Google Calendar

Drive Google Calendar via curl + jq. The user's OAuth bearer token is in $GOOGLE_CALENDAR_TOKEN; every call needs it as Authorization: Bearer $GOOGLE_CALENDAR_TOKEN. At minimum the token carries calendar.readonly plus the identity scopes (openid email profile); if the user opted in to write at install time it also carries the broader calendar scope (read + write).

The Calendar API returns standard JSON; failures surface as {"error": {"code": 401|403|..., "message": "..."}} — show that error verbatim. 401 means the token expired (re-install). 403 insufficientPermissions on a write means the user only granted calendar.readonly — ask them to re-install the connector with the read+write box checked.

Always start with users/me/calendarList to learn which calendars the account can see (the user's primary plus any subscribed / shared ones), AND with users/me/settings/timezone so you render times in the user's local zone instead of UTC.

Before any destructive write (creating, moving, or cancelling an event that has attendees) show the exact event details and ask the user to confirm. When attendees are involved, also confirm whether they want Google to email the attendees — that's controlled by the sendUpdates query parameter.

Optional: Google Workspace CLI (gws) for agenda + create

gws is Google's official CLI (not officially supported — community-maintained on the googleworkspace org). It dynamically builds its command surface from Google's Discovery Document, exits non-zero on API errors, and ships hand-crafted helper commands (prefixed +) for time-aware workflows.

Use gws for two specific cases:

• +agenda reads the user's account timezone from Settings.timezone (cached for 24 h) and renders today's events in that zone, so you don't have to fetch the timezone yourself before formatting times.
• +insert shapes the create-event JSON for you (attendees, sendUpdates, reminders) so a one-line invocation produces a well-formed request.

For everything else (events.list / patch / move / delete, freebusy, calendarList) the curl recipes below are equivalent and shorter — stay on those.

Install

npm install -g @googleworkspace/cli   # or: brew install googleworkspace-cli
# Pre-built binaries also at https://github.com/googleworkspace/cli/releases
gws --version

Auth

gws reads its OAuth bearer token from the GOOGLE_WORKSPACE_CLI_TOKEN environment variable. The Calendar token used in this skill is in $GOOGLE_CALENDAR_TOKEN, so re-export it once at the top of every shell block that calls gws:

export GOOGLE_WORKSPACE_CLI_TOKEN="$GOOGLE_CALENDAR_TOKEN"

Agenda + create

# Today on the primary calendar, in the account's own timezone
gws calendar +agenda

# Today / week, with explicit overrides
gws calendar +agenda --today --tz America/New_York
gws calendar +agenda --range week

# Create an event (auto-shapes attendees + sendUpdates JSON)
gws calendar +insert --calendar primary \
  --json '{
    "summary":"Standup",
    "start":{"dateTime":"2026-05-06T10:00:00-04:00"},
    "end":  {"dateTime":"2026-05-06T10:30:00-04:00"},
    "attendees":[{"email":"alice@example.com"}]
  }' \
  --params '{"sendUpdates":"all"}'

Both helpers exit non-zero with a structured JSON error on stderr if Google rejects the request — surface that verbatim. +insert against attendees requires the broader calendar scope; on 403 insufficientPermissions ask the user to re-install with read+write checked.

Recipes

Verify auth + discover calendars (always run first)

# Account confirmation + calendars the user can read
curl -sS -H "Authorization: Bearer $GOOGLE_CALENDAR_TOKEN" \
  "https://www.googleapis.com/calendar/v3/users/me/calendarList" \
  | jq '.items[] | {id, summary, primary, accessRole, timeZone}'

# User's preferred display zone (use this when formatting times)
curl -sS -H "Authorization: Bearer $GOOGLE_CALENDAR_TOKEN" \
  "https://www.googleapis.com/calendar/v3/users/me/settings/timezone" \
  | jq -r .value

The id of each calendar (primary, or an email-shaped id like team-monday@group.calendar.google.com) is what subsequent calendars/{id}/events calls take.

Today's agenda on the primary calendar

TZ=$(curl -sS -H "Authorization: Bearer $GOOGLE_CALENDAR_TOKEN" \
  "https://www.googleapis.com/calendar/v3/users/me/settings/timezone" | jq -r .value)
TODAY=$(TZ=$TZ date +%Y-%m-%d)
START="${TODAY}T00:00:00Z"
END="${TODAY}T23:59:59Z"

curl -sS -H "Authorization: Bearer $GOOGLE_CALENDAR_TOKEN" \
  --get "https://www.googleapis.com/calendar/v3/calendars/primary/events" \
  --data-urlencode "timeMin=$START" \
  --data-urlencode "timeMax=$END" \
  --data-urlencode 'singleEvents=true' \
  --data-urlencode 'orderBy=startTime' \
  --data-urlencode "timeZone=$TZ" \
  | jq '.items[] | {summary, start: (.start.dateTime // .start.date), end: (.end.dateTime // .end.date), location, attendees: [.attendees[]?.email], hangout: .hangoutLink, status, htmlLink}'

singleEvents=true flattens recurring meetings into individual instances — almost always what you want for an agenda. Without it, you'd get the recurrence rule once and have to expand it client-side.

This week's meetings (Mon–Sun)

TZ=$(curl -sS -H "Authorization: Bearer $GOOGLE_CALENDAR_TOKEN" \
  "https://www.googleapis.com/calendar/v3/users/me/settings/timezone" | jq -r .value)
# Bash date math: Monday-of-this-week
MON=$(TZ=$TZ date -d "$(TZ=$TZ date +%Y-%m-%d) -$(($(TZ=$TZ date +%u) - 1)) days" +%Y-%m-%d 2>/dev/null \
  || TZ=$TZ date -v-mondayw +%Y-%m-%d)  # macOS fallback
SUN=$(TZ=$TZ date -d "$MON +6 days" +%Y-%m-%d 2>/dev/null \
  || TZ=$TZ date -v+6d -j -f %Y-%m-%d "$MON" +%Y-%m-%d)

curl -sS -H "Authorization: Bearer $GOOGLE_CALENDAR_TOKEN" \
  --get "https://www.googleapis.com/calendar/v3/calendars/primary/events" \
  --data-urlencode "timeMin=${MON}T00:00:00Z" \
  --data-urlencode "timeMax=${SUN}T23:59:59Z" \
  --data-urlencode 'singleEvents=true' \
  --data-urlencode 'orderBy=startTime' \
  | jq -r '.items[] | "\(.start.dateTime // .start.date)\t\(.summary)\t\((.attendees // []) | length) attendees"'

Search events by query

Q='quarterly review'
curl -sS -H "Authorization: Bearer $GOOGLE_CALENDAR_TOKEN" \
  --get "https://www.googleapis.com/calendar/v3/calendars/primary/events" \
  --data-urlencode "q=$Q" \
  --data-urlencode 'singleEvents=true' \
  --data-urlencode 'maxResults=20' \
  | jq '.items[] | {start: .start.dateTime, summary, htmlLink}'

q matches against summary, description, location, attendee emails, and creator/organizer.

Get one event's full details (incl. attendees, location, link)

EVENT_ID='abc123def4567890ghijklmnop'
curl -sS -H "Authorization: Bearer $GOOGLE_CALENDAR_TOKEN" \
  "https://www.googleapis.com/calendar/v3/calendars/primary/events/$EVENT_ID" \
  | jq '{summary, start, end, location, description, attendees, organizer, hangoutLink, conferenceData}'

Free / busy across multiple calendars (next 7 days)

TZ=$(curl -sS -H "Authorization: Bearer $GOOGLE_CALENDAR_TOKEN" \
  "https://www.googleapis.com/calendar/v3/users/me/settings/timezone" | jq -r .value)
NOW=$(TZ=$TZ date -u +%Y-%m-%dT%H:%M:%SZ)
NEXT_WEEK=$(TZ=$TZ date -u -d "+7 days" +%Y-%m-%dT%H:%M:%SZ 2>/dev/null \
  || TZ=$TZ date -u -v+7d +%Y-%m-%dT%H:%M:%SZ)

cat > /tmp/freebusy.json <<JSON
{
  "timeMin": "$NOW",
  "timeMax": "$NEXT_WEEK",
  "timeZone": "$TZ",
  "items": [
    {"id": "primary"},
    {"id": "team-monday@group.calendar.google.com"}
  ]
}
JSON

curl -sS -X POST -H "Authorization: Bearer $GOOGLE_CALENDAR_TOKEN" \
  -H 'Content-Type: application/json' \
  --data @/tmp/freebusy.json \
  "https://www.googleapis.com/calendar/v3/freeBusy" \
  | jq '.calendars'

Each calendar's response is {"busy": [{"start": "...", "end": "..."}]} — gaps between are free.

List events on a non-primary calendar

CAL_ID='team-monday@group.calendar.google.com'
# URL-encode the @ in the path
CAL_ENCODED=$(printf %s "$CAL_ID" | jq -sRr @uri)
curl -sS -H "Authorization: Bearer $GOOGLE_CALENDAR_TOKEN" \
  --get "https://www.googleapis.com/calendar/v3/calendars/$CAL_ENCODED/events" \
  --data-urlencode 'singleEvents=true' \
  --data-urlencode 'orderBy=startTime' \
  --data-urlencode 'maxResults=20' \
  | jq '.items[] | {start: .start.dateTime, summary}'

Pagination

PAGE_TOKEN=''
while : ; do
  RESP=$(curl -sS -H "Authorization: Bearer $GOOGLE_CALENDAR_TOKEN" \
    --get "https://www.googleapis.com/calendar/v3/calendars/primary/events" \
    --data-urlencode 'singleEvents=true' \
    --data-urlencode 'orderBy=startTime' \
    --data-urlencode 'maxResults=250' \
    ${PAGE_TOKEN:+--data-urlencode "pageToken=$PAGE_TOKEN"})
  echo "$RESP" | jq -c '.items[]?'
  PAGE_TOKEN=$(echo "$RESP" | jq -r '.nextPageToken // empty')
  [ -z "$PAGE_TOKEN" ] && break
done

Write recipes

These all need the broader calendar scope. If the user only granted calendar.readonly you'll get 403 insufficientPermissions — surface that and ask them to re-install with the read+write box checked. Always echo the event summary, time and attendee list back to the user before creating or cancelling anything.

Create a single event (with optional attendees + Google Meet link)

TZ=$(curl -sS -H "Authorization: Bearer $GOOGLE_CALENDAR_TOKEN" \
  "https://www.googleapis.com/calendar/v3/users/me/settings/timezone" | jq -r .value)

cat > /tmp/_cal_event.json <<JSON
{
  "summary": "Sync — Q2 OKR review",
  "location": "Online",
  "description": "Drafted by AceDataCloud.",
  "start": {"dateTime": "2026-05-12T10:00:00", "timeZone": "$TZ"},
  "end":   {"dateTime": "2026-05-12T10:30:00", "timeZone": "$TZ"},
  "attendees": [
    {"email": "alice@example.com"},
    {"email": "bob@example.com"}
  ],
  "reminders": {"useDefault": true},
  "conferenceData": {
    "createRequest": {
      "requestId": "meet-$(date +%s)",
      "conferenceSolutionKey": {"type": "hangoutsMeet"}
    }
  }
}
JSON

# sendUpdates: 'all' = email all attendees; 'externalOnly' = only non-org; 'none' = silent
curl -sS -X POST -H "Authorization: Bearer $GOOGLE_CALENDAR_TOKEN" \
  -H 'Content-Type: application/json' \
  --data @/tmp/_cal_event.json \
  "https://www.googleapis.com/calendar/v3/calendars/primary/events?conferenceDataVersion=1&sendUpdates=all" \
  | jq '{id, htmlLink, hangoutLink, summary, start, end, attendees}'

Drop the conferenceData block if the user didn't ask for a Meet link — it'll fall back to a plain event.

Create a recurring event

TZ=$(curl -sS -H "Authorization: Bearer $GOOGLE_CALENDAR_TOKEN" \
  "https://www.googleapis.com/calendar/v3/users/me/settings/timezone" | jq -r .value)
cat > /tmp/_cal_recur.json <<JSON
{
  "summary": "Weekly 1:1",
  "start": {"dateTime": "2026-05-12T15:00:00", "timeZone": "$TZ"},
  "end":   {"dateTime": "2026-05-12T15:30:00", "timeZone": "$TZ"},
  "recurrence": ["RRULE:FREQ=WEEKLY;BYDAY=TU;COUNT=12"]
}
JSON
curl -sS -X POST -H "Authorization: Bearer $GOOGLE_CALENDAR_TOKEN" \
  -H 'Content-Type: application/json' \
  --data @/tmp/_cal_recur.json \
  "https://www.googleapis.com/calendar/v3/calendars/primary/events" \
  | jq '{id, recurrence, summary}'

RRULE follows RFC 5545. Common patterns: FREQ=DAILY, FREQ=WEEKLY;BYDAY=MO,WE,FR, FREQ=MONTHLY;BYMONTHDAY=15. Add UNTIL=20261231T235959Z or COUNT=12 for a hard stop.

Update an existing event (PATCH — partial update)

EVENT_ID='abc123def4567890ghijklmnop'
curl -sS -X PATCH -H "Authorization: Bearer $GOOGLE_CALENDAR_TOKEN" \
  -H 'Content-Type: application/json' \
  --data '{"location":"Conference Room 4","description":"Now in-person."}' \
  "https://www.googleapis.com/calendar/v3/calendars/primary/events/$EVENT_ID?sendUpdates=all" \
  | jq '{id, summary, location, description}'

PATCH only changes the fields you send; PUT replaces the entire event payload. Prefer PATCH.

Reschedule an event

EVENT_ID='abc123def4567890ghijklmnop'
TZ=$(curl -sS -H "Authorization: Bearer $GOOGLE_CALENDAR_TOKEN" \
  "https://www.googleapis.com/calendar/v3/users/me/settings/timezone" | jq -r .value)
cat > /tmp/_cal_resched.json <<JSON
{
  "start": {"dateTime": "2026-05-12T14:00:00", "timeZone": "$TZ"},
  "end":   {"dateTime": "2026-05-12T14:30:00", "timeZone": "$TZ"}
}
JSON
curl -sS -X PATCH -H "Authorization: Bearer $GOOGLE_CALENDAR_TOKEN" \
  -H 'Content-Type: application/json' \
  --data @/tmp/_cal_resched.json \
  "https://www.googleapis.com/calendar/v3/calendars/primary/events/$EVENT_ID?sendUpdates=all" \
  | jq '{id, summary, start, end}'

Add or change attendees

Google requires you to send the complete attendee list when patching attendees — fetch the current list, mutate, send back:

EVENT_ID='abc123def4567890ghijklmnop'
CURRENT=$(curl -sS -H "Authorization: Bearer $GOOGLE_CALENDAR_TOKEN" \
  "https://www.googleapis.com/calendar/v3/calendars/primary/events/$EVENT_ID?fields=attendees" \
  | jq '.attendees // []')
NEW=$(echo "$CURRENT" | jq '. + [{"email":"carol@example.com"}]')
curl -sS -X PATCH -H "Authorization: Bearer $GOOGLE_CALENDAR_TOKEN" \
  -H 'Content-Type: application/json' \
  --data "{\"attendees\": $NEW}" \
  "https://www.googleapis.com/calendar/v3/calendars/primary/events/$EVENT_ID?sendUpdates=all" \
  | jq '{id, attendees}'

Cancel / delete an event

EVENT_ID='abc123def4567890ghijklmnop'
curl -sS -X DELETE -H "Authorization: Bearer $GOOGLE_CALENDAR_TOKEN" \
  "https://www.googleapis.com/calendar/v3/calendars/primary/events/$EVENT_ID?sendUpdates=all" \
  -o /dev/null -w 'HTTP %{http_code}\n'

204 = success. To cancel one occurrence of a recurring event, fetch the instance with events.instances first, then DELETE the specific instance id (it has a longer EVENT_ID_YYYYMMDDTHHMMSSZ shape).

Common error codes

Never log or echo $GOOGLE_CALENDAR_TOKEN — treat it as a secret.