Execute

is_available = trigger_if = {
	limit = {
		is_ai = yes
	}
	is_at_war = no
}
is_shown = scope:recipient = {
	is_imprisoned_by = scope:puppet_or_actor
}

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

scope:recipient = {
	NOT = {
		has_strong_hook = scope:puppet_or_actor
	}
}
scope:recipient = {
	custom_description = {
		text = currently_being_tortured
		NOT = {
			has_character_flag = is_being_tortured
		}
	}
}
custom_tooltip = {
	text = struggle_parameter_struggle_cannot_execute_involved_prisoners
	NOT = {
		scope:puppet_or_actor = {
			any_character_struggle = {
				involvement = involved
				has_struggle_phase_parameter = struggle_cannot_execute_involved_prisoners
				is_secondary_character_involvement_involved_trigger = {
					CHAR = scope:recipient
				}
			}
		}
	}
}
custom_tooltip = {
	text = is_currently_being_purged_tt
	scope:recipient = {
		NOT = {
			has_character_flag = is_currently_being_purged
		}
	}
}
scope:recipient = {
	is_imprisoned_by = scope:puppet_or_actor
}

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

on_accept = scope:puppet_or_actor = {
	if = {
		limit = {
			OR = {
				AND = {
					has_diarchy_active_parameter = diarchy_is_co_rulership
					diarch ?= scope:recipient
				}
				AND = {
					scope:recipient = {
						has_diarchy_active_parameter = diarchy_is_co_rulership
					}
					is_diarch_of_target = scope:recipient
				}
			}
		}
		if = {
			limit = {
				liege_can_maim_co_ruler_without_killing_them_trigger = yes
			}
			custom_tooltip = execute_prisoner_interaction.tt.can_maim_diarch
		}
		if = {
			limit = {
				scope:puppet_or_actor.diarch = scope:recipient
			}
			end_diarchy = yes
			every_player = {
				limit = {
					NOR = {
						this = scope:puppet_or_actor
						this = scope:recipient
					}
					top_liege = scope:puppet_or_actor.top_liege
				}
				trigger_event = diarchy.8022
			}
		}
		else = {
			custom_description_no_bullet = {
				text = execute_prisoner_interaction_tt_co_emperor_usurpation
				object = scope:recipient
			}
			create_title_and_vassal_change = {
				type = usurped
				save_scope_as = change
			}
			scope:recipient = {
				every_held_title = {
					limit = {
						OR = {
							this = scope:recipient.capital_county
							this = scope:recipient.capital_county.duchy
							AND = {
								tier = tier_county
								this.duchy = scope:recipient.capital_county.duchy
							}
							tier >= scope:recipient.highest_held_title_tier
						}
					}
					change_title_holder = {
						holder = scope:puppet_or_actor
						change = scope:change
					}
				}
				every_vassal = {
					custom = custom.recipient_every_vassal
					change_liege = {
						LIEGE = scope:puppet_or_actor
						CHANGE = scope:change
					}
				}
				hidden_effect = {
					change_liege = {
						LIEGE = scope:puppet_or_actor
						CHANGE = scope:change
					}
				}
			}
			resolve_title_and_vassal_change = scope:change
			every_player = {
				limit = {
					NOR = {
						this = scope:puppet_or_actor
						this = scope:recipient
					}
					top_liege = scope:puppet_or_actor.top_liege
				}
				trigger_event = diarchy.8023
			}
		}
		save_scope_value_as = {
			name = suppress_legitimacy_from_crime
			value = yes
		}
	}
}
if = {
	limit = {
		scope:recipient = {
			is_imprisoned_by = scope:puppet_or_actor
		}
	}
	hidden_effect = {
		scope:puppet_or_actor = {
			humsacd_a_hof_effect = {
				SACRIFICER = scope:puppet_or_actor
				SACRIFICED_HOF = scope:recipient
			}
		}
	}
	if = {
		limit = {
			always = scope:execution_public
		}
		if = {
			limit = {
				scope:puppet_or_actor.capital_county = {
					NOT = {
						has_county_modifier = held_public_execution_modifier
					}
				}
			}
			custom_description_no_bullet = {
				subject = scope:puppet_or_actor
				text = public_execution_tooltip
			}
			scope:puppet_or_actor = {
				capital_county = {
					add_county_modifier = {
						modifier = held_public_execution_modifier
						days = 1850
					}
				}
				custom_tooltip = public_execution_control_effect
				hidden_effect = {
					every_held_title = {
						title_tier = county
						change_county_control = executioner_control_value
					}
				}
			}
		}
		else = {
			custom_description_no_bullet = {
				text = public_execution_too_soon_tooltip
			}
		}
	}
	if = {
		limit = {
			NOT = {
				always = scope:execution_devour
			}
			scope:puppet_or_actor = {
				has_relation_rival = scope:recipient
				has_personality_malicious_trigger = yes
				has_royal_court = yes
				has_dlc_feature = court_artifacts
			}
			scope:recipient = {
				is_adult = yes
			}
		}
		scope:puppet_or_actor = {
			random = {
				chance = {
					value = 25
					if = {
						limit = {
							has_relation_nemesis = scope:recipient
						}
						add = 75
					}
				}
				hidden_effect = {
					scope:recipient = {
						save_scope_as = skull_to_boil
					}
					trigger_event = {
						id = artifact.7000
						days = { 3 10 }
					}
				}
			}
		}
	}
	if = {
		limit = {
			NOT = {
				always = scope:execution_devour
			}
			scope:puppet_or_actor = {
				is_adult = no
				age >= 4
				is_ai = no
				NOT = {
					has_character_flag = witnessed_execution_flag
				}
			}
			scope:recipient = {
				is_adult = yes
			}
		}
		scope:puppet_or_actor = {
			trigger_event = bp1_yearly.9045
		}
	}
	else_if = {
		limit = {
			NOT = {
				always = scope:execution_devour
			}
			scope:puppet_or_actor = {
				OR = {
					has_relation_friend = scope:recipient
					has_relation_lover = scope:recipient
				}
				is_ai = no
			}
			scope:recipient = {
				is_adult = yes
			}
		}
		scope:puppet_or_actor = {
			trigger_event = bp1_yearly.9044
		}
	}
	scope:puppet_or_actor = {
		if = {
			limit = {
				has_government = landless_adventurer_government
				scope:recipient = {
					is_landless_adventurer = no
					is_ruler = yes
				}
			}
			if = {
				limit = {
					scope:recipient.highest_held_title_tier >= tier_empire
				}
				laamp_rewards_apply_criminal_xp_effect = {
					TRACK = marauder
					XP_MAX = gallowsbait_xp_massive_gain
					XP_MIN = gallowsbait_xp_massive_g
# … (cut here; the rest is in the file)

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