Garry's Mod Content Packs: Mounting CS:S, TF2 and Missing Assets

Garry's Mod Guide • Updated Sep 1, 2026

Garry's Mod Content Packs and Missing Assets

Many GMod maps and addons reference assets from other Source games. A mounted game on the server is not automatically the same thing as client delivery: players may still need the documented Workshop or FastDL path for models, materials, sounds, and maps. Use Facepunch's Mounting Content and Serving Content pages for the current rules.

Last verified: September 1, 2026. Do not copy an old Workshop ID or promise that a player can render mounted assets without the required files. Test the exact map, gamemode, and client path you intend to publish.

What “missing content” means

Symptom	Likely cause	Check
“ERROR” models or purple/black textures	Client lacks an asset	Read the map/addon documentation and verify Workshop/FastDL delivery.
Server console cannot load a file	Mount path or game install is wrong	Confirm the mounted game is installed where the server expects it and restart.
Content works locally but not for friends	Home machine has files the client never receives	Test a clean client and add the documented delivery mechanism.
Downloads are very slow	Legacy ServerDL or a bad HTTP setup	Prefer WorkshopDL; use FastDL only with a correctly configured web server.

Mount content deliberately

Use garrysmod/cfg/mount.cfg only for games installed on the server and only for mount names documented by Facepunch:

"mountcfg"
{
    "cstrike" "1"     // Counter-Strike: Source
    "tf" "1"          // Team Fortress 2
    "hl2" "1"         // Half-Life 2
    "ep2" "1"         // Episode Two
    "episodic" "1"    // Episode One
}

Mounting does not turn an unowned game into a legal content source. Follow the game and addon licences, and never redistribute proprietary files outside the supported workflow.

Choose the right client-delivery path

WorkshopDL: preferred for Workshop content when the addon supports it.
FastDL: a web-server mirror for custom files; keep its folder layout and compression exact.
ServerDL: the legacy path; Facepunch warns that it is slow and should generally be avoided.
Lua: follow the addon author’s resource.AddWorkshop or script instructions; Lua itself is handled separately from ordinary file downloads.

Isolation test

Boot a stock map with -noaddons -noworkshop.
Join from a clean client.
Enable the required mount, then the Workshop collection, then the custom map.
Keep the last known-good stack and record the first missing asset/error.

Related Garry's Mod guides

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