Practice for the day it doesn't work on your code.
The method is free: every skill, the full flow, and the public skills repo. The course is what sits next to you when you run it on your own codebase and get stuck.
It isn't built yet. There's no price and no date. I'd rather tell you that than invent a countdown.
What it will contain
- Practice repos with planted defects.
Find the code nobody asked for, and the tests that prove nothing, in a codebase where the answers are known.
- A scoring harness.
Check your own results without me: did you delete what should go, and keep what should stay?
- A diagnosis guide.
Symptom, likely cause, fix. Built from the questions people actually get stuck on.
- Guides for your stack.
Legacy code, a monolith, a service with few tests, and getting mutation testing running on each.
- Writing your own skills.
From noticing you keep repeating something to a finished skill.
- A team rollout kit.
Review standards, pull request templates and a pilot plan. Sold as team seats.
Who it's for
Developers who already use an agent such as Claude Code, Codex or Cursor on a real codebase with tests, get results that are almost right, and don't yet trust the output.
It's not for beginners, greenfield builds, codebases with no tests at all, tool comparisons, or people who avoid AI on principle.
It works with any agent. The method is built on tests and small steps, not on one tool.