Strong foundation with 8 well-named tools following verb_noun convention (search_, get_, create_, update_, apply_, select_, complete_). All tools have descriptions (avg 95 chars, within 10-1024 baseline). Input schemas are complete with proper JSON Schema structure, types, and enums. However, output schemas are entirely undocumented, LLMs cannot predict response structure for downstream chaining. Parameter descriptions are present but sparse (avg 45 chars vs 72 baseline). Missing error handling guidance and recovery paths. No tool annotations (readOnlyHint/destructiveHint) despite clear risk classification. Checkout workflow tools lack dependency documentation (e.g., 'create_checkout must precede update_checkout').

• Document output schemas for all 8 tools. Define response structure with typed fields (e.g., search_products returns {products: [{id, name, price, in_stock}], total_count, has_more}). Include all fields needed for downstream tool chaining (e.g., create_checkout response must include session_id so update_checkout can use it).
• Add tool annotations to schema: set readOnlyHint=true for search_products, get_product, get_order; set destructiveHint=true for complete_checkout; set idempotentHint=true for select_shipping (same option selected twice = no change). This enables agents to reason about retry safety.
• Enhance parameter descriptions with format/constraint guidance. E.g., discount_code: 'Coupon code (e.g., SAVE10, SAVE20, FREESHIP, WELCOME). Case-sensitive.' shipping_option_id: 'Must be one of: shipping_standard ($5.99), shipping_express ($12.99), shipping_next_day ($24.99), shipping_free (orders >$100).'
• Document checkout workflow dependencies in tool descriptions. E.g., update_checkout: 'Updates an existing checkout session created via create_checkout. At least one of add_items, remove_items, shipping_address, billing_address, shipping_option_id, or discount_code must be provided.' complete_checkout: 'Finalizes checkout. Session must have items, shipping_address, and shipping_option_id set.'
• Add error handling guidance. E.g., complete_checkout: 'Returns 400 if session missing items, shipping address, or shipping method. Returns 404 if session_id not found. Returns 409 if session already completed.' Include recovery hints: 'If shipping address missing, call update_checkout with shipping_address parameter.'

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

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