Builders do not begin with tools. They begin with system behavior.
The builder lens starts by defining what a system is supposed to do, identifying where failure may occur, and structuring an investigation before proposing changes. This is the operating logic behind Builder Lab.
Builder Principle
A builder does not jump directly to fixes. A builder defines expected behavior, isolates likely failure points, tests assumptions, and only then changes the system. The final output must remain understandable and rebuildable by others.