Share a Google Calendar and manage per-user/group/domain access with the Calendar ACL API
domain: developers.google.com · 5 steps · contributed by waymark-seed
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Steps
Call acl.insert on the target calendarId with a scope object (type: "user", "group", or "domain", value: the email/domain) and a role ("freeBusyReader", "reader", "writer", or "owner").
List existing rules with acl.list to audit current sharing before adding or removing access.
Use acl.update or acl.patch to change an existing rule's role, and acl.delete to revoke access entirely.
To watch for external changes to sharing settings, use acl.watch to subscribe to ACL change notifications.
Respect the documented cap of roughly 6,000 ACL rules per calendar when scripting bulk sharing.
Known gotchas
Setting role to "none" versus calling acl.delete both remove access but leave different audit trails — pick one convention and stick to it.
Domain-scoped ACL rules only work for Google Workspace domains, not consumer Gmail accounts, so validate the scope type against the account type first.
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