Principlev1PR-551
Before deploying a new schema, verify it correctly handles…
Before deploying a new schema, verify it correctly handles every case the old schema handled successfully—a schema update that drops coverage of previous successes is a regression, not an upgrade.
Why This Is a Principle
Derives from Schemas as Knowledge Organization Structures (schemas organize knowledge) and The performance of an agent is bounded by the accuracy… (agent bounded by world model accuracy). This is the core backwards compatibility principle—WHAT standard a new schema must meet. The physics correspondence principle parallel makes this clearly prescriptive rather than descriptive. Extremely strong principle.