Test macOS Snapshots

Validate one macOS UI state at a time with an explicit expectation-first loop. Declare what the screenshot must prove before capture, then compare the image against that contract and fix the right layer.

Trigger boundary

Use this skill when you need to:

• validate a macOS window, sheet, or screen with screenshots
• choose or improve a deterministic snapshot automation path
• compare expected UI state against a captured image
• explain visual drift and decide whether the fix belongs in the app, the automation, or the expectation

Do not use this skill when:

• the main job is designing or building the UI rather than validating it
• the main job is driving a live browser; use run-playwright or run-agent-browser for browser control
• the task is diagnosing runtime internals with a debugger or devtools instead of checking known UI expectations