>Also, the examples provided are not only not practical but potentially bad practice. Why do you need a manager pattern to control a bunch of language translation agents when most models will do fine especially for latin-based languages? In practice a single LLM will not only be more cost-effective but also good for the overall user experience too.

Usually that's how these agent tutorials work. I don't think there any open sourced large scale agent applications that anyone has published online yet, especially those agent that hand off to other agent sort of apps.