List of predefined response concepts
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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 |