A Source SDK update is available and will be applied automatically when Steam is restarted. The changes include:

Source SDK

• Added XSI addon for importing and exporting SMDs


• Added simple SDK bot sample code for adding bots to your mod


• Added source files for six Half-Life 2 single player maps


• Added interface plugin to add bots to mods


• Fixed resource leak in the SDK launcher and vconfig utiity


• Added bspzip tool -- allows you to compile custom content directly into a .bsp