Scored across 29 tools
Most tools have clearly distinct purposes, and descriptions include explicit USE WHEN / DO NOT USE guidance that resolves most boundaries. Redundancy remains at the edges: list_unsubscribe vs unsubscribe vs bulk_unsubscribe and modify_labels vs bulk_modify vs archive/mark_read can be confused despite the notes.
Strong, mostly consistent verb_noun convention (list_subscriptions, get_thread, create_label, delete_filter, mark_read). A few names lack verbs (snooze, archive, trash, search, what_changed, follow_ups), which is a minor deviation from the pattern but still readable.
29 tools exceeds the comfortable scoped range; a Gmail server needs many but this surface is heavy, with dedicated single-purpose tools (archive, mark_read, mark_unread, trash, untrash) that overlap with modify_labels and bulk_modify.
Coverage is broad across read, search, bulk modify, unsubscribe, snooze, attachments, filters and history, with only send/drafts and a few edge operations missing (by design). Minor gaps an agent can work around.