AI Agent Marked a Closed Form as Open by Trusting HTTP 200 Over Actual Content

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A developer discovered that their AI agent incorrectly flagged a submission form as active after relying solely on an HTTP 200 status code rather than inspecting the page's actual content. The agent had been tasked with scanning over 40 websites to check whether each accepted new submissions, and performed accurately on nearly all of them. However, on the one site the developer intended to use, the agent missed a clear in-page message stating the form was closed, and also overlooked an explicit 'isFormClosed: true' property in the underlying API response. The incident highlights a broader risk with AI agents that are mostly reliable — their occasional silent failures are harder to detect and potentially more dangerous than consistent underperformance. The developer concluded that surface-level signals like HTTP status codes cannot substitute for deep content inspection when building dependable automated workflows.

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