The obvious way to improve a coding agent is to make it more capable: a stronger model, a wider context window, more tools, more room to act on its own. That is not where my problems come from. My agents seldom fail because they reason badly. They fail because they take the shortest path to something that looks finished and skip the process that was supposed to make the result trustworthy.
Sandboxing an AI Coding Agent: The Harness Owns the Boundaries
Jul 3, 2026
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1 min read