Comment by verdverm

I think in ADK, the most likely place to find them actually used is the Workflow agent interfaces (sequential, parallel, loop). Perhaps looping, where it looks like they suggest you have an agent that determines if the loop is done and escalates with that message to the Looper.

https://google.github.io/adk-docs/agents/workflow-agents/

I haven't gotten there yet, still building out the basics like showing diffs instead of blind writing and supporting rewind in a session