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

swiftpm-macos official OpenAI skill Builds, runs, and tests SwiftPM macOS packages and executables. Use it when Package.swift is the main entry point and no Xcode project is present. CX Codex GP ChatGPT 58installs example-skills official anthropics plugin A collection of Claude skill examples for web testing, MCP work, design and documents. Use it to inspect skill structure or start a custom skill from a template. Claude Code Claude.ai ★ 183,434repo stars ios-simulator-browser official OpenAI skill Mirrors an iOS Simulator into the Codex in-app browser and renders SwiftUI previews from Swift packages with hot reload. Useful for testing UI and capturing visual proof without Xcode Canvas. CX Codex GP ChatGPT 53installs telemetry official OpenAI skill This skill adds and verifies macOS runtime telemetry with Logger. Use it to trace windows, sidebars, menus, and user actions during debugging. CX Codex GP ChatGPT 52installs test-triage official OpenAI skill Triages macOS test failures across Xcode and SwiftPM. It narrows failing scopes and separates flaky tests or setup issues from actual regressions. CX Codex GP ChatGPT 51installs game-studio official OpenAI skill Helps choose a stack and plan a browser game from its core loop through playtesting. Use it when the implementation path is still open. CX Codex GP ChatGPT 50installs chatgpt-app-submission official OpenAI skill Inspects a ChatGPT Apps MCP server and prepares the submission JSON. Use it before review to collect app info, test cases, and findings. CX Codex GP ChatGPT 29installs validation official OpenAI skill This skill checks whether candidate security findings hold up. Use it to validate findings from discovery, not to start a full repository scan. CX Codex GP ChatGPT 29installs superpowers obra plugin The plugin guides an agent from task discussion and planning through subagent development, code review, debugging, and TDD. Use it when the workflow matters. Claude Code CX Codex ★ 304,495repo stars java-upgrade official github skill Guides a Java project through a JDK upgrade and helps adopt newer language features. It covers 11 to 17, 17 to 21, and 21 to 25. GitHub Copilot 6installs agents-sdk official OpenAI skill Builds, runs, and tests OpenAI Agents SDK apps from Codex. Turns a prompt, repo, or session into a working agent with tools and eval tests. CX Codex GP ChatGPT 22installs mattpocock-skills Matt Pocock plugin A set of skills for grilling, TDD, code review, and specification work. Use it when an agent needs to clarify the task before changing the code. Claude Code ★ 302,251repo stars agent-browser official Vercel Labs skill Automates browser actions via CLI, takes DOM snapshots, clicks elements, and verifies dev servers. Helps AI agents inspect web interfaces directly. CX Codex GP ChatGPT 20installs android-performance official OpenAI skill Captures Simpleperf CPU profiles, Perfetto traces, and gfxinfo metrics via adb. Helps diagnose jank and heavy functions in Android apps. CX Codex GP ChatGPT 19installs pw-review Alireza Rezvani skill pw-review audits Playwright tests for anti-patterns, coverage gaps, and weak practices. Use it for one test file, a directory, or the project testDir. Claude Code 19installs testing-data-visualizations official OpenAI skill This skill establishes test strategies for charts, dashboards, and diagrams. It separates unit, component, visual regression, and E2E coverage without brittle pixel snapshots. CX Codex GP ChatGPT 18installs pw-init Alireza Rezvani skill Sets up Playwright e2e testing in an existing project. Use it when you need a config, starter test, npm scripts, and CI coverage tailored to the project. Claude Code 15installs agent-browser-verify official Vercel Labs skill Checks a dev server page in the browser for loading issues, console errors, and missing UI elements. Use it to verify a running project before moving on. CX Codex GP ChatGPT 14installs design-qa official OpenAI skill A skill for side-by-side design and implementation comparison before handoff. Works with Figma, screenshots, and URLs; catches visual gaps in layout, typography, and interaction states. CX Codex GP ChatGPT 14installs microsoft-store-publisher official github skill Prepares Windows desktop apps for Microsoft Store publication, including MSIX checks, WACK validation, and Partner Center submission work. GitHub Copilot 3installs github-issue-creator microsoft skill Converts voice notes, raw logs, and screenshots into structured GitHub-flavored markdown issue reports. Saves them directly to /issues/ in your repository. Claude Code GitHub Copilot 63installs analyze-data-quality official Data Analytics Maintainers skill Evaluates whether datasets and metric tables are reliable enough for dashboards or models. Helps catch duplicates and anomalies. CX Codex GP ChatGPT 9installs verification official Vercel Labs skill Traces and tests full user flows end-to-end across browser, API, and data layers when a dev server starts or something breaks. CX Codex GP ChatGPT 8installs spinning-up-deep-rl Alireza Rezvani skill A deep RL knowledge base for Claude Code, covering algorithms, policy gradients, and silent bugs. Use it when building or checking RL experiments. Claude Code 8installs java-testcontainers official github skill Helps write Java integration tests using Testcontainers 2.x and JUnit Jupiter with Docker dependencies. Useful when adding container tests or migrating from version 1.x. GitHub Copilot 1installs java-debugging official github skill A skill that walks the agent through finding a Java bug: reproduce, narrow down, test one hypothesis, attach a debugger. Useful once logs stop explaining anything. GitHub Copilot 1installs web-perf official Cloudflare skill Audits web page performance using Chrome DevTools MCP. Measures Core Web Vitals and inspects render-blocking assets. CX Codex GP ChatGPT 5installs validate-data official Data Analytics Maintainers skill Audits analytical reports, SQL queries, metrics, and charts before sharing them with stakeholders or basing decisions on them. CX Codex GP ChatGPT 4installs circleci-cli official CircleCI skill Operates and troubleshoots CircleCI pipelines via the CircleCI CLI. Useful for validating configs, checking build failures, and triggering jobs directly from Codex. CX Codex GP ChatGPT 4installs Expert Vue.js Frontend Engineer official github subagent GitHub Copilot subagent specialized in Vue 3, Composition API, TypeScript, and component architecture. Builds frontends, migrates from Vue 2, and optimizes rendering. GitHub Copilot ★ 40,369repo stars Software Engineer Agent official github subagent Autonomously writes code to specification, executes tests, and resolves ambiguities without asking for manual confirmations. GitHub Copilot ★ 40,369repo stars Expert Nuxt Developer official github subagent Guides Nuxt 3 and Nitro development with TypeScript typing. Helps configure data fetching via useFetch, resolve hydration issues, and structure server routes. GitHub Copilot ★ 40,369repo stars gem-reviewer official github subagent Runs independent reviews of plans, tasks, code, configs, and integrations. Emits strict JSON validation reports for orchestrators without touching source files. GitHub Copilot ★ 40,369repo stars gem-code-simplifier official github subagent A refactoring subagent that removes dead code and drops complexity. Handy when cleaning up messy logic without altering existing behavior. GitHub Copilot ★ 40,369repo stars Frontend Performance Investigator official github subagent Diagnoses runtime web performance issues, layout shifts, and Core Web Vitals regressions by connecting browser traces directly to your code. GitHub Copilot ★ 40,369repo stars C++ Expert official github subagent Provides guidance on modern C++ following ISO standards and C++ Core Guidelines. It helps write clean architecture, refactor legacy code, and set up testing. GitHub Copilot ★ 40,369repo stars Doublecheck official github subagent Verifies AI-generated text by finding web sources and highlighting hallucination risks. Useful before publishing content containing legal citations, statistics, or API syntax. GitHub Copilot ★ 40,369repo stars DevTools Regression Investigator official github subagent Reproduces UI regressions in the browser and pinpoints root causes using network and console evidence. GitHub Copilot ★ 40,369repo stars Delphi Expert official github subagent Assists with Object Pascal development in Delphi projects. It covers VCL, FMX, FireDAC data access, memory safety, and unit registration in project files. GitHub Copilot ★ 40,369repo stars Clojure Interactive Programming official github subagent Clojure pair-programming agent enforcing REPL-first workflows before saving files. It prevents silent fallbacks and protects pure functional architecture. GitHub Copilot ★ 40,369repo stars