Containment rate

Containment rate is the fraction of an injected fault a system holds at the boundary where it originates, before the error crosses into the next agent or step. It answers a narrower question than whether the run passed: the fraction of injected faults held to a single hop (the per-hop containment probability c), reported with a confidence interval.

Because a fault either clears the first hop or it does not, containment is a proportion, and a proportion needs an interval. The flagship profiler is designed to seed the same fault across many trials and report the contained share with a bootstrap 95% confidence interval, so the estimate carries its own uncertainty. Pre-launch, that is design intent: no containment figure is measured yet, so none is quoted here.

It mirrors blast radius, which supplies the population a fault could have reached, and it aggregates into cascade resistance once scored across a full topology map. Measure it before trusting any single pass rate; a containment number without its interval is a claim, not a result.