network-diagnosis

name	network-diagnosis
description	Use when diagnosing DNS, TCP connectivity, ping reachability, network interfaces, service ports, or network-related SysGuard incidents.

Network Diagnosis

Use this skill to isolate whether an incident is caused by name resolution, interface state, TCP connectivity, or host reachability.

Runtime Invocation

The Go implementation is registered by RegisterCoreSkills and invoked as "network-diagnosis":

registry.Execute(ctx, "network-diagnosis", &skills.SkillInput{Params: map[string]interface{}{
	"operation": "tcp",
	"host": "example.com",
	"port": 443,
	"timeout": "5s",
}})

Supported operations are interfaces, dns, tcp, and ping.

Workflow

1. Start with interfaces for local network suspicion.
2. Use dns when hostnames fail or resolve unexpectedly.
3. Use tcp for service-port reachability.
4. Use ping only as a coarse reachability signal; ICMP can be blocked.

Safety

Do not run scanning or broad port sweeps from this skill. Diagnose only the host and port relevant to the incident.