Unit Testing

Builds and manages iOS/macOS apps using xcodebuild and xcrun simctl CLI tools. Use when working with Xcode projects, running apps in simulators, managing simulator instances, taking screenshots, capturing logs, running tests, or automating builds.

Use when performing UI testing with Chrome DevTools MCP in a multi-agent worktree environment - ensures proper Chrome instance isolation to prevent cross-contamination between agents

Senior Frontend Code Reviewer with 12+ years JavaScript/TypeScript experience. Use when reviewing React/TypeScript code, checking code quality and style, verifying accessibility compliance, ensuring test coverage, or configuring linting tools (ESLint, Prettier).

TheGraph subgraph development with AssemblyScript handlers, schema definitions, and Matchstick testing. Triggers on subgraph, thegraph, graphql, mapping.ts.

Guide to designing and implementing tools for the vscode-copilot-chat extension, including patterns, testing, and best practices

Configure and use OpenTelemetry distributed tracing with Jaeger in HuleEdu services. Guides tracer initialization, span creation, W3C trace propagation, and correlation with logs/metrics. Integrates with Context7 for latest OpenTelemetry documentation.

Guide experienced developers through TDD failure scenarios and recovery procedures when tests behave unexpectedly

Go testing best practices including table-driven tests, race detection, test coverage, and mocking strategies. Use when writing or reviewing Go tests.

Principles for writing simple, maintainable Laravel/Livewire code. Use when writing Livewire components, tests, or Blade views. Focuses on avoiding over-engineering.

Systematic debugging workflow for CircleTel - analyzes errors, identifies root causes, proposes fixes, and validates solutions with tests

This skill should be used when users need to capture screenshots of web pages. It supports full-page screenshots, viewport-specific captures, responsive screenshots across multiple device sizes, and element-specific screenshots. Use this skill for visual testing, documentation, design reviews, or any task requiring automated browser screenshots.

Guide developers through mutation testing to assess and improve test suite quality

Use when creating new skills, editing existing skills, or verifying skills work before deployment - applies TDD to process documentation by testing with subagents before writing, iterating until bulletproof against rationalization

A skill with a name that might conflict. Use for testing conflict detection.

Use when implementing features or fixing bugs. Enforces Test-Driven Development (TDD) Red-Green-Refactor cycle. Supports Vitest, Jest, and similar frameworks.

Update existing pull request title and description based on latest changes.Use when user wants to refresh PR with latest commits. Triggers include:- Korean: "PR 업데이트해줘", "PR 수정해줘", "PR 다시 만들어줘"- English: "update PR", "refresh PR", "regenerate PR description"- Context: User has existing PR and wants to update title/description after adding more commits

System architecture: modules, project structure, ADRs, and testing. Use when designing or reviewing systems.

Reads MetaTrader 5 log files to validate indicator execution, unit tests, and compilation errors. Use when user mentions Experts pane, MT5 logs, errors, or asks "did it work". Triggers - check logs, did it work, Experts pane, Print output, runtime errors, debug output. (project)

KPI for measuring and improving code quality. Covers lint errors, type safety, test coverage, and verification pass rates. Use to ensure code meets quality standards.

Master xUnit testing patterns for ABP Framework applications including unit tests, integration tests, test data seeders, and mocking strategies. Use when: (1) writing xUnit tests for ABP services, (2) creating test data seeders, (3) implementing integration tests, (4) setting up test infrastructure.