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Create, update, delete, and query Google Calendar events using gcallm CLI, MCP tools, or direct API calls.
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| name | Google Calendar Management |
| description | Create, update, delete, and query Google Calendar events using gcallm CLI, MCP tools, or direct API calls. |
Three access methods, in order of preference:
Best for creating events from natural language or file input.
# Direct text
gcallm "Meeting with Sarah tomorrow at 3pm"
# From file (preferred for multi-event)
cat /tmp/gcal/events.txt | gcallm
# From clipboard
gcallm
# From screenshot
gcallm -s "Add events from this screenshot"
# Ask questions
gcallm ask "What's on my calendar today?"
gcallm ask "Am I free Thursday afternoon?"
When the google-calendar MCP server is connected, these tools are available:
mcp__google-calendar__list-events # List events in a time range
mcp__google-calendar__search-events # Search by query string
mcp__google-calendar__create-event # Create event
mcp__google-calendar__update-event # Update event (supports recurring with modificationScope)
mcp__google-calendar__delete-event # Delete event
Use modificationScope to control which instances are affected:
all — update/delete the entire seriesthis — only this instancethisAndFollowing — this and all future instances| ID | Color |
|---|---|
| 1 | Lavender |
| 2 | Sage |
| 3 | Grape |
| 4 | Flamingo |
| 5 | Banana |
| 6 | Tangerine |
| 7 | Peacock |
| 8 | Graphite |
| 9 | Blueberry |
| 10 | Basil |
| 11 | Tomato (Red) |
When MCP tools are unavailable, use the REST API with stored OAuth tokens.
/Users/wz/.config/google-calendar-mcp/tokens.json
TOKEN=$(python3 -c "import json; print(json.load(open('/Users/wz/.config/google-calendar-mcp/tokens.json'))['normal']['access_token'])")
# List events
curl -s -H "Authorization: Bearer $TOKEN" \
"https://www.googleapis.com/calendar/v3/calendars/primary/events?timeMin=2026-01-01T00:00:00Z&timeMax=2026-12-31T23:59:59Z&singleEvents=true"
# Search events
curl -s -H "Authorization: Bearer $TOKEN" \
"https://www.googleapis.com/calendar/v3/calendars/primary/events?q=SEARCH_TERM&timeMin=...&timeMax=...&singleEvents=true"
# Create event
curl -s -X POST -H "Authorization: Bearer $TOKEN" -H "Content-Type: application/json" \
"https://www.googleapis.com/calendar/v3/calendars/primary/events" \
-d '{"summary":"Event Title","location":"Place","colorId":"11","start":{"dateTime":"2026-02-03T09:00:00","timeZone":"America/New_York"},"end":{"dateTime":"2026-02-03T10:00:00","timeZone":"America/New_York"},"recurrence":["RRULE:FREQ=WEEKLY;COUNT=16;BYDAY=TU"]}'
# Update event (single instance)
curl -s -X PATCH -H "Authorization: Bearer $TOKEN" -H "Content-Type: application/json" \
"https://www.googleapis.com/calendar/v3/calendars/primary/events/EVENT_ID" \
-d '{"colorId":"11"}'
# Delete event (entire recurring series — use base recurring event ID, no instance suffix)
curl -s -X DELETE -H "Authorization: Bearer $TOKEN" \
"https://www.googleapis.com/calendar/v3/calendars/primary/events/RECURRING_EVENT_ID"
# Delete single instance
curl -s -X DELETE -H "Authorization: Bearer $TOKEN" \
"https://www.googleapis.com/calendar/v3/calendars/primary/events/EVENT_ID_WITH_INSTANCE_SUFFIX"
abc123 — represents the seriesabc123_20260203T140000Z — represents one occurrencerecurringEventId pointing back to the baseRRULE:FREQ=WEEKLY;COUNT=16;BYDAY=TU # Every Tuesday for 16 weeks
RRULE:FREQ=WEEKLY;COUNT=16;BYDAY=MO,WE # Mon & Wed for 16 weeks
RRULE:FREQ=WEEKLY;COUNT=16;BYDAY=TU,TH # Tue & Thu for 16 weeks
RRULE:FREQ=DAILY;COUNT=5 # Daily for 5 days
RRULE:FREQ=WEEKLY;UNTIL=20260530T000000Z # Weekly until date
| Code | Meaning |
|---|---|
| 200 | Success (GET/PATCH) |
| 204 | Success (DELETE) |
| 401 | Token expired — need to refresh or re-auth via MCP server |
| 404 | Event not found |
| 409 | Conflict (duplicate) |
wzhu@college.harvard.eduAmerica/New_Yorkprimary