Improve core performance

**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 file, test, or entry point is named. Start by locating the service-related error handling in the repository and reviewing how current messages are produced. Done should mean that service failures provide clearly defined, more detailed messages and that the relevant behavior is covered by tests.

Written by the indexing model from the issue text.