Testing and QA: skills, plugins, subagents, slash commands and mcp servers

verify react skill Validates code changes against React repository requirements before committing. Runs Prettier, linter, Flow type checks, and tests. Claude Code CX Codex Cursor +1 1,200installs python-testing-patterns Seth Hobson skill This skill guides Python testing with pytest, fixtures and mocks. Use it when building a test suite or tracking down failing checks. Claude Code CX Codex Cursor 36,943installs web-design-reviewer official github skill This skill inspects a running website, spots layout, responsive, and accessibility issues, and can fix them in the source code. Use it when a UI review should lead to verified code changes. GitHub Copilot 13,957installs playwright-automation-fill-in-form official github skill Fills a preset form through Playwright MCP, uploads an image, and stops before submission. It fits the Playwright Live demo scenario. GitHub Copilot 13,693installs better-accessibility jakubkrehel skill Reviews an interface against WCAG 2.2 and fixes issues in the project’s styling system. Use it to check keyboard navigation and screen-reader behavior. Claude Code CX Codex Cursor +1 29,200installs javascript-typescript-jest official github skill This skill guides GitHub Copilot in writing JavaScript and TypeScript tests with Jest. Use it when you want concrete patterns for mocks, async tests, and test organization. GitHub Copilot 13,172installs pytest-coverage official github skill Runs pytest with coverage, flags lines that tests miss, and guides work toward 100% line coverage. Use it when coverage gaps need concrete test cases. GitHub Copilot 12,826installs code-reviewer VoltAgent Community subagent Reviews code changes for bugs, security flaws and maintenance issues. Use it before merging complex work or auditing a project. Claude Code 31,050installs fastify-best-practices mcollina skill Guides AI assistants in building Fastify backend servers with TypeScript or JavaScript. It covers plugin encapsulation, schemas, logging, and deployment patterns. Claude Code CX Codex Cursor +1 81,100installs sdf earthtojake skill This skill authors and validates SDFormat files for models and worlds, then helps prepare them for simulator handoff. Claude Code CX Codex Cursor +1 10,500installs java-junit official github skill Writes, reviews and fixes Java tests with JUnit, AssertJ and Mockito. Use it when adding, refactoring or debugging tests in Maven and Gradle projects. GitHub Copilot 11,632installs urdf earthtojake skill This skill helps create, validate, and debug URDF robot descriptions. Use it when working with links, joints, geometry, meshes, or inertial data. Claude Code CX Codex Cursor +1 10,400installs code-review-excellence Seth Hobson skill This skill guides pull request reviews, catches logic and security issues, and helps teams give specific feedback. Use it for review standards or developer mentoring. Claude Code CX Codex Cursor 30,193installs dotnet-upgrade official github skill Plan a .NET upgrade by reviewing project dependencies, choosing a migration order and preparing post-upgrade checks. GitHub Copilot 11,475installs srdf earthtojake skill This skill creates and validates MoveIt2 SRDF files paired with a URDF. Use it for planning groups, robot semantics, and review-ready handoff. Claude Code CX Codex Cursor +1 10,300installs agent-eval colbymchenry skill Compares agent behavior with and without CodeGraph on a real repository. Use it to audit retrieval quality and test a local or published CodeGraph version. Claude Code CX Codex Cursor +1 1,800installs testing-strategy official anthropics skill This skill designs testing strategies and test plans for a project. Use it when you need test types, coverage goals, or gaps in existing checks. Claude Code CX Codex Cursor +1 6,400installs apple-appstore-reviewer official github skill Reviews an iOS project from an Apple App Store reviewer’s perspective and ranks rejection risks. Use it before submitting an app for review. GitHub Copilot 11,295installs rtk-tdd rtk-ai skill This skill enforces a Red-Green-Refactor workflow for Rust and activates on implementation, testing, refactoring, and bug-fixing tasks. Claude Code CX Codex Cursor +1 2,100installs hatch-pet official openai skill Creates and packages animated pets and spritesheets for Codex. Use it to turn a character concept, reference image, or brand cues into a pet. Claude Code CX Codex Cursor +1 3,300installs playwright-best-practices currents.dev skill A reference skill for Playwright test architecture, locator design, and Page Object Model. Helps debug flaky runs, mock network requests, and audit accessibility. Claude Code CX Codex Cursor +1 98,200installs python-mcp-server-generator official github skill Builds Python MCP servers that expose functions, APIs, or databases as tools for AI clients. Use it when starting a server with MCP Python SDK v2. GitHub Copilot 10,418installs csharp-xunit official github skill This skill guides C# unit testing with XUnit, including data-driven cases. Use it when creating or reviewing tests in a .NET project. GitHub Copilot 10,328installs agentic-eval official github skill Use evaluation and refinement patterns to improve AI agent outputs. It suits code, reports and analysis with defined quality criteria. GitHub Copilot 10,213installs openspec-verify-change openspec skill Verifies that code implementations match OpenSpec specs, tasks, and design documents before archiving. Useful for validation before finalizing changes. Claude Code CX Codex Cursor +1 3,500installs agent-platform-eval-flywheel official google skill This skill evaluates AI models and agents on Google Cloud, helping build datasets, choose metrics, and investigate failures. Claude Code Gemini CLI CX Codex 8,334installs refactor-method-complexity-reduce official github skill Refactors a chosen method by moving complex logic into helpers. Use it when nested conditions or branching make a method hard to follow. GitHub Copilot 9,992installs scoutqa-test official github skill This skill runs exploratory web app tests through the ScoutQA CLI. Use it to check a user flow, accessibility, or a feature after making changes. GitHub Copilot 9,967installs deploy-checklist official anthropics skill Builds a release-readiness checklist covering CI, reviews, migrations, flags, deployment, and rollback. Use it before shipping production changes. Claude Code CX Codex Cursor +1 5,600installs fastapi-templates Seth Hobson skill This skill scaffolds FastAPI projects with async routes, dependency injection, and error handling. Use it when starting a Python API. Claude Code CX Codex Cursor 25,840installs kotlin-springboot official github skill This skill guides Spring Boot and Kotlin work, from project structure to tests and coroutines. Use it when an agent is writing or reviewing a backend service. GitHub Copilot 9,781installs a11y-debugging ChromeDevTools skill Audits web-page accessibility with Chrome DevTools MCP, covering semantics, ARIA, focus states, keyboard navigation, tap targets and contrast. Claude Code CX Codex Cursor +1 3,600installs ef-core official github skill This skill guides Entity Framework Core reviews and suggests practices for models, queries, migrations, security, and tests. Use it when EF Core code needs a focused check. GitHub Copilot 9,594installs security-requirement-extraction Seth Hobson skill Turns a threat model and business context into testable security requirements: user stories, acceptance criteria, test cases. Claude Code CX Codex Cursor 24,845installs openapi-to-application-code official github skill Generates an application from an OpenAPI spec using the chosen framework's conventions. Use it when starting an API project from a specification. GitHub Copilot 9,448installs debug-optimize-lcp ChromeDevTools skill Breaks Largest Contentful Paint into four sequential stages and shows exactly where the main content load is bottlenecked. Claude Code CX Codex Cursor +1 3,500installs project-workflow-analysis-blueprint-generator official github skill A GitHub Copilot skill that maps project architecture and documents end-to-end workflows. Use it when you need implementation blueprints for similar features. GitHub Copilot 9,366installs java-refactoring-extract-method official github skill This skill guides Extract Method refactoring for complex Java methods while preserving behaviour. Use it when a method needs smaller, focused units backed by tests. GitHub Copilot 9,284installs e2e-testing-patterns Seth Hobson skill This skill helps build E2E tests for critical user journeys with Playwright and Cypress. Use it when debugging flaky tests or setting testing standards. Claude Code CX Codex Cursor 24,343installs breakdown-test official github skill Creates test strategies, QA plans, and issue checklists from feature documents. Use it when planning test work for a GitHub project. GitHub Copilot 9,264installs