Helionyx MCP Server
by jayzilvaio.github.Jayzilva/helionyxv0.3.0
Size hybrid solar PV, wind, battery, diesel and grid systems: hourly simulation, NPC ranking.
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Active3d ago
Install Helionyx MCP server
Install in Claude Code
claude mcp add helionyx -e HNX_REOPT_API_KEY='<hnx-reopt-api-key>' -- uvx helionyx serveInstall in Cursor
{
"mcpServers": {
"helionyx": {
"command": "uvx",
"args": [
"helionyx",
"serve"
],
"env": {
"HNX_REOPT_API_KEY": "<hnx-reopt-api-key>"
}
}
}
}Add to ~/.cursor/mcp.json (global) or .cursor/mcp.json (project).
Install in Claude Desktop
{
"mcpServers": {
"helionyx": {
"command": "uvx",
"args": [
"helionyx",
"serve"
],
"env": {
"HNX_REOPT_API_KEY": "<hnx-reopt-api-key>"
}
}
}
}Settings → Developer → Edit Config (claude_desktop_config.json), then restart.
Install in VS Code
{
"servers": {
"helionyx": {
"type": "stdio",
"command": "uvx",
"args": [
"helionyx",
"serve"
],
"env": {
"HNX_REOPT_API_KEY": "<hnx-reopt-api-key>"
}
}
}
}Add to .vscode/mcp.json in your workspace.
Install in Windsurf
{
"mcpServers": {
"helionyx": {
"command": "uvx",
"args": [
"helionyx",
"serve"
],
"env": {
"HNX_REOPT_API_KEY": "<hnx-reopt-api-key>"
}
}
}
}Add to ~/.codeium/windsurf/mcp_config.json.
Configuration
| Variable | Required | Secret | Description |
|---|---|---|---|
| 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 | — | yes | Optional NREL REopt API key for the reopt cross-check solver |
Freshness
Active — last maintenance signal 3d ago. The newest of the signals below sets the band.
Last commit (default branch)
2026-10-07 · 3d ago · GitHub
Latest release
2026-10-07 · 3d ago · GitHub · v0.3.0
Package published
no data · npm/PyPI
Registry entry updated
2026-10-07 · 3d ago · official registry · v0.3.0
FAQ
›How do I install the Helionyx MCP server in Claude Code?
Run: claude mcp add helionyx -e HNX_REOPT_API_KEY='<hnx-reopt-api-key>' -- uvx helionyx serve. For Cursor, VS Code, Claude Desktop and Windsurf, use the install tabs above.
›Does Helionyx require an API key?
Yes. It expects HNX_REOPT_API_KEY, of which 1 is a secret.
›Can I use Helionyx as a remote (hosted) MCP server?
No hosted endpoint is published; it runs locally over stdio.
›Is Helionyx in the official MCP registry?
Yes, as io.github.Jayzilva/helionyx.