Levels
Session kill (one user). Feature kill (agent feature). Global kill (all agents). Escalating.
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Trigger conditions
Incident response. Regulator order. Cost runaway. Bug requiring pause. Human decision.
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Implementation
Feature flag (LaunchDarkly) checked per invocation. Redis kill list checked. Circuit breaker pattern.
Testing
Regular kill-switch drills. Verify propagation time (should be seconds). Muscle memory in incident response.