Phase 4: Harness Engineering · 40 min · Claude Code · Python
Agent = Model + Harness
Two teams, the identical model, wildly different reliability. The difference was never the model.
What you will learn
- Explain 'agent = model + harness' and why the harness, not the prompt, is the durable engineering deliverable
- Name the six components of a production harness: rules, skills, tools, tests, feedback loops, approval gates
- Predict how reliability changes when you swap the model but keep the harness, versus keep the model but strip the harness
- Audit a real project for which harness components are actually present
Introduction
Agent = Model + Harness
Objective
Scan a real project directory for evidence of each of the six harness components and produce a scored (0-6) report with specific recommendations for missing pieces.
Unlock the full lesson
You've read the first 2 sections. The rest of this lesson covers The Problem, The Concept, Build, Check Yourself, Key Terms & Next — plus a hands-on lab, quiz, and project artifact.
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