Schema Validator
Structural coherence at the boundary of the system. OpenAPI/GraphQL schema validation, Terraform plan, Kubernetes admission validation, SQL parser/type checker — all of these answer: is this a valid instance of the expected shape?
Where a type checker validates internal coherence, schema validators validate boundary coherence: does this API request match the contract? Does this infrastructure definition resolve?
Sensor properties
| Property | Value |
|---|---|
| Oracle strength | High — schema violations are definitive |
| Independence | High — schema is external to the implementation |
| Scope | Service-level |
| Feedback latency | Seconds |
| Actionability | Guiding — shows which field violates which constraint |
| Type | Predictive |
What it cannot detect
Schema validation cannot detect whether a valid request produces the correct behavioral result. It checks shape, not meaning.