Harness Engineering 101: The LLM is the brain, the harness is the body

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Every turn, you send the entire conversation as a JSON array and get text back. One Harness, Many Brains — model routing, prompt tiers, cost engineering B. Retries, Rate Limits, and Streaming — the unglamorous plumbing, plus how streaming works on the wire mdbook build # static site into . /book cd src/diagrams && python3 gen_all. py # Python 3. 10+, matplotlib The prose — every chapter and appendix (the . md files under src/) — The code — the . py files under src/harness/ and src/diagrams/, and MIT License.

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