Claude Code in Modal Demo

Demonstrates running Claude Code inside a Modal container. Claude Code adds a checkout API endpoint to a simple pottery shop Express app — entirely autonomously in the cloud.

Setup

1. Install Modal: pip install modal
2. Authenticate: modal setup
3. Create a Modal secret named anthropic-api-key with your Anthropic API key:

   modal secret create anthropic-api-key ANTHROPIC_API_KEY="sk-ant-..."

Run

modal run run_claude_in_modal.py

This builds a container with Node.js and Claude Code, copies in the pottery shop app, and asks Claude Code to add a POST /api/checkout endpoint. The output shows Claude's work and the resulting git diff.

What's inside

• pottery-shop/ — A minimal Express API with product listings
• run_claude_in_modal.py — Modal script that builds the image and runs Claude Code