Improve error messages in api

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

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

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

Start by locating the API parser entry points and their current error-handling paths. Review how parser failures are reported and identify existing tests or command paths that exercise them; done means the relevant parser errors provide more descriptive debugging information without changing successful behavior.

Written by the indexing model from the issue text.