Callstack Incubator

Pinpoints whether your app is slow because of JS thread blocking, bridge overhead, re-renders, or animations. Suggests the right fix: FlashList, native modules, Hermes tuning, or memory leak cleanup.

Scans a SKILL.md or skill repo against the official agentskills.io spec and Claude Code conventions, flagging syntax errors and best-practice gaps before publishing.

Steps through a version bump: applies template diffs, updates dependencies, migrates iOS and Android config, resolves CocoaPods and Gradle changes, flags breaking API shifts.

Systematically explores an iOS or Android app across screens and flows, documenting every crash, confusing UX, dead link, and edge case with steps to reproduce.

Handles stacked PRs, code review handoffs, and branch management via gh CLI. Routes you through the right merge strategy for your team's workflow without manual CLI fumbling.

Maps out incremental steps to add React Native screens to an existing iOS or Android app without rewriting the whole codebase, then handles the packaging and integration work.

Knows React Native Testing Library v13–14: how to render components, query elements, simulate user taps and gestures, and assert behavior — without test-implementation coupling.

Generates a GitHub Actions workflow that builds and tests your React Native app on iOS simulators and Android emulators, then downloads built artifacts automatically.

Tap, type, scroll, and screenshot across iOS, Android, macOS, and tvOS devices as if Claude were using the phone. Extract text from any screen element.

Guides component design, list rendering, animations, and native module integration for React Native and Expo. Catches common performance pitfalls before they ship.