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Diff Every Tool Call: Replaying Agent Runs from a JSONL Trace

This story is from 2026-08-31. It is preserved in the archive; the latest stories are on the live feed.

Production failed on Friday. My final transcript looked clean. The agent answered, cited sources, and summarized. The raw trace told a different story. It called the same endpoint three times with stale arguments. Re-running the agent wasted tokens and time. Replaying the trace took seconds. I buil…

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  1. 2026-08-31 12:01 · DEV Community — AI
    Diff Every Tool Call: Replaying Agent Runs from a JSONL Trace

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