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• Document the full output schema for each tool. For search_products, specify: 'Returns an object with fields: products (array of {id, name, price, description}), total (integer), next_cursor (string or null).'
• Expand build_cart_mandates description from 40 chars to 100 - 150 chars explaining: What is a CartMandate? When to call this (after optimizing cart but before payment)? What does it return? E.g., 'Structures a shopping cart into an AP2-compliant CartMandate object (unsigned). Call this after cart optimization to prepare data for signature. Returns mandate ID, cart items, totals, and required signatures.'
• For complex object parameters (cart_plan, products, shipping_address), either embed inline JSON Schema 'properties' defining subfields, or reference external AP2 specification with field-level type hints and examples.
• Add error handling context: 'If no products match keywords, returns empty list. If product_ids are invalid, returns per-item error messages with suggestion to verify IDs via search_products.'
• Clarify pagination for search_products: 'Returns up to limit products. If more exist, response includes next_cursor. Use this in a follow-up call to fetch subsequent results.'
• Convert Japanese descriptions to English or provide English equivalents in code comments to enable LLM parsing. LLMs process English more reliably than Japanese in tool definitions.
• Add parameter constraints: 'limit must be 1 - 100' for search_products, 'product_ids must be non-empty array of positive integers' for check_inventory.