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Re-running or inspecting a saved agent trace step by step to understand, debug, or reproduce behavior.
Trace replay lets you walk through the exact sequence of model calls, tool results, retrieval hits, retries, and approvals from a previous run. It is how a vague complaint becomes a reproducible bug: you can see where the context went wrong, swap a prompt, and compare the new run against the old one.
Plainly
Think of Trace Replay as the checklist that keeps the app open for real people. Re-running or inspecting a saved agent trace step by step to understand, debug, or reproduce behavior.
In practice
Use it when a change has to survive deploys, users, incidents, analytics, or billing reality. In practice, define the owner, input, output, and failure mode before you rely on it.