Harness Engineering paper breaks down how Claude Code, Codex and Gemini CLI are built
joemeno · x · 2026-10-06
A widely shared recommendation calls this one of the best papers on Harness Engineering. Starting from a simple definition — Agent = Model + Harness — it covers:
- What a harness actually is
- How today's coding agents are constructed
- Patterns repeated across Claude Code, Codex, Gemini CLI and peers
- Where the category is heading
- Practical advice for building your own
The author also links a companion article explaining Harness Engineering from scratch.
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