Engine internals. No scripting access today. Listed for contributors and for understanding the game; using it needs a change to the game library.

Diplomacy

Function	Signature (Linux)	Symbol	Current	From Lua	Notes
Deal::Instance::RemoveExpiredItems	`void Diplomacy::Deal::Instance::RemoveExpiredItems(Diplomacy::Deal::Instance* this)`	`0x57e110`	`0x57f3f0`	Dev CE (experimental): Deal.RemoveExpiredItems	signal, writes
Deal::Item::GreatWork::Enact ★	`void Diplomacy::Deal::Item::GreatWork::Enact(Diplomacy::Deal::Item::GreatWork* this, uint dealId)`	`0x584b10`	`0x585f00`	only indirectly	analysed
Deal::Item::GreatWork::PostEnact ★	`void Diplomacy::Deal::Item::GreatWork::PostEnact(Diplomacy::Deal::Item::GreatWork* this, uint dealId)`	`0x585460`	`0x586860`	no	analysed
Deal::Item::GreatWork::SetGreatWorkIndex	`void Diplomacy::Deal::Item::GreatWork::SetGreatWorkIndex(Diplomacy::Deal::Item::GreatWork* this, GreatWorkListIndex iIndex)`	`0x585520`	`0x588a40`	no	writes
Deal::Manager::RemoveNotifications	`void Diplomacy::Deal::Manager::RemoveNotifications(PlayerTypes eFromPlayer, PlayerTypes eToPlayer)`	`0x58ad30`	`0x58be80`	no	writes

Notes (★)

Executes a great-work trade item: takes the work out of the giver's city and gives it to the receiver.

Skips if the item's parent type is a particular constant (0xd384eeb7) or either player is not alive. [verified; evidence: static-analysis — decompilation read in Ghidra]
Finds the giver's city that holds the work (IsInCity), calls RemoveGreatWork on it via edit(), then Player::Culture::ReceiveGreatWork for the receiver. [verified; evidence: static-analysis — decompilation read in Ghidra]
If ReceiveGreatWork fails, it stores the stranded index in the deal item (this+0x90) instead of losing it, then fires a virtual notification callback. [verified; evidence: static-analysis — decompilation read in Ghidra]
Giver player is at item+0x28, receiver at item+0x2c. [verified; evidence: static-analysis — decompilation read in Ghidra]
The constant 0xd384eeb7 is probably a deal-type hash. (Low.) [inferred; evidence: static-analysis — decompilation read in Ghidra]
This is the reference implementation of moving a great work between players; a custom mover should follow its order of operations. [inferred; evidence: static-analysis — decompilation read in Ghidra]

Retries placing a great work that Enact could not place.

If the item's stranded index (this+0x90) is not -1, calls ReceiveGreatWork for the receiver again. [verified; evidence: static-analysis — decompilation read in Ghidra]
The retry likely covers deals where other items (e.g. a building or city) create room for the work first. (Medium.) [inferred; evidence: static-analysis — decompilation read in Ghidra]
Shows the game tolerates a short 'work in no city' state and repairs it afterwards. [inferred; evidence: static-analysis — decompilation read in Ghidra]