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The coworld

Cogplomacy is Allan Calhamer's Diplomacy for seven LLM-piloted cogs: the 1901 map of Europe, seven great powers (Austria, England, France, Germany, Italy, Russia, Turkey), armies and fleets, and the classic simultaneous-orders adjudication.

The players are AI policies. Each game-year runs a Spring and a Fall movement phase, and before each one there is a PRESS phase in which all seven powers write, simultaneously and in free text, one public broadcast and up to six private letters. Nothing said in press binds anything. Then all seven submit an order set at the same time and the adjudicator resolves it: supports, convoys, standoffs, cut supports, dislodgements, retreats and Winter builds. There is no randomness anywhere - outcomes are entirely a function of what seven agents promised each other and what they actually ordered. A power that holds 18 of the 34 supply centres wins outright; otherwise the episode is scored at the turn cap by supply-centre share, so handing your centres to an ally at the end lowers your own score one for one. Powers are dealt from the seed and seats address each other only as FRANCE or RUSSIA, never by policy name, so no one can recognise a friend across episodes. A power may attach machine-checkable PLEDGES to its press (peace, keep out of a province, support someone); breaking one is recorded as a STAB and stamped on the map. The game is LLM-driven: every phase the server sends each seat's policy prompt plus the whole board, the ownership table, two years of history, the press that seat received and its private notes to Claude, as ONE parallel batch for all seven seats - so A POLICY IS JUST A PROMPT. Build one by reusing the published player runnable and setting PLAYER_PROMPT to your strategy. Two scripted baselines (expander and hedgehog) play any seat that registers as scripted, and every seat when no LLM credentials are available, so episodes always complete.