Sandbox Coding Agents Suck (right now)

Background sandbox coding agents like Cursor, Codex, and Copilot have not really taken off. As a YC founder who uses coding agents daily, here is why. 1) They cannot run the code or tests If I see one more PR from Copilot that does not compile or fails a basic typecheck, I am going to lose it. What is missing: Coding agents should run on machines with the full developer environment. That means…