Ics Expand Rrule MCP tool
findutils:ics_expand_rrule Expand the recurring events of an iCalendar (.ics) file into one concrete event per occurrence between two dates, for a spreadsheet, a CRM or an importer that cannot read RRULE. Supports FREQ=DAILY, WEEKLY, MONTHLY and YEARLY with INTERVAL, COUNT, UNTIL, BYDAY (ordinals such as 2TU or -1FR included), BYMONTHDAY, BYMONTH and WKST, plus EXDATE, RDATE and RECURRENCE-ID overrides. A rule with BYSETPOS, BYYEARDAY, BYWEEKNO, BYHOUR, BYMINUTE, BYSECOND or an HOURLY or finer frequency keeps its first occurrence only and is named in notes. Each series stops at max_occurrences (default 366, at most 2000) and the output at 20000 events. Times are wall-clock as the file states them, never converted. Each occurrence gets its own UID (the series UID plus its start). Output is .ics, a JSON array in the ics_to_json shape, or CSV in the ics_to_csv spreadsheet columns. No calendar URL is fetched.
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Arguments
application/json-
input
string required
The .ics file contents.
-
from
string required
First day of the window, YYYY-MM-DD, inclusive, read in each event's own zone.
-
to
string required
Last day of the window, YYYY-MM-DD, inclusive.
-
max_occurrences
integer optional
Occurrences written per series at most. Default 366, at most 2000. A series with more in the window is cut and named in notes. Default
366. -
format
string optional
ics (default), json or csv. One of
ics · json · csv. Default"ics". -
skip_cancelled
boolean optional
Leave out STATUS:CANCELLED series, cancelled single occurrences and cancelled events. Default true. Default
true.
Example arguments
Verified{
"input": "BEGIN:VCALENDAR\nVERSION:2.0\nBEGIN:VEVENT\nUID:[email protected]\nDTSTART;TZID=Europe/Istanbul:20261005T093000\nDTEND;TZID=Europe/Istanbul:20261005T094500\nRRULE:FREQ=WEEKLY;BYDAY=MO;COUNT=4\nSUMMARY:Standup\nEND:VEVENT\nEND:VCALENDAR\n",
"from": "2026-10-01",
"to": "2026-12-31",
"format": "ics"
}More Productivity tools
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