diff --git a/code/datums/actions/item_action.dm b/code/datums/actions/item_action.dm
index 9f40c72b44b..e5fa0cf561d 100644
--- a/code/datums/actions/item_action.dm
+++ b/code/datums/actions/item_action.dm
@@ -27,7 +27,11 @@
 	. = ..()
 	if(!.)
 		return FALSE
-	if(target)
-		var/obj/item/item_target = target
-		item_target.ui_action_click(owner, src)
+	return do_effect(trigger_flags)
+
+/datum/action/item_action/proc/do_effect(trigger_flags)
+	if(!target)
+		return FALSE
+	var/obj/item/item_target = target
+	item_target.ui_action_click(owner, src)
 	return TRUE
diff --git a/code/datums/actions/items/adjust.dm b/code/datums/actions/items/adjust.dm
index 70d49662219..be04a0f8dbd 100644
--- a/code/datums/actions/items/adjust.dm
+++ b/code/datums/actions/items/adjust.dm
@@ -5,3 +5,18 @@
 	..()
 	var/obj/item/item_target = target
 	name = "Adjust [item_target.name]"
+
+/datum/action/item_action/adjust/do_effect(trigger_flags)
+	if(!isclothing(target))
+		CRASH("adjust_visor action attempted to trigger on a non-clothing atom [target] ([target?.type]) owned by [owner] ([owner?.type]!")
+	var/obj/item/clothing/as_clothing = target
+	as_clothing.adjust_visor(owner)
+	return TRUE
+
+/datum/action/item_action/adjust_style
+	name = "Adjust Item Style"
+
+/datum/action/item_action/adjust_style/New(Target)
+	..()
+	var/obj/item/item_target = target
+	name = "Adjust [item_target.name]'s Style"
diff --git a/code/datums/actions/items/beserk.dm b/code/datums/actions/items/beserk.dm
index 01183fd8e3f..b7d979d499e 100644
--- a/code/datums/actions/items/beserk.dm
+++ b/code/datums/actions/items/beserk.dm
@@ -6,10 +6,7 @@
 	background_icon_state = "bg_demon"
 	overlay_icon_state = "bg_demon_border"
 
-/datum/action/item_action/berserk_mode/Trigger(trigger_flags)
-	. = ..()
-	if(!.)
-		return FALSE
+/datum/action/item_action/berserk_mode/do_effect(trigger_flags)
 	var/obj/item/clothing/head/hooded/berserker/berserk = target
 	berserk.berserk_mode(owner)
 	return TRUE
diff --git a/code/datums/actions/items/cult_dagger.dm b/code/datums/actions/items/cult_dagger.dm
index 6b188e85e90..5dec55c7158 100644
--- a/code/datums/actions/items/cult_dagger.dm
+++ b/code/datums/actions/items/cult_dagger.dm
@@ -16,24 +16,25 @@
 
 	return ..()
 
-/datum/action/item_action/cult_dagger/Trigger(trigger_flags)
-	if(target in owner.held_items)
-		var/obj/item/target_item = target
-		target_item.attack_self(owner)
-		return
+/datum/action/item_action/cult_dagger/do_effect(trigger_flags)
+	if(!isliving(owner))
+		to_chat(owner, span_warning("You lack the necessary living force for this action."))
+		return FALSE
+
 	var/obj/item/target_item = target
+	var/mob/living/living_owner = owner
+	if(target in owner.held_items)
+		target_item.attack_self(owner)
+		return TRUE
+
 	if(owner.can_equip(target_item, ITEM_SLOT_HANDS))
 		owner.temporarilyRemoveItemFromInventory(target_item)
 		owner.put_in_hands(target_item)
 		target_item.attack_self(owner)
-		return
+		return TRUE
 
-	if(!isliving(owner))
-		to_chat(owner, span_warning("You lack the necessary living force for this action."))
-		return
-
-	var/mob/living/living_owner = owner
 	if (living_owner.usable_hands <= 0)
 		to_chat(living_owner, span_warning("You don't have any usable hands!"))
 	else
 		to_chat(living_owner, span_warning("Your hands are full!"))
+	return FALSE
diff --git a/code/datums/actions/items/stealth_box.dm b/code/datums/actions/items/stealth_box.dm
index bf297e4e1c2..e61c19d26d7 100644
--- a/code/datums/actions/items/stealth_box.dm
+++ b/code/datums/actions/items/stealth_box.dm
@@ -12,7 +12,7 @@
 	COOLDOWN_DECLARE(box_cooldown)
 
 ///Handles opening and closing the box.
-/datum/action/item_action/agent_box/Trigger(trigger_flags)
+/datum/action/item_action/agent_box/do_effect(trigger_flags)
 	. = ..()
 	if(!.)
 		return FALSE
@@ -20,13 +20,13 @@
 		var/obj/structure/closet/cardboard/agent/box = owner.loc
 		if(box.open())
 			owner.playsound_local(box, 'sound/misc/box_deploy.ogg', 50, TRUE)
-		return
+		return FALSE
 	//Box closing from here on out.
 	if(!isturf(owner.loc)) //Don't let the player use this to escape mechs/welded closets.
 		to_chat(owner, span_warning("You need more space to activate this implant!"))
-		return
+		return FALSE
 	if(!COOLDOWN_FINISHED(src, box_cooldown))
-		return
+		return FALSE
 	COOLDOWN_START(src, box_cooldown, 10 SECONDS)
 	var/box = new boxtype(owner.drop_location())
 	owner.forceMove(box)
diff --git a/code/datums/actions/items/toggles.dm b/code/datums/actions/items/toggles.dm
index 70b201777cf..c9dc6e06e73 100644
--- a/code/datums/actions/items/toggles.dm
+++ b/code/datums/actions/items/toggles.dm
@@ -80,16 +80,14 @@
 		return FALSE
 	return ..()
 
-/datum/action/item_action/toggle_hud
+/datum/action/item_action/organ_action/toggle_hud
 	name = "Toggle Implant HUD"
 	desc = "Disables your HUD implant's visuals. You can still access examine information."
 
-/datum/action/item_action/toggle_hud/Trigger(trigger_flags)
-	. = ..()
-	if(!.)
-		return
+/datum/action/item_action/organ_action/toggle_hud/do_effect(trigger_flags)
 	var/obj/item/organ/cyberimp/eyes/hud/hud_implant = target
 	hud_implant.toggle_hud(owner)
+	return TRUE
 
 /datum/action/item_action/wheelys
 	name = "Toggle Wheels"
@@ -120,12 +118,10 @@
 	name = "Toggle Wearable HUD"
 	desc = "Toggles your wearable HUD. You can still access examine information while it's off."
 
-/datum/action/item_action/toggle_wearable_hud/Trigger(trigger_flags)
-	. = ..()
-	if(!.)
-		return
+/datum/action/item_action/toggle_wearable_hud/do_effect(trigger_flags)
 	var/obj/item/clothing/glasses/hud/hud_display = target
 	hud_display.toggle_hud_display(owner)
+	return TRUE
 
 /datum/action/item_action/toggle_nv
 	name = "Toggle Night Vision"
@@ -136,7 +132,7 @@
 	. = ..()
 	target.AddElement(/datum/element/update_icon_updates_onmob)
 
-/datum/action/item_action/toggle_nv/Trigger(trigger_flags)
+/datum/action/item_action/toggle_nv/do_effect(trigger_flags)
 	if(!istype(target, /obj/item/clothing/glasses))
 		return ..()
 	var/obj/item/clothing/glasses/goggles = target
@@ -160,3 +156,4 @@
 		playsound(goggles, 'sound/machines/click.ogg', 30, TRUE, -3)
 	holder?.update_sight()
 	goggles.update_appearance()
+	return TRUE
diff --git a/code/game/objects/items.dm b/code/game/objects/items.dm
index 4760a898108..5ec07f212bf 100644
--- a/code/game/objects/items.dm
+++ b/code/game/objects/items.dm
@@ -121,6 +121,8 @@
 	var/list/datum/action/actions
 	///list of paths of action datums to give to the item on New().
 	var/list/actions_types
+	///Slot flags in which this item grants actions. If null, defaults to the item's slot flags (so actions are granted when worn)
+	var/action_slots = null
 
 	//Since any item can now be a piece of clothing, this has to be put here so all items share it.
 	///This flag is used to determine when items in someone's inventory cover others. IE helmets making it so you can't see glasses, etc.
@@ -781,6 +783,10 @@
 /obj/item/proc/item_action_slot_check(slot, mob/user, datum/action/action)
 	if(slot & (ITEM_SLOT_BACKPACK|ITEM_SLOT_LEGCUFFED)) //these aren't true slots, so avoid granting actions there
 		return FALSE
+	if(!isnull(action_slots))
+		return (slot & action_slots)
+	else if (slot_flags)
+		return (slot & slot_flags)
 	return TRUE
 
 /**
diff --git a/code/game/objects/items/cards_ids.dm b/code/game/objects/items/cards_ids.dm
index fb324ac1200..14eedf9d6ed 100644
--- a/code/game/objects/items/cards_ids.dm
+++ b/code/game/objects/items/cards_ids.dm
@@ -1612,6 +1612,7 @@
 	trim = /datum/id_trim/chameleon
 	wildcard_slots = WILDCARD_LIMIT_CHAMELEON
 	actions_types = list(/datum/action/item_action/chameleon/change/id, /datum/action/item_action/chameleon/change/id_trim)
+	action_slots = ALL
 
 	/// Have we set a custom name and job assignment, or will we use what we're given when we chameleon change?
 	var/forged = FALSE
diff --git a/code/game/objects/items/defib.dm b/code/game/objects/items/defib.dm
index 70fb3bb6693..f09d8794f84 100644
--- a/code/game/objects/items/defib.dm
+++ b/code/game/objects/items/defib.dm
@@ -222,10 +222,6 @@
 		remove_paddles(user)
 		update_power()
 
-/obj/item/defibrillator/item_action_slot_check(slot, mob/user)
-	if(slot_flags & slot)
-		return TRUE
-
 /obj/item/defibrillator/proc/remove_paddles(mob/user) //this fox the bug with the paddles when other player stole you the defib when you have the paddles equiped
 	if(ismob(paddles.loc))
 		var/mob/M = paddles.loc
@@ -286,10 +282,6 @@
 	nocell_state = "defibcompact-nocell"
 	emagged_state = "defibcompact-emagged"
 
-/obj/item/defibrillator/compact/item_action_slot_check(slot, mob/user)
-	if(slot & user.getBeltSlot())
-		return TRUE
-
 /obj/item/defibrillator/compact/loaded/Initialize(mapload)
 	. = ..()
 	cell = new(src)
diff --git a/code/game/objects/items/devices/flashlight.dm b/code/game/objects/items/devices/flashlight.dm
index b3f4e087a82..a52bb057844 100644
--- a/code/game/objects/items/devices/flashlight.dm
+++ b/code/game/objects/items/devices/flashlight.dm
@@ -19,6 +19,7 @@
 	slot_flags = ITEM_SLOT_BELT
 	custom_materials = list(/datum/material/iron= SMALL_MATERIAL_AMOUNT * 0.5, /datum/material/glass= SMALL_MATERIAL_AMOUNT * 0.2)
 	actions_types = list(/datum/action/item_action/toggle_light)
+	action_slots = ALL
 	light_system = OVERLAY_LIGHT_DIRECTIONAL
 	light_color = COLOR_LIGHT_ORANGE
 	light_range = 4
diff --git a/code/game/objects/items/devices/spyglasses.dm b/code/game/objects/items/devices/spyglasses.dm
index 71c9f4e3b08..0c91b8b2255 100644
--- a/code/game/objects/items/devices/spyglasses.dm
+++ b/code/game/objects/items/devices/spyglasses.dm
@@ -36,10 +36,6 @@
 /obj/item/clothing/glasses/sunglasses/spy/ui_action_click(mob/user)
 	show_to_user(user)
 
-/obj/item/clothing/glasses/sunglasses/spy/item_action_slot_check(slot)
-	if(slot & ITEM_SLOT_EYES)
-		return TRUE
-
 /obj/item/clothing/glasses/sunglasses/spy/Destroy()
 	if(linked_bug)
 		linked_bug.linked_glasses = null
diff --git a/code/game/objects/items/devices/traitordevices.dm b/code/game/objects/items/devices/traitordevices.dm
index 3270bdfa5af..91a8a066661 100644
--- a/code/game/objects/items/devices/traitordevices.dm
+++ b/code/game/objects/items/devices/traitordevices.dm
@@ -234,15 +234,12 @@ effective or pretty fucking useless.
 	STOP_PROCESSING(SSobj, src)
 	return ..()
 
-/datum/action/item_action/stealth_mode/Trigger(trigger_flags)
-	. = ..()
-	if(!.)
-		return
-
+/datum/action/item_action/stealth_mode/do_effect(trigger_flags)
 	if(stealth_engaged)
 		stealth_off()
 	else
 		stealth_on()
+	return TRUE
 
 /datum/action/item_action/stealth_mode/proc/stealth_on()
 	animate(owner, alpha = get_alpha(), time = 0.5 SECONDS)
@@ -311,9 +308,6 @@ effective or pretty fucking useless.
 	attack_verb_simple = list("whip", "lash", "discipline")
 	actions_types = list(/datum/action/item_action/stealth_mode)
 
-/obj/item/shadowcloak/item_action_slot_check(slot, mob/user)
-	return slot & slot_flags
-
 /obj/item/shadowcloak/weaker
 	name = "stealth belt"
 	desc = "Makes you nigh-invisible to the naked eye for a short period of time. \
diff --git a/code/game/objects/items/grenades/_grenade.dm b/code/game/objects/items/grenades/_grenade.dm
index bf2b93f6cc1..262a493cc75 100644
--- a/code/game/objects/items/grenades/_grenade.dm
+++ b/code/game/objects/items/grenades/_grenade.dm
@@ -16,6 +16,7 @@
 	flags_1 = PREVENT_CONTENTS_EXPLOSION_1 // We detonate upon being exploded.
 	obj_flags = CONDUCTS_ELECTRICITY
 	slot_flags = ITEM_SLOT_BELT
+	action_slots = ALL
 	max_integrity = 40
 	pickup_sound = 'sound/items/handling/grenade/grenade_pick_up.ogg'
 	drop_sound = 'sound/items/handling/grenade/grenade_drop.ogg'
diff --git a/code/game/objects/items/melee/misc.dm b/code/game/objects/items/melee/misc.dm
index 2ac18ae9b2d..af0fea50feb 100644
--- a/code/game/objects/items/melee/misc.dm
+++ b/code/game/objects/items/melee/misc.dm
@@ -14,6 +14,7 @@
 	righthand_file = 'icons/mob/inhands/weapons/melee_righthand.dmi'
 	obj_flags = CONDUCTS_ELECTRICITY
 	slot_flags = ITEM_SLOT_BELT
+	action_slots = ALL
 	force = 10
 	throwforce = 7
 	demolition_mod = 0.25
diff --git a/code/game/objects/items/rcd/RCD.dm b/code/game/objects/items/rcd/RCD.dm
index eb3d8af2e83..370a6ea5f62 100644
--- a/code/game/objects/items/rcd/RCD.dm
+++ b/code/game/objects/items/rcd/RCD.dm
@@ -16,6 +16,7 @@
 	item_flags = NO_MAT_REDEMPTION | NOBLUDGEON
 	has_ammobar = TRUE
 	actions_types = list(/datum/action/item_action/rcd_scan)
+	action_slots = ALL
 	drop_sound = 'sound/items/handling/tools/rcd_drop.ogg'
 	pickup_sound = 'sound/items/handling/tools/rcd_pickup.ogg'
 	sound_vary = TRUE
diff --git a/code/game/objects/items/scrolls.dm b/code/game/objects/items/scrolls.dm
index 3fea8376eb3..0356a6beb61 100644
--- a/code/game/objects/items/scrolls.dm
+++ b/code/game/objects/items/scrolls.dm
@@ -10,6 +10,7 @@
 	throw_range = 7
 	resistance_flags = FLAMMABLE
 	actions_types = list(/datum/action/cooldown/spell/teleport/area_teleport/wizard/scroll)
+	action_slots = ITEM_SLOT_HANDS
 	/// Number of uses the scroll gets.
 	var/uses = 4
 
@@ -33,9 +34,6 @@
 	to_chat(cast_on, span_warning("[src] runs out of uses and crumbles to dust!"))
 	qdel(src)
 
-/obj/item/teleportation_scroll/item_action_slot_check(slot, mob/user)
-	return (slot & ITEM_SLOT_HANDS)
-
 /obj/item/teleportation_scroll/apprentice
 	name = "lesser scroll of teleportation"
 	uses = 1
diff --git a/code/game/objects/items/signs.dm b/code/game/objects/items/signs.dm
index 0bc545b0189..1a74a8b164a 100644
--- a/code/game/objects/items/signs.dm
+++ b/code/game/objects/items/signs.dm
@@ -62,11 +62,12 @@
 /datum/action/item_action/nano_picket_sign
 	name = "Retext Nano Picket Sign"
 
-/datum/action/item_action/nano_picket_sign/Trigger(trigger_flags)
+/datum/action/item_action/nano_picket_sign/do_effect(trigger_flags)
 	if(!istype(target, /obj/item/picket_sign))
-		return
+		return FALSE
 	var/obj/item/picket_sign/sign = target
 	sign.retext(owner)
+	return TRUE
 
 /datum/crafting_recipe/picket_sign
 	name = "Picket Sign"
diff --git a/code/game/objects/items/storage/backpack.dm b/code/game/objects/items/storage/backpack.dm
index 9d2fa36ff85..b52b0c4fd02 100644
--- a/code/game/objects/items/storage/backpack.dm
+++ b/code/game/objects/items/storage/backpack.dm
@@ -414,6 +414,7 @@
 	icon_state = "duffel"
 	inhand_icon_state = "duffel"
 	actions_types = list(/datum/action/item_action/zipper)
+	action_slots = ALL
 	storage_type = /datum/storage/duffel
 	// How much to slow you down if your bag isn't zipped up
 	var/zip_slowdown = 1
diff --git a/code/game/objects/items/storage/bags.dm b/code/game/objects/items/storage/bags.dm
index bb9e57213da..58e0a685f40 100644
--- a/code/game/objects/items/storage/bags.dm
+++ b/code/game/objects/items/storage/bags.dm
@@ -668,6 +668,7 @@
 	w_class = WEIGHT_CLASS_NORMAL
 	resistance_flags = LAVA_PROOF | FIRE_PROOF | UNACIDABLE | ACID_PROOF
 	actions_types = list(/datum/action/item_action/reload_rebar)
+	action_slots = ALL
 
 /obj/item/storage/bag/rebar_quiver/syndicate/Initialize(mapload)
 	. = ..()
diff --git a/code/game/objects/items/storage/holsters.dm b/code/game/objects/items/storage/holsters.dm
index b1bdc86b39d..6de4e83abb7 100644
--- a/code/game/objects/items/storage/holsters.dm
+++ b/code/game/objects/items/storage/holsters.dm
@@ -138,6 +138,7 @@
 	worn_icon_state = "syndicate_holster"
 	w_class = WEIGHT_CLASS_NORMAL
 	actions_types = list(/datum/action/item_action/chameleon/change/belt)
+	action_slots = ALL
 
 /obj/item/storage/belt/holster/chameleon/Initialize(mapload)
 	. = ..()
diff --git a/code/game/objects/items/tanks/jetpack.dm b/code/game/objects/items/tanks/jetpack.dm
index 674e50caade..815631e4cf8 100644
--- a/code/game/objects/items/tanks/jetpack.dm
+++ b/code/game/objects/items/tanks/jetpack.dm
@@ -63,10 +63,6 @@
 		else
 			REMOVE_TRAIT(user, TRAIT_NOGRAV_ALWAYS_DRIFT, JETPACK_TRAIT)
 
-/obj/item/tank/jetpack/item_action_slot_check(slot)
-	if(slot & slot_flags)
-		return TRUE
-
 /obj/item/tank/jetpack/equipped(mob/user, slot, initial)
 	. = ..()
 	if(on && !(slot & slot_flags))
diff --git a/code/game/objects/items/tanks/tanks.dm b/code/game/objects/items/tanks/tanks.dm
index 6d71ec0208e..9302e95bdcf 100644
--- a/code/game/objects/items/tanks/tanks.dm
+++ b/code/game/objects/items/tanks/tanks.dm
@@ -34,6 +34,7 @@
 	demolition_mod = 1.25
 	custom_materials = list(/datum/material/iron = SMALL_MATERIAL_AMOUNT*5)
 	actions_types = list(/datum/action/item_action/set_internals)
+	action_slots = ALL
 	armor_type = /datum/armor/item_tank
 	integrity_failure = 0.5
 	/// If we are in the process of exploding, stops multi explosions
diff --git a/code/game/objects/items/tanks/watertank.dm b/code/game/objects/items/tanks/watertank.dm
index 4d40c8a7f98..e3ce0822eb8 100644
--- a/code/game/objects/items/tanks/watertank.dm
+++ b/code/game/objects/items/tanks/watertank.dm
@@ -37,10 +37,6 @@
 /obj/item/watertank/ui_action_click(mob/user)
 	toggle_mister(user)
 
-/obj/item/watertank/item_action_slot_check(slot, mob/user)
-	if(slot & user.getBackSlot())
-		return 1
-
 /obj/item/watertank/proc/toggle_mister(mob/living/user)
 	if(!istype(user))
 		return
@@ -409,10 +405,6 @@
 /obj/item/reagent_containers/chemtank/ui_action_click()
 	toggle_injection()
 
-/obj/item/reagent_containers/chemtank/item_action_slot_check(slot, mob/user)
-	if(slot & ITEM_SLOT_BACK)
-		return 1
-
 /obj/item/reagent_containers/chemtank/proc/toggle_injection()
 	var/mob/living/carbon/human/user = usr
 	if(!istype(user))
diff --git a/code/modules/antagonists/abductor/equipment/gear/abductor_clothing.dm b/code/modules/antagonists/abductor/equipment/gear/abductor_clothing.dm
index e5951473df0..365ab92a160 100644
--- a/code/modules/antagonists/abductor/equipment/gear/abductor_clothing.dm
+++ b/code/modules/antagonists/abductor/equipment/gear/abductor_clothing.dm
@@ -80,10 +80,6 @@
 		human_target.update_worn_oversuit()
 	update_item_action_buttons()
 
-/obj/item/clothing/suit/armor/abductor/vest/item_action_slot_check(slot, mob/user)
-	if(slot & ITEM_SLOT_OCLOTHING) //we only give the mob the ability to activate the vest if he's actually wearing it.
-		return TRUE
-
 /obj/item/clothing/suit/armor/abductor/vest/proc/SetDisguise(datum/icon_snapshot/entry)
 	disguise = entry
 
diff --git a/code/modules/antagonists/abductor/equipment/gear/abductor_items.dm b/code/modules/antagonists/abductor/equipment/gear/abductor_items.dm
index b2900b810f3..df52eb34071 100644
--- a/code/modules/antagonists/abductor/equipment/gear/abductor_items.dm
+++ b/code/modules/antagonists/abductor/equipment/gear/abductor_items.dm
@@ -306,6 +306,7 @@ Congratulations! You are now trained for invasive xenobiology research!"}
 	wound_bonus = FALSE
 
 	actions_types = list(/datum/action/item_action/toggle_mode)
+	action_slots = ALL
 
 	cooldown = 0 SECONDS
 	stamina_damage = 0
diff --git a/code/modules/antagonists/fugitive/fugitive_equipment.dm b/code/modules/antagonists/fugitive/fugitive_equipment.dm
index c2adeb438a0..d2034124d52 100644
--- a/code/modules/antagonists/fugitive/fugitive_equipment.dm
+++ b/code/modules/antagonists/fugitive/fugitive_equipment.dm
@@ -27,10 +27,10 @@
 
 	return ..()
 
-/datum/action/item_action/camouflage/Trigger(trigger_flags)
+/datum/action/item_action/camouflage/do_effect(trigger_flags)
 	. = ..()
 	if(!.)
-		return FALSE
+		return
 
 	if(cloaking)
 		remove_cloaking()
@@ -39,8 +39,6 @@
 		to_chat(owner, span_notice("You activate your camouflage and blend into your surroundings..."))
 		cloaking = TRUE
 
-	return TRUE
-
 /**
  * Returns the owner's alpha value to its initial value,
  *
diff --git a/code/modules/antagonists/heretic/structures/carving_knife.dm b/code/modules/antagonists/heretic/structures/carving_knife.dm
index d7b24dbeb28..e444e5a639f 100644
--- a/code/modules/antagonists/heretic/structures/carving_knife.dm
+++ b/code/modules/antagonists/heretic/structures/carving_knife.dm
@@ -156,11 +156,7 @@
 	if(!length(target_sword.current_runes))
 		return FALSE
 
-/datum/action/item_action/rune_shatter/Trigger(trigger_flags)
-	. = ..()
-	if(!.)
-		return
-
+/datum/action/item_action/rune_shatter/do_effect(trigger_flags)
 	owner.playsound_local(get_turf(owner), 'sound/effects/magic/blind.ogg', 50, TRUE)
 	var/obj/item/melee/rune_carver/target_sword = target
 	QDEL_LIST(target_sword.current_runes)
diff --git a/code/modules/basketball/referee.dm b/code/modules/basketball/referee.dm
index c5157304558..1f8abd1d6d6 100644
--- a/code/modules/basketball/referee.dm
+++ b/code/modules/basketball/referee.dm
@@ -2,6 +2,7 @@
 	name = "referee whistle"
 	desc = "A referee whistle used to call fouls against players."
 	actions_types = list(/datum/action/innate/timeout)
+	action_slots = ALL
 
 // should be /datum/action/item_action but it doesn't support InterceptClickOn()
 /datum/action/innate/timeout
diff --git a/code/modules/clothing/belts/polymorph_belt.dm b/code/modules/clothing/belts/polymorph_belt.dm
index 8e1bfb0aed7..3bf7a8f7735 100644
--- a/code/modules/clothing/belts/polymorph_belt.dm
+++ b/code/modules/clothing/belts/polymorph_belt.dm
@@ -31,9 +31,6 @@
 	if (!active)
 		. += span_warning("It requires a Bioscrambler Anomaly Core in order to function.")
 
-/obj/item/polymorph_belt/item_action_slot_check(slot, mob/user, datum/action/action)
-	return slot & ITEM_SLOT_BELT
-
 /obj/item/polymorph_belt/update_icon_state()
 	icon_state = base_icon_state + (active ? "" : "_inactive")
 	worn_icon_state = base_icon_state + (active ? "" : "_inactive")
diff --git a/code/modules/clothing/chameleon/_chameleon_action.dm b/code/modules/clothing/chameleon/_chameleon_action.dm
index fbbe480e59a..448ebcc906e 100644
--- a/code/modules/clothing/chameleon/_chameleon_action.dm
+++ b/code/modules/clothing/chameleon/_chameleon_action.dm
@@ -173,10 +173,7 @@
 	else
 		atom_target.icon = initial(picked_item.icon)
 
-/datum/action/item_action/chameleon/change/Trigger(trigger_flags)
-	if(!IsAvailable(feedback = TRUE))
-		return FALSE
-
+/datum/action/item_action/chameleon/change/do_effect(trigger_flags)
 	select_look(owner)
 	return TRUE
 
diff --git a/code/modules/clothing/chameleon/chameleon_drone.dm b/code/modules/clothing/chameleon/chameleon_drone.dm
index dd50fc87108..a24e74ab959 100644
--- a/code/modules/clothing/chameleon/chameleon_drone.dm
+++ b/code/modules/clothing/chameleon/chameleon_drone.dm
@@ -3,10 +3,7 @@
 	button_icon = 'icons/mob/actions/actions_items.dmi'
 	button_icon_state = "random"
 
-/datum/action/item_action/chameleon/drone/randomise/Trigger(trigger_flags)
-	if(!IsAvailable(feedback = TRUE))
-		return FALSE
-
+/datum/action/item_action/chameleon/drone/randomise/do_effect(trigger_flags)
 	for(var/datum/action/item_action/chameleon/change/to_randomize in owner.actions)
 		to_randomize.random_look()
 	return TRUE
@@ -28,10 +25,7 @@
 /datum/action/item_action/chameleon/drone/togglehatmask/IsAvailable(feedback)
 	return ..() && isdrone(owner)
 
-/datum/action/item_action/chameleon/drone/togglehatmask/Trigger(trigger_flags)
-	if(!IsAvailable(feedback = TRUE))
-		return FALSE
-
+/datum/action/item_action/chameleon/drone/togglehatmask/do_effect(trigger_flags)
 	var/mob/living/basic/drone/droney = owner
 
 	// The drone unEquip() proc sets head to null after dropping
diff --git a/code/modules/clothing/chameleon/chameleon_scanner.dm b/code/modules/clothing/chameleon/chameleon_scanner.dm
index 8b213e3f816..6cd6e2e43ea 100644
--- a/code/modules/clothing/chameleon/chameleon_scanner.dm
+++ b/code/modules/clothing/chameleon/chameleon_scanner.dm
@@ -6,6 +6,7 @@
 	slot_flags = ITEM_SLOT_BELT
 	w_class = WEIGHT_CLASS_TINY
 	actions_types = list(/datum/action/item_action/chameleon/change/scanner)
+	action_slots = ALL
 	throw_speed = 3
 	/// Range that we can scan people
 	var/scan_range = 5
diff --git a/code/modules/clothing/chameleon/generic_chameleon_clothing.dm b/code/modules/clothing/chameleon/generic_chameleon_clothing.dm
index 69800031f73..b2aea379212 100644
--- a/code/modules/clothing/chameleon/generic_chameleon_clothing.dm
+++ b/code/modules/clothing/chameleon/generic_chameleon_clothing.dm
@@ -30,6 +30,7 @@ do { \
 	can_adjust = FALSE
 	armor_type = /datum/armor/clothing_under/chameleon
 	actions_types = list(/datum/action/item_action/chameleon/change/jumpsuit)
+	action_slots = ALL
 
 /obj/item/clothing/under/chameleon/broken
 
@@ -56,6 +57,7 @@ do { \
 	resistance_flags = NONE
 	armor_type = /datum/armor/suit_chameleon
 	actions_types = list(/datum/action/item_action/chameleon/change/suit)
+	action_slots = ALL
 
 /obj/item/clothing/suit/chameleon/Initialize(mapload)
 	. = ..()
@@ -84,6 +86,7 @@ do { \
 	resistance_flags = NONE
 	armor_type = /datum/armor/glasses_chameleon
 	actions_types = list(/datum/action/item_action/chameleon/change/glasses)
+	action_slots = ALL
 
 /obj/item/clothing/glasses/chameleon/broken
 
@@ -110,6 +113,7 @@ do { \
 	body_parts_covered = HANDS|ARMS
 	armor_type = /datum/armor/gloves_chameleon
 	actions_types = list(/datum/action/item_action/chameleon/change/gloves)
+	action_slots = ALL
 	clothing_traits = list(TRAIT_FAST_CUFFING)
 
 /obj/item/clothing/gloves/chameleon/broken
@@ -135,6 +139,7 @@ do { \
 	resistance_flags = NONE
 	armor_type = /datum/armor/head_chameleon
 	actions_types = list(/datum/action/item_action/chameleon/change/hat)
+	action_slots = ALL
 
 /obj/item/clothing/head/chameleon/broken
 
@@ -144,6 +149,7 @@ do { \
 
 /obj/item/clothing/head/chameleon/drone
 	actions_types = list(/datum/action/item_action/chameleon/change/hat, /datum/action/item_action/chameleon/drone/togglehatmask, /datum/action/item_action/chameleon/drone/randomise)
+	action_slots = ALL
 	item_flags = DROPDEL
 	// The camohat, I mean, holographic hat projection, is part of the drone itself.
 	armor_type = /datum/armor/none
@@ -176,6 +182,7 @@ do { \
 	flags_cover = MASKCOVERSEYES | MASKCOVERSMOUTH
 	w_class = WEIGHT_CLASS_SMALL
 	actions_types = list(/datum/action/item_action/chameleon/change/mask)
+	action_slots = ALL
 	/// Is our voice changer enabled or disabled?
 	var/voice_change = TRUE
 
@@ -191,6 +198,7 @@ do { \
 
 /obj/item/clothing/mask/chameleon/drone
 	actions_types = list(/datum/action/item_action/chameleon/change/mask, /datum/action/item_action/chameleon/drone/togglehatmask, /datum/action/item_action/chameleon/drone/randomise)
+	action_slots = ALL
 	item_flags = DROPDEL
 	//Same as the drone chameleon hat, undroppable and no protection
 	armor_type = /datum/armor/none
@@ -228,6 +236,7 @@ do { \
 	resistance_flags = NONE
 	armor_type = /datum/armor/shoes_chameleon
 	actions_types = list(/datum/action/item_action/chameleon/change/shoes)
+	action_slots = ALL
 
 /obj/item/clothing/shoes/chameleon/Initialize(mapload)
 	. = ..()
@@ -253,6 +262,7 @@ do { \
 /obj/item/storage/backpack/chameleon
 	name = "backpack"
 	actions_types = list(/datum/action/item_action/chameleon/change/backpack)
+	action_slots = ALL
 
 /obj/item/storage/backpack/chameleon/Initialize(mapload)
 	. = ..()
@@ -269,6 +279,7 @@ do { \
 	name = "toolbelt"
 	desc = "Holds tools."
 	actions_types = list(/datum/action/item_action/chameleon/change/belt)
+	action_slots = ALL
 
 /obj/item/storage/belt/chameleon/Initialize(mapload)
 	. = ..()
@@ -284,6 +295,7 @@ do { \
 /obj/item/radio/headset/chameleon
 	name = "radio headset"
 	actions_types = list(/datum/action/item_action/chameleon/change/headset)
+	action_slots = ALL
 
 /obj/item/radio/headset/chameleon/broken
 
@@ -295,6 +307,7 @@ do { \
 /obj/item/modular_computer/pda/chameleon
 	name = "tablet"
 	actions_types = list(/datum/action/item_action/chameleon/change/tablet)
+	action_slots = ALL
 
 /obj/item/modular_computer/pda/chameleon/broken
 
@@ -305,6 +318,7 @@ do { \
 // Cham Stamp
 /obj/item/stamp/chameleon
 	actions_types = list(/datum/action/item_action/chameleon/change/stamp)
+	action_slots = ALL
 
 /obj/item/stamp/chameleon/broken
 
@@ -325,6 +339,7 @@ do { \
 	armor_type = /datum/armor/neck_chameleon
 	w_class = WEIGHT_CLASS_SMALL
 	actions_types = list(/datum/action/item_action/chameleon/change/neck)
+	action_slots = ALL
 
 /obj/item/clothing/neck/chameleon/broken
 
diff --git a/code/modules/clothing/glasses/_glasses.dm b/code/modules/clothing/glasses/_glasses.dm
index 6f5e3220e2d..811c6f2bc34 100644
--- a/code/modules/clothing/glasses/_glasses.dm
+++ b/code/modules/clothing/glasses/_glasses.dm
@@ -130,10 +130,6 @@
 	fire = 80
 	acid = 100
 
-/obj/item/clothing/glasses/science/item_action_slot_check(slot)
-	if(slot & ITEM_SLOT_EYES)
-		return 1
-
 /obj/item/clothing/glasses/science/suicide_act(mob/living/carbon/user)
 	user.visible_message(span_suicide("[user] is tightening \the [src]'s straps around [user.p_their()] neck! It looks like [user.p_theyre()] trying to commit suicide!"))
 	return OXYLOSS
diff --git a/code/modules/clothing/head/moth.dm b/code/modules/clothing/head/moth.dm
index 48441d47578..9cfdd8470b0 100644
--- a/code/modules/clothing/head/moth.dm
+++ b/code/modules/clothing/head/moth.dm
@@ -16,6 +16,3 @@
 	. = ..()
 	AddComponent(/datum/component/scope, range_modifier = 1.2, zoom_method = ZOOM_METHOD_ITEM_ACTION, item_action_type = /datum/action/item_action/hands_free/moth_googles)
 	AddComponent(/datum/component/adjust_fishing_difficulty, -4)
-
-/obj/item/clothing/head/mothcap/original/item_action_slot_check(slot, mob/user, datum/action/action)
-	return (slot & ITEM_SLOT_HEAD)
diff --git a/code/modules/clothing/head/perceptomatrix.dm b/code/modules/clothing/head/perceptomatrix.dm
index abd17783692..f3be4abd459 100644
--- a/code/modules/clothing/head/perceptomatrix.dm
+++ b/code/modules/clothing/head/perceptomatrix.dm
@@ -120,9 +120,6 @@
 	if (!core_installed)
 		. += span_warning("It requires a hallucination anomaly core in order to function.")
 
-/obj/item/clothing/head/helmet/perceptomatrix/item_action_slot_check(slot, mob/user, datum/action/action)
-	return slot & ITEM_SLOT_HEAD
-
 /obj/item/clothing/head/helmet/perceptomatrix/update_icon_state()
 	icon_state = base_icon_state + (core_installed ? "" : "_inactive")
 	worn_icon_state = base_icon_state + (core_installed ? "" : "_inactive")
diff --git a/code/modules/clothing/masks/gasmask.dm b/code/modules/clothing/masks/gasmask.dm
index 2cb2ca66bb9..61dadbe96e6 100644
--- a/code/modules/clothing/masks/gasmask.dm
+++ b/code/modules/clothing/masks/gasmask.dm
@@ -292,7 +292,7 @@ GLOBAL_LIST_INIT(clown_mask_options, list(
 	flags_cover = MASKCOVERSEYES
 	clothing_traits = list(TRAIT_PERCEIVED_AS_CLOWN)
 	resistance_flags = FLAMMABLE
-	actions_types = list(/datum/action/item_action/adjust)
+	actions_types = list(/datum/action/item_action/adjust_style)
 	dog_fashion = /datum/dog_fashion/head/clown
 	var/list/clownmask_designs = list()
 	voice_filter = null // performer masks expect to be talked through
@@ -359,7 +359,7 @@ GLOBAL_LIST_INIT(clown_mask_options, list(
 	w_class = WEIGHT_CLASS_SMALL
 	flags_cover = MASKCOVERSEYES
 	resistance_flags = FLAMMABLE
-	actions_types = list(/datum/action/item_action/adjust)
+	actions_types = list(/datum/action/item_action/adjust_style)
 	species_exception = list(/datum/species/golem)
 	fishing_modifier = 0
 	var/list/mimemask_designs = list()
@@ -453,7 +453,7 @@ GLOBAL_LIST_INIT(clown_mask_options, list(
 	resistance_flags = FLAMMABLE
 	flags_cover = MASKCOVERSEYES
 	max_integrity = 100
-	actions_types = list(/datum/action/item_action/adjust)
+	actions_types = list(/datum/action/item_action/adjust_style)
 	dog_fashion = null
 	fishing_modifier = -4
 	var/list/tikimask_designs = list()
diff --git a/code/modules/clothing/masks/hailer.dm b/code/modules/clothing/masks/hailer.dm
index 182bc3ace76..02058117ca7 100644
--- a/code/modules/clothing/masks/hailer.dm
+++ b/code/modules/clothing/masks/hailer.dm
@@ -123,13 +123,7 @@ GLOBAL_LIST_INIT(hailer_phrases, list(
 		aggressiveness = AGGR_BROKEN
 		return
 
-/obj/item/clothing/mask/gas/sechailer/ui_action_click(mob/user, action)
-	if(istype(action, /datum/action/item_action/halt))
-		halt()
-	else
-		adjust_visor(user)
-
-/obj/item/clothing/mask/gas/sechailer/attack_self()
+/obj/item/clothing/mask/gas/sechailer/ui_action_click(mob/user, actiontype)
 	halt()
 
 /obj/item/clothing/mask/gas/sechailer/emag_act(mob/user, obj/item/card/emag/emag_card)
@@ -203,6 +197,7 @@ GLOBAL_LIST_INIT(hailer_phrases, list(
 	custom_price = PAYCHECK_COMMAND * 1.5
 	w_class = WEIGHT_CLASS_SMALL
 	actions_types = list(/datum/action/item_action/halt)
+	action_slots = ALL
 	COOLDOWN_DECLARE(whistle_cooldown)
 
 /obj/item/clothing/mask/whistle/ui_action_click(mob/user, action)
diff --git a/code/modules/clothing/suits/wiz_robe.dm b/code/modules/clothing/suits/wiz_robe.dm
index 0e3ca6131f2..a0381648a10 100644
--- a/code/modules/clothing/suits/wiz_robe.dm
+++ b/code/modules/clothing/suits/wiz_robe.dm
@@ -233,7 +233,6 @@
 	var/robe_charge = TRUE
 	actions_types = list(/datum/action/item_action/stickmen)
 
-
 /obj/item/clothing/suit/wizrobe/durathread
 	name = "durathread robe"
 	desc = "A rather dull durathread robe; not quite as protective as a proper piece of armour, but much more stylish."
diff --git a/code/modules/instruments/items.dm b/code/modules/instruments/items.dm
index d9225b8e905..0a6a08d2f19 100644
--- a/code/modules/instruments/items.dm
+++ b/code/modules/instruments/items.dm
@@ -199,6 +199,7 @@
 	force = 5
 	w_class = WEIGHT_CLASS_SMALL
 	actions_types = list(/datum/action/item_action/instrument)
+	action_slots = ALL
 
 /obj/item/instrument/harmonica/equipped(mob/user, slot, initial = FALSE)
 	. = ..()
@@ -223,12 +224,12 @@
 	name = "Use Instrument"
 	desc = "Use the instrument specified"
 
-/datum/action/item_action/instrument/Trigger(trigger_flags)
-	if(istype(target, /obj/item/instrument))
-		var/obj/item/instrument/I = target
-		I.interact(usr)
-		return
-	return ..()
+/datum/action/item_action/instrument/do_effect(trigger_flags)
+	if(!istype(target, /obj/item/instrument))
+		return FALSE
+	var/obj/item/instrument/instrument = target
+	instrument.interact(usr)
+	return TRUE
 
 /obj/item/instrument/bikehorn
 	name = "gilded bike horn"
diff --git a/code/modules/mining/equipment/kheiral_cuffs.dm b/code/modules/mining/equipment/kheiral_cuffs.dm
index 0f1e4f12fd8..65feee0f1e5 100644
--- a/code/modules/mining/equipment/kheiral_cuffs.dm
+++ b/code/modules/mining/equipment/kheiral_cuffs.dm
@@ -34,9 +34,6 @@
 	if(gps_enabled)
 		. += span_notice("The cuff's GPS signal is on.")
 
-/obj/item/kheiral_cuffs/item_action_slot_check(slot)
-	return (slot & ITEM_SLOT_GLOVES)
-
 /obj/item/kheiral_cuffs/equipped(mob/user, slot, initial)
 	. = ..()
 	if(!(slot & ITEM_SLOT_GLOVES))
diff --git a/code/modules/mining/equipment/kinetic_crusher/kinetic_crusher.dm b/code/modules/mining/equipment/kinetic_crusher/kinetic_crusher.dm
index 913bf9d1f75..b0774588b55 100644
--- a/code/modules/mining/equipment/kinetic_crusher/kinetic_crusher.dm
+++ b/code/modules/mining/equipment/kinetic_crusher/kinetic_crusher.dm
@@ -29,6 +29,7 @@
 	attack_verb_simple = list("smash", "crush", "cleave", "chop", "pulp")
 	sharpness = SHARP_EDGED
 	actions_types = list(/datum/action/item_action/toggle_light)
+	action_slots = ALL
 	obj_flags = UNIQUE_RENAME
 	light_system = OVERLAY_LIGHT
 	light_range = 5
diff --git a/code/modules/mining/lavaland/megafauna_loot.dm b/code/modules/mining/lavaland/megafauna_loot.dm
index 081359d173c..2ff6fc84840 100644
--- a/code/modules/mining/lavaland/megafauna_loot.dm
+++ b/code/modules/mining/lavaland/megafauna_loot.dm
@@ -60,6 +60,7 @@
 	hitsound = 'sound/items/weapons/sonic_jackhammer.ogg'
 	resistance_flags = LAVA_PROOF | FIRE_PROOF | ACID_PROOF
 	actions_types = list(/datum/action/item_action/vortex_recall)
+	action_slots = ALL
 	/// Linked teleport beacon for the group teleport functionality.
 	var/obj/effect/hierophant/beacon
 	/// TRUE if currently doing a teleport to the beacon, FALSE otherwise.
diff --git a/code/modules/mining/lavaland/tendril_loot.dm b/code/modules/mining/lavaland/tendril_loot.dm
index 31b9f064b1d..da8db9be0b7 100644
--- a/code/modules/mining/lavaland/tendril_loot.dm
+++ b/code/modules/mining/lavaland/tendril_loot.dm
@@ -148,9 +148,6 @@
 	resistance_flags = INDESTRUCTIBLE | LAVA_PROOF | FIRE_PROOF | UNACIDABLE | ACID_PROOF
 	var/mob/living/carbon/human/active_owner
 
-/obj/item/clothing/neck/necklace/memento_mori/item_action_slot_check(slot)
-	return (slot & ITEM_SLOT_NECK)
-
 /obj/item/clothing/neck/necklace/memento_mori/dropped(mob/user)
 	..()
 	if(active_owner)
@@ -216,12 +213,13 @@
 	name = "Memento Mori"
 	desc = "Bind your life to the pendant."
 
-/datum/action/item_action/hands_free/memento_mori/Trigger(trigger_flags)
-	var/obj/item/clothing/neck/necklace/memento_mori/MM = target
-	if(!MM.active_owner)
-		if(ishuman(owner))
-			MM.memento(owner)
-			Remove(MM.active_owner) //Remove the action button, since there's no real use in having it now.
+/datum/action/item_action/hands_free/memento_mori/do_effect(trigger_flags)
+	var/obj/item/clothing/neck/necklace/memento_mori/memento = target
+	if(memento.active_owner || !ishuman(owner))
+		return FALSE
+	memento.memento(owner)
+	Remove(memento.active_owner) //Remove the action button, since there's no real use in having it now.
+	return TRUE
 
 //Wisp Lantern
 /obj/item/wisp_lantern
diff --git a/code/modules/mob/inventory.dm b/code/modules/mob/inventory.dm
index fe5535c719d..8a4327454f7 100644
--- a/code/modules/mob/inventory.dm
+++ b/code/modules/mob/inventory.dm
@@ -561,9 +561,6 @@
 /mob/proc/getBackSlot()
 	return ITEM_SLOT_BACK
 
-/mob/proc/getBeltSlot()
-	return ITEM_SLOT_BELT
-
 //Inventory.dm is -kind of- an ok place for this I guess
 
 //This is NOT for dismemberment, as the user still technically has 2 "hands"
diff --git a/code/modules/mob/living/basic/drone/inventory.dm b/code/modules/mob/living/basic/drone/inventory.dm
index e63d370549d..f71d1619827 100644
--- a/code/modules/mob/living/basic/drone/inventory.dm
+++ b/code/modules/mob/living/basic/drone/inventory.dm
@@ -78,6 +78,3 @@
 
 /mob/living/basic/drone/getBackSlot()
 	return ITEM_SLOT_DEX_STORAGE
-
-/mob/living/basic/drone/getBeltSlot()
-	return ITEM_SLOT_DEX_STORAGE
diff --git a/code/modules/mob/living/basic/guardian/guardian_types/dextrous.dm b/code/modules/mob/living/basic/guardian/guardian_types/dextrous.dm
index 2b9d50f0854..fb6fa276d98 100644
--- a/code/modules/mob/living/basic/guardian/guardian_types/dextrous.dm
+++ b/code/modules/mob/living/basic/guardian/guardian_types/dextrous.dm
@@ -87,9 +87,6 @@
 /mob/living/basic/guardian/dextrous/getBackSlot()
 	return ITEM_SLOT_DEX_STORAGE
 
-/mob/living/basic/guardian/dextrous/getBeltSlot()
-	return ITEM_SLOT_DEX_STORAGE
-
 /mob/living/basic/guardian/dextrous/proc/update_inv_internal_storage()
 	if(isnull(internal_storage) || isnull(client) || !hud_used?.hud_shown)
 		return
diff --git a/code/modules/mob/living/carbon/human/species_types/dullahan.dm b/code/modules/mob/living/carbon/human/species_types/dullahan.dm
index 50ffe1925b3..d0207fc6119 100644
--- a/code/modules/mob/living/carbon/human/species_types/dullahan.dm
+++ b/code/modules/mob/living/carbon/human/species_types/dullahan.dm
@@ -196,16 +196,15 @@
 	name = "Toggle Perspective"
 	desc = "Switch between seeing normally from your head, or blindly from your body."
 
-/datum/action/item_action/organ_action/dullahan/Trigger(trigger_flags)
-	. = ..()
+/datum/action/item_action/organ_action/dullahan/do_effect(trigger_flags)
 	var/obj/item/organ/eyes/dullahan/dullahan_eyes = target
 	dullahan_eyes.tint = dullahan_eyes.tint ? NONE : INFINITY
-
-	if(ishuman(owner))
-		var/mob/living/carbon/human/human = owner
-		if(isdullahan(human))
-			var/datum/species/dullahan/dullahan_species = human.dna.species
-			dullahan_species.update_vision_perspective(human)
+	if(!isdullahan(owner))
+		return FALSE
+	var/mob/living/carbon/human/human = owner
+	var/datum/species/dullahan/dullahan_species = human.dna.species
+	dullahan_species.update_vision_perspective(human)
+	return TRUE
 
 
 /obj/item/dullahan_relay
diff --git a/code/modules/mob/living/carbon/human/species_types/monkeys.dm b/code/modules/mob/living/carbon/human/species_types/monkeys.dm
index bbb56a32fba..03b08a1dde5 100644
--- a/code/modules/mob/living/carbon/human/species_types/monkeys.dm
+++ b/code/modules/mob/living/carbon/human/species_types/monkeys.dm
@@ -153,11 +153,7 @@
 	background_icon_state = "bg_default_on"
 	overlay_icon_state = "bg_default_border"
 
-/datum/action/item_action/organ_action/toggle_trip/Trigger(trigger_flags)
-	. = ..()
-	if(!.)
-		return
-
+/datum/action/item_action/organ_action/toggle_trip/do_effect(trigger_flags)
 	var/obj/item/organ/brain/primate/monkey_brain = target
 	if(monkey_brain.tripping)
 		monkey_brain.tripping = FALSE
@@ -168,6 +164,7 @@
 		background_icon_state = "bg_default_on"
 		to_chat(monkey_brain.owner, span_notice("You will now stumble while colliding with people who are in combat mode."))
 	build_all_button_icons()
+	return TRUE
 
 /obj/item/organ/brain/primate/on_mob_insert(mob/living/carbon/primate)
 	. = ..()
diff --git a/code/modules/mob/living/carbon/human/species_types/vampire.dm b/code/modules/mob/living/carbon/human/species_types/vampire.dm
index 81d0f88b9b3..2c9bd61a401 100644
--- a/code/modules/mob/living/carbon/human/species_types/vampire.dm
+++ b/code/modules/mob/living/carbon/human/species_types/vampire.dm
@@ -154,45 +154,50 @@
 	name = "Drain Victim"
 	desc = "Leech blood from any carbon victim you are passively grabbing."
 
-/datum/action/item_action/organ_action/vampire/Trigger(trigger_flags)
-	. = ..()
-	if(iscarbon(owner))
-		var/mob/living/carbon/H = owner
-		var/obj/item/organ/tongue/vampire/V = target
-		if(!COOLDOWN_FINISHED(V, drain_cooldown))
-			to_chat(H, span_warning("You just drained blood, wait a few seconds!"))
-			return
-		if(H.pulling && iscarbon(H.pulling))
-			var/mob/living/carbon/victim = H.pulling
-			if(H.blood_volume >= BLOOD_VOLUME_MAXIMUM)
-				to_chat(H, span_warning("You're already full!"))
-				return
-			if(victim.stat == DEAD)
-				to_chat(H, span_warning("You need a living victim!"))
-				return
-			if(!victim.blood_volume || (victim.dna && (HAS_TRAIT(victim, TRAIT_NOBLOOD) || victim.dna.species.exotic_blood)))
-				to_chat(H, span_warning("[victim] doesn't have blood!"))
-				return
-			COOLDOWN_START(V, drain_cooldown, 3 SECONDS)
-			if(victim.can_block_magic(MAGIC_RESISTANCE_HOLY, charge_cost = 0))
-				victim.show_message(span_warning("[H] tries to bite you, but stops before touching you!"))
-				to_chat(H, span_warning("[victim] is blessed! You stop just in time to avoid catching fire."))
-				return
-			if(victim.has_reagent(/datum/reagent/consumable/garlic))
-				victim.show_message(span_warning("[H] tries to bite you, but recoils in disgust!"))
-				to_chat(H, span_warning("[victim] reeks of garlic! you can't bring yourself to drain such tainted blood."))
-				return
-			if(!do_after(H, 3 SECONDS, target = victim, hidden = TRUE))
-				return
-			var/blood_volume_difference = BLOOD_VOLUME_MAXIMUM - H.blood_volume //How much capacity we have left to absorb blood
-			var/drained_blood = min(victim.blood_volume, VAMP_DRAIN_AMOUNT, blood_volume_difference)
-			victim.show_message(span_danger("[H] is draining your blood!"))
-			to_chat(H, span_notice("You drain some blood!"))
-			playsound(H, 'sound/items/drink.ogg', 30, TRUE, -2)
-			victim.blood_volume = clamp(victim.blood_volume - drained_blood, 0, BLOOD_VOLUME_MAXIMUM)
-			H.blood_volume = clamp(H.blood_volume + drained_blood, 0, BLOOD_VOLUME_MAXIMUM)
-			if(!victim.blood_volume)
-				to_chat(H, span_notice("You finish off [victim]'s blood supply."))
+/datum/action/item_action/organ_action/vampire/do_effect(trigger_flags)
+	if(!iscarbon(owner))
+		return FALSE
+
+	var/mob/living/carbon/user = owner
+	var/obj/item/organ/tongue/vampire/licker_drinker = target
+	if(!COOLDOWN_FINISHED(licker_drinker, drain_cooldown))
+		to_chat(user, span_warning("You just drained blood, wait a few seconds!"))
+		return FALSE
+
+	if(!iscarbon(user.pulling))
+		return FALSE
+
+	var/mob/living/carbon/victim = user.pulling
+	if(user.blood_volume >= BLOOD_VOLUME_MAXIMUM)
+		to_chat(user, span_warning("You're already full!"))
+		return FALSE
+	if(victim.stat == DEAD)
+		to_chat(user, span_warning("You need a living victim!"))
+		return FALSE
+	if(!victim.blood_volume || (victim.dna && (HAS_TRAIT(victim, TRAIT_NOBLOOD) || victim.dna.species.exotic_blood)))
+		to_chat(user, span_warning("[victim] doesn't have blood!"))
+		return FALSE
+	COOLDOWN_START(licker_drinker, drain_cooldown, 3 SECONDS)
+	if(victim.can_block_magic(MAGIC_RESISTANCE_HOLY, charge_cost = 0))
+		victim.show_message(span_warning("[user] tries to bite you, but stops before touching you!"))
+		to_chat(user, span_warning("[victim] is blessed! You stop just in time to avoid catching fire."))
+		return FALSE
+	if(victim.has_reagent(/datum/reagent/consumable/garlic))
+		victim.show_message(span_warning("[user] tries to bite you, but recoils in disgust!"))
+		to_chat(user, span_warning("[victim] reeks of garlic! you can't bring yourself to drain such tainted blood."))
+		return FALSE
+	if(!do_after(user, 3 SECONDS, target = victim, hidden = TRUE))
+		return FALSE
+	var/blood_volume_difference = BLOOD_VOLUME_MAXIMUM - user.blood_volume //How much capacity we have left to absorb blood
+	var/drained_blood = min(victim.blood_volume, VAMP_DRAIN_AMOUNT, blood_volume_difference)
+	victim.show_message(span_danger("[user] is draining your blood!"))
+	to_chat(user, span_notice("You drain some blood!"))
+	playsound(user, 'sound/items/drink.ogg', 30, TRUE, -2)
+	victim.blood_volume = clamp(victim.blood_volume - drained_blood, 0, BLOOD_VOLUME_MAXIMUM)
+	user.blood_volume = clamp(user.blood_volume + drained_blood, 0, BLOOD_VOLUME_MAXIMUM)
+	if(!victim.blood_volume)
+		to_chat(user, span_notice("You finish off [victim]'s blood supply."))
+	return TRUE
 
 /obj/item/organ/heart/vampire
 	name = "vampire heart"
diff --git a/code/modules/mod/mod_actions.dm b/code/modules/mod/mod_actions.dm
index 2a2ed02c022..d0424d9682d 100644
--- a/code/modules/mod/mod_actions.dm
+++ b/code/modules/mod/mod_actions.dm
@@ -30,9 +30,7 @@
 		return
 	return ..()
 
-/datum/action/item_action/mod/Trigger(trigger_flags)
-	if(!IsAvailable(feedback = TRUE))
-		return FALSE
+/datum/action/item_action/mod/do_effect(trigger_flags)
 	var/obj/item/mod/control/mod = target
 	if(mod.malfunctioning && prob(75))
 		mod.balloon_alert(usr, "button malfunctions!")
@@ -44,7 +42,7 @@
 	desc = "LMB: Deploy/Undeploy part. RMB: Deploy/Undeploy full suit."
 	button_icon_state = "deploy"
 
-/datum/action/item_action/mod/deploy/Trigger(trigger_flags)
+/datum/action/item_action/mod/deploy/do_effect(trigger_flags)
 	. = ..()
 	if(!.)
 		return
@@ -64,7 +62,7 @@
 	/// First time clicking this will set it to TRUE, second time will activate it.
 	var/ready = FALSE
 
-/datum/action/item_action/mod/activate/Trigger(trigger_flags)
+/datum/action/item_action/mod/activate/do_effect(trigger_flags)
 	. = ..()
 	if(!.)
 		return
@@ -92,7 +90,7 @@
 	desc = "Toggle a MODsuit module."
 	button_icon_state = "module"
 
-/datum/action/item_action/mod/module/Trigger(trigger_flags)
+/datum/action/item_action/mod/module/do_effect(trigger_flags)
 	. = ..()
 	if(!.)
 		return
@@ -107,7 +105,7 @@
 	desc = "Open the MODsuit's panel."
 	button_icon_state = "panel"
 
-/datum/action/item_action/mod/panel/Trigger(trigger_flags)
+/datum/action/item_action/mod/panel/do_effect(trigger_flags)
 	. = ..()
 	if(!.)
 		return
@@ -180,7 +178,7 @@
 	pinner = null
 	return ..()
 
-/datum/action/item_action/mod/pinnable/module/Trigger(trigger_flags)
+/datum/action/item_action/mod/pinnable/module/do_effect(trigger_flags)
 	. = ..()
 	if(!.)
 		return
diff --git a/code/modules/mod/mod_control.dm b/code/modules/mod/mod_control.dm
index c7fcb0b1ede..dbb2d5d0777 100644
--- a/code/modules/mod/mod_control.dm
+++ b/code/modules/mod/mod_control.dm
@@ -201,10 +201,6 @@
 		return
 	clean_up()
 
-/obj/item/mod/control/item_action_slot_check(slot)
-	if(slot & slot_flags)
-		return TRUE
-
 // Grant pinned actions to pin owners, gives AI pinned actions to the AI and not the wearer
 /obj/item/mod/control/grant_action_to_bearer(datum/action/action)
 	if (!istype(action, /datum/action/item_action/mod/pinnable))
diff --git a/code/modules/mod/modules/module_pathfinder.dm b/code/modules/mod/modules/module_pathfinder.dm
index 487844bc2a0..f33088db5a8 100644
--- a/code/modules/mod/modules/module_pathfinder.dm
+++ b/code/modules/mod/modules/module_pathfinder.dm
@@ -182,10 +182,7 @@
 		qdel(src)
 		return
 
-/datum/action/item_action/mod_recall/Trigger(trigger_flags)
-	. = ..()
-	if(!.)
-		return
+/datum/action/item_action/mod_recall/do_effect(trigger_flags)
 	var/obj/item/implant/mod/implant = target
 	if(!COOLDOWN_FINISHED(src, recall_cooldown))
 		implant.balloon_alert(implant.imp_in, "on cooldown!")
diff --git a/code/modules/projectiles/gun.dm b/code/modules/projectiles/gun.dm
index 832be59bb20..4f7182d7fbb 100644
--- a/code/modules/projectiles/gun.dm
+++ b/code/modules/projectiles/gun.dm
@@ -21,6 +21,7 @@
 	item_flags = NEEDS_PERMIT
 	attack_verb_continuous = list("strikes", "hits", "bashes")
 	attack_verb_simple = list("strike", "hit", "bash")
+	action_slots = ALL
 
 	var/gun_flags = NONE
 	var/fire_sound = 'sound/items/weapons/gun/pistol/shot.ogg'
diff --git a/code/modules/research/xenobiology/crossbreeding/_clothing.dm b/code/modules/research/xenobiology/crossbreeding/_clothing.dm
index caaafd05642..5f92ec2cb55 100644
--- a/code/modules/research/xenobiology/crossbreeding/_clothing.dm
+++ b/code/modules/research/xenobiology/crossbreeding/_clothing.dm
@@ -38,6 +38,7 @@ Slimecrossing Armor
 	icon = 'icons/obj/science/slimecrossing.dmi'
 	icon_state = "prismglasses"
 	actions_types = list(/datum/action/item_action/change_prism_colour, /datum/action/item_action/place_light_prism)
+
 	forced_glass_color = TRUE
 	var/glasses_color = COLOR_WHITE
 
@@ -45,10 +46,6 @@ Slimecrossing Armor
 	. = ..()
 	AddElement(/datum/element/wearable_client_colour, /datum/client_colour/glass_colour, ITEM_SLOT_EYES, glasses_color, forced_glass_color)
 
-/obj/item/clothing/glasses/prism_glasses/item_action_slot_check(slot)
-	if(slot & ITEM_SLOT_EYES)
-		return TRUE
-
 /obj/structure/light_prism
 	name = "light prism"
 	desc = "A shining crystal of semi-solid light. Looks fragile."
@@ -74,9 +71,7 @@ Slimecrossing Armor
 	button_icon = 'icons/obj/science/slimecrossing.dmi'
 	button_icon_state = "prismcolor"
 
-/datum/action/item_action/change_prism_colour/Trigger(trigger_flags)
-	if(!IsAvailable(feedback = TRUE))
-		return
+/datum/action/item_action/change_prism_colour/do_effect(trigger_flags)
 	var/obj/item/clothing/glasses/prism_glasses/glasses = target
 	var/new_color = input(owner, "Choose the lens color:", "Color change",glasses.glasses_color) as color|null
 	if(!new_color)
@@ -90,9 +85,7 @@ Slimecrossing Armor
 	button_icon = 'icons/obj/science/slimecrossing.dmi'
 	button_icon_state = "lightprism"
 
-/datum/action/item_action/place_light_prism/Trigger(trigger_flags)
-	if(!IsAvailable(feedback = TRUE))
-		return
+/datum/action/item_action/place_light_prism/do_effect(trigger_flags)
 	var/obj/item/clothing/glasses/prism_glasses/glasses = target
 	if(locate(/obj/structure/light_prism) in get_turf(owner))
 		to_chat(owner, span_warning("There isn't enough ambient energy to fabricate another light prism here."))
diff --git a/code/modules/surgery/dental_implant.dm b/code/modules/surgery/dental_implant.dm
index 674f5803f57..aa37607e76f 100644
--- a/code/modules/surgery/dental_implant.dm
+++ b/code/modules/surgery/dental_implant.dm
@@ -75,9 +75,7 @@
 		return FALSE
 	return ..()
 
-/datum/action/item_action/activate_pill/Trigger(trigger_flags)
-	if(!..())
-		return FALSE
+/datum/action/item_action/activate_pill/do_effect(trigger_flags)
 	owner.balloon_alert_to_viewers("[owner] grinds their teeth!", "You grit your teeth.")
 	if(!do_after(owner, owner.stat * (2.5 SECONDS), owner,  IGNORE_USER_LOC_CHANGE | IGNORE_INCAPACITATED))
 		return FALSE
diff --git a/code/modules/surgery/organs/internal/cyberimp/augments_eyes.dm b/code/modules/surgery/organs/internal/cyberimp/augments_eyes.dm
index cdb881f02dd..525400b5419 100644
--- a/code/modules/surgery/organs/internal/cyberimp/augments_eyes.dm
+++ b/code/modules/surgery/organs/internal/cyberimp/augments_eyes.dm
@@ -11,12 +11,11 @@
 	name = "HUD implant"
 	desc = "These cybernetic eyes will display a HUD over everything you see. Maybe."
 	slot = ORGAN_SLOT_HUD
-	actions_types = list(/datum/action/item_action/toggle_hud)
+	actions_types = list(/datum/action/item_action/organ_action/toggle_hud)
 	var/HUD_traits = list()
 	/// Whether the HUD implant is on or off
 	var/toggled_on = TRUE
 
-
 /obj/item/organ/cyberimp/eyes/hud/proc/toggle_hud(mob/living/carbon/eye_owner)
 	if(toggled_on)
 		toggled_on = FALSE
diff --git a/code/modules/surgery/organs/internal/vocal_cords/_vocal_cords.dm b/code/modules/surgery/organs/internal/vocal_cords/_vocal_cords.dm
index 8dfee796937..fd626603d4d 100644
--- a/code/modules/surgery/organs/internal/vocal_cords/_vocal_cords.dm
+++ b/code/modules/surgery/organs/internal/vocal_cords/_vocal_cords.dm
@@ -56,16 +56,14 @@
 			return FALSE
 	return TRUE
 
-/datum/action/item_action/organ_action/colossus/Trigger(trigger_flags)
-	. = ..()
-	if(!.)
-		return
+/datum/action/item_action/organ_action/colossus/do_effect(trigger_flags)
 	var/command = tgui_input_text(owner, "Speak with the Voice of God", "Command", max_length = MAX_MESSAGE_LEN)
 	if(!command)
-		return
+		return FALSE
 	if(QDELETED(src) || QDELETED(owner))
-		return
+		return FALSE
 	owner.say(".x[command]")
+	return TRUE
 
 /obj/item/organ/vocal_cords/colossus/can_speak_with()
 	if(!owner)
@@ -98,15 +96,14 @@
 	actions_types = list(/datum/action/item_action/organ_action/use/adamantine_vocal_cords)
 	icon_state = "adamantine_cords"
 
-/datum/action/item_action/organ_action/use/adamantine_vocal_cords/Trigger(trigger_flags)
-	if(!IsAvailable(feedback = TRUE))
-		return
+/datum/action/item_action/organ_action/use/adamantine_vocal_cords/do_effect(trigger_flags)
 	var/message = tgui_input_text(owner, "Resonate a message to all nearby golems", "Resonate", max_length = MAX_MESSAGE_LEN)
 	if(!message)
-		return
+		return FALSE
 	if(QDELETED(src) || QDELETED(owner))
-		return
+		return FALSE
 	owner.say(".x[message]")
+	return TRUE
 
 /obj/item/organ/vocal_cords/adamantine/handle_speech(message)
 	var/msg = span_resonate("[span_name("[owner.real_name]")] resonates, \"[message]\"")
diff --git a/code/modules/wiremod/shell/module.dm b/code/modules/wiremod/shell/module.dm
index 14092f5d2c8..bec6ce8e5c7 100644
--- a/code/modules/wiremod/shell/module.dm
+++ b/code/modules/wiremod/shell/module.dm
@@ -114,17 +114,17 @@
 
 	return ..()
 
-/datum/action/item_action/mod/pinnable/circuit/Trigger(trigger_flags)
+/datum/action/item_action/mod/pinnable/circuit/do_effect(trigger_flags)
 	. = ..()
 	if(!.)
 		return
 	var/obj/item/mod/control/mod = module.mod
 	if(!istype(mod))
-		return
+		return FALSE
 	if(!mod.active || mod.activating)
 		if(mod.wearer)
 			module.balloon_alert(mod.wearer, "not active!")
-		return
+		return FALSE
 	circuit_component.user.set_output(owner)
 	circuit_component.signal.set_output(COMPONENT_SIGNAL)