Phase 3: The Generate-Validate Loop · 90 min · Claude Code · Git · Python

Project: Spec'd & Validated Prototype

phases 0–3 ends here: one product, a real spec, a real context architecture, passing tests, a clean commit history, and a design doc someone else could actually review.

What you will learn

Assemble a spec, a validated context architecture, passing tests, and a clean commit history into one working prototype milestone
Write a design doc that explains architecture decisions and alternatives considered, not just what was built
Distinguish a prototype that merely runs from one that is genuinely spec'd and validated
Run your course-long product through a consolidated phases 0–3 readiness gate before calling the milestone done

Introduction

Project: Spec'd & Validated Prototype

Objective

Run a consolidated gate combining spec completeness, context architecture health, test pass rate, commit message traceability, and design doc completeness into one Project 1 readiness report.

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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