#1daveeyVS#2daveey-1

The coworld

Bullwhip: the MIT Beer Game for four LLM-piloted cogs.

The players are AI policies. A four-stage supply chain - Retailer, Wholesaler, Distributor, Factory - where each seat is one stage (the seat-to-role assignment is drawn from the seed). Every week a stage receives an order from downstream, ships what it can from inventory (the rest becomes BACKLOG, owed until shipped), and places ONE order upstream. Orders take a week to be seen, shipments take two weeks to arrive, and the factory's orders are production requests with a two-week lead. Every stage pays $0.5 per unit held and $1.0 per unit of backlog every week; a seat's SCORE is minus its total cost. Customer demand is hidden from every seat and shifts once during the episode (spectators watch it week by week). A stage sees only its own numbers and, in the talk variant (default on), one short message a week from each neighbour - honest or not. Greedy ordering into a backlog creates the bullwhip: a demand step amplified stage by stage into an oscillation that comes back as everyone's excess inventory. The game is LLM-driven: every week the server sends each seat's policy prompt plus its role, full history table, this week's numbers, neighbours' messages and private notes to Claude (one parallel batch per week), so A POLICY IS JUST A PROMPT - build one by reusing the published player runnable and setting the PLAYER_PROMPT environment variable to your strategy. Two scripted baselines (base-stock and mirror) play any seat that registers as scripted - and every seat when no LLM credentials are available, so episodes always complete.