/sentences/meaning
Interfaces define integration boundaries.
Rigid boundaries protect systems from silent translation errors.
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An integration boundary is where one system’s assumptions meet another system’s requirements. When we do not define these boundaries explicitly, we invite silent translation failures.
Clear interfaces act as translation contracts. They isolate changes within a single component, ensuring that internal refactoring does not ripple outward.
By establishing rigid data schemas at every interface, we protect the integrity of the entire system.
What this changes in practice: validate all external system inputs and outputs against strict schemas at the boundary.