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My tool-calling agent looked amazing in demos and then double-charged people

This story is from 2026-09-07. It is preserved in the archive; the latest stories are on the live feed.

I knew I was in trouble when the demo agent did exactly what I asked on Friday, then did it twice on Monday. Same prompt. Same API. Same nice-looking trace. But this time the second tool call hit a real downstream action and charged someone twice. That was the moment I stopped treating agents like…

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  1. 2026-09-07 13:53 · DEV Community — AI
    My tool-calling agent looked amazing in demos and then double-charged people

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