Backtesting Red Flags

A free AI agent skill that teaches your agent to audit any backtest result for the eight most common errors in quantitative finance. Most agents run backtests. Few know how to question them. This skill gives your agent the exact checklist used in production quant research: from look-ahead bias in data filling, to log-versus-simple return confusion that compounds silently over years, to overfitting that only shows up when real money is on the line. Each red flag includes the diagnostic question, what bad output looks like, and the fix. Works on any asset class — equities, ETFs, crypto, futures.