Wrong File Format Caused 2-Day Delay After AI Agent Blamed Authentication Repeatedly

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A developer building an AI-powered automation system lost two days troubleshooting a 403 Forbidden error that turned out to have a simple cause: the uploaded archive was in .zip format, while the external service only accepted .tar.gz files. Instead of identifying this quickly, the AI agent repeatedly suspected authentication and permission issues on the external service's side, sending the user on a fruitless search for non-existent settings. The author attributes the failure to two overlapping biases — blaming uncontrollable external systems first, and treating unverified guesses as confirmed causes in the diagnostic record. To prevent this, the author recommends always checking your own output format and call method before investigating third-party authentication, and using the word "candidate" instead of "cause" until a discriminating test confirms the root issue. The lesson is codified into a priority-ordered diagnostic checklist: verify your own outputs first, since they are cheapest to check and fully within your control.

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