Phoenix & mix

Prerequisites

• Elixir 1.17+ and Erlang/OTP 27+ installed
• An existing Phoenix project (or create one with mix phx.new myapp)
• Claudette installed and running

Configuration

Create a .claudette.json in your project root:

{
  "scripts": {
    "setup": "mix deps.get && mix ecto.setup"
  },
  "instructions": "This is a Phoenix 1.7 project using LiveView. Use Elixir best practices and pattern matching."
}

This setup script will:

1. Fetch Hex dependencies
2. Create the database, run migrations, and seed data

Add to Claudette

1. Open Claudette and click + Add Repo
2. Select your Phoenix project directory
3. Create a new workspace — dependencies install and the database sets up automatically

Example Prompts

“Add a LiveView for real-time chat with message persistence in Postgres”

“Create a context module for managing user profiles with CRUD operations”

“Set up OAuth2 authentication with GitHub using Ueberauth”

Tips

• If your project doesn’t use Ecto, simplify the setup to just mix deps.get
• For umbrella apps, adjust the instructions to specify which app the agent should focus on