Domain-first syntax
`CanShip.And.HighPriority` says what the rule means without ceremony or overloaded Boolean operators.
Specification pattern · C# 14
Business rules that read like business rules.
Compose named rules with terse, discoverable syntax—then evaluate them in memory or hand them to infrastructure without leaking a query API.
public static Spec<Order> ReadyToShip() =>
CanShip.And.HighPriority.AndNot.Suspended;A deliberately small idea
Readable at the call site. Honest at the boundary.
One rule tree
The same immutable specification supports fast matching, structured diagnostics, rendering, and translation.
No query leakage
Repositories accept `Spec<T>`. EF Core stays in infrastructure and materializes results before returning.
The useful boundary
Boolean rules in. Materialized answers out.
A specification does not carry sorting, paging, projections, includes, or tracking flags. Those are repository decisions—not Boolean rules.
Understand the EF Core boundary