Update services documentation

**Problem**
When working with lib, 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 the services documentation and the relevant lib error-handling paths, then define the missing cases and verify that the resulting messages are more descriptive and useful for debugging.

Written by the indexing model from the issue text.