I've build adaptive agent swarms using email, mailing lists and ftp servers.

If you don't need to have the lowest possible latency for your work and you're happy to have threads die then it's better than any bespoke solution you can build without an army of engineers to keep it chugging along.

What's even better is that you can see all the context, and use the same command plane as the agents to tell them what they are doing wrong.