Improve store performance

**Problem**
When working with routes, 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 or tests. Start by locating route handling and the current error paths in the Shell-based terminal agent, then determine the expected descriptive messages and verify them with the project's existing checks. Done means error handling provides more useful debugging information.

Written by the indexing model from the issue text.