Each tool has a clearly distinct purpose: register/login handle authentication, while add_memo, list_memos, and delete_memo cover distinct memo operations. There is no meaningful overlap or ambiguity between any two tools.

Most tools follow a clear imperative verb_noun pattern like add_memo, list_memos, and delete_memo. register and login are standard auth verbs without a noun object, and list_memos uses a plural while delete_memo is singular, but the overall naming is predictable and readable.

Five tools is well-scoped for a simple memo server requiring authentication and basic memo management. Every tool earns its place, and there are no redundant or unnecessary additions.

The set covers registration, login, creating memos, listing memos, and deleting memos, but lacks an update/edit memo operation and an explicit logout tool. Editing an existing memo requires deleting and recreating it, which is a notable gap for a memo service.