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The store's databases is not postgres's postgres_list_databases, and a holder may serve both. A claim's serves names the seat's verbs the module implements for the role; absent, the module's own tools must list every verb the seat promises, which is how a module named like its seat says they are one and the same. Registration refuses a claim naming a verb the seat never promised, and the credential's claims carry the claim's own verbs to the runtime.