claude mcp add --transport http nexus-mcp https://mcp.nexus-api-lab.com/

Or add to your .mcp.json:

{
  "mcpServers": {
    "nexus-mcp": {
      "type": "http",
      "url": "https://mcp.nexus-api-lab.com/"
    }
  }
}

Cursor / Windsurf / other MCP clients

Add to your MCP config:

{
  "nexus-mcp": {
    "transport": "http",
    "url": "https://mcp.nexus-api-lab.com/"
  }
}

Tools

jpi-guard — Prompt Injection Detection

Tool	Description
`check_injection`	Detect prompt injection in user input. Specialized for Japanese (全角バイパス, 丁寧語擬装, indirect injection).
`validate_rag_input`	Gate check before passing input to RAG/LLM pipeline. Returns `safe: true/false`.
`sanitize_content`	Sanitize external content fetched from the web before passing to LLM.
`get_trial_key`	Get a free jpi-guard API key (2,000 req / 30 days, no signup).

Free trial: https://www.nexus-api-lab.com/jpi-guard.html

PII Guard — Japanese PII Detection & Masking

Tool	Description
`pii_scan`	Scan Japanese text for 10 PII categories. Returns `findings[]` + `masked_text` with `[TYPE]` placeholders. No LLM — pure regex + checksum.
`get_pii_guard_key`	Register email and get a free PII Guard key (10,000 req/month, permanent free tier).

PII categories: My Number (mod-11), credit card (Luhn), bank account, passport, phone, email, postal address, date of birth, driver's license, person name.

Free tier: https://www.nexus-api-lab.com/pii-guard.html

Why use this instead of writing your own?

Japanese-specialized — full-width character normalization, polite-language disguise detection, My Number checksum validation
Deterministic — no LLM calls inside the API. Fast, auditable, consistent results
Free to start — no credit card, no signup for trial keys
Edge-deployed — Cloudflare Workers global network, sub-50ms p99

License

MIT — see LICENSE

Test This Server

No automated test available for this server. Check the GitHub README for setup instructions.

Score Breakdown

MCPpedia Score

Click each category to see evidence

29D

Last scored 9h ago

How we score →

Security

2/30

No known vulnerabilities.

○

Known CVEs — No package registry to scan

○

Tool safety — No tools to analyze

○

Tool poisoning — No tools to analyze

○

Injection vectors — No tools to analyze

○

Tool stability — First scan — baseline recorded

○

Dependency health — No package to analyze

✗

License — No license specified

○

Authentication — No authentication required

○

Repository — active repo

CVEs checked daily via OSV.dev. Score algorithm is open source.

Reviews

Have you used this server?

Share your experience — it helps other developers decide.

How easy was setup?Did it work reliably?How was the documentation?

Frequently Asked Questions

Is io.github.nexus-api-lab/nexus-mcp safe to use?: io.github.nexus-api-lab/nexus-mcp has no known CVEs as of the latest MCPpedia security scan. It does not require authentication, so any local process can connect — keep this in mind in shared environments.
How do I install io.github.nexus-api-lab/nexus-mcp?: io.github.nexus-api-lab/nexus-mcp supports copy-paste install configs on its MCPpedia page for Claude Desktop, Cursor, and Claude Code. Scroll to the Quick Install section and select your client.
Is io.github.nexus-api-lab/nexus-mcp actively maintained?: io.github.nexus-api-lab/nexus-mcp is actively maintained — last commit was 2 days ago.

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Discussion

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Ask a question, share a tip, or report an issue.

Has anyone used this with Cursor?How do you handle auth?Any alternatives?

nexus-mcp — jpi-guard & PII Guard MCP Server

LLM security APIs for Japanese applications, available as an MCP server.

Quick connect

Claude Code / Claude Desktop

claude mcp add --transport http nexus-mcp https://mcp.nexus-api-lab.com/

Or add to your .mcp.json:

{
  "mcpServers": {
    "nexus-mcp": {
      "type": "http",
      "url": "https://mcp.nexus-api-lab.com/"
    }
  }
}

Cursor / Windsurf / other MCP clients

Add to your MCP config:

{
  "nexus-mcp": {
    "transport": "http",
    "url": "https://mcp.nexus-api-lab.com/"
  }
}

Tools

jpi-guard — Prompt Injection Detection

Tool	Description
`check_injection`	Detect prompt injection in user input. Specialized for Japanese (全角バイパス, 丁寧語擬装, indirect injection).
`validate_rag_input`	Gate check before passing input to RAG/LLM pipeline. Returns `safe: true/false`.
`sanitize_content`	Sanitize external content fetched from the web before passing to LLM.
`get_trial_key`	Get a free jpi-guard API key (2,000 req / 30 days, no signup).

Free trial: https://www.nexus-api-lab.com/jpi-guard.html

PII Guard — Japanese PII Detection & Masking

Tool	Description
`pii_scan`	Scan Japanese text for 10 PII categories. Returns `findings[]` + `masked_text` with `[TYPE]` placeholders. No LLM — pure regex + checksum.
`get_pii_guard_key`	Register email and get a free PII Guard key (10,000 req/month, permanent free tier).

PII categories: My Number (mod-11), credit card (Luhn), bank account, passport, phone, email, postal address, date of birth, driver's license, person name.

Free tier: https://www.nexus-api-lab.com/pii-guard.html

Why use this instead of writing your own?

Japanese-specialized — full-width character normalization, polite-language disguise detection, My Number checksum validation
Deterministic — no LLM calls inside the API. Fast, auditable, consistent results
Free to start — no credit card, no signup for trial keys
Edge-deployed — Cloudflare Workers global network, sub-50ms p99

License

MIT — see LICENSE