Errors
validation_failed
The request did not satisfy the public API contract.
validation_failed means Everyn rejected the request because input was missing, malformed, unsupported, or inconsistent with the public contract.
Recovery guidance
Common causes:
- malformed JSON or multipart metadata
- missing idempotency key on mutating operations
- unsupported source type or filter
- invalid output schema
- field values outside documented bounds
Retry is appropriate only after the invalid request is corrected.