Here's a real workflow for using Composer to build a complete feature from scratch:

Example: Add User Authentication

1. Open Composer (Cmd+I)
2. Prompt: "Add JWT authentication to this Express API. Use the existing User model. Create login and register endpoints. Add an auth middleware. Follow the existing error handling patterns in @Folders src/middleware"
3. Review Composer's plan — it will list all files it intends to create or modify
4. Review each diff carefully
5. Accept changes
6. Run tests — ask Composer to fix any failures

Key Principle

Treat Composer output like a junior dev's PR — review every line before merging.

Reference:

Composer documentation

https://docs.cursor.com/composer/overview