Consider deprecating old api API

**Problem**
When working with validation, the error messages could be more descriptive.

**Suggestion**
Improve error handling and add detailed error messages.

**Context**
This would help with debugging and maintenance.

Start by locating the validation and error-handling entry points, then search for references to the old API named in the title. Clarify whether the intended work is API deprecation, more descriptive validation errors, or both; the issue is done only when that scope and its expected messages are defined.

Written by the indexing model from the issue text.