alt Hacker News> Valve aren't really known for supporting their engines very well beyond their own internal needs.
Valve has a long history of supporting the modding community and outside users of Source, not sure where you're getting your information from but I don't think they've worked with the Source engine before. One of the biggest and most popular mods of all time was built on Source, and took the world by storm, with pretty big support by Valve through the years as well. Eventually they even bought the whole IP.
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hn773746483 • today at 12:49 AM
There are various internal Valve tools that aren't available in any Valve-published SDK, but are in (accidentally?) within Dino D-Day's, a third party game based on Portal 2's version of Source.
That was then, in 2025 they don't have a public Source 2 SDK, nor do they generally license the engine to third parties, S&box being the sole exception. They barely have their toes in the middleware game anymore.
Even when they were more open with their tech it was on the basis of "you can play with the tools we used to make Half Life and if your idea is sufficiently Half Life shaped then it will probably work", not trying to be a general purpose toolkit a la Unity.