104 Exercises: Checking the Agent's Work

Setup

• Claude Code installed and working, with the guidance file you wrote in 102.
• A project with a test suite you can run locally and a few weeks of git history. The sample repository in reference/sample-repo-spec.md works if you have none.
• A shell. The examples use zsh, the shell the course's evidence comes from.

Exercise 1: Break the Fix (20 minutes)

Objective: Show that your tests can go red for the change you have just made.

Instructions: