A blown-up bot makes for a good horror story, and the moral is always the same. It wasn't the signal that did the damage — it was the absence of everything that's supposed to sit around the signal.

No position limits

The classic blow-up: a bot with no hard cap on size or exposure keeps adding, or sizes one trade far too big, and a single bad move erases the account (risk of ruin). A signal being occasionally wrong is survivable; being wrong while grotesquely oversized is not (position sizing).

No stops, no fail-safes

A bot with no hard stop will happily hold a loser to zero. Worse, a bot with no fail-safes keeps trading on a stale data feed, a disconnected broker, or its own bug — executing garbage at full speed with no human noticing until the damage is done (kill switches and fail-safes). Software fails in ways a human at the screen would catch.

A good signal with no risk layer is a loaded gun with no safety. It works fine right up until the one time it doesn't.

Blind over-trust

The human error behind most blow-ups is "set and forget" — trusting a bot so completely that nobody watches until a bad day (automation isn't passive income). The fix is architectural: hard position limits, a real stop on every trade, sane behavior when data goes bad, a kill switch, and an operator who still pays attention. That risk layer — not the entry — is what separates a tool from a liability (a real automated system).