nexus-mcp-agent

MCP server · npm · graded 2026-10-20Source linked

Agentic OS MCP Server — 150+ tools with on-demand loading (26 core), Streamable HTTP transport, background task engine, browser automation, TF-IDF semantic memory, multi-agent orchestration. Zero API keys.

No outside reports on file

nexus-mcp-agent fetches arbitrary web URLs; restrict its folder reach, network access, and credentials before installing.

Based on public adoption and transparency signals as of Oct 19, 2026. Our opinion, not a code audit or security guarantee.

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What it can access

Local filesNo local folder access notedLOW
Command executionNo shell command runner notedLOW
Network reachFetches arbitrary web URLsREVIEW
CredentialsNo API token requiredLOW
Package sourcenpm (nexus-mcp-agent)PUBLIC

Inferred from this listing’s public package details and description. Check the project’s source before installing.

Install

npx -y nexus-mcp-agent

All setup options ↓

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Everything known

We found nothing about this project in the sources we read (last checked 2026-10-30). That does not mean it has no problems.

0 incidents · 0 advisories · 0 news articles · 0 community threads · checked 2026-10-30

Popularity grade: D (from public signals such as stars and downloads, not a code review). Graded 2026-10-20.

Sources we read: OSV, GitHub Advisory Database, CISA Known Exploited Vulnerabilities, 44 security news feeds and our incident library. Last checked 2026-10-30.

Check a specific version →

About Nexus MCP Agent

Nexus MCP Agent is an MCP server focused on Web & browsing and Cloud & infrastructure: Agentic OS MCP Server — 150+ tools with on-demand loading (26 core), Streamable HTTP transport, background task engine, browser automation, TF-IDF semantic memory, multi-agent orchestration. Zero API keys.

It is published on npm as nexus-mcp-agent and hosted on GitHub at anomalyco/nexus-mcp (44 weekly npm downloads). Based on its public metadata, its operational scope includes: fetches arbitrary web urls.

Setup

These use the package this listing points to. Check the project’s own instructions before running anything.

npm command

npx -y nexus-mcp-agent

MCP client config

For Claude Desktop (claude_desktop_config.json) or Cursor (.cursor/mcp.json).

json

{
  "mcpServers": {
    "nexus-mcp-agent": {
      "command": "npx",
      "args": [
        "-y",
        "nexus-mcp-agent"
      ]
    }
  }
}

Why this grade

DD — High risk signals

Signal-based grade (1/7 points): public source code. This reflects adoption and transparency, not a code review.

Popularity and upkeep

15/100

Weekly npm downloads: 44
Listing last refreshed: 2026-10-30

These are public popularity signals, not a maintenance check. Look at the repository’s commit history and open issues.

Risks to watch for

Untrusted web content & prompt injection: Fetches arbitrary web pages or remote endpoints where hidden instructions could manipulate agent behavior. Restrict outbound domains and review tool outputs.
Dependency & version pinning: Distributed via npm (nexus-mcp-agent). Pin an exact release version or commit SHA rather than floating tags so upstream updates are reviewed first.

How to lower the risk

Least-privilege permissions

Give it access only to the specific folders, accounts or projects it needs, never your whole drive or admin account.
Use a separate, limited API key or login just for this tool so you can switch it off without affecting anything else.

Network isolation

Run it on a work computer or sandbox account, not one holding personal or company-sensitive data.
If your IT team can, limit which websites and services it is allowed to contact.

Monitoring

Check its activity history or logs weekly at first, and look at what it changed or sent.
Turn on alerts for new logins or unusual usage on any account it connects to.

Red flags to watch for

It asks for more access than its job requires, or prompts you to paste passwords.
It suddenly updates with new owners, or starts contacting unfamiliar websites.

Questions

How do I install Nexus MCP Agent?

Run npx -y nexus-mcp-agent in your terminal, or add the server entry to your claude_desktop_config.json or .cursor/mcp.json as shown in the Setup section on this page. Full setup docs and environment variables are in github.com/anomalyco/nexus-mcp.

Are there security reports about Nexus MCP Agent?

No reports found for this package in our research (last checked 2026-10-30). Nexus MCP Agent currently holds Grade D (High risk signals) based on public adoption and transparency signals. Review the permissions and source repository before granting access to local files, shell commands, or API keys.

Is Nexus MCP Agent actively maintained?

Nexus MCP Agent has 44 weekly npm downloads. Our directory data was last refreshed on 2026-10-30. Check recent commit activity, release tags, and open issues at github.com/anomalyco/nexus-mcp before pinning it in production.

What are alternatives to Nexus MCP Agent?

You can compare Nexus MCP Agent side by side with other Browser, Memory MCP servers in the Related tools section on this page, or use the Compare tool on AgentArmorHQ.

Maintain or use Nexus MCP Agent? Show its live grade in your GitHub README, docs site, or run a check from the terminal before you install.

AgentArmorHQ Risk Grade D for Nexus MCP Agent

GitHub README Markdown:

markdown

[![AgentArmorHQ Risk Grade for Nexus MCP Agent](https://agentarmorhq.com/api/badge/anomalyco-nexus-mcp)](https://agentarmorhq.com/skills/anomalyco-nexus-mcp)

HTML embed:

html

<a href="https://agentarmorhq.com/skills/anomalyco-nexus-mcp"><img src="https://agentarmorhq.com/api/badge/anomalyco-nexus-mcp" alt="AgentArmorHQ Risk Grade for Nexus MCP Agent" height="20" /></a>

Terminal check:

terminal

curl -fsSL https://agentarmorhq.com/api/cli | node --input-type=module - check "anomalyco-nexus-mcp"

Share with your security lead

Need sign-off to use nexus-mcp-agent? Copy this note for Slack, a ticket or a pull request.

### AgentArmorHQ Security Review Memo: nexus-mcp-agent
- **Listing URL:** https://agentarmorhq.com/skills/anomalyco-nexus-mcp
- **Type:** App connector
- **Risk Grade:** Grade D (High risk signals)
- **Outside Security Advisories on File:** 0

#### Permission & Blast-Radius Signals
- **Local files:** No local folder access noted
- **Command execution:** No shell command runner noted
- **Network reach:** Fetches arbitrary web URLs
- **Credentials:** No API token required
- **Package source:** npm (nexus-mcp-agent)

#### Recommended Hardened Setup
- **Command:** `npx -y --ignore-scripts nexus-mcp-agent`
- **Controls:** Pin an exact version in `.mcp.json`, scope access to a single workspace folder, and use a least-privilege read-only token where supported.

_Based on public adoption and transparency signals as of Oct 19, 2026. Our opinion, not a code audit or security guarantee._

Key facts

Type: App connector
Publisher: anomalyco
Source code: github.com/anomalyco/nexus-mcp
Install command: npm install nexus-mcp-agent
Est. context load: ~900 tokens / turn (~5 tool schemas, 0.45% of 200k context)
Popularity: 44 weekly npm downloads
Last updated: 2026-10-30
Last graded: 2026-10-20

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