What a 500-script migration taught me about when agent parallelism actually makes sense

I recently started working on a migration involving roughly 500 scripts.

The goal was to migrate legacy logging calls to a newly implemented structured logging engine, with unique logging channels for tracing and observability through Grafana, Loki, Tempo, and Alloy. The new logging engine was already implemented and available through a common include path.

What remained was the tedious part: updating hundreds of existing scripts.

My first thought was simple: