What problem does it solve? Setting up Google Cloud and Firebase credentials is a common blocker before any workflow that creates Firebase projects or GA4 properties. This Skill walks through installing and authenticating both CLIs on macOS, Linux, and Windows so subsequent Firebase and Google Analytics steps work without manual credential debugging. ## Core Features & Use Cases - Cross-platform installation: Detects the operating system and installs the Google Cloud SDK via Homebrew, apt, snap, or winget, plus the Firebase CLI via npm. - Browser-based authentication: Runs gcloud auth login and firebase login, with headless fallbacks like firebase login --no-localhost for SSH sessions. - Re-authentication handling: Recovers from expired credentials using gcloud auth login and firebase login --reauth, then verifies with gcloud auth list and firebase projects:list. - Use Case: Before running a site-creation workflow that provisions a Firebase project and GA4 property, run this once per machine to ensure both CLIs are installed and signed in with the correct Google account. ## Quick Start Authenticate my machine with gcloud and the Firebase CLI so I can create Firebase projects and GA4 properties.