design-verify-ios

To verify iOS simulator screenshots match mockups, this skill captures the simulator state via xcodebuildmcp and compares it against stored baseline pngs using design-comparison diffs to detect visual drift.

iOS UI drift detection identifies visual discrepancies between implemented screens and approved mockups. Screenshot diffing captures the current simulator screen and compares pixel layouts, colors, and typography against baseline images to classify severity.

To capture an iOS simulator screenshot for mockup verification, the skill acquires a shared simulator lock, boots the Xcode app, optionally navigates to the desired screen, and captures the implementation screenshot for baseline comparison.

Design-verify-ios does not work without approved mockup baselines. The baseline discovery process locates the latest mockup pngs for the requested screen and halts the workflow if none exist, ensuring you generate a baseline first.

You can run screenshot comparison tests for Xcode apps before QA by capturing the simulator screen and comparing it to approved mockup baselines, producing actionable discrepancy summaries with suggested fixes before shipping.

iOS simulator screenshot capture fails during design verification if the shared simulator lock cannot be acquired or if XcodeBuildMCP fails to boot the app, preventing the capture and comparison of the implementation screen.