Improve error messages in config

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

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

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

No files, tests, or entry points are named. Start by locating the configuration and service error-handling paths, then review how current errors are surfaced and run the existing checks; done means errors provide more descriptive debugging information without breaking current behavior.

Written by the indexing model from the issue text.