# ValveSoftware/source-sdk-2013

The 2013 edition of the Source SDK

Repository: https://github.com/ValveSoftware/source-sdk-2013
Canonical: https://ross.abutalabs.com/products/source-sdk-2013
Homepage: https://developer.valvesoftware.com/wiki/SDK2013_GettingStarted
Language: C++
License: NOASSERTION
License Family: other
Last push: 2026-08-26T02:39:30+00:00

## Health v2 (maintenance only)
Score: 77/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 99, release rhythm 35, longevity 100
- inputs: {"age_days": 4816, "days_push": 7, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: no_releases, no_license
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 9952, forks 3015 (observed 2026-08-28T04:10:38.945663+00:00)

## What it is
Valve's Source SDK 2013, the source code for the Source engine's game layer including Half-Life 2, Half-Life 2: Deathmatch, and Team Fortress 2. It lets developers build and distribute custom Source engine mods on Windows and Linux.

## Use cases
- create a Half-Life 2 mod
- build a Team Fortress 2 mod
- learn Source engine game programming
- distribute a mod on Steam
- study Valve's game source code

## When to choose
- you want to build a mod for HL2, HL2DM, or TF2 on the Source engine
- you need to compile mods against the Steam Runtime for Steam distribution
- you want to study real shipped game code from Valve

## When to avoid
- you want to make a game on a modern engine like Unity or Unreal
- you need a non-commercial-free license - the SDK license is non-commercial only
- you want to modify the engine renderer itself, which is not included

## Facets
- artifact type: framework
- maturity: maintenance
- function: game-engine, sdk, developer-tools
- domain: gaming-tools
- platform: windows, cpp
- tags: source-engine, game-modding, half-life-2, team-fortress-2, valve, mod-sdk, game-development, linux, steam

## Member repositories
- ValveSoftware/source-sdk-2013 (main) score 77

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:10:38.945663+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-29T17:20:16.504041+00:00, confidence not recorded.
  - readme: https://github.com/ValveSoftware/source-sdk-2013 (fetched 2026-08-28T04:10:38.945663+00:00, sha 832d9216a336)
  - homepage: https://developer.valvesoftware.com/wiki/SDK2013_GettingStarted (fetched 2026-08-29T08:19:58.021445+00:00, sha ba32883d2114)
- Data as of 2026-08-30T08:39:29.467469+00:00.