ALdia MCP exposes 19 tools for Argentine accounting/inventory management with consistent naming (verb_noun pattern) and clear descriptions. All tools have descriptions (194-char baseline met). However, schemas are incomplete: most parameters lack explicit type definitions in visible code, and output schemas are undocumented. Tool annotations are present (readOnlyHint, destructiveHint) but error handling lacks recovery guidance. The server demonstrates domain expertise (CUIT validation, fiscal rules, audit trails) but falls short of production-grade definition quality due to missing schema rigor and output documentation.

• Document output schemas for all 19 tools. Specify return fields (e.g., create_invoice returns {borrador_id: int, cliente_cuit: string, items: [...], total: float}). This enables LLMs to chain tools correctly.
• Add formal JSON Schema constraints: declare 'metodo' as enum ['efectivo', 'cheque', 'transferencia', 'tarjeta']; 'tipo' as enum ['entrada', 'salida']; 'cuit' with pattern '^\d{11}$' or '^\d{2}-\d{8}-\d$'; dates with format 'date' (YYYY-MM-DD).
• Implement pagination for search_products, search_customers, search_vendors, get_iva_report, get_audit_log. Add limit (default 20, max 100) and offset parameters. Return total_count and next_offset in responses.
• Enhance error messages with recovery guidance. E.g., 'CUIT not found: 20123456789. Try search_customers() with the client name first.' or 'Insufficient stock: product 42 has 5 units, requested 10. Check get_stock_status().'
• Add per-item success/failure for batch operations. If create_invoice with 10 items fails on item 3, return which items succeeded and which failed, not a blanket error.