Took apart Claude Code, then turned it into a free course on harness engineering
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 the top 5. Same model. Better harness. Over the past few months, I've taken apart Claude Code, OpenCode, and Pi to see how they work under the hood. And you don't need to ship a coding agent for this to pay off. The same
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points · 4 votes
2026-10-25 11:00:29.565Z
cumulative since publication
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Source account: 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 the top 5. Same model. Better harness. Over the past few months, I've taken apart Claude Code, OpenCode, and Pi to see how they work under the hood. And you don't need to ship a coding agent for this to pay off. The same
Available context
Source votes: 4 votes (Oct 25, 2026 UTC; cumulative since publication); previous same-scope observation: 4 (Oct 25, 2026 UTC). These observations do not establish demand growth. Recent records to compare: “Stanford CS 329Z: Engineering AI Agents” (Hacker News, Nov 13, 2026); “United Airlines blocks AI agents from booking flights” (Hacker News, Nov 13, 2026). Shared themes are navigation hints; they have not been verified as the same need or independent corroboration.
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This record has not been assigned a sufficiently supported main content category. No commercial or performance conclusion is generated.
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