Connectivity Triage

Localize an active connectivity failure without changing network configuration. Collect the smallest useful evidence set, distinguish observations from inference, and stop when the fault domain is clear enough for the next safe action.

When to Use This Skill

Use this workflow when a macOS endpoint has an active symptom such as:

• an API, website, or MCP service timing out or disconnecting;
• DNS lookup failures or inconsistent name resolution;
• packet loss, latency, or unstable interactive traffic;
• an application that appears offline while other traffic works;
• uncertainty about whether the problem is local, upstream, or at the service.

This is a diagnostic workflow, not a remediation workflow. Do not change interface state, DNS settings, VPN/firewall configuration, or remote service state while establishing the fault domain.

Fast Decision Flow

Work from the symptom toward the narrowest discriminating check: