conflict resolution

code/modules/mob/dead/observer/observer.dm

@@ -232,7 +232,8 @@ This is the proc mobs get to turn into a ghost. Forked from ghostize due to comp
 			response = alert(src, "Are you -sure- you want to ghost?\n(You are alive, or otherwise have the potential to become alive. If you ghost, you won't be able to play this round until you respawn as a new character! You can't change your mind so choose wisely!)", "Are you sure you want to ghost?", "Ghost", "Stay in body")
 		if(response != "Ghost")
 			return
-		resting = 1
+		if(!resting)
+			lay_down()
 		var/turf/location = get_turf(src)
 		var/special_role = check_special_role()
 		if(!istype(loc,/obj/machinery/cryopod))

code/modules/mob/living/carbon/human/human.dm

@@ -1117,6 +1117,8 @@
 
 	//icon_state = lowertext(species.name) //Necessary?
 
+	dexterity = species.dexterity
+
 	species.create_organs(src)
 
 	species.handle_post_spawn(src)

code/modules/mob/living/carbon/human/human_defines.dm

@@ -154,3 +154,5 @@
 
 	// Custom Species Name
 	var/custom_species
+
+	dexterity = MOB_DEXTERITY_FULL

code/modules/mob/living/carbon/human/species/species.dm

@@ -274,6 +274,9 @@
 	var/icon_height = 32
 	var/agility = 20 //prob() to do agile things
 
+	/// One of MOB_DEXTERITY_* - the dexterity level of this species for using objects.
+	var/dexterity = MOB_DEXTERITY_FULL
+
 /datum/species/proc/update_attack_types()
 	unarmed_attacks = list()
 	for(var/u_type in unarmed_types)

code/modules/mob/living/carbon/human/species/station/monkey.dm

@@ -54,6 +54,8 @@
 		BP_R_FOOT = list("path" = /obj/item/organ/external/foot/right)
 		)
 
+	dexterity = MOB_DEXTERITY_KEYBOARDS
+
 /datum/species/monkey/handle_npc(var/mob/living/carbon/human/H)
 	if(H.stat != CONSCIOUS)
 		return

code/modules/mob/living/carbon/human/species/xenomorphs/alien_species.dm

@@ -79,6 +79,9 @@
 		BP_R_FOOT = list("path" = /obj/item/organ/external/foot/right/unseverable/xeno)
 		)
 
+	dexterity = MOB_DEXTERITY_NONE
+
+
 /datum/species/xenos/get_bodytype()
 	return SPECIES_XENO
 

code/modules/mob/living/silicon/silicon.dm

@@ -27,6 +27,8 @@
 
 	var/hudmode = null
 
+	dexterity = MOB_DEXTERITY_FULL
+
 /mob/living/silicon/Initialize()
 	silicon_mob_list |= src
 	. = ..()
@@ -419,4 +421,4 @@
 	return 0 //NOT REAL EYES
 
 /mob/living/silicon/can_feed()
-	return FALSE
+	return FALSE

code/modules/mob/living/simple_mob/simple_mob.dm

@@ -101,6 +101,7 @@
 	var/list/attacktext = list("attacked") // "You are [attacktext] by the mob!"
 	var/list/friendly = list("nuzzles") // "The mob [friendly] the person."
 	var/attack_sound = null				// Sound to play when I attack
+	var/scratch_sound //! Sound to play when I scratch at a door
 	var/melee_miss_chance = 0			// percent chance to miss a melee attack.
 	var/attack_armor_type = "melee"		// What armor does this check?
 	var/attack_armor_pen = 0			// How much armor pen this attack has.

code/modules/mob/living/simple_mob/subtypes/animal/sif/grafadreka_harness.dm

@@ -37,47 +37,48 @@
 	QDEL_NULL(attached_radio)
 	QDEL_NULL(attached_gps)
 	QDEL_NULL(attached_plate)
-	. = ..()
+	return ..()
 
-/obj/item/storage/internal/animal_harness/attackby(obj/item/W, mob/user)
 
-	// Sanity check for some stuff below.
-	if(!istype(loc, /mob/living/simple_mob/animal/sif/grafadreka/trained))
+/obj/item/storage/internal/animal_harness/attackby(obj/item/W, mob/user, silent)
+	if (user == loc) // Drakes can't attach stuff to themselves, only shove it in their storage.
 		return ..()
-
-	// Attach a tracker.
-	if(istype(W, /obj/item/gps))
-		if(attached_gps)
-			to_chat(user, SPAN_WARNING("There is already \a [attached_gps] attached to \the [loc]'s harness."))
-		else if(user.unEquip(W))
+	if (!istype(loc, /mob/living/simple_mob/animal/sif/grafadreka/trained)) // Only allow attaching behaviors when worn by an appropriate subject.
+		return ..()
+	if (istype(W, /obj/item/gps)) // Attach a tracker.
+		if (attached_gps)
+			if (!silent)
+				to_chat(user, SPAN_WARNING("There is already \a [attached_gps] attached to \the [loc]'s harness."))
+		else if (user.unEquip(W))
 			W.forceMove(loc)
-			user.visible_message(SPAN_NOTICE("\The [user] attaches \the [W] to \the [loc]'s harness."))
+			if (!silent)
+				user.visible_message(SPAN_NOTICE("\The [user] attaches \the [W] to \the [loc]'s harness."))
 			attached_gps = W
 		return TRUE
-
-	// Attach a radio.
-	if(istype(W, /obj/item/radio))
-		if(attached_radio)
-			to_chat(user, SPAN_WARNING("There is already \a [attached_radio] attached to \the [loc]'s harness."))
-		else if(user.unEquip(W))
+	if (istype(W, /obj/item/radio)) // Attach a radio.
+		if (attached_radio)
+			if (!silent)
+				to_chat(user, SPAN_WARNING("There is already \a [attached_radio] attached to \the [loc]'s harness."))
+		else if (user.unEquip(W))
 			W.forceMove(loc)
-			user.visible_message(SPAN_NOTICE("\The [user] attaches \the [W] to \the [loc]'s harness."))
+			if (!silent)
+				user.visible_message(SPAN_NOTICE("\The [user] attaches \the [W] to \the [loc]'s harness."))
 			attached_radio = W
 		return TRUE
-
-	// Attach an armor plate.
-	if(istype(W, /obj/item/clothing/accessory/armor) || istype(W, /obj/item/clothing/accessory/material/makeshift))
-		if(attached_plate)
-			to_chat(user, SPAN_WARNING("There is already \a [attached_plate] inside \the [loc]'s harness."))
-		else if(user.unEquip(W))
+	if (istype(W, /obj/item/clothing/accessory/armor) || istype(W, /obj/item/clothing/accessory/material/makeshift)) // Attach an armor plate.
+		if (attached_plate)
+			if (!silent)
+				to_chat(user, SPAN_WARNING("There is already \a [attached_plate] inside \the [loc]'s harness."))
+		else if (user.unEquip(W))
 			W.forceMove(loc)
-			user.visible_message(SPAN_NOTICE("\The [user] secures \the [W] inside \the [loc]'s harness."))
+			if (!silent)
+				user.visible_message(SPAN_NOTICE("\The [user] secures \the [W] inside \the [loc]'s harness."))
 			attached_plate = W
 			var/mob/living/simple_mob/animal/sif/grafadreka/trained/drake = loc
 			drake.recalculate_armor()
 		return TRUE
+	return ..()
 
-	. = ..()
 
 /mob/living/simple_mob/animal/sif/grafadreka/trained/proc/recalculate_armor()
 	armor = list()

code/modules/mob/living/simple_mob/subtypes/animal/sif/grafadreka_trained.dm

@@ -2,117 +2,297 @@
 	desc = "A large, sleek snow drake with heavy claws, powerful jaws and many pale spines along its body. This one is wearing some kind of harness; maybe it belongs to someone."
 	player_msg = "You are a large Sivian pack predator in symbiosis with the local bioluminescent bacteria. You can eat glowing \
 	tree fruit to fuel your <b>ranged spitting attack</b> and <b>poisonous bite</b> (on <span class = 'danger'>harm intent</span>), as well as <b>healing saliva</b> \
-	(on <b><font color = '#009900'>help intent</font></b>).<br>Unlike your wild kin, you are <b>trained</b> and work happily with your two-legged packmates."
+	(on <b><font color = '#009900'>help intent</font></b>).<br>Using <font color='#e0a000'>grab intent</font> you can pick up and drop items on by clicking them or yourself, \
+	and can interact with some simple machines like buttons and levers.<br>Unlike your wild kin, you are <b>trained</b> and work happily with your two-legged packmates."
 	faction = "station"
 	ai_holder_type = null // These guys should not exist without players.
 	gender = PLURAL // Will take gender from prefs = set to non-NEUTER here to avoid randomizing in Initialize().
+	movement_cooldown = 1.5 // ~Red~ trained ones go faster.
+	dexterity = MOB_DEXTERITY_SIMPLE_MACHINES
+
+	/// If a valid harness path, the harness this drake will be wearing on Initialize.
 	var/obj/item/storage/internal/animal_harness/harness = /obj/item/storage/internal/animal_harness
 
-/mob/living/simple_mob/animal/sif/grafadreka/trained/Initialize()
-	if(ispath(harness))
-		harness = new harness(src)
-		harness.attached_radio = new /obj/item/radio(src)
-		regenerate_harness_verbs()
-	. = ..()
+	/// On clicking with an item, stuff that should use behaviors instead of being placed in storage.
+	var/static/list/allow_type_to_pass = list(
+		/obj/item/healthanalyzer,
+		/obj/item/stack/medical,
+		/obj/item/reagent_containers/syringe
+	)
+
+	/// A type path -> proc path mapping for objects that drakes can use.
+	var/static/list/interactable_objects = list(
+		/obj/machinery/button = /mob/living/simple_mob/animal/sif/grafadreka/trained/proc/InteractButtonBasic,
+		/obj/machinery/access_button = /mob/living/simple_mob/animal/sif/grafadreka/trained/proc/InteractButtonAccess,
+		/obj/machinery/firealarm = /mob/living/simple_mob/animal/sif/grafadreka/trained/proc/InteractFireAlarm,
+		/obj/machinery/conveyor_switch = /mob/living/simple_mob/animal/sif/grafadreka/trained/proc/InteractConveyorSwitch
+	)
+
 
 /mob/living/simple_mob/animal/sif/grafadreka/trained/Destroy()
-	if(istype(harness))
+	if (istype(harness))
 		QDEL_NULL(harness)
 	return ..()
 
+
+/mob/living/simple_mob/animal/sif/grafadreka/trained/Initialize()
+	. = ..()
+	if (ispath(harness, /obj/item/storage/internal/animal_harness))
+		harness = new harness(src)
+		harness.attached_radio = new /obj/item/radio(src)
+		regenerate_harness_verbs()
+	else
+		if (harness)
+			log_error("[type] initialized with an invalid harness [harness]")
+		harness = null
+
+
 /mob/living/simple_mob/animal/sif/grafadreka/trained/examine(mob/living/user)
 	. = ..()
-	if(harness)
+	if (harness)
 		. += "\The [src] is wearing \a [harness]."
-		for(var/obj/item/thing in list(harness.attached_gps, harness.attached_plate, harness.attached_radio))
+		for (var/obj/item/thing in list(harness.attached_gps, harness.attached_plate, harness.attached_radio))
 			. += "There is \a [thing] attached."
 
+
 /mob/living/simple_mob/animal/sif/grafadreka/trained/add_glow()
 	. = ..()
-	if(. && harness)
+	if (. && harness)
 		var/image/I = .
 		I.icon_state = "[I.icon_state]-pannier"
 
+
 /mob/living/simple_mob/animal/sif/grafadreka/trained/Logout()
 	..()
-	if(stat != DEAD)
+	if (stat != DEAD)
 		lying = TRUE
 		resting = TRUE
 		sitting = FALSE
 		Sleeping(2)
 		update_icon()
 
+
 /mob/living/simple_mob/animal/sif/grafadreka/trained/Login()
 	..()
 	SetSleeping(0)
 	update_icon()
 
-/mob/living/simple_mob/animal/sif/grafadreka/trained/attack_hand(mob/living/L)
+
+/mob/living/simple_mob/animal/sif/grafadreka/trained/attack_hand(mob/living/user)
 	// Permit headpats/smacks
-	if(!harness || L.a_intent == I_HURT || (L.a_intent == I_HELP && L.zone_sel?.selecting == BP_HEAD))
+	if (!harness || user.a_intent == I_HURT || (user.a_intent == I_HELP && user.zone_sel?.selecting == BP_HEAD))
 		return ..()
-	return harness.handle_attack_hand(L)
+	return harness.handle_attack_hand(user)
+
 
 // universal_understand is buggy and produces double lines, so we'll just do this hack instead.
-/mob/living/simple_mob/animal/sif/grafadreka/trained/say_understands(var/mob/other, var/datum/language/speaking = null)
-	if(!speaking || speaking.name == LANGUAGE_GALCOM)
+/mob/living/simple_mob/animal/sif/grafadreka/trained/say_understands(mob/other, datum/language/speaking)
+	if (!speaking || speaking.name == LANGUAGE_GALCOM)
 		return TRUE
 	return ..()
 
+
 /mob/living/simple_mob/animal/sif/grafadreka/trained/update_icon()
 	. = ..()
-	if(harness)
+	if (harness)
 		var/image/I = image(icon, "[current_icon_state]-pannier")
 		I.color = harness.color
 		I.appearance_flags |= (RESET_COLOR|PIXEL_SCALE|KEEP_APART)
-		if(offset_compiled_icon)
+		if (offset_compiled_icon)
 			I.pixel_x = offset_compiled_icon
 		add_overlay(I)
 
-/mob/living/simple_mob/animal/sif/grafadreka/trained/attackby(obj/item/O, mob/user)
 
+/mob/living/simple_mob/animal/sif/grafadreka/trained/attackby(obj/item/item, mob/user)
 	// bonk
-	if(user.a_intent == I_HURT)
+	if (user.a_intent == I_HURT)
 		return ..()
-
-	// Pass some items down to heal or run injection etc.
-	var/static/list/allow_type_to_pass = list(
-		/obj/item/healthanalyzer,
-		/obj/item/stack/medical,
-		/obj/item/reagent_containers/syringe
-	)
-	if(user.a_intent == I_HELP)
-		for(var/pass_type in allow_type_to_pass)
-			if(istype(O, pass_type))
+	if (user.a_intent == I_HELP)
+		for (var/pass_type in allow_type_to_pass)
+			if (istype(item, pass_type))
 				return ..()
-
 	// Open our storage, if we have it.
-	if(harness?.attackby(O, user))
+	if (harness?.attackby(item, user))
 		regenerate_harness_verbs()
 		return TRUE
-
 	return ..()
 
+
 /mob/living/simple_mob/animal/sif/grafadreka/trained/proc/regenerate_harness_verbs()
-	if(!harness)
+	if (!harness)
 		verbs -= list(
 			/mob/living/simple_mob/animal/sif/grafadreka/trained/proc/remove_attached_gps,
 			/mob/living/simple_mob/animal/sif/grafadreka/trained/proc/remove_attached_plate,
 			/mob/living/simple_mob/animal/sif/grafadreka/trained/proc/remove_attached_radio
 		)
 		return
-
-	if(harness.attached_gps)
+	if (harness.attached_gps)
 		verbs |= /mob/living/simple_mob/animal/sif/grafadreka/trained/proc/remove_attached_gps
 	else
 		verbs -= /mob/living/simple_mob/animal/sif/grafadreka/trained/proc/remove_attached_gps
-
-	if(harness.attached_plate)
+	if (harness.attached_plate)
 		verbs |= /mob/living/simple_mob/animal/sif/grafadreka/trained/proc/remove_attached_plate
 	else
 		verbs -= /mob/living/simple_mob/animal/sif/grafadreka/trained/proc/remove_attached_plate
-
-	if(harness.attached_radio)
+	if (harness.attached_radio)
 		verbs |= /mob/living/simple_mob/animal/sif/grafadreka/trained/proc/remove_attached_radio
 	else
 		verbs -= /mob/living/simple_mob/animal/sif/grafadreka/trained/proc/remove_attached_radio
+
+
+/mob/living/simple_mob/animal/sif/grafadreka/trained/attack_target(atom/atom)
+	if (a_intent == I_GRAB)
+		if (atom == src)
+			return DropItem()
+		if (isobj(atom))
+			var/interact_outcome = AttemptInteract(atom)
+			if (!isnull(interact_outcome))
+				return interact_outcome
+			if (isitem(atom))
+				return CollectItem(atom)
+	return ..()
+
+
+/mob/living/simple_mob/animal/sif/grafadreka/trained/proc/DropItem()
+	if (!length(harness?.contents))
+		to_chat(src, SPAN_WARNING("You have nothing to drop."))
+		return ATTACK_FAILED
+	var/list/attached = list(harness.attached_gps, harness.attached_radio, harness.attached_plate)
+	var/obj/item/response = input(src, "Select an item to drop:") as null | anything in attached + harness.contents
+	if (!response)
+		return ATTACK_FAILED
+	var/datum/gender/gender = gender_datums[get_visible_gender()]
+	var/is_special = (response in attached)
+	if (is_special)
+		visible_message(
+			SPAN_ITALIC("\The [src] begins tugging at \the [response] on [gender.his] harness."),
+			SPAN_ITALIC("You begin tugging \the [response] off your harness."),
+			SPAN_ITALIC("You hear something rustling."),
+			runemessage = CHAT_MESSAGE_DEFAULT_ACTION
+		)
+	else
+		visible_message(
+			SPAN_ITALIC("\The [src] begins rooting around in the pouch on [gender.his] harness."),
+			SPAN_ITALIC("You begin working \the [response] out of your harness pouch."),
+			SPAN_ITALIC("You hear something rustling."),
+			runemessage = CHAT_MESSAGE_DEFAULT_ACTION
+		)
+	if (!do_after(src, 5 SECONDS, ignore_movement = TRUE))
+		return ATTACK_FAILED
+	if (is_special)
+		if (!(response in src))
+			to_chat(src, SPAN_WARNING("\The [response] is already gone!"))
+			return ATTACK_FAILED
+		if (response == harness.attached_gps)
+			harness.attached_gps = null
+		else if (response == harness.attached_radio)
+			harness.attached_radio = null
+		else if (response == harness.attached_plate)
+			harness.attached_plate = null
+		response.dropInto(loc)
+		regenerate_harness_verbs()
+	else
+		harness.remove_from_storage(response, loc)
+	visible_message(
+		SPAN_ITALIC("\The [src] pulls \a [response] from [gender.his] harness and drops it."),
+		SPAN_NOTICE("You pull \the [response] from your harness and drop it."),
+		SPAN_WARNING("Clank!"),
+		runemessage = CHAT_MESSAGE_DEFAULT_ACTION
+	)
+	return ATTACK_SUCCESSFUL
+
+
+/mob/living/simple_mob/animal/sif/grafadreka/trained/proc/CollectItem(obj/item/item)
+	if (!item.simulated || item.abstract || !item.Adjacent(src))
+		return ATTACK_FAILED
+	if (!harness)
+		to_chat(src, SPAN_WARNING("Your harness is missing; you cannot store \the [item]."))
+		return ATTACK_FAILED
+	if (item.anchored)
+		to_chat(src, SPAN_WARNING("\The [item] is securely anchored; you can't take it."))
+		return ATTACK_FAILED
+	face_atom(item)
+	if (!do_after(src, 5 SECONDS, item))
+		return ATTACK_FAILED
+	var/datum/gender/gender = gender_datums[get_visible_gender()]
+	if (harness?.attackby(item, src, TRUE))
+		visible_message(
+			SPAN_ITALIC("\The [src] grabs \a [item] in [gender.his] teeth and noses it into [gender.his] harness pouch."),
+			SPAN_NOTICE("You grab \the [item] in your teeth and push it into your harness pouch."),
+			SPAN_ITALIC("You hear something rustling."),
+			runemessage = CHAT_MESSAGE_DEFAULT_ACTION
+		)
+		return ATTACK_SUCCESSFUL
+	to_chat(src, SPAN_WARNING("There's not enough space in your harness pouch for \the [item] to fit!"))
+	return ATTACK_FAILED
+
+
+/mob/living/simple_mob/animal/sif/grafadreka/trained/proc/AttemptInteract(obj/obj)
+	if (!obj.Adjacent(src))
+		return
+	var/handler
+	for (var/type in interactable_objects)
+		if (ispath(obj.type, type))
+			handler = interactable_objects[type]
+			break
+	if (!handler)
+		return
+	return call(src, handler)(obj)
+
+
+/mob/living/simple_mob/animal/sif/grafadreka/trained/proc/InteractButtonBasic(obj/machinery/button/button)
+	var/datum/gender/gender = gender_datums[get_visible_gender()]
+	visible_message(
+		SPAN_ITALIC("\The [src] stands up awkwardly on [gender.his] hind legs and paws at \a [button]."),
+		SPAN_ITALIC("You rear up, attempting to push \the [button] with your foreclaws."),
+		SPAN_WARNING("You hear something scratching and scrabbling."),
+		runemessage = CHAT_MESSAGE_DEFAULT_ACTION
+	)
+	if (!do_after(src, 5 SECONDS, button))
+		return ATTACK_FAILED
+	to_chat(src, SPAN_NOTICE("After some effort, you manage to push \the [button]."))
+	button.attack_hand(src)
+	return ATTACK_SUCCESSFUL
+
+
+/mob/living/simple_mob/animal/sif/grafadreka/trained/proc/InteractButtonAccess(obj/machinery/access_button/button)
+	var/datum/gender/gender = gender_datums[get_visible_gender()]
+	visible_message(
+		SPAN_ITALIC("\The [src] stands up awkwardly on [gender.his] hind legs and paws at \a [button]."),
+		SPAN_ITALIC("You rear up, attempting to push \the [button] with your foreclaws."),
+		SPAN_WARNING("You hear something scratching and scrabbling."),
+		runemessage = CHAT_MESSAGE_DEFAULT_ACTION
+	)
+	if (!do_after(src, 5 SECONDS, button))
+		return ATTACK_FAILED
+	to_chat(src, SPAN_NOTICE("After some effort, you manage to push \the [button]."))
+	button.attack_hand(src)
+	return ATTACK_SUCCESSFUL
+
+
+/mob/living/simple_mob/animal/sif/grafadreka/trained/proc/InteractFireAlarm(obj/machinery/firealarm/alarm)
+	var/datum/gender/gender = gender_datums[get_visible_gender()]
+	visible_message(
+		SPAN_ITALIC("\The [src] stands up awkwardly on [gender.his] hind legs and paws at \a [alarm]."),
+		SPAN_ITALIC("You rear up, attempting to push \the [alarm] with your foreclaws."),
+		SPAN_WARNING("You hear something scratching and scrabbling."),
+		runemessage = CHAT_MESSAGE_DEFAULT_ACTION
+	)
+	if (!do_after(src, 5 SECONDS, alarm))
+		return ATTACK_FAILED
+	to_chat(src, SPAN_NOTICE("After some effort, you manage to push \the [alarm]."))
+	alarm.attack_hand(src)
+	return ATTACK_SUCCESSFUL
+
+
+/mob/living/simple_mob/animal/sif/grafadreka/trained/proc/InteractConveyorSwitch(obj/machinery/conveyor_switch/lever)
+	visible_message(
+		SPAN_ITALIC("\The [src] pushes bodily against \a [lever]."),
+		SPAN_ITALIC("You press your shoulder into \the [lever], trying to change its direction."),
+		runemessage = CHAT_MESSAGE_DEFAULT_ACTION
+	)
+	if (!do_after(src, 2 SECONDS, lever))
+		return ATTACK_FAILED
+	to_chat(src, SPAN_NOTICE("After some effort, you manage to push \the [lever]."))
+	lever.attack_hand(src)
+	return ATTACK_SUCCESSFUL

code/modules/mob/mob.dm

@@ -83,7 +83,9 @@
 			exclude_mobs |= src
 		else
 			exclude_mobs = list(src)
-		src.show_message(self_message, 1, blind_message, 2)
+		show_message(self_message, 1, blind_message, 2)
+		if (runemessage)
+			create_chat_message(src, "[runemessage]", FALSE, list("emote"), audible = FALSE)
 	// Transfer messages about what we are doing to upstairs
 	if(shadow)
 		shadow.visible_message(message, self_message, blind_message, exclude_mobs, range)
@@ -1194,4 +1196,13 @@
 /mob/proc/handle_reagent_transfer(var/datum/reagents/holder, var/amount = 1, var/chem_type = CHEM_BLOOD, var/multiplier = 1, var/copy = 0)
 	var/datum/reagents/R = new /datum/reagents(amount)
 	. = holder.trans_to_holder(R, amount, multiplier, copy)
-	R.touch_mob(src)
+	R.touch_mob(src)
+
+
+/// Check the mob's dexterity var against a required level from MOB_DEXTERITY_*, optionally sending a message with optional target specificity.
+/mob/proc/check_dexterity(required_level, atom/target, silent)
+	if (dexterity < required_level)
+		if (!silent)
+			to_chat(src, SPAN_WARNING("You aren't dextrous enough to [target ? "use \the [target]" : "do that"]."))
+		return FALSE
+	return TRUE

code/modules/mob/mob_defines.dm

@@ -223,4 +223,7 @@
 	var/registered_z
 
 	var/in_enclosed_vehicle = 0	//For mechs and fighters ambiance. Can be used in other cases.
-	var/datum/focus //What receives our keyboard inputs. src by default
+	var/datum/focus //What receives our keyboard inputs. src by default
+
+	/// One of MOB_DEXTERITY_*, permitting various levels of machine and item interaction.
+	var/dexterity = MOB_DEXTERITY_NONE