Building Agents that Don't Break Themselves

Our short summary of Fly.io’s engineering write-up. The full story, with all the detail, is on their blog.

Problem

Agents often delete or damage files when running commands, causing failures.

Fly created sandboxed Sprite containers and a persistent loop that isolates agent code, letting agents run safely without breaking themselves.

Want the architecture, code and numbers? They’re in the original post.