Repo Mastery: Onboard to Any Codebase, Faster
Master the repository you work in, without leaving your editor.
Repo Mastery turns any repository into a guided learning system: architecture tours, key-file
walkthroughs, workflow and domain lessons, a repository glossary, flashcards, quizzes, comprehension
drills, and a mastery score. It is built for the moment every engineer and every team hits: you can
run the code, but can you explain it?
Understand it. Prove you understand it. Explain it.
Why Repo Mastery
AI now writes a large share of the code shipping to production. Teams inherit large, unfamiliar, or
AI-generated codebases and pay for it in slow onboarding, key-person risk, and shallow review. Repo
Mastery closes that gap by turning the repo itself into the curriculum.
- Onboard new engineers faster. A new hire opens the repo and gets a guided path through its
architecture, critical workflows, and key files, instead of a cold read.
- Reduce key-person risk (bus factor). Turn what one engineer knows into flashcards, quizzes, and
drills any teammate can learn from.
- Ramp up on AI-generated code. Prove you actually understand what the agent produced before you
own it in production.
- Stronger reviews and handoffs. Engineers who can explain the system review and hand it off
better.
What it does
- Repository overview and guided tours of architecture, workflows, domain entities, APIs, and
integrations.
- Key-file learning with evidence links that open the exact source file and line.
- Flashcards, quizzes, and comprehension drills generated from the repository's own knowledge.
- Mastery paths and progress tracking with an evidence-based mastery score and "what to learn
next" guidance.
- A repository glossary for the domain terms that matter in this codebase.
The Skills Tech loop
Repo Mastery teaches the repository. It hands off, contextually, to two sibling products and never
duplicates them:
| Step |
Product |
What |
| Understand |
OpenThunder |
Analyze, verify, and secure the repository; check whether a change is safe to ship |
| Prove |
Repo Mastery (this extension) |
Learn and prove you understand the repo: tours, lessons, flashcards, quizzes, drills, score |
| Perform |
Skills Tech Talk |
Practice explaining and defending what you learned, out loud |
Commands
| Command |
What it does |
Repo Mastery: Start Mastering This Repository |
Open the guided mastery experience for the current repo |
Repo Mastery: Open in a Full Tab |
Open the mastery experience in a full editor tab |
Repo Mastery: Understand It in OpenThunder |
Hand off to OpenThunder to analyze and verify the repo |
Repo Mastery: Practice Explaining It in Skills Tech Talk |
Practice explaining this repo out loud |
Repo Mastery: Open Dashboard in Browser |
Open the full Repo Mastery web app |
A Repo Mastery activity-bar panel and a status-bar entry give you one-click access, and the
in-panel toolbar cross-links Understand (OpenThunder) and Perform (Skills Tech Talk).
Requirements
None to try it. Open a folder with a git remote and click Start Mastering This Repository. Repo
Mastery detects the repository and loads its mastery experience from
app.repomastery.com. Once OpenThunder has analyzed a repo, its mastery
pack appears here automatically. Works in desktop VS Code and in web VS Code (github.dev / vscode.dev /
Codespaces).
Privacy and AI
- No AI. This extension calls no language models. There is no prompt-injection surface.
- Your source stays yours. The extension does not upload repository contents. It sends only the
git remote URL to load the matching mastery pack; analysis of the repo happens in OpenThunder, under
your control.
- Free for solo. Individual use of the full experience is free.
Settings
| Setting |
Default |
Description |
repomastery.appUrl |
https://app.repomastery.com |
The Repo Mastery app that hosts the mastery experience |
repomastery.openthunderUrl |
https://openthunder.dev |
OpenThunder, where you analyze and verify the repo |
repomastery.skillsTechUrl |
https://app.skillstechtalk.com |
Skills Tech Talk, where you practice explaining it |
Links
