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Built the world's simplest code runner in 5 mins with Sprites. This is doubly cool. First off, how it works: User writes some scary JavaScript, which then gets run in a new Sprite. Sprites are literally built for running random code, so bring on the footguns. 🧵

27/1/26, 5:50 pm0 reposts1 like

Fly.io

@fly.io

27 Jan

Secondly, we built this whole thing with a single prompt. We can do this with confidence because Sprites were designed to be the perfect place for Claude to just go nuts. No need to micromanage. Just give it a task, and then go make some lunch. It's that easy.

Fly.io

@fly.io

27 Jan

Last note: If you were building a code runner like this For Real, you'd be a lot smarter about it. You'd stick to one Sprite per user, or perhaps project. No shared Sprites between customers, tho. (That would be rude) To learn more, checkout sprites.dev !

sprites.devSprites - Stateful sandboxes