A support agent went wrong, and the team could not reconstruct the prompt weeks later
larabyeol · reddit · 2026-07-24
A team lost the ability to reconstruct why a support agent gave a wrong answer weeks later.
- They had the customer screenshot, timestamp, and output log.
- They did not have the exact prompt version that produced it.
- The system prompt had been edited in config files by two people, buried inside unrelated commits.
- A model version bump happened around the same time, making attribution even harder.
The takeaway: production agent systems need prompt versioning, model pinning, and change tracking that makes incident forensics possible.
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