The municipal Department of Education and Training issued the requirement as part of measures to strengthen food safety at schools across the city.
Schools must review contracts and legal requirements for meal suppliers, canteens and collective kitchens, while ensuring suppliers do not provide more meals than their actual capacity allows.
School managers and health staff must directly monitor the food supply chain and meals delivered to schools, ensuring they meet required quality and nutritional standards.
Schools must provide parents with daily information on meal suppliers and ingredients, along with photos of food, purchase invoices, menus and images of meals actually served to students.
Parent representatives may also monitor food sources and meal preparation and assess the quality of meals.
Local authorities were asked to complete administrative procedures to ensure school meal services operate normally following recent organisational changes.
The department also said individual suppliers should not serve more schools than they can handle, warning that excessive workloads could cause delays or lead to subcontracting that may compromise food quality and safety.
