API Response Diff Tool — illustrative example

INPUT
Compare response field sets. Old: {"id":"A1","name":"Ada"}. New: {"id":"A1","display_name":"Ada"}. No API compatibility contract supplied.

RESULT
Unchanged field: id.
Removed field: name.
Added field: display_name.
Potential impact: clients reading name may fail or lose displayed text.
A rename is plausible, but the samples alone do not prove semantic equivalence or the full compatibility policy.

REVIEW
Separate structural changes from value changes. A changed example value does not necessarily break an API contract, while a removed field may matter.

This is a teaching example, not a live execution record.