app.build is an open-source AI agent for generating production-ready full-stack applications from a single prompt.

• Full-stack web apps with Bun, React, Vite, Fastify and Drizzle
• Neon Postgres database provisioned instantly via API
• Applications tested ahead of generation with smoke tests using Playwright
• GitHub repository with complete source code
• CI/CD and deployment via the app.build platform
• Automatic validation with ESLint, TypeScript, and runtime verification

npx @app.build/cli

This agent doesn't generate entire applications at once. Instead, it breaks down app creation into small, well-scoped tasks that run in isolated sandboxes:

1. Database schema generation - Creates typed database models
2. API handler logic - Builds validated Fastify routes
3. Frontend components - Generates React UI with proper typing

Each task is validated independently using ESLint, TypeScript compilation, test execution, and runtime logs before being accepted.

This is the agent repository containing the core code generation engine and runtime environment. The CLI and platform code are available in the platform repository.

See CONTRIBUTING.md for development setup and contribution guidelines.

Local development instructions are available in CONTRIBUTING.md.

Built to showcase agent-native infrastructure patterns. Fork it, remix it, use it as a reference for your own projects.