Three tools with basic schemas and descriptions present, but significant gaps in parameter documentation and output schema clarity. Tool names follow verb_noun pattern (addToCart, removeFromCart, listCart) which is good. Descriptions exist but are generic and lack context about when to use each tool or what they return. Parameter descriptions are minimal, 'Product ID' and 'Product ID to remove' lack format/constraint details. No documented output schemas, error handling guidance, or recovery paths. No tool annotations (readOnlyHint/destructiveHint). The server appears to be a web-based shopping cart interface, not a true MCP server with proper transport, transport is UNKNOWN, which is a critical blocker.

• Document output schemas for all tools. Example: addToCart should return {success: boolean, cartTotal: number, itemCount: number, message: string}. listCart should return {items: Array<{id: number, name: string, price: number, quantity: number}>, total: number, itemCount: number}.
• Add min/max constraints to numeric parameters. Example: 'productId (number, 1 - 999999): The unique product ID' and 'quantity (number, 1 - 1000, default 1): Number of units to add'.
• Add tool annotations to distinguish safe from destructive operations. Mark addToCart and removeFromCart with destructiveHint: true. Mark listCart with readOnlyHint: true.
• Expand tool descriptions to include WHEN to use each tool and WHAT it returns. Example: 'Add a product to the shopping cart. Call this after the user selects a product. Returns the updated cart total and item count.'
• Add error handling guidance. Example: 'If the product ID is invalid, returns {success: false, error: "Product not found", availableProducts: [...]}'.