Negotiate Release

is_shown = exists = scope:puppet_or_actor
scope:puppet_or_actor ?= {
	trigger_if = {
		limit = {
			is_ai = yes
			NOT = {
				puppeteer ?= {
					is_ai = no
				}
			}
		}
		has_prisoners = yes
	}
}
scope:recipient = {
	is_imprisoned_by = scope:puppet_or_actor
}

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

scope:recipient = {
	custom_description = {
		text = currently_being_tortured
		NOT = {
			has_character_flag = is_being_tortured
		}
	}
}
cannot_release_former_regent_whilst_old_regent_holds_power_trigger = {
	PRISONER = scope:recipient
	REGENT = scope:recipient.var:imprisoned_by_diarch
}
custom_tooltip = {
	text = is_currently_being_purged_tt
	scope:recipient = {
		NOT = {
			has_character_flag = is_currently_being_purged
		}
	}
}

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

on_accept = if = {
	limit = {
		scope:recipient = {
			has_character_modifier = allowed_to_go_outside
		}
	}
	scope:recipient = {
		remove_character_modifier = allowed_to_go_outside
	}
}
if = {
	limit = {
		scope:recipient = {
			has_character_modifier = moldy_gruel_diet
		}
	}
	scope:recipient = {
		remove_character_modifier = moldy_gruel_diet
	}
}
if = {
	limit = {
		scope:recipient = {
			is_imprisoned_by = scope:puppet_or_actor
		}
	}
	scope:recipient = {
		if = {
			limit = {
				is_imprisoned = yes
				scope:disfigure = no
				scope:blind = no
				scope:castrate = no
			}
			release_from_prison = yes
		}
		if = {
			limit = {
				scope:demand_conversion = yes
			}
			demand_conversion_interaction_effect = yes
			add_opinion = {
				modifier = demanded_my_conversion_opinion
				target = scope:puppet_or_actor
			}
			if = {
				limit = {
					scope:puppet_or_actor = {
						any_character_struggle = {
							involvement = involved
							activate_struggle_catalyst_secondary_character_involvement_involved_trigger = {
								CATALYST = catalyst_demanding_important_conversion
								CHAR = scope:recipient
							}
						}
					}
				}
				scope:puppet_or_actor = {
					every_character_struggle = {
						involvement = involved
						limit = {
							activate_struggle_catalyst_secondary_character_involvement_involved_trigger = {
								CATALYST = catalyst_demanding_important_conversion
								CHAR = scope:recipient
							}
						}
						activate_struggle_catalyst = {
							catalyst = catalyst_demanding_important_conversion
							character = scope:puppet_or_actor
						}
					}
				}
			}
		}
		if = {
			limit = {
				scope:banish = yes
				scope:recipient = {
					is_landed_or_landless_administrative_or_theocratic = yes
				}
			}
			banish_effect = {
				BANISHER = scope:puppet_or_actor
			}
			if = {
				limit = {
					NOT = {
						scope:puppet_or_actor = {
							has_banish_reason = scope:recipient
						}
					}
				}
				scope:puppet_or_actor = {
					add_tyranny = banishment_tyranny_gain
				}
			}
			add_opinion = {
				modifier = banished_me
				target = scope:puppet_or_actor
			}
		}
		else_if = {
			limit = {
				AND = {
					scope:banish = yes
					scope:recipient = {
						is_landless_adventurer = no
						is_pool_character = no
					}
				}
			}
			if = {
				limit = {
					this.gold > 0
					has_none_of_variables = {
						name = realm_priest
						name = was_bookmaker
					}
				}
				pay_short_term_gold = {
					target = scope:puppet_or_actor
					gold = this.gold
				}
			}
			if = {
				limit = {
					has_any_artifact = yes
				}
				every_character_artifact = {
					limit = {
						NOT = {
							has_variable = artifact_prevent_transfer
						}
					}
					set_owner = {
						target = scope:puppet_or_actor
						history = {
							location = scope:recipient.location
							actor = scope:recipient
							recipient = scope:puppet_or_actor
							type = stolen
						}
					}
					scope:puppet_or_actor = {
						if = {
							limit = {
								NOT = {
									has_variable = stolen_artifact
								}
							}
							set_variable = {
								name = stolen_artifact
								value = 1
							}
						}
						else = {
							change_variable = {
								name = stolen_artifact
								add = 1
							}
						}
					}
				}
			}
			banish = yes
			add_opinion = {
				modifier = banished_me
				target = scope:puppet_or_actor
			}
		}
		else_if = {
			limit = {
				AND = {
					scope:banish = yes
					scope:recipient = {
						is_playable_character = no
						is_pool_character = yes
					}
				}
			}
			if = {
				limit = {
					this.gold > 0
				}
				pay_short_term_gold = {
					target = scope:puppet_or_actor
					gold = this.gold
				}
			}
			add_opinion = {
				modifier = banished_me
				target = scope:puppet_or_actor
			}
		}
		if = {
			limit = {
				scope:recruit = yes
			}
			if = {
				limit = {
					scope:puppet_or_actor = {
						culture = {
							has_cultural_parameter = can_recruit_prisoners_easily
						}
					}
				}
				add_opinion = {
					modifier = loyal_servant
					target = scope:puppet_or_actor
				}
				scope:puppet_or_actor = {
					if = {
						limit = {
							can_add_hook = {
								target = scope:recipient
								type = loyalty_hook
							}
						}
						add_hook = {
							type = loyalty_hook
							target = scope:recipient
						}
					}
				}
			}
			else = {
				add_opinion = {
					modifier = demanded_recruitment
					target = scope:puppet_or_actor
				}
			}
			scope:puppet_or_actor = {
				if = {
					limit = {
						AND = {
							scope:puppet_or_actor.rite = {
								rite_has_tenet = tenet_communal_possessions
							}
							scope:recipient = {
								has_trait = peasant_leader
							}
						}
					}
					scope:puppet_or_actor = {
						add_piety = medium_piety_gain
					}
				}
			}
			scope:puppet_or_actor = {
				add_courtier = scope:recipient
			}
		}
		if = {
			limit = {
				scope:renounce_claims = yes
			}
			add_opinion = {
				modifier = demand
# … (cut here; the rest is in the file)

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