Part 1: Intro to Claude Code

Spec-Driven Development

The 3D Printing Analogy

3D Printing
CAD File / Blueprint
Precise specifications & measurements
3D Printer
Autonomous execution layer-by-layer
Physical Object
Tangible result matching spec
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Claude Code
SPEC.md
Spec Document
Requirements, architecture, constraints
> claude Building... ████████░░
Claude Code
Autonomous AI agent execution
def main(): app.run()
Working Software
Functional code matching spec
Key Insight
The quality of output depends on the quality of the specification.
Garbage spec in → garbage out. Precise spec in → precise result out.