What breaks an AI agent after 50 clean demos
Article summary
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The demo ran 50 times without a failure. Then we shipped it. Three days into production, the agent started returning confident nonsense. Not errors. Not crashes. It finished its task, wrote a result, logged success. The result was wrong. Nobody caught it for six hours. The agent's job was to pull structured data from a third-party endpoint, summarize it, and route a decision. In testing, that endpoint always returned a list with at least one item. On day three, it returned an empty list. Valid…
1Key Takeaways
- The demo ran 50 times without a failure.
- Three days into production, the agent started returning confident nonsense.
- It finished its task, wrote a result, logged success.
- The agent's job was to pull structured data from a third-party endpoint, summarize it, and route a decision.
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3Why it matters
Coding AI shifts how fast software ships and how much human review each change needs. DEV — AI reports that the demo ran 50 times without a failure.
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