AI-Native Debugging: Traces, Prompt Diffs, and Reproducing the Unreproducible

LLM bugs do not appear in stack traces. A model returning a confident wrong answer triggers no exception, fails no schema check (if the answer is plausibly shaped), and looks fine in metrics. Without the right trace and replay tooling, debugging a quality regression is guesswork — engineers retrain, change models, rewrite prompts, hope. Engineers with proper trace + replay infrastructure isolate the failed component in minutes and ship a targeted fix.

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