Support notifications configuration

**Problem**
When working with models, 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. First clarify which notification settings and model error cases are in scope, then locate the relevant error-handling and configuration entry points. Done means notifications can be configured and error messages are detailed enough to support debugging and maintenance.

Written by the indexing model from the issue text.