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Scored across 26 tools
Most tools have clearly distinct resource+action targets, and the descriptions explicitly cross-reference related tools (e.g. block_sender/delete_rule, get_unsubscribe_info/unsubscribe, delete_message/bulk_action). The main soft overlaps are the single-message mutators (mark_read, flag_message, move_message, delete_message) versus bulk_action, which applies the same actions to a search result set, plus find_newsletters/mail_digest both surfacing newsletter hints; descriptions mitigate these but an agent could still pick the wrong one at the edges.
The set is uniformly snake_case and overwhelmingly verb_noun (list_messages, search_messages, get_message, send_mail, move_message, create_rule), which makes intent predictable. A handful of deviations exist (auth_status, logout, bulk_action, mail_digest) that are noun-first or verb-less, but they are few and still readable.
At 26 tools this is on the heavy side for a mail client, though the surface is broad (messages, attachments, auth, folders, rules, bulk ops, unsubscribe, digests), so few tools feel truly redundant. The auth trio (login/logout/auth_status) and the unsubscribe trio (get_unsubscribe_info/unsubscribe/find_newsletters) push it past a lean, well-scoped set.
Core lifecycle is well covered: read/search, send, draft, reply, forward, move, flag, read-state, delete (soft and permanent), attachments, folders, rules, and bulk operations. Notable gaps are no way to send or edit an existing draft (create_draft has no companion send_draft/update_draft) and no folder create/rename/delete, but agents can work around these via send_mail and existing well-known folders.