Vegan is on the menu, but the same kitchen also prepares what you avoid, so cross-contamination is possible. Tell staff what you react to, and ask how your dish is prepared before you order.
A soft serve shop from Hawaii in Noe Valley that says its banana soft serve is dairy-free and its entire menu vegan-friendly except for local honey. Peanuts and tree nuts are handled in the kitchen, and some toppings are reported to contain gluten.