Attach scope metadata to every schema — where it was built…

Store each schema with explicit scope documentation specifying the domain where it was built and the structural conditions it assumes, treating scope as mandatory metadata rather than optional annotation.

When This Fires

Documenting any operating schema in your personal system
Before applying a schema in a new domain or context
When a schema that "always worked" suddenly fails (scope mismatch likely)
During schema audits when checking whether schemas are applied within their validated scope

Common Failure Mode

Storing schemas without scope: "Move fast and break things" with no notation that this was built for early-stage consumer products with low switching costs. Applied to healthcare software, financial systems, or late-stage enterprise products, it produces catastrophic outcomes. The schema isn't wrong — it's out of scope.

The Protocol

For every schema you store: (1) Record: "Built in [domain/context]." (2) Record: "Assumes [specific structural conditions]." (3) When applying the schema in a new context, check: do the current conditions match the documented scope? (4) If conditions match → apply with confidence. If conditions differ → adapt the schema to the new conditions before applying, or find a schema with matching scope.