Add configuration options for notifications

**Problem**
When working with types, 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 notification configuration and type-related error handling in the Shell CLI. Clarify whether the intended work is configurable notifications or more descriptive type errors, then identify the relevant entry points and existing error tests. Done means the agreed configuration or error-message behavior is implemented and verified.

Written by the indexing model from the issue text.