get_usage and get_limits are reads. They do not send a message or change the account. Call them before a large broadcast, a new Flow, or a template, so the assistant can tell you when a field or a feature will be rejected.
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What the assistant calls
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Read usage and limits
get_api_key confirms the key and the account timezone. get_usage returns usage for messages, AI tokens, automations, Flows, and bots. get_limits returns the field limits the assistant must respect before it writes template, workflow, Flow, bot, catalog, or message text.2
Stop on plan errors
PLAN_EXPIRED means the plan is expired. FEATURE_NOT_INCLUDED means this plan does not include that tool. The assistant does not retry PLAN_EXPIRED until you renew on Manage Plan.