Retainful MCP by usefulapi MCP Tools
Retainful MCP by usefulapi exposes 7 tools. Each one has its own page with the configuration for every client that can run this server.
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retainful_list_contactsretainful list contacts
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retainful_get_contactretainful get contact
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retainful_list_listsretainful list lists
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retainful_get_listretainful get list
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retainful_upsert_contactretainful upsert contact
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retainful_add_contact_to_listretainful add contact to list
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retainful_track_eventretainful track event
This list was read from the server itself, by connecting to it and calling tools/list on 11 November 2026. It is what
the server actually exposes, not what its listing claims.
Mutating and Read-only are read off each tool's name, not its schema — a hint, not a guarantee. The registry stores tool names only; connect the server for its live schemas.