Reference
Environment & Configuration
Supported environment variables, download settings, and local credential rules.
Environment variables
| Variable | Purpose | Notes |
|---|---|---|
MCL_MICROSOFT_CLIENT_ID |
Microsoft OAuth application Client ID | Required when building from source with Microsoft sign-in; can also live in .env.local inside the app data directory. |
MCL_CURSEFORGE_API_KEY |
CurseForge Core API key | Optional; enables CurseForge search and metadata requests without entering a key in the UI. |
Download settings
In Settings → Downloads, you can tune:
- Download source / mirror preference
- Concurrency limits
- Speed limit throttling
- HTTP / SOCKS proxy configuration