Will the AI accept Foster Legitimacy (Scheme)?

Yes: it is accepted automatically.

Interaction · Vassal actions

Foster Legitimacy (Scheme)

No costAccepted automatically

Attempt to increase the recipient's Legitimacy and Opinion of you

What you need

You

To send it

can_start_scheme = { type = foster_legitimacy_scheme target_character = scope:recipient }

To see it in the menu

you has administrative government mechanic
Is an Adult
If played by the AI: Is a Governor
Is not imprisoned
The target is not you
If played by the AI:
- Opinion of recipient more than 0
- The character you target:
  - NOT = { meets_legitimacy_expectation_of = scope:actor }

The character you target

Has Legitimacy
Is an Adult
they has administrative government mechanic
Their government is not Celestial

Foster Legitimacy (Scheme) is a vassal character interaction in Crusader Kings III. Accepted automatically. Patch 1.20.1.2, from game/common/character_interactions/06_ep3_scheme_interactions.txt.

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Quick answers (1)

Will the AI accept Foster Legitimacy (Scheme)?: Yes: it is accepted automatically.

Will they accept?

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

What happens

Effects

Start the Foster Legitimacy scheme against the target
If
- You: Has the Trait: Virtuoso Arbitrator
Then
- The new scheme:
  add_scheme_progress = { value = scheme_progress_gain multiply = 3 }
The new scheme:
- If
  scope:actor = scope:actor.top_liege
  Then
  add_scheme_modifier = { type = admin_emperor_scheme_modifier }
  Else if
  Your house:
  is_dominant_family = yes
  Then
  add_scheme_modifier = { type = admin_dominant_family_scheme_modifier }
  Else if
  Your house:
  is_powerful_family = yes
  Then
  add_scheme_modifier = { type = admin_powerful_family_scheme_modifier }
If successful, may gain a Favor Hook on …
If unsuccessful, spends 75 Prestige
The character you target: If successful, increases Legitimacy by 100

• 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) (35 lines of game script)

is_available = government_has_mechanic = administrative
is_adult = yes
trigger_if = {
	limit = {
		is_ai = yes
	}
	is_governor = yes
}
is_imprisoned = no
is_shown = scope:recipient != scope:actor
scope:recipient = {
	this = scope:actor.liege
	has_legitimacy = yes
	is_adult = yes
	government_has_mechanic = administrative
	NOT = {
		government_has_flag = government_is_celestial
	}
}
scope:actor = {
	trigger_if = {
		limit = {
			is_ai = yes
		}
		opinion = {
			target = scope:recipient
			value > 0
		}
		scope:recipient = {
			NOT = {
				meets_legitimacy_expectation_of = scope:actor
			}
		}
	}
}

As written in game/common/character_interactions/06_ep3_scheme_interactions.txt.

Can be sent when (is_valid…) (6 lines of game script)

scope:actor = {
	can_start_scheme = {
		type = foster_legitimacy_scheme
		target_character = scope:recipient
	}
}

As written in game/common/character_interactions/06_ep3_scheme_interactions.txt.

Effects (on_send, on_accept, on_decline) (22 lines of game script)

on_accept = scope:actor = {
	send_interface_toast = {
		type = event_toast_effect_neutral
		title = start_foster_legitimacy_notification
		left_icon = scope:actor
		right_icon = scope:recipient
		begin_scheme_basic_effect = {
			SCHEME_TYPE = foster_legitimacy_scheme
			TARGET_TYPE = target_character
			TARGET_SCOPE = scope:recipient
		}
	}
	education_5_scheme_progress_effect = {
		SKILL = diplomacy
	}
	ep3_actor_scheme_modifier_effect = yes
	custom_tooltip = foster_legitimacy_positive_outcome_actor_tt
	custom_tooltip = foster_legitimacy_negative_outcome_tt
}
scope:recipient = {
	custom_tooltip = foster_legitimacy_positive_outcome_recipient_tt
}

As written in game/common/character_interactions/06_ep3_scheme_interactions.txt.

Category: Vassal actions
Starts the scheme: Foster Legitimacy
In the menu: under More…
ID: start_foster_legitimacy_interaction

Source: game/common/character_interactions/06_ep3_scheme_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.