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A Trace You Cannot Replay Is Only a Log

This story is from 2026-09-14. It is preserved in the archive; the latest stories are on the live feed.

Most agent debugging loops are expensive in the worst possible way. You re-run the entire agent to see a bug a second time, paying model tokens, tool calls, and a fresh layer of nondeterminism for the privilege. A recorded trace tells you what happened once. It rarely tells you what will happen aft…

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  1. 2026-09-14 22:02 · DEV Community — AI
    A Trace You Cannot Replay Is Only a Log

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