How do I install Helionyx?

Helionyx is a local plugin. Install it using PyPI package: helionyx and add the generated configuration snippet to your AI app's MCP config file. Then restart your AI app.

Is Helionyx safe to use?

Helionyx was flagged by MCP Marketplace's security scan, scoring 4.8/10 (high risk). It has 3 high or critical findings to review. Review the security report on this page carefully before installing it.

What credentials does Helionyx need?

Helionyx requires the following credentials or environment variables: HNX_WORKSPACE, HNX_OFFLINE, HNX_REOPT_API_KEY. You can find setup instructions on the server detail page.

What AI apps work with Helionyx?

Helionyx uses the Model Context Protocol (MCP) and works with any MCP-compatible AI app, including Claude, ChatGPT / Codex, Gemini, Copilot, Cursor, and more.

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Helionyx MCP Server

by Jayzilva

Developer ToolsUse Caution4.8MCP RegistryLocal

Free

Server data from the Official MCP Registry

Size hybrid solar PV, wind, battery, diesel and grid systems: hourly simulation, NPC ranking.

About

Size hybrid solar PV, wind, battery, diesel and grid systems: hourly simulation, NPC ranking.

Security Report

4.8

Use Caution4.8High Risk

Helionyx is a well-architected renewable energy sizing MCP server with thoughtful security design. Authentication is optional but appropriately scoped for local-first operation; the codebase shows good defensive practices including input validation, error handling, and proper dependency management. Permissions are appropriate for a developer tool (network access for NASA POWER/PVGIS APIs, subprocess spawning for solvers). A few minor code quality observations exist, but no significant security vulnerabilities were identified. Supply chain analysis found 9 known vulnerabilities in dependencies (0 critical, 3 high severity). Package verification found 1 issue.

4 files analyzed · 15 issues found

Security scores are indicators to help you make informed decisions, not guarantees. Always review permissions before connecting any MCP server.

Permissions Required

This plugin requests these system permissions. Most are normal for its category.

HTTP Network Access

Connects to external APIs or services over the internet.

File System Read

Reads files on your machine. Normal for tools that analyze or process local data.

File System Write

Writes or modifies files on your machine. Check that this is expected for the tool.

env_vars

Check that this permission is expected for this type of plugin.

process_spawn

Check that this permission is expected for this type of plugin.

subprocess

Check that this permission is expected for this type of plugin.

database

Check that this permission is expected for this type of plugin.

What You'll Need

Set these up before or after installing:

Workspace directory for the database, artefacts and exports (default ~/.helionyx)Optional

Environment variable: HNX_WORKSPACE

Set to 1 to use only cached and bundled data (no network calls)Optional

Environment variable: HNX_OFFLINE

Optional NREL REopt API key for the reopt cross-check solverRequired

Environment variable: HNX_REOPT_API_KEY

How to Install

Add this to your MCP configuration file:

{
  "mcpServers": {
    "io-github-jayzilva-helionyx": {
      "env": {
        "HNX_OFFLINE": "your-hnx-offline-here",
        "HNX_WORKSPACE": "your-hnx-workspace-here",
        "HNX_REOPT_API_KEY": "your-hnx-reopt-api-key-here"
      },
      "args": [
        "helionyx"
      ],
      "command": "uvx"
    }
  }
}

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4.8

Local

mcp-creator-python

Free

by mcp-marketplace · Developer Tools

Create, build, and publish Python MCP servers to PyPI — conversationally.

Helionyx MCP Server

About

Security Report

Findings (15)Action required

Permissions Required

What You'll Need

How to Install

Reviews

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