Improve auth performance

**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.

The payload names no files, tests, or entry points. Begin by locating the authentication and type-handling paths; completion should provide the requested authentication performance improvement and more descriptive error messages, though the issue does not define measurable acceptance criteria.

Written by the indexing model from the issue text.