ARCCHR0024: Read-model shape cannot be protected
Warning, in Measure or On. A protected read-model parameter has a shape Chronicle refuses: joins or children, an event-property key, an unsupported key, or a reducer with constructor dependencies or an observer event filter. Unfiltered dependency-free reducers are admitted.
Resolve the diagnostic
Section titled “Resolve the diagnostic”Read joined parts separately, append facts to the entity a model is keyed by,
use a constraint for uniqueness, or remove reducer dependencies/filters.
Use a string or Guid identity (including supported concepts).
If the read is only context, mark the parameter or model [Unprotected("why")].
Method-level [Unprotected] does not opt out injected parameters.
Boundaries
Section titled “Boundaries”The analyzer checks Handle/Provide dependencies and validator constructors. Off and explicitly advisory parameters are excluded. Source-visible fluent projection shapes are checked; runtime-only registrations, generation delivery (including Pinned), and definitions in other assemblies remain runtime-validated. A quiet analyzer is not proof of admission. No code fix is offered.