StackPatch is a CLI tool designed to patch production-ready authentication and other features directly into Next.js projects. It allows developers to add functionality without restructuring their applications or dealing with boilerplate bloat.

The tool offers auto-detection capabilities that instantly scan projects to identify frameworks, folder structures, and key configuration files. This enables StackPatch to apply changes safely with zero manual setup regardless of how customized the codebase may be. It features smart code injection that respects existing structure and conventions, injecting code only where needed. StackPatch provides a file tree preview showing exactly what files will be added before applying patches.

StackPatch works seamlessly with zero configuration required - no config files or setup needed. Users simply run commands like 'npx stackpatch add auth' and the tool auto-detects the framework and makes the application ready to use. All generated code lives in the user's repository with no magic or black boxes, providing clean, readable code that's fully editable with no dependencies.

The tool integrates authentication into Next.js apps by connecting NextAuth.js with auth providers and adding components like AuthSessionProvider and Toaster to layout files. It creates login and signup pages while maintaining full reversibility - all changes are tracked in '.stackpatch/manifest.json' allowing safe reversion with a single command.

StackPatch targets developers working with Next.js applications who need to add production-ready features quickly. It integrates with existing Next.js projects and supports features like authentication with providers including Google and GitHub.