# Crosscheck

> Type-check shared packages against the iOS and watchOS SDKs. Use after editing core packages, before verify, or when CI crosscheck fails.

- Skill: `hoangsonww/crosscheck` (Agent Skill)
- Install (CLI): `npx skillmds@latest add hoangsonww/crosscheck`
- Raw SKILL.md: https://api.skillmd.com/api/skills/hoangsonww/crosscheck/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Coding & Dev Tools
- Author: hoangsonww (https://skillmd.com/u/hoangsonww)
- Updated: 2026-09-17
- Page: https://skillmd.com/skills/hoangsonww/crosscheck

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# Cross-check

Core packages must compile for iOS and watchOS even when you developed on macOS.

```bash
./Scripts/crosscheck.sh ios
./Scripts/crosscheck.sh watchos
```

Failures usually mean an AppKit/UIKit import leaked into `Packages/Diffuse*` core, or an API that does not exist on that SDK.

Do not skip this to land a Mac-only type in Core. Put it in the app target or `DiffuseCollectors` behind the right registry.