Add a Workshop Collection to Your Garry's Mod Server

Updated 10 June 2026 · By Host Havoc Technical Support Team

A Steam Workshop Collection lets you bundle multiple addons so they load automatically when the server starts. After setting up the collection you can also force players to download workshop addons so clients sync on connect.

Steps

1. Create a Steam Workshop Collection for Garry's Mod (App ID 4000).

2. Set the collection's privacy to Public.

3. Subscribe to each addon you want to include, then add them to the collection by editing it.

4. Get your Workshop Collection ID from the URL of the collection page. It is the numeric value at the end of the URL.

Tip: If you do not see the numeric ID in the URL, enable it in Steam Settings under Interface.

5. Obtain your Steam API key from http://steamcommunity.com/dev.

6. Log in to the Game Control Panel and navigate to your server.

7. Click the Command Line Manager icon, then switch to the Custom Command Lines tab. Create a custom command line if you do not have one.

8. Enter the Workshop Collection ID and your Steam API key in their respective fields.

9. Save and select the command line.

The addons in your collection will now be downloaded and loaded when the server starts.