[nijave]

Not sure if it qualifies as "swarm" but they're useful for controlling context size. You can spin them off for context heavy things like research and analysis then only a much shorter summary gets passed back into the main context.

For instance, I was troubleshooting a 3rd party library issue and I spun a few off "check issue tracker for x", "check rust implementation for x", "check go implementation for x", "check Ruby implementation for x" to compare how different languages did or didn't handle http/2 for a service. They each returned a sentence or two worth of data to the main agent but consumed much more tokens in the process grepping code.