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Frontend Performance Investigator official github 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 DevTools Regression Investigator official github Reproduces UI regressions in the browser and pinpoints root causes using network and console evidence. GitHub Copilot ★ 40,369repo stars Blueprint Mode official github Executes strict workflows (Debug, Express, Main, Loop) to deliver clean fixes without guesses or conversational fluff. Best for disciplined code changes. GitHub Copilot ★ 40,369repo stars Accessibility Runtime Tester official github Tests web apps for keyboard operability, focus traps, form error states, and live region updates in runtime. Useful for catching WCAG regressions before deploy. GitHub Copilot ★ 40,369repo stars nextjs-developer VoltAgent Community Subagent for building full-stack Next.js 14+ apps with App Router. It sets up Server Actions, tunes Core Web Vitals, and handles SEO metadata. Claude Code 898installs Expert Nuxt Developer official github 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