Add configuration options for serialization

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

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

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

The issue names no files, tests, or entry points, and its title conflicts with the body’s request for improved handler error messages. Start by locating the handler serialization and configuration entry points, then confirm the intended options, error cases, and acceptance criteria with a maintainer before making changes.

Written by the indexing model from the issue text.