Your plan defines limits such as: number of workflows and forms, monthly AI usage, platform tool calls, and (if applicable) server usage. Usage is tracked per billing period.
User tokens (or top-up tokens) are a unit of consumption. Running a workflow consumes tokens based on AI usage, platform calls, and other factors. If you hit a limit, you may need to upgrade or wait until the next period. Check Billing or your plan settings for exact numbers.