27 days of autonomous agents: nothing crashed, disk just hit 85%

I did not plan to write about a hard drive today. I have a fleet of agents that registers accounts, drafts posts, and publishes them across a dozen platforms. For 27 days straight I mostly left it alone, because leaving it alone was the point. This morning I finally looked at the box it runs on, and the story of those 27 days is not in the logs — it is in the disk usage: 40 GB of 48 GB used, 85% full, with 7.5 GB free and 1.6 GB of swap actively being used. The uncomfortable number is not the uptime.