My AI agents YouTube Shorts pipeline died at 3am - Python 3.14 + moviepy v2 was the killer

I run an autonomous agent (Atlas) that generates and uploads a YouTube Short every day. For 37 days it worked. On day 38 it just stopped. No alarms. No exception bubbled up to a dashboard. The Short never appeared.

When I dug in, the root cause was the most mundane possible: a quiet language upgrade collided with a library that had renamed its import path between major versions.

Here is the post-mortem, because if you are running anything long-lived in Python you are probably one brew upgrade away from the same trap.

The failure mode

My pipeline lives in tools/create_short_v2.py .…