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Rate limits
Put an hourly limit on any tool to keep a busy assistant in check.
Expand an app on the Apps tab, open a tool's settings and choose a limit under Calls per hour. When the limit is reached, the tool answers "Rate limit reached" with the minutes left until the hour turns, and works again after that.
During the free trial each connector also has a ceiling of 600 calls an hour, to stop runaway loops and abuse. It goes away when you choose a plan.
Monthly call allowances on a plan are soft: they show a banner and never stop a call. See Plans and trial.