Testing

A Python development guide that teaches best practices for type hints, testing with pytest, linting with ruff, and strict type checking with mypy. Includes project structure recommendations, CI/CD configurations, pre-commit hooks, and design patterns like dependency injection and the Result pattern.

This skill provides comprehensive guidance for end-to-end testing with Playwright. It covers Page Object Model patterns, authentication handling, cross-browser testing, network mocking, visual testing, and CI/CD integration with GitHub Actions.

A comprehensive guide for building AI-first applications using LLMs. Covers project structure, typed LLM client patterns, prompt versioning, testing strategies (mocks, fixtures, evaluations), CI/CD integration for LLM tests, and cost/performance tracking. Focuses on the principle of using LLMs for logic and traditional code for infrastructure.

This skill provides structured templates and best practices for iterative test-driven development using the Ralph Wiggum loop plugin. It guides Claude through self-referential development cycles where the AI iterates on code until tests pass, with clear completion criteria and error classification to distinguish between fixable code issues and environment blockers.

A comprehensive Flutter development guide covering Riverpod state management, Freezed data models, go_router navigation, and mocktail testing. Provides project structure templates, code patterns, CI/CD configuration, and common anti-patterns to avoid.

Provides comprehensive Android Java development guidance covering MVVM architecture, ViewBinding patterns, Activity/Fragment lifecycle management, unit testing with Mockito, instrumentation testing with Espresso, and GitHub Actions CI/CD configuration. Includes best practices for avoiding common Android anti-patterns like memory leaks and context leaks.

This skill should be used when user asks about "Playwright", "responsiveness test", "test with playwright", "test login flow", "file upload test", "handle authentication in tests", or "fix flaky tests".

Safe Refactoring provides a structured methodology for improving code quality without changing functionality. It includes a code smells catalog, refactoring patterns reference, and enforces behavior preservation through mandatory test validation before and after each change.

A comprehensive evaluation framework for assessing Claude Code agents, commands, and skills. Provides LLM-as-Judge implementation patterns, multi-dimensional rubrics, bias mitigation techniques, and metrics for measuring agent quality across instruction following, completeness, tool efficiency, reasoning, and coherence.

Use when implementing any feature or bugfix, before writing implementation code - write the test first, watch it fail, write minimal code to pass; ensures tests actually verify behavior by requiring failure first

Ultimate Bug Scanner (UBS) is a comprehensive static analysis tool that automatically scans your code for bugs, security issues, and code quality problems. It integrates with Claude Code via hooks to run scans on file saves and blocks dangerous git commands like 'git reset --hard' or 'rm -rf' to prevent accidental data loss.

Coordinate multi-agent code review with specialized perspectives. Use when conducting code reviews, analyzing PRs, evaluating staged changes, or reviewing specific files. Handles security, performance, quality, and test coverage analysis with confidence scoring and actionable recommendations.