Each tool targets a distinct concept: server inventory, message search, single-message drill-down, bounce search, suppression lists, and aggregate stats. The descriptions explicitly route between search_messages and get_message_details, though search_bounces vs list_suppressions could be momentarily confused since both relate to failed delivery and the distinction (events vs suppressed addresses) must be inferred.

Five of six tools follow a clean verb_noun snake_case pattern (list_servers, search_messages, get_message_details, search_bounces, list_suppressions). delivery_stats breaks the pattern as a bare noun phrase, a minor deviation that is still readable in context.

Six tools is well within the sweet spot for a focused read-only account/message observability server. Each tool covers a distinct facet (inventory, search, detail, bounces, suppressions, stats) with no filler.

The surface covers the core read workflows end-to-end: find servers, search and drill into messages, inspect bounces and suppressions, and roll up stats. Gaps exist but are minor for a read-only account server — no inbound message search, no way to fetch a single bounce or suppression record, and no suppression management (e.g. reactivating an address).