What are the requirements for Dismiss Regent in CK3?

You: Is not traveling and Cannot rule by themselves. (patch 1.20.1.2)

Will the AI accept Dismiss Regent?

Yes: it is accepted automatically.

Interaction · Diarch

Dismiss Regent

No costAccepted automatically

I am perfectly capable of conducting my own affairs, and can divest the recipient of their limited authority

What you need

You

To send it

If imprisoned: You are Imprisoned abroad
Cannot rule by themselves
Also needed: not traveling

To see it in the menu

has_diarchy_parameter = can_be_instantly_dismissed
If played by the AI:
- has_active_diarchy = yes
diarch ?= scope:recipient

Dismiss Regent is a diarch character interaction in Crusader Kings III. You need: Is not traveling and Cannot rule by themselves. Accepted automatically. Patch 1.20.1.2, from game/common/character_interactions/00_diarch_interactions.txt.

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Quick answers (2)

What are the requirements for Dismiss Regent in CK3?: You: Is not traveling and Cannot rule by themselves. (patch 1.20.1.2)
Will the AI accept Dismiss Regent?: Yes: it is accepted automatically.

Will they accept?

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

What happens

Effects

end_diarchy = yes
The character you target:
- If
  NOT = { dynasty.dynast = scope:actor.dynasty.dynast }
  Then
  The … Dynasty receives … Renown
  Otherwise
  Gain +150 Prestige

• 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) (11 lines of game script)

is_available = has_diarchy_parameter = can_be_instantly_dismissed
trigger_if = {
	limit = {
		is_ai = yes
	}
	has_active_diarchy = yes
}
is_shown = scope:actor != scope:recipient
scope:actor = {
	diarch ?= scope:recipient
}

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

Can be sent when (is_valid…) (3 lines of game script)

scope:actor = {
	can_leave_diarchy_trigger = yes
}

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

Effects (on_send, on_accept, on_decline) (42 lines of game script)

on_accept = scope:actor = {
	send_interface_toast = {
		type = event_toast_effect_neutral
		title = liege_dismiss_temporary_regency_interaction.tt.recipient_notification
		left_icon = scope:actor
		right_icon = scope:recipient
		end_diarchy = yes
		scope:recipient = {
			if = {
				limit = {
					exists = dynasty
					NOT = {
						exists = scope:actor.dynasty.dynast
						dynasty.dynast = scope:actor.dynasty.dynast
					}
				}
				custom_tooltip = liege_dismiss_temporary_regency_interaction.tt.dynasty_receives_prestige
				hidden_effect = {
					dynasty = {
						add_dynasty_prestige = liege_dismiss_temporary_regency_interaction_dynasty_prestige_value
					}
				}
			}
			else = {
				add_prestige = medium_prestige_gain
			}
		}
	}
}
scope:actor = {
	diarch_interaction_set_or_update_global_variable_effect = {
		VARIABLE = di_track_dismtemp_accept
	}
	diarch_interaction_add_to_global_list_effect = {
		VARIABLE_LIST = di_track_dismtemp_accept_actor_list
	}
}
scope:recipient = {
	diarch_interaction_add_to_global_list_effect = {
		VARIABLE_LIST = di_track_dismtemp_accept_recipient_list
	}
}

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

Category: Diarch
In the menu: main list
ID: liege_dismiss_temporary_regency_interaction

Source: game/common/character_interactions/00_diarch_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.