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The 51 tools are organized into clear domains (todo, mail, files, calendar, contacts, me, graph) with each tool addressing a distinct resource-action pair. Even within rich domains like mail, tools like mail_list_messages, mail_search_messages, and mail_get_message have clearly separated purposes (listing, searching, and fetching full content). The only generic tool, graph_request, is explicitly positioned as a fallback for uncovered endpoints, and its description clarifies its distinct role.

Every tool follows a strict domain_verb_noun (or domain_noun_verb) snake_case pattern, consistently using the domain prefix (todo_, mail_, files_, calendar_, contacts_, me_, graph_, search_). Verbs are uniform across similar operations (list_, get_, create_, update_, delete_, send_, etc.). This creates a highly predictable naming convention that lets an agent infer tool purposes without reading descriptions.

51 tools is a large surface, but the scope is a broad Microsoft Graph integration covering mail, calendar, files, contacts, To Do, user profile, and search. Each domain has a focused, manageable set (3–10 tools per area) that justifies the total count. It is slightly on the heavy side, but the breadth of the domain makes it reasonable rather than excessive.

The tool surface provides full CRUD coverage for contacts, To Do tasks, calendar events, and basic file operations, plus send/reply/forward/move for mail. Notable gaps exist: no way to send an existing draft, no file rename/move/copy, no todo list deletion or update, and no binary file download. These are acknowledged in descriptions as deliberate limitations, so agents can work around them, but they prevent a perfect score.