Refactor helpers for better readability

**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.

The issue names no files, tests, or entry points. Start by locating service error-handling paths and tracing how their messages are produced; done means the affected errors provide more descriptive debugging context and the relevant behavior is covered by checks where the project already has them.

Written by the indexing model from the issue text.