I built an AI trading agent, then built one that doesn't use AI to trade
murdocc007 · reddit · 2026-09-28
The author found LLM-interpreted trading strategies unstable — the model re-interprets "strong momentum" differently every run, making backtesting unreliable. They evolved three architectures: an LLM agent deciding every run, a rules agent where the LLM only translates plain English into explicit, backtestable rules executed deterministically, and a brokerage agent trading via Robinhood. Key takeaway: the LLM's real value may be translating human intent into explicit, testable, executable logic rather than making the trading decision itself.
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