Castle MCP by usefulapi MCP Tools

Castle MCP by usefulapi exposes 14 tools. Each one has its own page with the configuration for every client that can run this server.

castle_get_events_schema

castle get events schema
castle_search_events

castle search events
castle_group_events

castle group events
castle_search_lists

castle search lists
castle_get_list

castle get list
castle_search_list_items

castle search list items
castle_count_list_items

castle count list items
castle_get_list_item

castle get list item
castle_create_list

castle create list
castle_update_list

castle update list
castle_create_list_item

castle create list item
castle_update_list_item

castle update list item
castle_archive_list_item

castle archive list item
castle_unarchive_list_item

castle unarchive list item

This list was read from the server itself, by connecting to it and calling tools/list on 5 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.

Castle MCP by usefulapi MCP server