Google Calendar Skill

Overview

This skill provides a thin wrapper around the Google Calendar REST API. It lets you:

• list upcoming events (optionally filtered by time range or query)
• add a new event with title, start/end time, description, location, and attendees
• update an existing event by its ID
• delete an event by its ID

The skill is implemented in Python (scripts/google_calendar.py). It expects the following environment variables to be set:

GOOGLE_CLIENT_ID=…
GOOGLE_CLIENT_SECRET=…
GOOGLE_REFRESH_TOKEN=…       # obtained after OAuth consent
GOOGLE_ACCESS_TOKEN=…        # short-lived, auto-refreshed
GOOGLE_CALENDAR_IDS=…        # comma-separated list of calendar IDs

Credential Storage (on this system): Credentials are stored in ~/.config/google-calendar/secrets.env as environment variable exports. To use them:

source ~/.config/google-calendar/secrets.env
# Or: export $(grep -v '^#' ~/.config/google-calendar/secrets.env | xargs)

The GOOGLE_ACCESS_TOKEN expires every ~1 hour. The skill will need to refresh it using the GOOGLE_REFRESH_TOKEN if expired.

Commands

google-calendar list [--from <ISO> --to <ISO> --max <N>]
google-calendar add   --title <title> [--start <ISO> --end <ISO>]
                     [--desc <description> --location <loc> --attendees <email1,email2>]
google-calendar update --event-id <id> [--title <title> ... other fields]
google-calendar delete --event-id <id>

All commands return a JSON payload printed to stdout. Errors are printed to stderr and cause a non‑zero exit code.

Setup

1. Create a Google Cloud project and enable the Google Calendar API.
2. Create OAuth credentials (type Desktop app). Note the client_id and client_secret.
3. Run the helper script to obtain a refresh token:

   GOOGLE_CLIENT_ID=… GOOGLE_CLIENT_SECRET=… python3 -m google_calendar.auth
   

   It will open a browser (or print a URL you can open elsewhere) and ask you to grant access. After you approve, copy the refresh_token it prints.
4. Store the credentials securely:

   openclaw secret set GOOGLE_CLIENT_ID <value>
   openclaw secret set GOOGLE_CLIENT_SECRET <value>
   openclaw secret set GOOGLE_REFRESH_TOKEN <value>
   openclaw secret set GOOGLE_CALENDAR_ID primary   # optional
   

5. Install the required Python packages (once):

   pip install --user google-auth google-auth-oauthlib google-api-python-client
   

How it works (brief)

The script loads the credentials from the environment, refreshes the access token using the refresh token, builds a service = build('calendar', 'v3', credentials=creds), and then calls the appropriate API method.

References

• Google Calendar API reference: https://developers.google.com/calendar/api/v3/reference
• OAuth 2.0 for installed apps: https://developers.google.com/identity/protocols/oauth2/native-app

Note: This skill does not require a GUI; it works entirely via HTTP calls, so it is suitable for headless servers.