Cancel at the end of the current period (terminal): the workspaces drawing from it lose their coverage then, are suspended and their data retention clock arms; no immediate charge or refund. DANGEROUS. There is no delete verb; cancel is the termination, undo_cancel_billing_subscription takes it back before the period ends. Owner only.

Contract:

• MCP tool cancel_billing_subscription, registry package mcp.id/billing_subscriptions, mount id.billing.
• Operation action, response envelope action.
• Flags: dangerous: the MCP layer gates it behind a preview/commit token, and the effect cannot be undone through this API.