Design concept by Krishna Bhupathi. Aftercast is not a real product, and this incident is invented.
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Report
AC-0417
Occurred
2 Sep 2026, 02:14 UTC
Agent
Refund agent, v3
Operator
Name withheld
Run length
41 min 02 s
Status
Final report
This report replays the run from its Aftercast recording. Drag the playhead to see what the agent saw, what it did, and the moment it went wrong.
Drag the track, or focus it and use the arrow keys. Page Down jumps to the next finding.
Summary
What happened
For 41 minutes the agent refunded customers whose orders arrived damaged. When the payments service slowed down, one refund looked like it had failed. The agent tried again. It had already worked.
Every log line said 200 OK. It took a finance alert, not an engineering one, to stop it.
Findings
F1. The timeout hid a success
The payment went through. The tool stopped waiting at 8 s and told the agent it had failed.
F2. Retries had no idempotency key
Each retry was a brand-new refund, so the payments API had no way to know it was a repeat.
F3. Success was counted, not checked
The agent counted calls that returned 200. Nothing compared refunds paid with refunds owed.
Recommendations
Give every payment call an idempotency key, treat a timeout as “unknown” rather than “failed”, and compare refunds paid with refunds owed before the agent reports success.
Other reports
Aftercast is a design concept by Krishna Bhupathi. The product, the incidents and the people are fictional.
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