15:I[981,["658","static/chunks/658-a698693f56d0116a.js","183","static/chunks/183-6beeeb801c274aaa.js","474","static/chunks/app/%5Btype%5D/layout-631c4730b83c8223.js"],"Posts"] 16:T5ae,Hi HN!

I built CodeSprint because I realized getting good at typing code requires practicing syntax fluency, not just logic. I found myself screwing up on mock interviews not because I didn't know the algorithm, but because I fumbled the syntax. I needed a way to drill "Depth First Search in Python" or "Ring Buffer in C++" until my fingers actually knew the shape of the code.

The Engineering:

Renderer: Uses a heavily customized Monaco Editor instance. I'm using deltaDecorations to paint diffs directly onto the editor model without breaking syntax highlighting, and getScrolledVisiblePosition for a custom, low-latency caret.

Data Pipeline: I didn't want to hardcode snippets. I wrote a custom Bun script (scripts/sync-leetcode.ts) that reverse-engineers the LeetCode GraphQL API to pull real problem snippets, sanitizes them, and normalizes indentation.

Latency: To handle high WPM without UI lag, the typing engine isolates keystroke processing from the main React render cycle where possible.

Repo: https://github.com/cwklurks/codesprint Live Demo: https://codesprints.vercel.app/

I'm a 15-year-old student from Vancouver. Would love feedback on the typing engine feel vs. native VS Code!17:T4a7,Anthropic's Model Context Protocol (MCP) has made it easy to spin up servers that expose tools and data to LLMs.

A lot of these MCP servers run locally because they need access to your files, shell, browser, etc. The problem: they typically run with the same privileges as your user. If a server is buggy, misconfigured, or prompt-injected, it can do anything you can do: read SSH keys, exfiltra

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