Will the AI accept Demand Subjugation?

Yes: it is accepted automatically.

Interaction · Hostile actions

Demand Subjugation

No costAccepted automatically

Demand that the recipient becomes your Vassal, under threat of War

What you need

You

To send it

One of these
- The character you target: Highest held Title is at most Kingdom Rank
- or
  You:
  - is_target_in_variable_list = { name = subjugation_offer_under_consideration target = scope:recipient }

To see it in the menu

Highest held Title is at least Empire Rank
Any owned story:
Is an Independent Ruler

The character you target

Their government is not Adventurer
Is an Independent Ruler
Any neighboring top liege realm owner:

Demand Subjugation is a hostile character interaction in Crusader Kings III. Accepted automatically. Patch 1.20.1.2, from game/common/character_interactions/00_mongol_interactions.txt.

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Quick answers (1)

Will the AI accept Demand Subjugation?: Yes: it is accepted automatically.

Will they accept?

The other character has no choice: the game accepts it automatically.

What happens

Effects

… gets a chance to respond

Events it fires: mongol_invasion.2001, mongol_invasion.2111, mongol_invasion.2101

• the game's own tooltip text · ◦ our reading of the script line · code the script where neither exists

Who can use it and sees it (is_available, is_shown) (13 lines of game script)

is_available = highest_held_title_tier >= tier_empire
any_owned_story = {
	type = story_mongol_invasion
}
top_liege ?= this
is_shown = scope:recipient = {
	this != scope:actor
	is_landless_adventurer = no
	top_liege ?= this
	any_neighboring_top_liege_realm_owner = {
		this = scope:actor
	}
}

As written in game/common/character_interactions/00_mongol_interactions.txt.

Can be sent when (is_valid…) (11 lines of game script)

OR = {
	scope:recipient = {
		highest_held_title_tier <= tier_kingdom
	}
	scope:actor = {
		is_target_in_variable_list = {
			name = subjugation_offer_under_consideration
			target = scope:recipient
		}
	}
}

As written in game/common/character_interactions/00_mongol_interactions.txt.

Effects (on_send, on_accept, on_decline) (9 lines of game script)

on_accept = custom_tooltip = mongol_demand_subjugation_interaction_tooltip
hidden_effect = {
	scope:actor = {
		save_scope_as = mongol_emperor
	}
	scope:recipient = {
		send_mongol_subjugation_demand_effect = yes
	}
}

As written in game/common/character_interactions/00_mongol_interactions.txt.

Category: Hostile actions
In the menu: under More…
ID: mongol_demand_subjugation_interaction

Source: game/common/character_interactions/00_mongol_interactions.txt and the English localisation, Crusader Kings III 1.20.1.2. “You” is the character who sends it (scope:actor, or a puppet acting for you); “the character you target” is the recipient.