Your workspace has used $5.02 in Agent tokens this billing cycle, which hit the $5.00 default Hobby hard limit and triggered that email. Agent usage includes the dashboard AI chat, automatic deployment-failure diagnosis, and code-change suggestions. The automatic deployment diagnosis runs whenever a deploy fails, even without you explicitly opening the agent, which is likely where the usage came from. To disable it entirely, go to railway.com/workspace/usage, click "Update limits", and set the Agent hard limit to $0. You can set up usage alerts, limits, and view your usage breakdown by heading to railway.com/workspace/usage.