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I shipped a small prompt tweak, and now some answers are subtly worse and nobody can say why.
What you'll have at the end
The previous prompt version live again within minutes, with a diff of exactly what changed
You need
An LLM feature already live in production whose prompt just changed, with the exact wording of the previous, working version still recoverable somewhere: a version-control history, a saved config, or a prompt tool's history.
Not covered
Building the automated test suite that blocks a bad prompt edit before it ever merges; this covers diagnosing and reversing one that's already live.
See your LLM's cost, latency, and errors on one dashboard
Use this first if you don't yet have a way to notice a quality regression before a user reports it.
Wire a regression check that runs before every prompt edit ships
Go here once you want to stop a bad edit from reaching production at all, instead of recovering from one that already has.
Checked 15 Aug 2026
Part of the LLMOps cookbook