Helionyx MCP Server

What the code does

We read the source, 9 h ago · rules 995398eba69f

A value the model can set ends up inside a file or shell call. That is not a flaw by itself — for a terminal server it is the job — but it is where things go wrong when it is not.

    streams = np.random.SeedSequence(seed).spawn(len(components))

What this server is able to do. For an MCP server this is often the job itself — a terminal server runs commands because that is what it is for. Listed so you know what you are plugging in, not as an accusation.

                proc = subprocess.run([*cmd, "run", str(src), str(dst)], capture_output=True, text=True,

Is this your server and something here is wrong? Tell us — corrections are free and do not require a plan.

Connect this server

This server runs on your own machine — install it with the package manager and the client starts it for you. Package name taken from the official registry entry.

claude mcp add helionyx -- uvx helionyx

{
  "mcpServers": {
    "helionyx": {
      "command": "uvx",
      "args": [
        "helionyx"
      ]
    }
  }
}

[mcp_servers.helionyx]
command = "uvx"
args = ["helionyx"]

{
  "mcpServers": {
    "helionyx": {
      "command": "uvx",
      "args": [
        "helionyx"
      ]
    }
  }
}

{
  "servers": {
    "helionyx": {
      "type": "stdio",
      "command": "uvx",
      "args": [
        "helionyx"
      ]
    }
  }
}

Optional settings from the registry entry, left out of the block above: HNX_WORKSPACE (Workspace directory for the database, artefacts and exports (default ~/.helionyx)), HNX_OFFLINE (Set to 1 to use only cached and bundled data (no network calls)), HNX_REOPT_API_KEY (Optional NREL REopt API key for the reopt cross-check solver).