Email Sending MCP
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TDQS
Scored across 136 tools
Despite 136 tools, nearly every description carries explicit 'NOT for' cross-references that steer the agent away from near-neighbors (send-email vs send-batch-emails vs send-new-inbox-email; list-inbox-threads vs search-inbox-threads vs list-inbox-thread-emails; compose vs update variants). A few boundaries still blur—especially the create/send/duplicate/cancel broadcast cluster and the many overlapping list tools—but the set is unusually well-disambiguated for its size.
Overwhelmingly consistent snake_case verb_noun (list-contacts, create-broadcast, remove-webhook, add-inbox-thread-labels). Minor deviations exist: compound multi-action tools like manage-events and dual-mode tools like get-automation/get-usage, plus connect-to-editor/disconnect-from-editor. Pattern is still highly predictable.
136 tools is far past the heavy threshold, even for a platform as broad as Resend. While each tool maps to a distinct API endpoint and the domain is genuinely large, the sheer surface imposes heavy selection cost and context load on an agent. This is over-scoped for practical agent use.
Coverage is excellent—full CRUD across contacts, domains, broadcasts, templates, topics, segments, webhooks, API keys, inboxes, threads, labels, drafts, suppressions, automations, and events, plus logs, metrics, and usage. The main dead end is attachments: they can be listed but their contents cannot be downloaded through this server.