Sharpen your Git and TypeScriptagainst the clock

Timed challenges played in your browser, with a Socratic mentor that guides you without revealing the solution. One command and you are in.

Runs on your Claude Code subscription

No API keys, no new accounts, nothing to configure.

Explore challenges View on GitHub v0.2.1work in progress

sharpen

$npx @juanwmedia/sharpen

sharpen listening on http://127.0.0.1:4517

✓ arena ready in your browser

✓ mentor on your Claude Code subscription

$ npx @juanwmedia/sharpen

Sharpen opens a local arena in your browser: a real Git terminal or a TypeScript workspace, and a Socratic AI mentor that nudges without giving the answer. Every Enter validates against the real board state and any correct solution passes. Practice at your own pace in learn mode, or put the clock on in challenge mode.

The sharpen arena: briefing, Git terminal and live verdict panel for the Wrong branch, wet paint challenge — The arena in your browser: every Enter validates against the real board.

How to play

1 Install Claude Code if you do not have it yet: claude.com/claude-code
2 Install sharpen from npm:
npm install -g @juanwmedia/sharpen
3 Then launch it; the arena opens in your browser:
sharpen
or Or try it without installing anything:
npx @juanwmedia/sharpen
4 And to update when a new version ships:
sharpen update

Work in progress

Sharpen is under active development and your eyes make it better. The arena does not replicate all of Git or TypeScript yet: each command lands when a challenge needs it, faithful to the real behavior. If something breaks, a challenge limps, or you miss a command or a challenge that should exist, tell me. Issues, ideas and PRs are welcome.

Open an issue Browse the code

Sharpen your Git and TypeScriptagainst the clock

How to play

Work in progress

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Challenges