<function name="IsJumpLegal" parent="ENTITY" type="hook"> <description> Called when deciding if the Scripted NPC should be able to perform a certain jump or not. <note>This is only called for "ai" type entities</note> </description> <realm>Server</realm> <args> <arg name="startPos" type="Vector">Start of the jump</arg> <arg name="apex" type="Vector">Apex point of the jump</arg> <arg name="endPos" type="Vector">The landing position</arg> </args> <rets> <ret name="" type="boolean">Return true if this jump should be allowed to be performed, false otherwise. Not returning anything, or returning a non boolean will perform the default action.</ret> Not returning anything, or returning a non boolean will perform the [default action](https://github.com/ValveSoftware/source-sdk-2013/blob/master/sp/src/game/server/ai_basenpc_movement.cpp#L319).</ret> </rets> </function>