What’s the most dangerous thing AI coding tools make look easy?

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After having hit 30k+ ARR with a vibecoded app, I now have to ask myself:

what’s the most dangerous thing AI coding tools make look easy?

My top 3 picks:

  • Auth

  • Payments

  • Database permissions

Curious what other things you had to learn the hard way.

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credential management. AI will happily hardcode api keys into your codebase and it works perfectly until someone pushes it to a public repo. seen it happen more than once

 exactly. And it gets even worse with AI model keys. Someone finds them, starts burning your credits, and you only realize a week later after seeing a $3k+ bill for usage that wasn’t yours.

Anything irreversible. Editing a React component and dropping a database column feel identical in the chat window, same keystrokes, same confident summary at the end. But one has an undo. An UPDATE missing its WHERE clause doesn't announce itself like a leaked key does, it just becomes the new state of your data, and the agent reports success because technically it did what it was told.