List of predefined response concepts

The following is a list of response concepts as defined in the SDK source.

Tip:Custom response concepts can be added to NPC code or passed through each actor's speakresponseconcept input.

Concepts are defined in ai_playerally.h (the TLK_ macros)

List of predefined response concepts

Concept string	Applies to	Description
TLK_ANSWER
TLK_ANSWER_HELLO
TLK_QUESTION
TLK_IDLE
TLK_STARE
TLK_LOOK
TLK_USE	player allies, npc_vortigaunt	The player has done +USE on the NPC.
TLK_STARTFOLLOW	npc_citizen and simpletalkers	The NPC has begun following the player.
TLK_STOPFOLLOW	npc_citizen and simpletalkers	The NPC has begun following the player.
TLK_JOINPLAYER	npc_citizen
TLK_STOP	simpletalkers
TLK_NOSHOOT	simpletalkers	The NPC has been damaged by the player, has a friend nearby, and is not dead yet.
TLK_HELLO
TLK_PHELLO
TLK_HELLO_NPC
TLK_PIDLE
TLK_PQUESTION
TLK_PLHURT1		If player's health is <= 50%
TLK_PLHURT2		If player's health is <= 25%
TLK_PLHURT3		If player's health is <= 12.5%
TLK_PLPUSH		If the player has pushed the NPC out of the way Ex: "Let me get out of your way"
TLK_PLRELOAD		If the player needs to reload
TLK_SMELL	simpletalkers, the player (only in )
TLK_SHOT	player allies, the player (only in )	The NPC has been shot. (Identifies location of damage.)
TLK_WOUND	player allies, npc_monk	The NPC has light wounds (health is <= 75% max).
TLK_MORTAL	player allies	The NPC has mortal wounds (health is <= 50% max).
TLK_DANGER	player companions, npc_monk	The NPC senses something nearby that's dangerous (e.g. a grenade)
TLK_PLYR_PHYSATK		The NPC has been hit by an object thrown by the player
TLK_SEE_COMBINE		The NPC has seen a Combine NPC
TLK_ENEMY_DEAD	npc_monk	The NPC has killed a enemy
TLK_ALYX_ENEMY_DEAD	npc_alyx	Custom TLK_ENEMY_DEAD for Alyx post Half-Life 2: Episode One
TLK_SELECTED		The NPC is selected by player in command mode.
TLK_COMMANDED		The NPC has received orders from player in command mode.
TLK_COMMAND_FAILED
TLK_BETRAYED		The player killed an ally of the NPC in front of the NPC.
TLK_ALLY_KILLED		The NPC witnessed an ally die some other way.
TLK_ATTACKING		The NPC is about to fire my weapon at a target.
TLK_HEAL		The NPC is healing someone Ex: "Take this medkit"
TLK_GIVEAMMO		The NPC is giving ammo to someone
TLK_DEATH	npc_citizen, npc_monk, npc_alyx	Death rattle; NPC has died.
TLK_HELP_ME		Call out to the player for help.
TLK_PLYR_PHYSATK		Player has attacked the NPC with a thrown physics object.
TLK_ANSWER_VORT
TLK_ANSWER_CIT
TLK_QUESTION_VORT
TLK_QUESTION_CIT
TLK_NEWWEAPON	player companions	The NPC is picking up a new weapon.
TLK_PLDEAD		Player has died. Ex: "Dips on the suit?"
TLK_HIDEANDRELOAD
TLK_STARTCOMBAT	player companions, citizens, npc_alyx
TLK_WATCHOUT	player companions, npc_alyx
TLK_MOBBED	player companions, npc_alyx
TLK_MANY_ENEMIES	player companions, npc_alyx	Alyx sees more than four enemies
TLK_FLASHLIGHT_ILLUM	npc_alyx
TLK_FLASHLIGHT_ON	npc_alyx	Player turned on flashlight
TLK_FLASHLIGHT_OFF	npc_alyx	Player turned off flashlight
TLK_DARKNESS_LOSTPLAYER	npc_alyx
TLK_DARKNESS_FOUNDPLAYER	npc_alyx
TLK_DARKNESS_UNKOWN_WOUND	npc_alyx
TLK_DARKNESS_HEARDSOUND	npc_alyx	The NPC has heard an enemy in the darkness. Alyx waits
TLK_DARKNESS_LOSTENEMY_BY_FLASHLIGHT	npc_alyx	The NPC has lost a enemy in the darkness because of the flashlight
TLK_DARKNESS_LOSTENEMY_BY_FLASHLIGHT_EXPIRED	npc_alyx	The NPC has lost a enemy in the darkness because the flashlight went out
TLK_DARKNESS_FOUNDENEMY_BY_FLASHLIGHT	npc_alyx	The NPC has found a enemy in the darkness because of the flashlight
TLK_DARKNESS_FLASHLIGHT_EXPIRED	npc_alyx	The players flashlight has expired while not in combat [Clarify]
TLK_DARKNESS_ENEMY_IN_DARKNESS	npc_alyx	The NPC has an enemy, but it's in the darkness
TLK_SPOTTED_INCOMING_HEADCRAB	npc_alyx	The NPC has seen a headcrab jumping at it for the first time
TLK_CANT_INTERACT_NOW	npc_alyx	The NPC is too busy to interact with an object the player is holding up to it [Clarify]
TLK_ALLY_IN_BARNACLE	npc_alyx , npc_wilson(only in )	The NPC is seeing an ally being grabbed by a barnacle
TLK_SELF_IN_BARNACLE	npc_alyx , the player (only in )	The NPC has been grabbed by a barnacle
TLK_FOUNDPLAYER	npc_alyx
TLK_PLAYER_KILLED_NPC	player companions
TLK_ENEMY_BURNING	npc_alyx
TLK_SPOTTED_ZOMBIE_WAKEUP	npc_alyx	The NPC has seen a zombie getting up
TLK_SPOTTED_HEADCRAB_LEAVING_ZOMBIE	npc_alyx	The NPC has seen a headcrab leaving a zombie that just died
TLK_DANGER_ZOMBINE_GRENADE	npc_alyx	Alyx has seen a npc_zombine pulling out a grenade
TLK_BALLSOCKETED	npc_alyx
TLK_PASSENGER_WARN_COLLISION		About to collide with something, Presumed to be used by Alyx in Half-Life 2: Episode Two
TLK_PASSENGER_IMPACT		Just hit something
TLK_PASSENGER_OVERRTURNED		Vehicle was just overturned
TLK_PASSENGER_REQUEST_UPRIGHT		Vehicle needs to be put upright
TLK_PASSENGER_ERRATIC_DRIVING		Vehicle is moving erratically
TLK_PASSENGER_VEHICLE_STARTED		Vehicle has started moving
TLK_PASSENGER_VEHICLE_STOPPED		Vehicle has stopped moving
TLK_PASSENGER_BEGIN_ENTRANCE		Passenger started entering seat
TLK_PASSENGER_FINISH_ENTRANCE		Passenger finished entering seat (is in seat)
TLK_PASSENGER_BEGIN_EXIT		Passenger started exiting seat
TLK_PASSENGER_FINISH_EXIT		Passenger finished exiting seat (seat is vacated)
TLK_PASSENGER_NEW_RADAR_CONTACT		Passenger notices a new contact on the radar
TLK_PASSENGER_PUNTED		The Player has punted us while we're sitting in the vehicle
TLK_VORTIGAUNT	npc_vortigaunt	Dispel attack starting
TLK_RESUME		"as I was saying..." or "anyhow..."
TLK_TGSTAYPUT		not used in code, part of a "Tour Guide" NPC
TLK_TGFIND		not used in code, part of a "Tour Guide" NPC
TLK_TGSEEK		not used in code, part of a "Tour Guide" NPC
TLK_TGLOSTYOU		not used in code, part of a "Tour Guide" NPC
TLK_TGCATCHUP		not used in code, part of a "Tour Guide" NPC
TLK_TGENDTOUR		not used in code, part of a "Tour Guide" NPC
TLK_TAKING_FIRE (only in )	player allies	Someone fired at me (regardless of whether I was hit)
TLK_NEW_ENEMY (only in )	player allies	A new enemy appeared while combat was already in progress
TLK_COMBAT_IDLE (only in )	player allies	Similar to TLK_ATTACKING, but specifically for when *not* currently attacking (when in cover or reloading)
TLK_SURRENDER (only in )	npc_citizen	Citizen just dropped their weapon in fear Note:These responses are only in the codebase, but a indef'd for
TLK_BEG (only in )	npc_citizen	Citizen is unarmed and threatened
TLK_FEAR (only in )	npc_citizen
TLK_MELEE (only in )	npc_citizen, npc_zombie
TLK_THROWGRENADE (only in )	player companions, the player, npc_citizen, npc_combine_s
TLK_USE_SCARE (only in )	the player
TLK_TIPPED (only in )	npc_wilson, npc_turret_floor	The NPC has been tipped over
TLK_FIDGET (only in )	npc_wilson
TLK_XEN_GRENADE_RELEASE (only in )	npc_wilson
TLK_REMIND_PLAYER (only in )	npc_wilson
TLK_APC_LOW_CLEARANCE (only in )	npc_wilson
TLK_APC_EJECTED (only in )	npc_wilson
TLK_WITNESS_EAT (only in )	npc_wilson
TLK_GOODBYE (only in )	npc_wilson
TLK_SCAN_START (only in )	npc_wilson
TLK_SCAN_END (only in )	npc_wilson
TLK_REMARK (in all games since )(also in )	the player, npc_wilson	The NPC will comment of a info_remarkable

See also

• Response System