Will the AI accept Interrogate?

Yes: it is accepted automatically.

Interaction · Hostile actions

Interrogate

No costAccepted automatically

Ask the recipient what they knows about the mysterious letter

What you need

You

Any courtier or guest: Has “achmach loyalty” (a variable the game's script sets)
Has “can interrogate var” (a variable the game's script sets)

The character you target

is_target_in_variable_list = { name = valid_to_interrogate_var target = scope:actor }

Interrogate is a hostile character interaction in Crusader Kings III. Accepted automatically. Patch 1.20.1.2, from game/common/character_interactions/09_mpo_interactions.txt.

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Quick answers (1)

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

Will they accept?

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

What happens

Effects

You may find out information about the mysterious letter
Event nomad_events.0006
The character you target: Will need to offer an explanation

Events it fires: nomad_events.0006

• 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) (12 lines of game script)

is_available = any_courtier_or_guest = {
	has_variable = achmach_loyalty
}
is_shown = scope:actor = {
	has_variable = can_interrogate_var
}
scope:recipient = {
	is_target_in_variable_list = {
		name = valid_to_interrogate_var
		target = scope:actor
	}
}

As written in game/common/character_interactions/09_mpo_interactions.txt.

Effects (on_send, on_accept, on_decline) (7 lines of game script)

on_accept = scope:actor = {
	custom_tooltip = interrogate_interaction_tt
	trigger_event = nomad_events.0006
}
scope:recipient = {
	custom_tooltip = interrogate_interaction_recipient_tt
}

As written in game/common/character_interactions/09_mpo_interactions.txt.

Category: Hostile actions
Again on the same character: after 10 years
In the menu: under More…
ID: interrogate_interaction

Source: game/common/character_interactions/09_mpo_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.