Run protocol and run workflow for a chaos experiment that has already been designed: the four pre-flight gates (non-production target, measured healthy baseline, live observability, a rollback that has actually been exercised), how to pick a conservative blast-radius bound, the sampling cadence and abort criteria fixed in writing before injection, the per-runner inject and abort commands (Chaos Mesh / Litmus / Gremlin / Toxiproxy), the refuse-to-start rules (no blast-radius bound, production context, degraded baseline, offline observability, unexercised rollback), and the recovery-validation step with its tolerance and timeout. Owns execution safety only, not experiment design: the steady-state hypothesis, the fault to inject, and the experiment file come from chaos-experiment-author. Use when an experiment definition exists and a fault is about to be injected into a running system, and the go/no-go gates, abort thresholds, and recovery check still need to be agreed and written down before the fault starts.