# Does a behavior drift baseline go stale if an agent goes quiet?

No. A baseline that's stopped seeing traffic doesn't age out on its own; silence isn't evidence the baseline is wrong, so Tessary keeps scoring against it rather than discarding it out of caution.

What actually makes a baseline stale is new activity that looks nothing like what it was fitted on, not the passage of time. A call site can sit idle for a while and pick back up exactly where it left off with no findings, because nothing about its behavior changed, it just paused. If it comes back doing something genuinely different, that shows up as drift the same way it would from a call site that never stopped, judged against the baseline it already had rather than treated as a break caused by the gap itself.

The one thing idleness does change is how much you can trust a brand-new baseline that never saw enough traffic to establish what normal looks like in the first place.

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Source: https://tessary.ai/answers/tessary-behavior-drift/does-a-behavior-drift-baseline-go-stale-when-idle
More on Tessary behavior drift: https://tessary.ai/answers/tessary-behavior-drift
From Tessary, agent reliability for AI agents in production: https://tessary.ai