Interface RuleValidationIssueAlpha

Short machine-readable tag for the kind of issue. Useful when something more than message is needed, for example, branching a UI on the failure type.

Documented values:

• unknown-ref, a ref points at an id that is neither a registered primitive nor a known saved rule.
• args-mismatch, the args on a ref don't match what the primitive expects. Only emitted by implementations that can introspect a primitive's args (e.g. via a separate schema mechanism). The contract does not require args validation.
• cycle, saved rules reference each other in a loop.
• missing-slot, the primitive reads a context key the caller didn't list in available.
• args-on-saved-rule, a ref to a saved rule carries args, which are ignored. Flagged so the author can clean it up.

The list is open: implementations may emit codes not listed here, and future releases may add new ones. If a code is unfamiliar, fall back to message.

Human-readable description.

Where in the rule tree the issue is, property names and array indices in order. Empty when the issue applies to the rule as a whole.