That's a great idea, it makes a lot of sense for dynamic use cases.

I suppose I'm thinking of it as a more elegant way of doing something equivalent to top-down agent routing, where the top agent routes to 2-legged agents.

I'd be interested to hear more about how you handle the provenance tracking in practice, especially when the agent chains multiple data sources together. I think my question would be: what's the practical difference between dynamic attenuation and just statically removing the third leg upfront? Is it "just" a more elegant solution, or are there other advantages that I'm missing?