Server has 17 tools with explicit schemas and descriptions, but quality is inconsistent. Most tool descriptions are adequate (50-150 chars), but parameter descriptions are sparse or missing entirely. Many parameters lack type constraints (enums for categorical values like supermarkt codes, dieet options). No output schemas documented. Error handling is absent from visible code. Tools like 'plan_boodschappen' and 'optimaliseer_boodschappenlijst' combine multiple concerns. Parameter naming is inconsistent: 'supermarkt' vs 'supermarkten', 'query' vs 'product'. No evidence of input validation or recovery guidance.

• Add output schemas to all tools. Document return fields, types, and pagination (e.g., 'Returns array of {product_name: string, price: number, supermarkt: string, url: string}' with total_count and next_cursor for pagination).
• Convert categorical parameters to enums: supermarkt → enum [ah, jumbo, lidl, kruidvat, etos, trekpleister, hollandbarrett, douglas]; dieet → enum [vegetarisch, vegan, glutenvrij, none]; categorie → enum [haarverzorging, mondverzorging, ...].
• Add descriptions to all parameters with constraints: 'limit: integer, 1-50, default 10 (max results per page)'; 'max_afstand: number, 1-100 km, default 10'; 'dagen: integer, 1-365, default 30'.
• Implement error handling with recovery guidance: 'Product not found. Try search with a shorter query or different spelling. Available categories: [list]. Call zoek_producten() with a category filter.'
• Consolidate overlapping tools: merge 'optimaliseer_boodschappenlijst' and 'plan_boodschappen' into a single 'plan_shopping' tool with optional menu generation. Make 'plan_winkelroute' accept either a product array or a saved list_id.