Agents
AI agent keeps making the same mistake? Harness engineering, explained
The model is only one part of an agent. The loop, the tools, the permissions and the memory around it are the harness, and in 2026 OpenAI, Anthropic and Mitchell Hashimoto all described fixing agents there instead of in the prompt. Here is what that means and where the name came from.
Kernel · 2h ago · 11 min