Took apart Claude Code, then turned it into a free course on harness engineering

By pauliusztin · 2026-10-24 · 3 points · 0 comments

The fastest way to learn harness engineering? Build Claude Code from scratch. Why harness engineering? LangChain kept the same model and changed only the harness. Their coding agent went from 53% to 67% on Terminal-Bench, a top coding-agent benchmark. From outside the top 30 to…

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