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Use libtower for network health checks in Go covering TCP, TLS, HTTP, HTTPS, DNS, ICMP ping, WebSocket, and certificate expiry. Trigger whenever the user needs to: monitor a service, probe an endpoint, check if a port is open, resolve DNS, measure latency, verify SSL certificates, write a readiness/liveness probe, do synthetic monitoring, or build a health-check function in Go. Reach for this skill even if libtower isn't named — "is X reachable?", "is port Y open?", "health check service Z", "uptime monitor", "readiness probe", "ping from Go", "check SSL expiry", "DNS health check", "websocket health check" all signal this skill. Also use when composing multiple checks or needing the Checker interface pattern.