Ask HN: How do you do multi-agent workflows with web apps?

I'd like to try out multi agent workflows - sometimes I get a good flow where I can get one agent to be pretty independent for work where I know what needs to be done but needs a lot of code. It spins for a while, then I need to verify in the browser that it actually works and iterate/debug from there. Or I have 3 different approaches I want to try, and I can have the AI just do 1 and see if it works well with the front end and quickly roll back if not.

I'd like to be able to work on another agent while it's spinning, otherwise I just sit there and wait.

The issue is our env doesn't really allow multiple instances of our app to run simultaneously - our front end is heavy and takes a ton of memory so even if we figure out how to run multiple backends, RAM would be an issue.

It seems a lot of multi agent workflows use CLI tools - which makes sense. Anyone find success with web? Maybe some browser automation too?