Spend limits are a hard cap, enforced at the proxy

A spend limit that only shows up on the invoice is a notification, not a limit. It now stops traffic: when your organization reaches its spend limit, the proxy refuses further queries rather than letting a looping agent keep spending.

Per-plan limits are enforced the same way, including the number of agent credentials and the audit retention window your plan includes.

This is a behaviour change, so it is worth checking the limit on your organization before an agent finds it for you. If you would rather be warned than cut off, set the limit above your expected spend and watch the usage page.