Upgrade .NET, React, and Next.js apps to latest versions with multiple AI Agents

Teaching an AI agent to upgrade .NET, React, and Next.js apps for real — not just talk about it Every engineering team has that repo. The one running a framework version from three or four years ago. Everyone knows it needs an upgrade. Nobody wants to be the one who breaks production doing it. That's the problem UpgradePilot — an open-source, multi-agent upgrade pipeline — is built to solve. And this week we shipped the piece that made it stack-agnostic: real, working upgrade automation for .NET, React, and Next.js, including repos that mix a .NET backend with a React or Next.js frontend in the same codebase. Here's what that actually means, because "AI upgrades your code" is a claim that's earned a lot of well-deserved skepticism. The design principle: shell out to the real tool, never fake it The easy version of this feature is an LLM that reads your package.json, guesses at new version numbers, and writes some plausible-looking code changes. That's not what we built. Every step in UpgradePilot's pipeline calls the actual toolchain: .NET — real dotnet restore, dotnet build, dotnet list package --outdated, dotnet ef migrations add. Package version bumps are verified by an actual restore, not assumed to work. React / Next.js — real npm install, npm run build, npm outdated. Codemods run through the actual react-codemod and @next /codemod CLIs — we pulled the real transform names directly from those projects' GitHub repos rather than guessing, because a fabricated transform name just fails at runtime. Target versions aren't invented. PackageTargetVersions come from dotnet list package --outdated and npm outdated — the same commands you'd run yourself. Codemod selection isn't invented either. UpgradePilot pulls React's and Next.js's own GitHub release notes, classifies breaking changes, and matches them against a verified catalog of real codemod transforms. If a step can't do something for real, it says so — with a confidence score and an explanation — instead of prete