Will the AI accept Designate Sacrifice?

Yes: it is accepted automatically.

Interaction · Religious actions

Designate Sacrifice

No costAccepted automatically

Select the recipient as your personal Chief Sacrifice in the upcoming festival

What you need

The character you target

Is imprisoned by you
Does not have the Modifier: Soon to be Sacrificed

Designate Sacrifice is a religious character interaction in Crusader Kings III. Accepted automatically. Patch 1.20.1.2, from game/common/character_interactions/01_fp1_interactions.txt.

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Quick answers (1)

Will the AI accept Designate Sacrifice?: Yes: it is accepted automatically.

Will they accept?

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

What happens

Effects

The character you target:
- Gains the modifier “Soon to be Sacrificed”
- Opinion: Hatred (-50)
- Will be executed in three months
If
- You: Government is Clan
- The character you target: Government is Clan
- Your house is the target’s
- If
  You are not the target
  Then
  You are not the target
Then
- Your house:
  add_unity_value = { … }
Else if
- No
- You: Government is Clan
- Your house: Has you as house head
- One of these
  All of these
  exists = scope:recipient.house
  Your house is not the target’s
  or
  The character you target: Is Lowborn
Then
- Your house:
  add_unity_value = { … }

• 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) (9 lines of game script)

is_shown = scope:actor = {
	has_character_flag = gruesome_festivals_can_pick_human_sacrifice
}
scope:recipient = {
	is_imprisoned_by = scope:actor
	NOT = {
		has_character_modifier = gruesome_festivals_designated_sacrifice_fp1_modifier
	}
}

As written in game/common/character_interactions/01_fp1_interactions.txt.

Effects (on_send, on_accept, on_decline) (32 lines of game script)

on_accept = scope:actor = {
	hidden_effect = {
		every_prisoner = {
			limit = {
				has_character_modifier = gruesome_festivals_designated_sacrifice_fp1_modifier
			}
			save_scope_value_as = {
				name = removal_type
				value = flag:override
			}
			designate_gruesome_festivals_sacrifice_modifier_removed_effect = {
				DESIGNATOR = scope:actor
			}
		}
	}
}
scope:recipient = {
	send_interface_toast = {
		type = event_toast_effect_neutral
		title = designate_gruesome_festivals_sacrifice_interaction.recipient.notification.t
		left_icon = scope:actor
		designate_gruesome_festivals_sacrifice_interaction_effect = yes
		custom_tooltip = designate_gruesome_festivals_sacrifice_interaction.recipient.notification.tt
	}
}
add_clan_unity_interaction_effect = {
	CHARACTER = scope:actor
	TARGET = scope:recipient
	VALUE = medium_unity_loss
	DESC = clan_unity_human_sacrifice.desc
	REVERSE_NON_HOUSE_TARGET = no
}

As written in game/common/character_interactions/01_fp1_interactions.txt.

Category: Religious actions
In the menu: under More…
ID: designate_gruesome_festivals_sacrifice_interaction

Source: game/common/character_interactions/01_fp1_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.