Signals
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Most fragile bots fail because one component was designed in isolation from the others.
Trend-following, pullback continuation, breakout confirmation, and reversion all require different expectations about holding time and failure rate.
A precise entry with a vague exit is still vague. The path out of the trade must be just as specific as the reason to enter it.
A sound signal can become a bad system if the position sizing creates unacceptable volatility, concentration, or correlated risk across bots.
A crossover rule buys when a fast average rises above a slow one and sells when it drops below. Move the fast length and watch the signals — and the whipsaws — change.
Do not optimize entries before defining exits.