nest-shield

Set up @usex/nest-shield AI anomaly detection in a NestJS app — feed metrics to detectors (KNN, Isolation Forest, Z-Score, seasonal, threshold, composite) and act on detected anomalies. Use whenever the user wants to detect anomalies, outliers, spikes, or unusual traffic/metric patterns; flag suspicious behavior or attacks via ML; score metrics for abnormality; or configure/inject AnomalyDetectionService and its detectors — even if they don't name the library.

Add or fix @usex/nest-shield protection in a NestJS app — rate limiting, throttling, circuit breakers, overload/load-shedding, request priority. Use whenever the user wants to protect, rate-limit, throttle, debounce, or shield NestJS endpoints; handle traffic spikes, bursts, DDoS/abuse, or cascade failures; configure ShieldModule; apply @RateLimit/@Throttle/@CircuitBreaker/@Overload/@Shield decorators; or inject RateLimitService/CircuitBreakerService for programmatic limits — even if they don't name the library.

NestJS best practices and architecture patterns for building production-ready applications. This skill should be used when writing, reviewing, or refactoring NestJS code to ensure proper patterns for modules, dependency injection, security, and performance.