Server has 4 well-named tools with complete input schemas and enum constraints on category/payment_method. Descriptions are present and moderately detailed (60-120 chars), explaining what each tool does and access control. However, descriptions lack actionable recovery guidance for errors, output schemas are not documented, and there is no error handling guidance for LLMs. Tool composition is sound (single responsibility), but missing pagination for list_user_expenses and no documented return types. Security model (identity-aware via Entra) is strong but not reflected in tool descriptions.

• Document output schemas for all tools. Example: 'Returns {expense_id: string, date: string, amount: number, category: string, description: string, payment_method: string, created_at: string}'.
• Add error handling guidance to descriptions. Example for delete_expense: 'Returns 403 if user is not the expense owner. Returns 404 if expense_id not found.'
• Add pagination to list_user_expenses: accept limit (1-100, default 20) and offset parameters; return total_count and has_more in response.
• Mark delete_expense as destructive in description: 'Permanently deletes an expense. This action cannot be undone.' Consider adding a confirmation step.
• Clarify permission model in get_expense_stats: 'Returns 403 Forbidden if user lacks admin group membership and user_id != authenticated user. Contact admin to request access.'

Inferred effective spec: <=2025-11-25.

• Relies on Logging (deprecated) - log to stderr or use OpenTelemetry