Kalshi trading bot rebuilt twice from its own prompt exposes repeat-order bugs

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A developer team rebuilt their Kalshi AI trading bot from its published prompt on two separate days, October 24 and October 27, 2026, testing it against live demo markets with a mock broker. The first pass uncovered three bugs, and the corrected prompt, rebuilt on October 27, revealed five more, none of which caused a crash. The problems involved the bot mishandling orders, limits, or retries, such as re-bidding on a ticker after its order had already filled. The team has since updated the prompt to address all eight issues. The write-up also describes how the bot's order flow and safeguards operate on Kalshi's demo environment, with no real orders sent.

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